Langton's ant ラングトンのアリ
Yet another implementation of Langton's ant
This is made for "どう書く？org", http://ja.doukaku.org/276/
This code is written by xsd.
/**
* Copyright xsd ( http://wonderfl.net/user/xsd )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/bE10
*/
package {
// Yet another implementation of Langton's ant
// This is made for "どう書く？org", http://ja.doukaku.org/276/
// This code is written by xsd.
import flash.display.Sprite;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.Rectangle;
import flash.events.Event;
import flash.text.TextField;
import flash.text.TextFormat;
[SWF(width="465", height="465", backgroundColor="0xFFFFFF", frameRate="30")]
public class LangtonsAnt extends Sprite {
private const SCREEN_WIDTH:int = 465;
private const SCREEN_HEIGHT:int = 465;
private const CELL_SIZE:int = 4;
private const STEP:int = 10;
private var bm:BitmapData;
private var bmp:Bitmap;
private var tf:TextField;
private var xAnt:int = 200;
private var yAnt:int = 200;
private var vx:int = 1;
private var vy:int = 0;
private var count:int = 0;
public function LangtonsAnt():void {
bm = new BitmapData(SCREEN_WIDTH, SCREEN_HEIGHT, false, 0xFFFFFF);
bmp = new Bitmap(bm);
this.addChild(bmp);
tf = new TextField();
tf.defaultTextFormat = new TextFormat("_Serif", 24, 0, true);
tf.x = 0; tf.y = SCREEN_HEIGHT - 32; tf.width = SCREEN_HEIGHT; tf.height = 32;
tf.selectable = false;
this.addChild(tf);
this.addEventListener(Event.ENTER_FRAME, update);
}
public function update(event:Event):void {
bm.lock();
var t:int, i:int;
for (i = 0; i < STEP; i++) {
xAnt += vx * CELL_SIZE;
yAnt += vy * CELL_SIZE;
var a:int = bm.getPixel(xAnt, yAnt);
if (a == 0) {
bm.fillRect(new Rectangle(xAnt, yAnt, CELL_SIZE, CELL_SIZE), 0xFFFFFF);
t = vx; vx = vy; vy = -t;
} else {
bm.fillRect(new Rectangle(xAnt, yAnt, CELL_SIZE, CELL_SIZE), 0x000000);
t = vy; vy = vx; vx = -t;
}
bm.unlock();
if (xAnt <= CELL_SIZE || xAnt >= SCREEN_WIDTH - CELL_SIZE ||
yAnt <= CELL_SIZE || yAnt >= SCREEN_HEIGHT - CELL_SIZE) {
this.removeEventListener(Event.ENTER_FRAME, update);
break;
}
count++;
tf.text = "Step: "+count;
}
}
}
}