pyWebLayout/examples/gifs

EbookReader Animated Demonstrations

This directory contains animated GIF demonstrations of the pyWebLayout EbookReader functionality.

Generated GIFs

1. Page Navigation (ereader_page_navigation.gif)

Demonstrates forward and backward page navigation through an EPUB book. Shows smooth transitions between pages using next_page() and previous_page() methods.

Features shown:

• Sequential page advancement
• Page-by-page content rendering
• Natural reading flow

2. Font Size Adjustment (ereader_font_size.gif)

Shows dynamic font size scaling from 0.8x to 1.4x and back. The reader maintains the current reading position even as the layout changes with different font sizes.

Features shown:

• increase_font_size() / decrease_font_size()
• set_font_size(scale) with specific values
• Position preservation across layout changes
• Text reflow with different sizes

3. Chapter Navigation (ereader_chapter_navigation.gif)

Demonstrates jumping between chapters in a book. Each chapter's first page is displayed, showing the ability to navigate non-linearly through the content.

Features shown:

• jump_to_chapter(index) for index-based navigation
• jump_to_chapter(title) for title-based navigation
• get_chapters() to list available chapters
• Quick access to any part of the book

4. Bookmarks & Positions (ereader_bookmarks.gif)

Illustrates the bookmark system: navigating to a position, saving it, navigating away, and then returning to the saved position.

Features shown:

• save_position(name) to bookmark current location
• load_position(name) to return to saved bookmark
• Position stability across navigation
• Multiple bookmark support

Generating Your Own GIFs

To generate these animations with your own EPUB file:

cd examples
python generate_ereader_gifs.py path/to/your/book.epub gifs/

This will create all four GIF animations in the specified output directory.

Script Options

python generate_ereader_gifs.py <epub_path> [output_dir]

• epub_path: Path to your EPUB file (required)
• output_dir: Directory to save GIFs (default: current directory)

Customization

You can modify generate_ereader_gifs.py to adjust:

• Frame duration (duration parameter in create_gif())
• Page dimensions (change page_size in EbookReader)
• Number of frames for each animation
• Font scale ranges
• Animation sequences

Technical Details

• Format: Animated GIF
• Page Size: 600x800 pixels
• Frame Rate: Variable (500-1000ms per frame)
• Loop: Infinite
• Book Used: Alice's Adventures in Wonderland (test.epub)

File Sizes

GIF	Size	Frames	Duration per Frame
ereader_page_navigation.gif	~500 KB	10	600ms
ereader_font_size.gif	~680 KB	13	500ms
ereader_chapter_navigation.gif	~290 KB	11	1000ms
ereader_bookmarks.gif	~500 KB	17	600ms

Usage in Documentation

These GIFs are embedded in the main README.md to showcase the EbookReader's capabilities to potential users.

To embed in Markdown:

![Page Navigation](examples/gifs/ereader_page_navigation.gif)

To embed in HTML with size control:

<img src="examples/gifs/ereader_page_navigation.gif" width="300" alt="Page Navigation">