387 lines
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<title>Coverage for pyPhotoAlbum/mixins/viewport.py: 97%</title>
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<span class="text">Coverage for </span><b>pyPhotoAlbum<span class="sep">/</span>mixins<span class="sep">/</span>viewport.py</b>:
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<span class="pc_cov">97%</span>
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<a class="nav" href="https://coverage.readthedocs.io/en/7.14.1">coverage.py v7.14.1</a>,
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<p class="pln"><span class="n"><a id="t1" href="#t1">1</a></span><span class="t"><span class="str">"""</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t2" href="#t2">2</a></span><span class="t"><span class="str">Viewport mixin for GLWidget - handles zoom and pan</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t3" href="#t3">3</a></span><span class="t"><span class="str">"""</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t4" href="#t4">4</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t5" href="#t5">5</a></span><span class="t"><span class="key">from</span> <span class="nam">pyPhotoAlbum</span><span class="op">.</span><span class="nam">gl_imports</span> <span class="key">import</span> <span class="op">*</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t6" href="#t6">6</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t7" href="#t7">7</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t8" href="#t8">8</a></span><span class="t"><span class="key">class</span> <span class="nam">ViewportMixin</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t9" href="#t9">9</a></span><span class="t"> <span class="str">"""</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t10" href="#t10">10</a></span><span class="t"><span class="str"> Mixin providing viewport zoom and pan functionality.</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t11" href="#t11">11</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t12" href="#t12">12</a></span><span class="t"><span class="str"> This mixin manages the zoom level and pan offset for the OpenGL canvas,</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t13" href="#t13">13</a></span><span class="t"><span class="str"> including fit-to-screen calculations and OpenGL initialization.</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t14" href="#t14">14</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t15" href="#t15">15</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t16" href="#t16">16</a></span><span class="t"> <span class="key">def</span> <span class="nam">__init__</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="op">*</span><span class="nam">args</span><span class="op">,</span> <span class="op">**</span><span class="nam">kwargs</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t17" href="#t17">17</a></span><span class="t"> <span class="nam">super</span><span class="op">(</span><span class="op">)</span><span class="op">.</span><span class="nam">__init__</span><span class="op">(</span><span class="op">*</span><span class="nam">args</span><span class="op">,</span> <span class="op">**</span><span class="nam">kwargs</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t18" href="#t18">18</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t19" href="#t19">19</a></span><span class="t"> <span class="com"># Zoom and pan state</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t20" href="#t20">20</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">zoom_level</span> <span class="op">=</span> <span class="num">1.0</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t21" href="#t21">21</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">pan_offset</span> <span class="op">=</span> <span class="op">[</span><span class="num">0</span><span class="op">,</span> <span class="num">0</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t22" href="#t22">22</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">initial_zoom_set</span> <span class="op">=</span> <span class="key">False</span> <span class="com"># Track if we've set initial fit-to-screen zoom</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t23" href="#t23">23</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t24" href="#t24">24</a></span><span class="t"> <span class="com"># Track previous viewport size to detect scrollbar-induced resizes</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t25" href="#t25">25</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">_last_viewport_size</span> <span class="op">=</span> <span class="op">(</span><span class="num">0</span><span class="op">,</span> <span class="num">0</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t26" href="#t26">26</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t27" href="#t27">27</a></span><span class="t"> <span class="key">def</span> <span class="nam">initializeGL</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t28" href="#t28">28</a></span><span class="t"> <span class="str">"""Initialize OpenGL resources"""</span> </span><span class="r"></span></p>
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<p class="mis show_mis"><span class="n"><a id="t29" href="#t29">29</a></span><span class="t"> <span class="nam">glClearColor</span><span class="op">(</span><span class="num">1.0</span><span class="op">,</span> <span class="num">1.0</span><span class="op">,</span> <span class="num">1.0</span><span class="op">,</span> <span class="num">1.0</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="mis show_mis"><span class="n"><a id="t30" href="#t30">30</a></span><span class="t"> <span class="nam">glEnable</span><span class="op">(</span><span class="nam">GL_DEPTH_TEST</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t31" href="#t31">31</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t32" href="#t32">32</a></span><span class="t"> <span class="key">def</span> <span class="nam">resizeGL</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">w</span><span class="op">,</span> <span class="nam">h</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t33" href="#t33">33</a></span><span class="t"> <span class="str">"""Handle window resizing"""</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t34" href="#t34">34</a></span><span class="t"> <span class="nam">glViewport</span><span class="op">(</span><span class="num">0</span><span class="op">,</span> <span class="num">0</span><span class="op">,</span> <span class="nam">w</span><span class="op">,</span> <span class="nam">h</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t35" href="#t35">35</a></span><span class="t"> <span class="nam">glMatrixMode</span><span class="op">(</span><span class="nam">GL_PROJECTION</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t36" href="#t36">36</a></span><span class="t"> <span class="nam">glLoadIdentity</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t37" href="#t37">37</a></span><span class="t"> <span class="nam">glOrtho</span><span class="op">(</span><span class="num">0</span><span class="op">,</span> <span class="nam">w</span><span class="op">,</span> <span class="nam">h</span><span class="op">,</span> <span class="num">0</span><span class="op">,</span> <span class="op">-</span><span class="num">1</span><span class="op">,</span> <span class="num">1</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t38" href="#t38">38</a></span><span class="t"> <span class="nam">glMatrixMode</span><span class="op">(</span><span