forked from: BitmapDataSample11
// forked from nutsu's BitmapDataSample11
// forked from nulldesign's Liquid10000
package {
import flash.display.Sprite;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.ColorTransform;
import flash.display.BitmapDataChannel;
import flash.filters.BlurFilter;
import flash.events.Event;
import flash.events.MouseEvent;
[SWF(width=465,height=465,backgroundColor=0,frameRate=60)]
public class BitmapDataSample11 extends Sprite {
private var bmpdata:BitmapData;
private var colortrans:ColorTransform;
private var filter:BlurFilter;
private var vectormap:BitmapData;
private var particles:Array;
private var particle_number:uint = 25000;
private var size:Number = 465;
public function BitmapDataSample11() {
//BitmapDataを作成して表示リストに追加
bmpdata = new BitmapData( size, size, false, 0 );
addChild( new Bitmap( bmpdata ) );
//エフェクト初期化
colortrans = new ColorTransform( 2, 2, 0.99 );
filter = new BlurFilter( 2, 2, 1 );
//ベクトルマップとパーティクルの初期化
vectormap = new BitmapData( size, size, false, 0 );
reset();
//イベント
addEventListener( Event.ENTER_FRAME, enterframe );
stage.addEventListener( MouseEvent.CLICK, reset );
}
private function reset( e:MouseEvent = null ):void {
//ベクトルマップの初期化
var randomSeed:int = Math.random()*0xFFFFFFFF;
var colors:uint = BitmapDataChannel.RED | BitmapDataChannel.GREEN;
vectormap.perlinNoise( size/2, size/2, 4, randomSeed, false, true, colors );
//パーティクルの初期化
particles = new Array(particle_number);
for (var i:int = 0; i < particle_number; i++) {
particles[i] = new Particle( Math.random()*size, Math.random()*size );
}
}
private function enterframe( e:Event ):void {
//エフェクトの適用
bmpdata.applyFilter( bmpdata, bmpdata.rect, bmpdata.rect.topLeft, filter );
bmpdata.colorTransform( bmpdata.rect, colortrans );
//パーティクルの描画
bmpdata.lock();
for (var i:int = 0; i <particle_number; i++) {
var p:Particle = particles[i];
//ベクトルマップのPixel値から加速度を算出
var col:uint = vectormap.getPixel( p.x, p.y );
p.ax += ( (col >> 16 & 0xff) - 128 )*0.0005;
p.ay += ( (col >> 8 & 0xff) - 128 )*0.0005;
//加速度から速度と位置を算出
p.x += p.vx += p.ax;
p.y += p.vy += p.ay;
if ( p.x > size ) { p.x -= size; }
else if ( p.x < 0 ){ p.x += size; }
if ( p.y > size ) { p.y -= size; }
else if ( p.y < 0 ){ p.y += size; }
//Pixelへ描画
bmpdata.setPixel( p.x, p.y, 0xffffff );
//加速度と速度の減衰
p.ax *= 0.96; p.ay *= 0.96;
p.vx *= 0.92; p.vy *= 0.92;
}
bmpdata.unlock();
}
}
}
//パーティクルクラス
class Particle {
//位置
public var x:Number;
public var y:Number;
//加速度
public var ax:Number = 0;
public var ay:Number = 0;
//速度
public var vx:Number = 0;
public var vy:Number = 0;
function Particle( px:Number, py:Number ) {
x = px;
y = py;
}
}