Particle と Attractor の練習
[パーティクルとアトラクタの練習]
* しばらく画面を眺めていると描画されます。
* もう少し処理が軽くならないか試行錯誤中です。
* クリックでリセット。
*
* 参考：
* http://www.tom-carden.co.uk/p5/additive_particles4/applet/index.html
/*
* [パーティクルとアトラクタの練習]
* しばらく画面を眺めていると描画されます。
* もう少し処理が軽くならないか試行錯誤中です。
* クリックでリセット。
*
* 参考：
* http://www.tom-carden.co.uk/p5/additive_particles4/applet/index.html
*/
package {
import flash.display.*;
import flash.geom.*;
import flash.events.*;
import net.hires.debug.Stats;
public class Main extends MovieClip {
private var WIDTH:Number;
private var HEIGHT:Number;
private var _particle:Vector.<Particle>;
private var _attractor:Vector.<Attractor>;
private var _posX:Vector.<Number>;
private var _posY:Vector.<Number>;
private const NUM_PARTICLE:uint = 3500;
private const NUM_ATTRACTOR:uint = 8;
public var damp:Number = 0.00002;
public var accel:Number = 10000;
private var _screen:BitmapData;
private var _canvas:Sprite;
private var _parts:Shape;
private var _rect:Rectangle;
private var rad:Number;
private var dRad:Number;
private var colR:Number, colG:Number, colB:Number;
private var rnd1:int, rnd2:int, rnd3:int;
public function Main():void
{
init();
}
private function init():void
{
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
WIDTH = stage.stageWidth;
HEIGHT = stage.stageHeight;
_screen = new BitmapData( WIDTH, HEIGHT, false, 0x0 );
addChild( new Bitmap(_screen) ) as Bitmap;
_parts = new Shape();
_parts.graphics.beginFill( 0xFFFFFF, 1 );
_parts.graphics.drawCircle( 0, 0, 0.2 );
_rect = new Rectangle(0, 0, 1, 1);
stage.addEventListener( Event.ENTER_FRAME, update );
stage.addEventListener( MouseEvent.CLICK, reset );
stage.addEventListener( Event.RESIZE, resize );
//addChild(new Stats());
Wonderfl.capture_delay(180);
reset();
}
private function reset( e:Event = null ):void
{
//_particle = [];
//_attractor = [];
_particle = new Vector.<Particle>(NUM_PARTICLE, true);
_attractor = new Vector.<Attractor>(NUM_ATTRACTOR, true);
_posX = new Vector.<Number>(NUM_PARTICLE, true);
_posY = new Vector.<Number>(NUM_PARTICLE, true);
rad = 0;
dRad = Math.random()*0.02 + 0.03;
rnd1 = Math.random()+0.5;
rnd2 = Math.random()+0.5;
rnd3 = Math.random()+0.5;
colB = Math.floor( Math.random()*128 + 128 );
colG = Math.floor( Math.random()*( colB * 0.5 ) + colB * 0.105 );
colR = Math.floor( Math.random()*( colG * 0.5 ) + colG * 0.105 );
var color = "0x"+ colR.toString(16) + colG.toString(16) + colB.toString(16);
_screen.fillRect( _screen.rect, 0x0 );
var i:uint;
// init Attractors
for ( i = 0; i < NUM_ATTRACTOR; i++) {
var a:Attractor = new Attractor();
a.x = Math.random()*WIDTH;
a.y = Math.random()*HEIGHT;
_attractor[i] = a;
}
//init Particles
for (i = 0; i < NUM_PARTICLE; i++) {
var p:Particle = new Particle();
p.x = Math.random()*WIDTH;
p.y = Math.random()*HEIGHT;
p.vx = -accel/2 + Math.random()*accel;
p.vy = -accel/2 + Math.random()*accel;
_particle[i] = p;
}
}
private function resize( e:Event = null )
{
stage.removeEventListener( Event.ENTER_FRAME, update );
stage.removeEventListener( MouseEvent.CLICK, reset );
stage.removeEventListener( Event.RESIZE, resize );
init();
}
private function update( e:Event=null ):void
{
updatePos();
}
private function updatePos():void
{
var p:Particle;
var a:Attractor;
var d:Number;
for( var i:uint = 0; i < NUM_PARTICLE; i++ ){
p = _particle[i];
for( var k:uint = 0; k < NUM_ATTRACTOR; k++ ){
a = _attractor[k];
d = Math.pow(a.x-p.x, 2) + Math.pow(a.y-p.y, 2);
if (d > 0.1) {
p.vx += accel * (a.x-p.x) / d;
p.vy += accel * (a.y-p.y) / d;
}
}
p.x += p.vx;
p.y += p.vy;
p.vx *= damp;
p.vy *= damp;
_posX[i] = p.x;
_posY[i] = p.y;
}
draw();
}
private function draw():void
{
var m:Matrix;
var color:ColorTransform = getColor();
_screen.lock();
for( var i:uint = 0; i < NUM_PARTICLE; i++ )
{
m = new Matrix();
m.translate( _posX[i], _posY[i] );
_screen.draw( _parts, m, color, BlendMode.ADD, null, false );
}
_screen.unlock();
}
private function getColor():ColorTransform
{
var r:Number = Math.floor( colB + Math.cos(rad*rnd1*3)*40 );
var g:Number = Math.floor( colG + Math.cos(rad*rnd2*3)*40 );
var b:Number = Math.floor( colR + Math.cos(rad*rnd3*3)*40 );
return new ColorTransform(0, 0, 0, 0.4, r, g, b, 0);
}
}
}
class Particle {
public var x:Number;
public var y:Number;
public var vx:Number;
public var vy:Number;
public function Particle()
{
x = 0;
y = 0;
vx = 0;
vy = 0;
}
}
class Attractor
{
public var x:Number;
public var y:Number;
public function Attractor()
{
x = 0;y = 0;
}
}