class="nam">GL_MODELVIEW</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t39" href="#t39">39</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t40" href="#t40">40</a></span><span class="t"> <span class="com"># Detect if this is a small resize (likely scrollbar visibility change)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t41" href="#t41">41</a></span><span class="t"> <span class="com"># Scrollbars are typically 14-20 pixels wide</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t42" href="#t42">42</a></span><span class="t"> <span class="nam">last_w</span><span class="op">,</span> <span class="nam">last_h</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">_last_viewport_size</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t43" href="#t43">43</a></span><span class="t"> <span class="nam">width_change</span> <span class="op">=</span> <span class="nam">abs</span><span class="op">(</span><span class="nam">w</span> <span class="op">-</span> <span class="nam">last_w</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t44" href="#t44">44</a></span><span class="t"> <span class="nam">height_change</span> <span class="op">=</span> <span class="nam">abs</span><span class="op">(</span><span class="nam">h</span> <span class="op">-</span> <span class="nam">last_h</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t45" href="#t45">45</a></span><span class="t"> <span class="nam">is_small_resize</span> <span class="op">=</span> <span class="nam">width_change</span> <span class="op"><=</span> <span class="num">20</span> <span class="key">and</span> <span class="nam">height_change</span> <span class="op"><=</span> <span class="num">20</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t46" href="#t46">46</a></span><span class="t"> <span class="nam">is_first_resize</span> <span class="op">=</span> <span class="nam">last_w</span> <span class="op">==</span> <span class="num">0</span> <span class="key">and</span> <span class="nam">last_h</span> <span class="op">==</span> <span class="num">0</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t47" href="#t47">47</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t48" href="#t48">48</a></span><span class="t"> <span class="com"># Recalculate centering if we have a project loaded</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t49" href="#t49">49</a></span><span class="t"> <span class="com"># Recenter on:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t50" href="#t50">50</a></span><span class="t"> <span class="com"># 1. First resize (initial setup)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t51" href="#t51">51</a></span><span class="t"> <span class="com"># 2. Large resizes (window resize, NOT scrollbar changes)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t52" href="#t52">52</a></span><span class="t"> <span class="com"># Don't recenter on small resizes (scrollbar visibility changes during zoom)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t53" href="#t53">53</a></span><span class="t"> <span class="key">if</span> <span class="nam">self</span><span class="op">.</span><span class="nam">initial_zoom_set</span> <span class="key">and</span> <span class="op">(</span><span class="nam">is_first_resize</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">is_small_resize</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t54" href="#t54">54</a></span><span class="t"> <span class="com"># Maintain current zoom level, just recenter</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t55" href="#t55">55</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">pan_offset</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">_calculate_center_pan_offset</span><span class="op">(</span><span class="nam">self</span><span class="op">.</span><span class="nam">zoom_level</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t56" href="#t56">56</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t57" href="#t57">57</a></span><span class="t"> <span class="com"># Update tracked viewport size</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t58" href="#t58">58</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">_last_viewport_size</span> <span class="op">=</span> <span class="op">(</span><span class="nam">w</span><span class="op">,</span> <span class="nam">h</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t59" href="#t59">59</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t60" href="#t60">60</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">update</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t61" href="#t61">61</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t62" href="#t62">62</a></span><span class="t"> <span class="com"># Update scrollbars when viewport size changes</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t63" href="#t63">63</a></span><span class="t"> <span class="nam">main_window</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">window</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t64" href="#t64">64</a></span><span class="t"> <span class="key">if</span> <span class="nam">hasattr</span><span class="op">(</span><span class="nam">main_window</span><span class="op">,</span> <span class="str">"update_scrollbars"</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t65" href="#t65">65</a></span><span class="t"> <span class="nam">main_window</span><span class="op">.</span><span class="nam">update_scrollbars</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t66" href="#t66">66</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t67" href="#t67">67</a></span><span class="t"> <span class="key">def</span> <span class="nam">_calculate_fit_to_screen_zoom</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t68" href="#t68">68</a></span><span class="t"> <span class="str">"""</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t69" href="#t69">69</a></span><span class="t"><span class="str"> Calculate zoom level to fit first page to screen.</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t70" href="#t70">70</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t71" href="#t71">71</a></span><span class="t"><span class="str"> Returns:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t72" href="#t72">72</a></span><span class="t"><span class="str"> float: Zoom level (1.0 = 100%, 0.5 = 50%, etc.)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t73" href="#t73">73</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t74" href="#t74">74</a></span><span class="t"> <span class="nam">main_window</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">window</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t75" href="#t75">75</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">hasattr</span><span class="op">(</span><span class="nam">main_window</span><span class="op">,</span> <span class="str">"project"</span><span class="op">)</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t76" href="#t76">76</a></span><span class="t"> <span class="key">return</span> <span class="num">1.0</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t77" href="#t77">77</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t78" href="#t78">78</a></span><span class="t"> <span class="nam">window_width</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">width</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t79" href="#t79">79</a></span><span class="t"> <span class="nam">window_height</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">height</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t80" href="#t80">80</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t81" href="#t81">81</a></span><span class="t"> <span class="com"># Get first page dimensions in mm</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t82" href="#t82">82</a></span><span class="t"> <span class="nam">first_page</span> <span class="op">=</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">[</span><span class="num">0</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t83" href="#t83">83</a></span><span class="t"> <span class="nam">page_width_mm</span><span class="op">,</span> <span class="nam">page_height_mm</span> <span class="op">=</span> <span class="nam">first_page</span><span class="op">.