Chapter 15 Example 3

/**
 * Copyright actionscriptbible ( http://wonderfl.net/user/actionscriptbible )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/urMd
 */

package {
  import flash.display.Sprite;
  import flash.events.Event;
  public class ch15ex3 extends Sprite {
    protected var canvas:Canvas;
    public function ch15ex3() {
      canvas = new Canvas(400, 300);
      addChild(canvas);
      canvas.x = stage.stageWidth/2;
      canvas.y = stage.stageHeight/2;
      canvas.rotationY = 25;
      addEventListener(Event.ENTER_FRAME, onEnterFrame);
    }
    protected function onEnterFrame(event:Event):void {
      canvas.rotationY += 0.2;
      canvas.rotationX += 0.04;
    }
  }
}
import flash.display.Shape;
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.geom.Rectangle;
class Canvas extends Sprite {
  protected var fg:Shape, bg:Shape;
  protected var ink:int = 0;
  public function Canvas(w:Number, h:Number) {
    bg = new Shape();
    bg.graphics.beginFill(0xe0e0e0, 1);
    bg.graphics.drawRect(0, 0, w, h);
    bg.x = -w/2; bg.y = -h/2;
    addChild(bg);
    fg = new Shape();
    fg.x = -w/2; fg.y = -h/2;
    addChild(fg);
    fg.scrollRect = new Rectangle(-w/2, -h/2, w, h);
    addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
  }
  protected function onMouseMove(event:MouseEvent):void {
    if (event.buttonDown) {
      ink++;
      fg.graphics.lineTo(event.localX, event.localY);
    } else {
      if (ink > 500) {
        fg.graphics.clear();
        ink = 0;
      }
      fg.graphics.lineStyle(32, 0xffffff * Math.random(), 0.4);
      fg.graphics.moveTo(event.localX, event.localY);
    }
  }
}