// forked from sakusan393's ActionScriptアニメーションより練習1 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 = 10; 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(); } }