</span><span class="nam">layout</span><span class="op">.</span><span class="nam">size</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t84" href="#t84">84</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t85" href="#t85">85</a></span><span class="t"> <span class="com"># Convert to pixels</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t86" href="#t86">86</a></span><span class="t"> <span class="nam">dpi</span> <span class="op">=</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">working_dpi</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t87" href="#t87">87</a></span><span class="t"> <span class="nam">page_width_px</span> <span class="op">=</span> <span class="nam">page_width_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t88" href="#t88">88</a></span><span class="t"> <span class="nam">page_height_px</span> <span class="op">=</span> <span class="nam">page_height_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t89" href="#t89">89</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t90" href="#t90">90</a></span><span class="t"> <span class="com"># Calculate zoom to fit with margins</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t91" href="#t91">91</a></span><span class="t"> <span class="nam">margin</span> <span class="op">=</span> <span class="num">100</span> <span class="com"># pixels</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t92" href="#t92">92</a></span><span class="t"> <span class="nam">zoom_w</span> <span class="op">=</span> <span class="op">(</span><span class="nam">window_width</span> <span class="op">-</span> <span class="nam">margin</span> <span class="op">*</span> <span class="num">2</span><span class="op">)</span> <span class="op">/</span> <span class="nam">page_width_px</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t93" href="#t93">93</a></span><span class="t"> <span class="nam">zoom_h</span> <span class="op">=</span> <span class="op">(</span><span class="nam">window_height</span> <span class="op">-</span> <span class="nam">margin</span> <span class="op">*</span> <span class="num">2</span><span class="op">)</span> <span class="op">/</span> <span class="nam">page_height_px</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t94" href="#t94">94</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t95" href="#t95">95</a></span><span class="t"> <span class="com"># Use the smaller zoom to ensure entire page fits</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t96" href="#t96">96</a></span><span class="t"> <span class="key">return</span> <span class="nam">min</span><span class="op">(</span><span class="nam">zoom_w</span><span class="op">,</span> <span class="nam">zoom_h</span><span class="op">,</span> <span class="num">1.0</span><span class="op">)</span> <span class="com"># Don't zoom in beyond 100%</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t97" href="#t97">97</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t98" href="#t98">98</a></span><span class="t"> <span class="key">def</span> <span class="nam">_calculate_center_pan_offset</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">zoom_level</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t99" href="#t99">99</a></span><span class="t"> <span class="str">"""</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t100" href="#t100">100</a></span><span class="t"><span class="str"> Calculate pan offset to center the first page in the viewport.</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t101" href="#t101">101</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t102" href="#t102">102</a></span><span class="t"><span class="str"> Args:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t103" href="#t103">103</a></span><span class="t"><span class="str"> zoom_level: The current zoom level to use for calculations</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t104" href="#t104">104</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t105" href="#t105">105</a></span><span class="t"><span class="str"> Returns:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t106" href="#t106">106</a></span><span class="t"><span class="str"> list: [x_offset, y_offset] to center the page</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t107" href="#t107">107</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t108" href="#t108">108</a></span><span class="t"> <span class="nam">main_window</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">window</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t109" href="#t109">109</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">hasattr</span><span class="op">(</span><span class="nam">main_window</span><span class="op">,</span> <span class="str">"project"</span><span class="op">)</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t110" href="#t110">110</a></span><span class="t"> <span class="key">return</span> <span class="op">[</span><span class="num">0</span><span class="op">,</span> <span class="num">0</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t111" href="#t111">111</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t112" href="#t112">112</a></span><span class="t"> <span class="nam">window_width</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">width</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t113" href="#t113">113</a></span><span class="t"> <span class="nam">window_height</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">height</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t114" href="#t114">114</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t115" href="#t115">115</a></span><span class="t"> <span class="com"># Get first page dimensions in mm</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t116" href="#t116">116</a></span><span class="t"> <span class="nam">first_page</span> <span class="op">=</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">[</span><span class="num">0</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t117" href="#t117">117</a></span><span class="t"> <span class="nam">page_width_mm</span><span class="op">,</span> <span class="nam">page_height_mm</span> <span class="op">=</span> <span class="nam">first_page</span><span class="op">.</span><span class="nam">layout</span><span class="op">.