// forked from 5ivestar's Flight404 Particles // yd_niku さんの // Flight404 の人のコードをAS3にしてみた ver2 // http://wonderfl.kayac.com/code/881224c6000816b64f79b854671a48eeeac7c8d0 // をもとに Flash でもそれなりの速度が出るよう書き直した // 画像をプリレンダリングしたり // Particle オブジェクトを使い回したり // 機を見て BitmapData.draw でなく BitmapData.copyPixels を使ったり等している // trails は未実装 package { import flash.display.*; import flash.events.*; import flash.geom.*; import flash.text.*; //import com.flashdynamix.utils.SWFProfiler; [SWF(backgroundColor="#000000", frameRate="120")] public class Particles extends Sprite { private var canvas:BitmapData; private var emitter:Emitter; private var mousePressed:Boolean; private var stats:TextField; public function Particles() { //SWFProfiler.init(stage, this); stage.quality = "low"; stage.scaleMode = "noScale"; stage.align = "TL"; canvas = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0x000000); addChild(new Bitmap(canvas)); emitter = new Emitter(canvas); /*stats = new TextField(); stats.x = 5; stats.y = 5; stats.autoSize = "left"; stats.textColor = 0xFFFFFF; addChild(stats);*/ addEventListener(Event.ENTER_FRAME, render); stage.addEventListener(MouseEvent.MOUSE_DOWN, function(e:MouseEvent):void { mousePressed = true; }); stage.addEventListener(MouseEvent.MOUSE_UP, function(e:MouseEvent):void { mousePressed = false; }); } public function render(e:Event):void { emitter.moveTo(mouseX, mouseY); if (mousePressed) emitter.emitParticles(10); canvas.lock(); canvas.fillRect(canvas.rect, 0x000000); emitter.render(); canvas.unlock(); } } } import flash.display.*; import flash.geom.*; class Emitter { private var position:Vector3D = new Vector3D(); private var velocity:Vector3D = new Vector3D(); private var canvas:BitmapData; private var particles:Vector.<Particle> = new Vector.<Particle>(500, true); private var candicates:uint = 0; public function Emitter(canvas:BitmapData) { this.canvas = canvas; var n:int = particles.length; while (n--) particles[n] = new Particle(canvas); } public function moveTo(x:Number, y:Number):void { velocity.x = (x - position.x) * 0.35; velocity.y = (y - position.y) * 0.35; position.incrementBy(velocity); } public function render():void { var n:int = particles.length; var particle:Particle; while (n--) { particle = particles[n]; if (particle.alive) { particle.render(); } else if (candicates) { candicates--; var p:Vector3D, v:Vector3D; p = position.clone(); p.x += (Math.random() - 0.5) * 5; p.y += (Math.random() - 0.5) * 5; p.z += (Math.random() - 0.5) * 5; v = velocity.clone(); v.x += (Math.random() - 0.5) * 10; v.y += (Math.random() - 0.5) * 10; v.z += (Math.random() - 0.5) * 10; particle.init(p, v); } } } public function emitParticles(n:uint):void { candicates += n; } } class Particle { static private const FLOOR_LEVEL:uint = 360; static private const Z_FAR:uint = 1000; // 画像はあらかじめ全て用意しておく static private const IMAGES:Vector.<BitmapData> = loadImages(); private var position:Vector3D; private var velocity:Vector3D; private var canvas:BitmapData; //private var trail:Vector.<Vector3D>; private var lifeSpan:uint; private var age:uint; private var bounce:uint; private var images:Vector.<BitmapData>; private var matrix:Matrix = new Matrix(); private var transform:ColorTransform = new ColorTransform(); private var point:Point = new Point(); private var rectangle:Rectangle = new Rectangle(); public var alive:Boolean = false; static private function loadImages():Vector.<BitmapData> { var s:Shape = new Shape(); var matrix:Matrix = new Matrix(); matrix.createGradientBox(64, 64); s.graphics.beginGradientFill(GradientType.RADIAL, [0xFFFFFF, 0x11FF00, 0x11FF00], [1, 0.2, 0], [0, 88, 255], matrix); s.graphics.drawCircle(32, 32, 32); s.graphics.endFill(); var images:Vector.<BitmapData> = new Vector.<BitmapData>(64 * 64, true); var transform:ColorTransform = new ColorTransform(); for (var i:int = 0; i < 64; i++) { for (var j:int = 1; j < 64; j++) { var image:BitmapData = new BitmapData(j, j, true, 0x000000); matrix.identity(); matrix.scale(j/64, j/64); transform.blueOffset = i * 4; image.draw(s, matrix, transform); images[int(i * 64 + j)] = image; } } return images; } public function Particle(canvas:BitmapData) { this.canvas = canvas; images = IMAGES; } public function init(p:Vector3D, v:Vector3D):void { position = p; velocity = v; lifeSpan = (Math.random() + 0.5) * 60; age = 0; bounce = 0; alive = true; } public function render():void { var d:Number = position.x + position.y + position.z; velocity.x += Math.cos(d) * 0.5; velocity.y += Math.sin(d) * 0.5 + 0.35; velocity.z += Math.cos(d) * -0.5; if (position.y > FLOOR_LEVEL) { velocity.scaleBy(0.75); velocity.y *= -0.5; bounce++; age += bounce * 3; } else { age++; } position.x += velocity.x; position.y += velocity.y; position.z += velocity.z; //trail.push(position.clone()); if (age < lifeSpan) { var perspective:Number = Z_FAR / (Z_FAR - position.z); var diameter:uint = (lifeSpan - age) * perspective * 0.64; var color:uint = 64 * age / lifeSpan; if (diameter <= 0 || 64 <= diameter) return; if (age < 20) { matrix.tx = position.x * perspective - diameter * 0.5; matrix.ty = position.y * perspective - diameter * 0.5; canvas.draw(images[int(color * 64 + diameter)], matrix, null, BlendMode.LIGHTEN); } else { // draw は重いので copyPixels でごまかす point.x = position.x * perspective - diameter * 0.5; point.y = position.y * perspective - diameter * 0.5; rectangle.width = rectangle.height = diameter; canvas.copyPixels(images[int(color * 64 + diameter)], rectangle, point, null, null, true); } } else { alive = false; } } }