Particles
Processingライクに描画するメインクラス
package {
import flash.display.*;
import flash.events.*;
import flash.geom.*;
import flash.utils.*;
/**
* Processingライクに描画するメインクラス
*/
public class Particles extends Sprite {
var canvas:BitmapData;
var particleClasses:Array = [Particle,Particle2];
var particleClass:Class;
var particles:Array;
const numParticles:uint = 100;
/**
* コンストラクタ
*/
public function Particles() {
setUp();
}
/**
* 初期化
*/
public function setUp():void {
canvas = new BitmapData( stage.stageWidth, stage.stageHeight, true, 0xFFFFFFFF );
addChild( new Bitmap( canvas ) );
particles = new Array();
for( var i:int=0; i<numParticles; i++ ){
particleClass = particleClasses[ i % 2 ];
var _:Particle = new particleClass( stage ) as Particle;
_.p.x = Math.random() * stage.stageWidth;
_.p.y = Math.random() * stage.stageHeight;
_.v.x = Math.random() * 2 - 1;
_.v.y = Math.random() * 2 - 1;
particles.push(_);
}
addEventListener( Event.ENTER_FRAME, draw );
stage.addEventListener( MouseEvent.MOUSE_DOWN, mouseHandle );
stage.addEventListener( MouseEvent.MOUSE_UP, mouseHandle );
}
/**
* 描画処理
* @param event
*/
public function draw( event:Event ):void {
canvas.draw( canvas, null, new ColorTransform( 0, 0, 0, 0, 0xFF, 0xFF, 0xFF, 0xFF * .2 ),null,null,false);
particles.forEach(
function( particle:Particle, index:int, array:Array ){
particle.move();
particle.render( canvas );
}
);
}
/**
* マウスイベントハンドル
* @param event
*/
public function mouseHandle( event:MouseEvent ):void {
switch( event.type ){
case MouseEvent.MOUSE_DOWN:
particles.forEach(
function( particle:*, index:int, array:Array ){
particle.isPressed = true;
}
);
break;
case MouseEvent.MOUSE_UP:
particles.forEach(
function( particle:*, index:int, array:Array ){
particle.isPressed = false;
}
);
break;
}
}
}
}
import flash.display.*;
import flash.geom.*;
/**
* 粒子の実装定義インターフェイス
*/
interface IParticle {
function move():void;
function render( canvas:BitmapData ):void;
}
/**
* 粒子クラス
*/
class Particle implements IParticle {
var subject:DisplayObject;
var stage:Stage;
var isPressed:Boolean;
/**
* 座標
*/
var p:Point = new Point();
/**
* 移動ベクトル
*/
var v:Point = new Point();
/**
* 色
*/
var col:ColorTransform;
/**
* 拡大率
*/
var scale:Number = 1;
/**
* 回転角（ラジアン）
*/
var rotation:Number = 0;
/**
* コンストラクタ
* @param _stage
*/
public function Particle( _stage:Stage ) {
if( !subject )
subject = getSubject();
stage = _stage;
col = new ColorTransform( 0, 0, 0, 0, Math.random() * 0xFF, 0x00, 0x64, Math.random() * 0x66 );
}
/**
* 移動処理
*/
public function move():void {
v.x += Math.random() * 2 - 1;
v.y += Math.random() * 2 - 1;
v.x *= 0.99;
v.y *= 0.99;
if( isPressed ){
var t:Point = new Point( stage.mouseX, stage.mouseY );
t = t.subtract(p);
t.normalize(v.length);
v = t;
}
p = p.add(v);
rotation = Math.atan2( v.y, v.x );
modifyPositoin();
var distance:Number = Point.distance( new Point( stage.mouseX, stage.mouseY ), p );
var maxDistance:Number = Point.distance( new Point(), new Point( stage.stageWidth, stage.stageHeight ) );
scale = 10 * distance / maxDistance + .1;
}
/**
* 描画処理
* @param canvas
*/
public function render( canvas:BitmapData ):void{
var matrix:Matrix = new Matrix();
matrix.rotate( rotation );
matrix.scale( scale, scale );
matrix.translate( p.x, p.y );
canvas.draw( subject, matrix, col);
};
/**
* 画面をはみ出た場合の処理
*/
private function modifyPositoin():void {
// 画面をはみ出たら跳ね返る処理
p.x = ( p.x < 0 ) ? 0 : ( p.x > stage.stageWidth ) ? stage.stageWidth : p.x;
p.y = ( p.y < 0 ) ? 0 : ( p.y > stage.stageHeight ) ? stage.stageHeight : p.y;
v.x *= ( p.x == 0 || p.x == stage.stageWidth ) ? -1 : 1;
v.y *= ( p.y == 0 || p.y == stage.stageHeight ) ? -1 : 1;
}
/**
* 描画する主題を生成
* @return
*/
protected function getSubject():DisplayObject {
var sp:Shape = new Shape();
sp.graphics.beginFill( 0xFFFFFF );
sp.graphics.drawRect( -1, 0, 3, 1 );
sp.graphics.drawRect( 0, -1, 1, 3 );
sp.graphics.drawRect( 0, 0, 1, 1 );
return sp as DisplayObject;
}
}
/**
* 粒子クラス2
*/
class Particle2 extends Particle {
/**
* コンストラクタ
* @param _stage
*/
public function Particle2( _stage:Stage ){
super( _stage );
}
/**
* 描画する主題を生成
* @return
*/
override protected function getSubject():DisplayObject {
var sp:Shape = new Shape();
sp.graphics.beginFill( 0xFFFFFF );
sp.graphics.drawCircle(0,0,1.5);
return sp as DisplayObject;
}
}