</span><span class="nam">size</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t118" href="#t118">118</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t119" href="#t119">119</a></span><span class="t"> <span class="com"># Convert to pixels</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t120" href="#t120">120</a></span><span class="t"> <span class="nam">dpi</span> <span class="op">=</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">working_dpi</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t121" href="#t121">121</a></span><span class="t"> <span class="nam">page_width_px</span> <span class="op">=</span> <span class="nam">page_width_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t122" href="#t122">122</a></span><span class="t"> <span class="nam">page_height_px</span> <span class="op">=</span> <span class="nam">page_height_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t123" href="#t123">123</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t124" href="#t124">124</a></span><span class="t"> <span class="com"># Apply zoom to get screen dimensions</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t125" href="#t125">125</a></span><span class="t"> <span class="nam">screen_page_width</span> <span class="op">=</span> <span class="nam">page_width_px</span> <span class="op">*</span> <span class="nam">zoom_level</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t126" href="#t126">126</a></span><span class="t"> <span class="nam">screen_page_height</span> <span class="op">=</span> <span class="nam">page_height_px</span> <span class="op">*</span> <span class="nam">zoom_level</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t127" href="#t127">127</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t128" href="#t128">128</a></span><span class="t"> <span class="com"># Calculate offsets to center the page</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t129" href="#t129">129</a></span><span class="t"> <span class="com"># PAGE_MARGIN from rendering.py is 50</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t130" href="#t130">130</a></span><span class="t"> <span class="nam">PAGE_MARGIN</span> <span class="op">=</span> <span class="num">50</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t131" href="#t131">131</a></span><span class="t"> <span class="nam">x_offset</span> <span class="op">=</span> <span class="op">(</span><span class="nam">window_width</span> <span class="op">-</span> <span class="nam">screen_page_width</span><span class="op">)</span> <span class="op">/</span> <span class="num">2</span> <span class="op">-</span> <span class="nam">PAGE_MARGIN</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t132" href="#t132">132</a></span><span class="t"> <span class="nam">y_offset</span> <span class="op">=</span> <span class="op">(</span><span class="nam">window_height</span> <span class="op">-</span> <span class="nam">screen_page_height</span><span class="op">)</span> <span class="op">/</span> <span class="num">2</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t133" href="#t133">133</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t134" href="#t134">134</a></span><span class="t"> <span class="key">return</span> <span class="op">[</span><span class="nam">x_offset</span><span class="op">,</span> <span class="nam">y_offset</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t135" href="#t135">135</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t136" href="#t136">136</a></span><span class="t"> <span class="key">def</span> <span class="nam">get_content_bounds</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t137" href="#t137">137</a></span><span class="t"> <span class="str">"""</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t138" href="#t138">138</a></span><span class="t"><span class="str"> Calculate the total bounds of all content (pages).</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t139" href="#t139">139</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t140" href="#t140">140</a></span><span class="t"><span class="str"> Returns:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t141" href="#t141">141</a></span><span class="t"><span class="str"> dict: {'min_x', 'max_x', 'min_y', 'max_y', 'width', 'height'} in pixels</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t142" href="#t142">142</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t143" href="#t143">143</a></span><span class="t"> <span class="nam">main_window</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">window</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t144" href="#t144">144</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">hasattr</span><span class="op">(</span><span class="nam">main_window</span><span class="op">,</span> <span class="str">"project"</span><span class="op">)</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t145" href="#t145">145</a></span><span class="t"> <span class="key">return</span> <span class="op">{</span><span class="str">"min_x"</span><span class="op">:</span> <span class="num">0</span><span class="op">,</span> <span class="str">"max_x"</span><span class="op">:</span> <span class="num">800</span><span class="op">,</span> <span class="str">"min_y"</span><span class="op">:</span> <span class="num">0</span><span class="op">,</span> <span class="str">"max_y"</span><span class="op">:</span> <span class="num">600</span><span class="op">,</span> <span class="str">"width"</span><span class="op">:</span> <span class="num">800</span><span class="op">,</span> <span class="str">"height"</span><span class="op">:</span> <span class="num">600</span><span class="op">}</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t146" href="#t146">146</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t147" href="#t147">147</a></span><span class="t"> <span class="nam">dpi</span> <span class="op">=</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">working_dpi</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t148" href="#t148">148</a></span><span class="t"> <span class="nam">PAGE_MARGIN</span> <span class="op">=</span> <span class="num">50</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t149" href="#t149">149</a></span><span class="t"> <span class="nam">PAGE_SPACING</span> <span class="op">=</span> <span class="num">50</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t150" href="#t150">150</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t151" href="#t151">151</a></span><span class="t"> <span class="com"># Calculate total dimensions</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t152" href="#t152">152</a></span><span class="t"> <span class="nam">total_height</span> <span class="op">=</span> <span class="nam">PAGE_MARGIN</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t153" href="#t153">153</a></span><span class="t"> <span class="nam">max_width</span> <span class="op">=</span> <span class="num">0</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t154" href="#t154">154</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t155" href="#t155">155</a></span><span class="t"> <span class="key">for</span> <span class="nam">page</span> <span class="key">in</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t156" href="#t156">156</a></span><span class="t"> <span class="nam">page_width_mm</span><span class="op">,</span> <span class="nam">page_height_mm</span> <span class="op">=</span> <span class="nam">page</span><span class="op">.</span><span class="nam">layout</span><span class="op">.</span><span class="nam">size</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t157" href="#t157">157</a></span><span class="t"> <span class="nam">page_width_px</span> <span class="op">=</span> <span class="nam">page_width_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t158" href="#t158">158</a></span><span class="t"> <span class="nam">page_height_px</span> <span class="op">=</span> <span class="nam">page_height_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t159" href="#t159">159</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t160" href="#t160">160</a></span><span class="t"> <span class="nam">screen_page_width</span> <span class="op">=</span> <span class="nam">page_width_px</span> <span class="op">*</span> <span class="nam">self</span><span class="op">.