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ruby/sample/trick2022/02-tompng/remarks.markdown

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Remarks

  1. Run it with ruby entry.rb 8080

  2. Open "http://localhost:8080"

  3. Click on the screen and interact with it

I confirmed the following implementations/platforms:

  • Ruby Version
    • ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-darwin20]
  • Browser
    • Chrome(macOS, Android)
    • Firefox(macOS)
    • Edge(macOS)

Description

This program is an HTTP server that provides a fractal creature playground. You can see the heartbeat of a mysterious fractal creature. Clicking on the screen will change the shape of the creature. Surprisingly, this interactive webpage is built without JavaScript.

Internals

Fractal: Iterated function system Rendering from server: Streaming animated GIF Sending click event to server: <input type="image" src="streaming.gif"> with <form target="invisible_iframe">

Limitations

Does not work on Safari and iOS.