forked from: 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
import com.flashdynamix.utils.SWFProfiler;
/**
* Copyright gyo ( http://wonderfl.net/user/gyo )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/fZWt
*/
// forked from alpicola'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="40")]
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, 0xFF0000, 0xFF0000], [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;
}
}
}