forked from: base

/**
 * Copyright _wonder ( http://wonderfl.net/user/_wonder )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/m1ZE
 */

// forked from _wonder's base
package {
    import flash.display.Sprite;
    import flash.events.Event;
    
    public class Bill3 extends Sprite {
    		private var ball0:Ball;
    		private var ball1:Ball;
    		private var bounce:Number = -1.0;
    		
    		public function Bill3() {
            init();
        }
        
        private function init():void {
        		ball0 = new Ball(90);
        		ball0.mass = 2;
        		ball0.x = stage.stageWidth - 200;
        		ball0.y = stage.stageHeight - 200;
        		ball0.vx = Math.random() * 10 - 5;
        		ball0.vy = Math.random() * 10 - 5;
        		addChild( ball0 );
        		
        		ball1 = new Ball(90);0
        		ball1.mass = 1;
        		ball1.x = 100;
        		ball1.y = 100;
        		ball1.vx = Math.random() * 10 - 5;
        		ball1.vy = Math.random() * 10 - 5;
        		addChild( ball1 );
        		
        		addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        
        private function onEnterFrame(e:Event):void {
        		ball0.x += ball0.vx;
        		ball0.y += ball0.vy;
        		
        		ball1.x += ball1.vx;
        		ball1.y += ball1.vy;
        		
        		checkWalls( ball0 );
        		checkWalls( ball1 );	
        }
        
        private function checkCollision(ball0:Ball,ball1:Ball):void {
        		var dx:Number = ball1.x - ball0.x;
        		var dy:Number = ball1.y - ball0.y;
        		var dist:Number = Math.sqrt(dx*dx + dy*dy);
        		if( dist < ball0.radius + ball1.radius ){
        			//角度とsin,cosの計算
        			var angle:Number = Math.atan2( dy, dx );
        			var sin:Number = Math.sin( angle );
        			var cos:Number = Math.cos( angle );
        			
        			//ball0の回転
        			var x0:Number = 0;
        			var y0:Number = 0;
        			
        			//ball1の回転
        			var x1:Number = dx * cos + dy * sin;
        			var y1:Number = dy * cos - dx * sin;
        			
        			//ball0の速度の回転
        			var vx0:Number = ball0.vx * cos + ball0.vy * sin;
        			var vy0:Number = ball0.vy * cos - ball0.vx * sin;
        			
        			//ball1の速度の回転
        			var vx1:Number = ball1.vx * cos + ball1.vy * sin;
        			var vy1:Number = ball1.vy * cos - ball1.vx * sin;
        			
        			//衝突判定
        			var vxTotal:Number = vx0 - vx1;
        			vx0 = ( (ball0.mass - ball1.mass) * vx0 + 2 * ball1.mass * vx1 ) / ( ball0.mass + ball1.mass );
        			vx1 = vxTotal + vx0;
        			x0 += vx0;
        			x1 += vx1;
        			
        			//位置を回転
        			var x0Final:Number = x0 * cos - y0 * sin;
        			var y0Final:Number = y0 * cos + x0 * sin;
        			var x1Final:Number = x1 * cos - y1 * sin;
        			var y1Final:Number = y1 * cos - x1 * sin;
        			
        			//位置調節
        			ball1.x = ball0.x + x1Final;
        			ball1.y = ball0.y + y1Final;
        			ball0.x = ball0.x + x0Final;
        			ball0.y = ball0.y + y0Final;
        			
        			//速度の回転
        			ball0.vx = vx0 * cos - vy0 * sin;
        			ball0.vy = vy0 * cos + vx0 * sin;
        			ball1.vx = vx0 * cos - vy1 * sin;
        			ball1.vy = vy1 * cos + vx1 * sin;
        			
        		}	
        }
        
        private function checkWalls(ball:Ball):void {
        		if( ball.x + ball.radius > stage.stageWidth ){
        			ball.x = stage.stageWidth - ball.radius;
        			ball.vx *= bounce;
        		} else if ( ball.x - ball.radius < 0 ){
        			ball.x = ball.radius;
        			ball.vx *= bounce;
        		}
        		
        		if( ball.y + ball.radius > stage.stageWidth ){
        			ball.y = stage.stageHeight - ball.radius;
        			ball.vy *= bounce;
        		} else if ( ball.y - ball.radius < 0 ){
        			ball.y = ball.radius;
        			ball.vy *= bounce;
        		}
        }
    }
}

import flash.display.Sprite;

class Ball extends Sprite {
	public var radius:Number;
	public var color:uint;
	public var vx:Number = 0;
	public var vy:Number = 0;
	public var mass:Number = 1;
	
	public function Ball(radius:Number=40, color:uint=0Xff0000){
		this.radius = radius;
		this.color = color;
		init();
	}
	
	public function init():void {
		graphics.beginFill(color);
		graphics.drawCircle(0, 0, radius);
		graphics.endFill();
	}
}