flash on 2009-12-30

by h_ike 30 Dec 2009

• Related works: 2

Tags

icu-cg2010
Embed

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

package {
    import flash.display.Sprite;
    import flash.events.*;
    [SWF (backgroundColor="0x000000")]
    public class FlashTest extends Sprite {
    		private var balls:Array;
    		private var ball:Ball;
    		private var numBalls:Number = 20;
    		private var bounce:Number = -0.2;
    		private var spring:Number = 0.9;
    		private var gravity:Number = 0;
    		
        public function FlashTest() {
        		balls = new Array();
        		for(var i:uint=0;i<numBalls;i++){
        			var ball:Ball = new Ball(8,Math.random()*0xffffff);
        			ball.x = Math.random()*stage.stageWidth;
        			ball.y = Math.random()*stage.stageHeight;
        			ball.vx = Math.random()*6 - 3;
        			ball.vy = Math.random()*6 - 3;
        			addChild(ball);
        			balls.push(ball);
        		}
        		addEventListener(Event.ENTER_FRAME,loop);
        } 
        private function loop(e:Event):void{
        		for(var i:uint=0;i<numBalls - 1;i++){
        			var ball0:Ball = balls[i];
        			for(var j:uint=i+1;j<numBalls;j++){
        				var ball1:Ball = balls[j];
        				var dx:Number = ball1.x - ball0.x;
        				var dy:Number = ball1.y - ball0.y;
        				var dist:Number = Math.sqrt(dx*dx + dy*dy);
        				var minDist:Number = ball0.radius + ball1.radius;
        				if(dist<minDist){
        					var angle:Number = Math.atan2(dy,dx);
        					var tx:Number = ball0.x + Math.cos(angle)*minDist;
        					var ty:Number = ball0.y + Math.sin(angle)*minDist;
        					var ax:Number = (tx - ball1.x)*spring;
        					var ay:Number = (ty - ball1.y)*spring;
        					ball0.vx -= ax;
        					ball0.vy -= ay;
        					ball1.vx += ax;
        					ball1.vy += ay;
        				}
        			}
        		}
        		for(i=0;i < numBalls;i++){
        			var ball:Ball = balls[i];
        			ball.vy += gravity;
        			ball.x += ball.vx;
        			ball.y += ball.vy;
        			if(ball.x + ball.radius > 465){
        				ball.x = 465 - ball.radius;
        				ball.vx *= bounce;
        			}else if(ball.x - ball.radius < 0){
        				ball.x = ball.radius;
        				ball.vx *= bounce;
        			}
        			if(ball.y + ball.radius > 465){
        				ball.y = 465 - ball.radius;
        				ball.vy *= bounce;
        			}else if(ball.y - ball.radius < 0){
        				ball.y = ball.radius;
        				ball.vy *= bounce;
        			}
        		}
        }
    }
}
import flash.display.*;
class Ball extends Sprite{
	public var radius:Number;
	private var color:uint;
	public var vx:Number = 0;
	public var vy:Number = 0;
	public function Ball(radius:Number=40,color:uint=0xff0000){
		this.radius = radius;
		this.color = color;
		this.vx=0;
		this.vy=0;
		this.graphics.beginFill(color);
		this.graphics.drawCircle(0,0,radius);
		this.graphics.endFill();
	}
}