</span><span class="nam">zoom_level</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t161" href="#t161">161</a></span><span class="t"> <span class="nam">screen_page_height</span> <span class="op">=</span> <span class="nam">page_height_px</span> <span class="op">*</span> <span class="nam">self</span><span class="op">.</span><span class="nam">zoom_level</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t162" href="#t162">162</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t163" href="#t163">163</a></span><span class="t"> <span class="nam">total_height</span> <span class="op">+=</span> <span class="nam">screen_page_height</span> <span class="op">+</span> <span class="nam">PAGE_SPACING</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t164" href="#t164">164</a></span><span class="t"> <span class="nam">max_width</span> <span class="op">=</span> <span class="nam">max</span><span class="op">(</span><span class="nam">max_width</span><span class="op">,</span> <span class="nam">screen_page_width</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t165" href="#t165">165</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t166" href="#t166">166</a></span><span class="t"> <span class="nam">total_width</span> <span class="op">=</span> <span class="nam">max_width</span> <span class="op">+</span> <span class="nam">PAGE_MARGIN</span> <span class="op">*</span> <span class="num">2</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t167" href="#t167">167</a></span><span class="t"> <span class="nam">total_height</span> <span class="op">+=</span> <span class="nam">PAGE_MARGIN</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t168" href="#t168">168</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t169" href="#t169">169</a></span><span class="t"> <span class="key">return</span> <span class="op">{</span> </span><span class="r"></span></p>
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<p class="run run2"><span class="n"><a id="t170" href="#t170">170</a></span><span class="t"> <span class="str">"min_x"</span><span class="op">:</span> <span class="num">0</span><span class="op">,</span> </span><span class="r"></span></p>
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<p class="run run2"><span class="n"><a id="t171" href="#t171">171</a></span><span class="t"> <span class="str">"max_x"</span><span class="op">:</span> <span class="nam">total_width</span><span class="op">,</span> </span><span class="r"></span></p>
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<p class="run run2"><span class="n"><a id="t172" href="#t172">172</a></span><span class="t"> <span class="str">"min_y"</span><span class="op">:</span> <span class="num">0</span><span class="op">,</span> </span><span class="r"></span></p>
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<p class="run run2"><span class="n"><a id="t173" href="#t173">173</a></span><span class="t"> <span class="str">"max_y"</span><span class="op">:</span> <span class="nam">total_height</span><span class="op">,</span> </span><span class="r"></span></p>
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<p class="run run2"><span class="n"><a id="t174" href="#t174">174</a></span><span class="t"> <span class="str">"width"</span><span class="op">:</span> <span class="nam">total_width</span><span class="op">,</span> </span><span class="r"></span></p>
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<p class="run run2"><span class="n"><a id="t175" href="#t175">175</a></span><span class="t"> <span class="str">"height"</span><span class="op">:</span> <span class="nam">total_height</span><span class="op">,</span> </span><span class="r"></span></p>
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<p class="run run2"><span class="n"><a id="t176" href="#t176">176</a></span><span class="t"> <span class="op">}</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t177" href="#t177">177</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t178" href="#t178">178</a></span><span class="t"> <span class="key">def</span> <span class="nam">_clamp_vertical_pan</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">viewport_height</span><span class="op">:</span> <span class="nam">float</span><span class="op">)</span> <span class="op">-></span> <span class="nam">float</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t179" href="#t179">179</a></span><span class="t"> <span class="str">"""Clamp vertical pan offset and return the original value before clamping."""</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t180" href="#t180">180</a></span><span class="t"> <span class="nam">bounds</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">get_content_bounds</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t181" href="#t181">181</a></span><span class="t"> <span class="nam">content_height</span> <span class="op">=</span> <span class="nam">bounds</span><span class="op">[</span><span class="str">"height"</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t182" href="#t182">182</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t183" href="#t183">183</a></span><span class="t"> <span class="com"># Save original for page selection (prevents clamping from changing which page we target)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t184" href="#t184">184</a></span><span class="t"> <span class="nam">original_pan_y</span><span class="op">:</span> <span class="nam">float</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">pan_offset</span><span class="op">[</span><span class="num">1</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t185" href="#t185">185</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t186" href="#t186">186</a></span><span class="t"> <span class="key">if</span> <span class="nam">content_height</span> <span class="op">></span> <span class="nam">viewport_height</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t187" href="#t187">187</a></span><span class="t"> <span class="nam">max_pan_up</span> <span class="op">=</span> <span class="num">0</span> <span class="com"># Can't pan beyond top edge</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t188" href="#t188">188</a></span><span class="t"> <span class="nam">min_pan_up</span> <span class="op">=</span> <span class="op">-</span><span class="op">(</span><span class="nam">content_height</span> <span class="op">-</span> <span class="nam">viewport_height</span><span class="op">)</span> <span class="com"># Can't pan beyond bottom edge</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t189" href="#t189">189</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">pan_offset</span><span class="op">[</span><span class="num">1</span><span class="op">]</span> <span class="op">=</span> <span class="nam">max</span><span class="op">(</span><span class="nam">min_pan_up</span><span class="op">,</span> <span class="nam">min</span><span class="op">(</span><span class="nam">max_pan_up</span><span class="op">,</span> <span class="nam">self</span><span class="op">.