ActionScriptアニメーションより練習1

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ActionScript3.0アニメーションのP234の練習

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license : All rights reserved
modified : 2009-04-06 13:04:45

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package  {
	import flash.display.Sprite;
	import flash.events.Event;
	
	/**
	 * ...
	 * ActionScript3.0アニメーションのP234の練習
	 */
	public class Bubbles extends Sprite {
		private var balls:Array;
		private var centerBall:Ball;
		private var numBalls:Number = 20;
		private var bouce:Number = -0.9;
		private var spring:Number = .1;
		private var gravity:Number = 2;
		
		public function Bubbles() {
			init();
		}
		
		private function init():void{
			balls = new Array();
			centerBall = new Ball(100, 0xCCCCCC);
			centerBall.vx = Math.random() * 15 - 7
			centerBall.vy = Math.random() * 15 - 7;
			
			addChild(centerBall);
			centerBall.x = stage.stageWidth / 2;
			centerBall.y = stage.stageHeight / 2;
			
			
			for (var i:uint = 0; i <numBalls; i++) {
				var ball:Ball = new Ball(Math.random() * 40 + 5, Math.random() * 0xFFFFFF);
				ball.x = Math.random() * stage.stageWidth;
				ball.y = Math.random() * stage.stageHeight;
				ball.vx = Math.random() * 5 - 3;
				ball.vy = Math.random() * 5 - 3;
				addChild(ball);
				balls.push(ball);
				
			}
			addEventListener(Event.ENTER_FRAME, xEnterFrame);
			
		}
		
		private function xEnterFrame(e:Event):void {
			moveCenter(centerBall);
			for (var i:uint = 0; i < numBalls; i++) {
				var ball:Ball = balls[i];
				ball.vy += gravity;
				move(ball);
				var dx:Number = ball.x - centerBall.x;
				var dy:Number = ball.y - centerBall.y;
				var dist:Number = Math.sqrt(dx * dx + dy * dy);
				var minDist:Number = ball.radius + centerBall.radius;
				
				if (dist < minDist) {
					var angle:Number = Math.atan2(dy, dx);
					var tx:Number = centerBall.x + Math.cos(angle) * minDist;
					var ty:Number = centerBall.y + Math.sin(angle) * minDist;
					ball.vx += (tx - ball.x) * spring;
					ball.vy += (ty - ball.y) * spring;
				}
			}
		}
		
		private function move(ball:Ball):void {
			ball.x += ball.vx;
			ball.y += ball.vy;
			if (ball.x + ball.radius > stage.stageWidth) {
				ball.x = stage.stageWidth - ball.radius;
				ball.vx *= bouce;
			} else if (ball.x - ball.radius < 0) {
				ball.x = ball.radius;
				ball.vx *= bouce;
			}
			if (ball.y + ball.radius > stage.stageHeight) {
				ball.y = stage.stageHeight - ball.radius;
				ball.vy *= bouce;
			} else if (ball.y - ball.radius < 0) {
				ball.y = ball.radius;
				ball.vy *= bouce;
			}
		}
		private function moveCenter(ball:Ball):void {
			ball.x += ball.vx;
			ball.y += ball.vy;
			if (ball.x + ball.radius > stage.stageWidth) {
				ball.x = stage.stageWidth - ball.radius;
				ball.vx *= bouce;
			} else if (ball.x - ball.radius < 0) {
				ball.x = ball.radius;
				ball.vx *= bouce;
			}
			if (ball.y + ball.radius > stage.stageHeight) {
				ball.y = stage.stageHeight - ball.radius;
				ball.vy *= bouce;
			} else if (ball.y - ball.radius < 0) {
				ball.y = ball.radius;
				ball.vy *= bouce;
			}
		}
		
		
	}
	
}
import flash.display.Sprite;
class Ball extends Sprite {
	
	public var vx:Number = 0;
	public var vy:Number = 0;
	public var radius:Number;
	public var color:Number;
	
	public function Ball(radius:Number = 10, color:Number = 0xFF6600 ) {
		this.radius = radius;
		this.color = color;
		init();
	}
	
	private function init():void{
		graphics.beginFill(color);
		graphics.drawCircle(0, 0,radius);
		graphics.endFill();
	}
	
}

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