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City From Fire (Cellular Automata)

September 27th, 2008

This is another sketch dug up from my Cellular Automata folder. As I mentioned in my previous post about Cellular Automata - I like to base the rules on the color of the current pixel and its neighbors. This example looks like a city being built from fire:





Click either of the above images to view flash version

If you watch this for about 20 or 30 seconds nearly all the fire should disappear - leaving red pixels wandering through gray corridors.

Once you've got a basic template for this type of CA... you can just play with the code. After awhile you can even begin to predict some of the results and really control what your CA does. The following code snippet should help you get started... it creates 300 vertically wandering red pixels:

PLAIN TEXT
Actionscript:
  1. // current pixel
  2. var pix:uint;
  3.  
  4. var size:Number = 200;
  5. // read from the pixels BitmapData and write to the buffer BitmapData
  6. var pixels:BitmapData = new BitmapData(size,size, false, 0x000001);
  7. var buffer:BitmapData = new BitmapData(size,size, false, 0x000001);
  8.  
  9. var frame:Bitmap = new Bitmap(pixels);
  10. addChild(frame);
  11.  
  12. frame.scaleX= 2;
  13. frame.scaleY = 2;
  14.  
  15. // place 300 red pixels
  16. for (var i = 0; i<300; i++) {
  17.     buffer.setPixel(100 + Math.random()*40-20, 100 + Math.random()*40-20, 0xFF0000);
  18. }
  19.  
  20. addEventListener(Event.ENTER_FRAME, onLoop);
  21. function onLoop(evt:Event):void {
  22.     for (var i:int = 0; i<size; i++) {
  23.         for (var j:int = 0; j<size; j++) {
  24.             pix = pixels.getPixel(j, i);
  25.             // add additional logic here:
  26.             if (pix == 0xFF0000) {
  27.                   buffer.setPixel(j, i, 0x000001);
  28.                   buffer.setPixel(j, i+Math.random()*4-2, 0xFF0000);
  29.                   // and here
  30.             }
  31.         }
  32.     }
  33.     pixels.draw(buffer);
  34. }

This entry was posted on Saturday, September 27th, 2008 at 9:29 am and is filed under actionscript, cellular automata, code snippets, experiments, sketches.

3 Responses to “City From Fire (Cellular Automata)”

  1. subblue Says:
    October 13th, 2008 at 5:17 am

    I like how the plumes of fire spread through the corridors later in the simulation

  2. 11111RAKE11111 Says:
    November 10th, 2008 at 3:33 pm

    fire gets fired at the end. haha i like it.

  3. zevan Says:
    November 10th, 2008 at 3:46 pm

    heh. thanks 11111RAKE11111.

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