</span><span class="nam">pan_offset</span><span class="op">[</span><span class="num">1</span><span class="op">]</span><span class="op">)</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t190" href="#t190">190</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t191" href="#t191">191</a></span><span class="t"> <span class="key">return</span> <span class="nam">original_pan_y</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t192" href="#t192">192</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t193" href="#t193">193</a></span><span class="t"> <span class="key">def</span> <span class="nam">_build_page_centerlines</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">pages</span><span class="op">,</span> <span class="nam">dpi</span><span class="op">:</span> <span class="nam">float</span><span class="op">)</span> <span class="op">-></span> <span class="nam">list</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t194" href="#t194">194</a></span><span class="t"> <span class="str">"""Build list of (center_y, center_x, width) tuples for each page."""</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t195" href="#t195">195</a></span><span class="t"> <span class="nam">PAGE_MARGIN</span> <span class="op">=</span> <span class="num">50</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t196" href="#t196">196</a></span><span class="t"> <span class="nam">PAGE_SPACING</span> <span class="op">=</span> <span class="num">50</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t197" href="#t197">197</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t198" href="#t198">198</a></span><span class="t"> <span class="nam">centerlines</span> <span class="op">=</span> <span class="op">[</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t199" href="#t199">199</a></span><span class="t"> <span class="nam">current_y</span> <span class="op">=</span> <span class="nam">PAGE_MARGIN</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t200" href="#t200">200</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t201" href="#t201">201</a></span><span class="t"> <span class="key">for</span> <span class="nam">page</span> <span class="key">in</span> <span class="nam">pages</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t202" href="#t202">202</a></span><span class="t"> <span class="nam">page_width_mm</span><span class="op">,</span> <span class="nam">page_height_mm</span> <span class="op">=</span> <span class="nam">page</span><span class="op">.</span><span class="nam">layout</span><span class="op">.</span><span class="nam">size</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t203" href="#t203">203</a></span><span class="t"> <span class="nam">screen_page_width</span> <span class="op">=</span> <span class="nam">page_width_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> <span class="op">*</span> <span class="nam">self</span><span class="op">.</span><span class="nam">zoom_level</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t204" href="#t204">204</a></span><span class="t"> <span class="nam">screen_page_height</span> <span class="op">=</span> <span class="nam">page_height_mm</span> <span class="op">*</span> <span class="nam">dpi</span> <span class="op">/</span> <span class="num">25.4</span> <span class="op">*</span> <span class="nam">self</span><span class="op">.</span><span class="nam">zoom_level</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t205" href="#t205">205</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t206" href="#t206">206</a></span><span class="t"> <span class="nam">page_center_y</span> <span class="op">=</span> <span class="nam">current_y</span> <span class="op">+</span> <span class="nam">screen_page_height</span> <span class="op">/</span> <span class="num">2</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t207" href="#t207">207</a></span><span class="t"> <span class="nam">page_center_x</span> <span class="op">=</span> <span class="nam">PAGE_MARGIN</span> <span class="op">+</span> <span class="nam">screen_page_width</span> <span class="op">/</span> <span class="num">2</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t208" href="#t208">208</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t209" href="#t209">209</a></span><span class="t"> <span class="nam">centerlines</span><span class="op">.</span><span class="nam">append</span><span class="op">(</span><span class="op">(</span><span class="nam">page_center_y</span><span class="op">,</span> <span class="nam">page_center_x</span><span class="op">,</span> <span class="nam">screen_page_width</span><span class="op">)</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t210" href="#t210">210</a></span><span class="t"> <span class="nam">current_y</span> <span class="op">+=</span> <span class="nam">screen_page_height</span> <span class="op">+</span> <span class="nam">PAGE_SPACING</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t211" href="#t211">211</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t212" href="#t212">212</a></span><span class="t"> <span class="key">return</span> <span class="nam">centerlines</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t213" href="#t213">213</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t214" href="#t214">214</a></span><span class="t"> <span class="key">def</span> <span class="nam">_interpolate_target_centerline</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">centerlines</span><span class="op">:</span> <span class="nam">list</span><span class="op">,</span> <span class="nam">viewport_center_y</span><span class="op">:</span> <span class="nam">float</span><span class="op">)</span> <span class="op">-></span> <span class="nam">tuple</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t215" href="#t215">215</a></span><span class="t"> <span class="str">"""Find target centerline by interpolating between pages based on viewport position."""</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t216" href="#t216">216</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">centerlines</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="mis show_mis"><span class="n"><a id="t217" href="#t217">217</a></span><span class="t"> <span class="key">return</span> <span class="num">0</span><span class="op">,</span> <span class="num">0</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t218" href="#t218">218</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t219" href="#t219">219</a></span><span class="t"> <span class="com"># Find the page index we're at or past</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t220" href="#t220">220</a></span><span class="t"> <span class="nam">page_idx</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">_find_page_at_viewport_y</span><span class="op">(</span><span class="nam">centerlines</span><span class="op">,</span> <span class="nam">viewport_center_y</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t221" href="#t221">221</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t222" href="#t222">222</a></span><span class="t"> <span class="key">if</span> <span class="nam">page_idx</span> <span class="op">==</span> <span class="num">0</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t223" href="#t223">223</a></span><span class="t"> <span class="key">return</span> <span class="nam">centerlines</span><span class="op">[</span><span class="num">0</span><span class="op">]</span><span class="op">[</span><span class="num">1</span><span class="op">]</span><span class="op">,</span> <span class="nam">centerlines</span><span class="op">[</span><span class="num">0</span><span class="op">]</span><span class="op">[</span><span class="num">2</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t224" href="#t224">224</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t225" href="#t225">225</a></span><span class="t"> <span class="com"># Interpolate between previous and current page</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t226" href="#t226">226</a></span><span class="t"> <span class="nam">prev_y</span><span class="op">,</span> <span class="nam">prev_x</span><span class="op">,</span> <span class="nam">prev_w</span> <span class="op">=</span> <span class="nam">centerlines</span><span class="op">[</span><span class="nam">page_idx</span> <span class="op">-</span> <span class="num">1</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t227" href="#t227">227</a></span><span class="t"> <span class="nam">curr_y</span><span class="op">,</span> <span class="nam">curr_x</span><span class="op">,</span> <span class="nam">curr_w</span> <span class="op">=</span> <span class="nam">centerlines</span><span class="op">[</span><span class="nam">page_idx</span><span class="op">]</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t228" href="#t228">228</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t229" href="#t229">229</a></span><span class="t"> <span class="key">if</span> <span class="nam">curr_y</span> <span class="op">==</span> <span class="nam">prev_y</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="mis show_mis"><span class="n"><a id="t230" href="#t230">230</a></span><span class="t"> <span class="key">return</span> <span class="nam">curr_x</span><span class="op">,</span> <span class="nam">curr_w</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t231" href="#t231">231</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t232" href="#t232">232</a></span><span class="t"> <span class="nam">t</span> <span class="op">=</span> <span class="nam">max</span><span class="op">(</span><span class="num">0</span><span class="op">,</span> <span class="nam">min</span><span class="op">(</span><span class="num">1</span><span class="op">,</span> <span class="op">(</span><span class="nam">viewport_center_y</span> <span class="op">-</span> <span class="nam">prev_y</span><span class="op">)</span> <span class="op">/</span> <span class="op">(</span><span class="nam">curr_y</span> <span class="op">-</span> <span class="nam">prev_y</span><span class="op">)</span><span class="op">)</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t233" href="#t233">233</a></span><span class="t"> <span class="key">return</span> <span class="nam">prev_x</span> <span class="op">+</span> <span class="nam">t</span> <span class="op">*</span> <span class="op">(</span><span class="nam">curr_x</span> <span class="op">-</span> <span class="nam">prev_x</span><span class="op">)</span><span class="op">,</span> <span class="nam">prev_w</span> <span class="op">+</span> <span class="nam">t</span> <span class="op">*</span> <span class="op">(</span><span class="nam">curr_w</span> <span class="op">-</span> <span class="nam">prev_w</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t234" href="#t234">234</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t235" href="#t235">235</a></span><span class="t"> <span class="key">def</span> <span class="nam">_find_page_at_viewport_y</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">centerlines</span><span class="op">:</span> <span class="nam">list</span><span class="op">,</span> <span class="nam">viewport_center_y</span><span class="op">:</span> <span class="nam">float</span><span class="op">)</span> <span class="op">-></span> <span class="nam">int</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t236" href="#t236">236</a></span><span class="t"> <span class="str">"""Find index of page at or after viewport Y position."""</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t237" href="#t237">237</a></span><span class="t"> <span class="key">for</span> <span class="nam">i</span><span class="op">,</span> <span class="op">(</span><span class="nam">page_y</span><span class="op">,</span> <span class="nam">_</span><span class="op">,</span> <span class="nam">_</span><span class="op">)</span> <span class="key">in</span> <span class="nam">enumerate</span><span class="op">(</span><span class="nam">centerlines</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t238" href="#t238">238</a></span><span class="t"> <span class="key">if</span> <span class="nam">viewport_center_y</span> <span class="op"><=</span> <span class="nam">page_y</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t239" href="#t239">239</a></span><span class="t"> <span class="key">return</span> <span class="nam">i</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t240" href="#t240">240</a></span><span class="t"> <span class="key">return</span> <span class="nam">len</span><span class="op">(</span><span class="nam">centerlines</span><span class="op">)</span> <span class="op">-</span> <span class="num">1</span> <span class="com"># Below all pages - use last</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t241" href="#t241">241</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t242" href="#t242">242</a></span><span class="t"> <span class="key">def</span> <span class="nam">_clamp_horizontal_pan</span><span class="op">(</span><span class="nam">self</span><span class="op">,</span> <span class="nam">viewport_width</span><span class="op">:</span> <span class="nam">float</span><span class="op">,</span> <span class="nam">target_centerline_x</span><span class="op">:</span> <span class="nam">float</span><span class="op">,</span> <span class="nam">target_page_width</span><span class="op">:</span> <span class="nam">float</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t243" href="#t243">243</a></span><span class="t"> <span class="str">"""Clamp horizontal pan to keep viewport centered on target page."""</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t244" href="#t244">244</a></span><span class="t"> <span class="nam">ideal_pan_x</span> <span class="op">=</span> <span class="nam">viewport_width</span> <span class="op">/</span> <span class="num">2</span> <span class="op">-</span> <span class="nam">target_centerline_x</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t245" href="#t245">245</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t246" href="#t246">246</a></span><span class="t"> <span class="key">if</span> <span class="nam">target_page_width</span> <span class="op">></span> <span class="nam">viewport_width</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t247" href="#t247">247</a></span><span class="t"> <span class="nam">max_deviation</span> <span class="op">=</span> <span class="op">(</span><span class="nam">target_page_width</span> <span class="op">/</span> <span class="num">2</span><span class="op">)</span> <span class="op">+</span> <span class="op">(</span><span class="nam">viewport_width</span> <span class="op">/</span> <span class="num">4</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t248" href="#t248">248</a></span><span class="t"> <span class="key">else</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t249" href="#t249">249</a></span><span class="t"> <span class="nam">max_deviation</span> <span class="op">=</span> <span class="num">100</span> <span class="com"># Small margin to avoid jitter</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t250" href="#t250">250</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t251" href="#t251">251</a></span><span class="t"> <span class="nam">min_pan_x</span> <span class="op">=</span> <span class="nam">ideal_pan_x</span> <span class="op">-</span> <span class="nam">max_deviation</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t252" href="#t252">252</a></span><span class="t"> <span class="nam">max_pan_x</span> <span class="op">=</span> <span class="nam">ideal_pan_x</span> <span class="op">+</span> <span class="nam">max_deviation</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t253" href="#t253">253</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t254" href="#t254">254</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">pan_offset</span><span class="op">[</span><span class="num">0</span><span class="op">]</span> <span class="op">=</span> <span class="nam">max</span><span class="op">(</span><span class="nam">min_pan_x</span><span class="op">,</span> <span class="nam">min</span><span class="op">(</span><span class="nam">max_pan_x</span><span class="op">,</span> <span class="nam">self</span><span class="op">.</span><span class="nam">pan_offset</span><span class="op">[</span><span class="num">0</span><span class="op">]</span><span class="op">)</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t255" href="#t255">255</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t256" href="#t256">256</a></span><span class="t"> <span class="key">def</span> <span class="nam">clamp_pan_offset</span><span class="op">(</span><span class="nam">self</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t257" href="#t257">257</a></span><span class="t"> <span class="str">"""</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t258" href="#t258">258</a></span><span class="t"><span class="str"> Clamp pan offset to prevent scrolling beyond content bounds.</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t259" href="#t259">259</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t260" href="#t260">260</a></span><span class="t"><span class="str"> Pan offset semantics:</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t261" href="#t261">261</a></span><span class="t"><span class="str"> - Positive pan_offset = content moved right/down (viewing top-left)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t262" href="#t262">262</a></span><span class="t"><span class="str"> - Negative pan_offset = content moved left/up (viewing bottom-right)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t263" href="#t263">263</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t264" href="#t264">264</a></span><span class="t"><span class="str"> For horizontal clamping, we use a centerline-based approach that interpolates</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t265" href="#t265">265</a></span><span class="t"><span class="str"> between page centers based on vertical scroll position. This prevents jumps</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t266" href="#t266">266</a></span><span class="t"><span class="str"> when zooming on pages of different widths.</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t267" href="#t267">267</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t268" href="#t268">268</a></span><span class="t"> <span class="nam">main_window</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">window</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t269" href="#t269">269</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">hasattr</span><span class="op">(</span><span class="nam">main_window</span><span class="op">,</span> <span class="str">"project"</span><span class="op">)</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span> <span class="key">or</span> <span class="key">not</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t270" href="#t270">270</a></span><span class="t"> <span class="key">return</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t271" href="#t271">271</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t272" href="#t272">272</a></span><span class="t"> <span class="nam">viewport_width</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">width</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t273" href="#t273">273</a></span><span class="t"> <span class="nam">viewport_height</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">height</span><span class="op">(</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t274" href="#t274">274</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t275" href="#t275">275</a></span><span class="t"> <span class="com"># Vertical clamping (returns original pan_y for page selection)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t276" href="#t276">276</a></span><span class="t"> <span class="nam">original_pan_y</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">_clamp_vertical_pan</span><span class="op">(</span><span class="nam">viewport_height</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t277" href="#t277">277</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t278" href="#t278">278</a></span><span class="t"> <span class="com"># Build page centerline data</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t279" href="#t279">279</a></span><span class="t"> <span class="nam">dpi</span> <span class="op">=</span> <span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">working_dpi</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t280" href="#t280">280</a></span><span class="t"> <span class="nam">centerlines</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">_build_page_centerlines</span><span class="op">(</span><span class="nam">main_window</span><span class="op">.</span><span class="nam">project</span><span class="op">.</span><span class="nam">pages</span><span class="op">,</span> <span class="nam">dpi</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t281" href="#t281">281</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">centerlines</span><span class="op">:</span> </span><span class="r"></span></p>
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<p class="mis show_mis"><span class="n"><a id="t282" href="#t282">282</a></span><span class="t"> <span class="key">return</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t283" href="#t283">283</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t284" href="#t284">284</a></span><span class="t"> <span class="com"># Find target centerline by interpolating based on viewport position</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t285" href="#t285">285</a></span><span class="t"> <span class="nam">viewport_center_y</span> <span class="op">=</span> <span class="op">-</span><span class="nam">original_pan_y</span> <span class="op">+</span> <span class="nam">viewport_height</span> <span class="op">/</span> <span class="num">2</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t286" href="#t286">286</a></span><span class="t"> <span class="nam">target_x</span><span class="op">,</span> <span class="nam">target_width</span> <span class="op">=</span> <span class="nam">self</span><span class="op">.</span><span class="nam">_interpolate_target_centerline</span><span class="op">(</span><span class="nam">centerlines</span><span class="op">,</span> <span class="nam">viewport_center_y</span><span class="op">)</span> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t287" href="#t287">287</a></span><span class="t"> </span><span class="r"></span></p>
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<p class="pln"><span class="n"><a id="t288" href="#t288">288</a></span><span class="t"> <span class="com"># Horizontal clamping</span> </span><span class="r"></span></p>
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<p class="run"><span class="n"><a id="t289" href="#t289">289</a></span><span class="t"> <span class="nam">self</span><span class="op">.</span><span class="nam">_clamp_horizontal_pan</span><span class="op">(</span><span class="nam">viewport_width</span><span class="op">,</span> <span class="nam">target_x</span><span class="op">,</span> <span class="nam">target_width</span><span class="op">)</span> </span><span class="r"></span></p>
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