Oaxoa Blog

import caurina.transitions.Tweener;
import com.oaxoa.components.FrameRater;
import flash.events.KeyboardEvent;
 
var particles:Array=[];
var particlesXY:Array=[];
var flen:Number=100;
var lines:Sprite=new Sprite();
var renderLines:Boolean=false;
var shapeN:int=-1;
 
var camera:Object={px:0, py:0, pz:0};
 
function drawBg():void {
	var bg:Sprite=new Sprite();
	bg.graphics.beginFill(0x333333);
	bg.graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
	bg.graphics.endFill();
	addChild(bg);
	var tf:TextFormat=new TextFormat();
	tf.color= 0x999999;
	tf.font="_sans";
	tf.size=11;
	tf.align="right";
	var t:TextField=new TextField();
	t.width=300;
	t.defaultTextFormat=tf;
	t.text="Press SPACEBAR to change particles shape";
	t.x=stage.stageWidth-t.width-10;
	t.selectable=false;
	bg.addChild(t);
}
 
function addParticle(x:Number, y:Number, z:Number):void {
	var p:MovieClip=new MovieClip();
	p.graphics.beginFill(0xcccccc);
	p.graphics.drawCircle(0, 0, 5);
	p.graphics.endFill();
	p.px=x;
	p.py=y;
	p.pz=z;
	particles.push(p);
}
 
function cycleShape():void {
	if (shapeN<3) {
		shapeN++;
	} else {
		shapeN=0;
	}
	var i:uint;
	var p:MovieClip;
	var px:Number;
	var py:Number;
	var pz:Number;
	var arad:Number;
	if (shapeN==0) {
		var a:Number=0;
		for (i=0; i<particles.length; i++) {
			a+=9;
			a%=360;
			p=particles[i];
			arad=a/180*Math.PI;
			px=Math.cos(arad)*100;
			py=Math.sin(arad)*100;
			pz=Math.floor(i/40)*60;
			Tweener.addTween(p, {time:2, transition:"EaseInOutCubic", px:px, py:py, pz:pz, delay:i/300});
		}
	} else if (shapeN==1) {
		for (i=0; i<particles.length; i++) {
			p=particles[i];
			arad=i/180*Math.PI;
			arad*=2;
			px=Math.sin(arad)*100;
			py=Math.cos(arad)*100;
			pz=i;
			Tweener.addTween(p, {time:2, transition:"EaseInOutElastic", px:px, py:py, pz:pz, delay:i/300});
		}
	} else if (shapeN==2) {
		for (i=0; i<particles.length; i++) {
			p=particles[i];
			px=Math.random()*700-350;
			py=Math.random()*700-350;
			pz=Math.random()*1700;
			Tweener.addTween(p, {time:2, transition:"EaseInOutCubic", px:px, py:py, pz:pz, delay:i/200});
		}
	} else if (shapeN==3) {
		var row:uint=0;
		var col:uint=0;
		for (i=0; i<particles.length; i++) {
			col=(i%50);
			row=Math.floor(i/50);
			p=particles[i];
			px=0
			py=-450+row*40;
			pz=col*40;
			Tweener.addTween(p, {time:2, transition:"EaseInOutBounce", px:px, py:py, pz:pz, delay:i/200});
		}
	}
}
 
 
function render():void {
 
	var c:uint=0;
	for each (var p:MovieClip in particles) {
		var dx:Number=p.px-camera.px;
		var dy:Number=p.py-camera.py;
		var dz:Number=p.pz-camera.pz;
		var scale:Number=flen/(flen+(dz));
		if (scale<0) {
			scale=0;
		}
		p.x=stage.stageWidth/2+dx*scale;
		p.y=stage.stageHeight/2+dy*scale;
		p.scaleX=p.scaleY=scale;
		particlesXY[c]={x:p.x, y:p.y, scale:scale};
		c++;
	}
	// activate lines render, false by default, not really a wireframe
	if (renderLines) {
		lines.graphics.clear();
		lines.graphics.lineStyle(2, 0xCCCCCC);
		for(var i:uint=0; i<particlesXY.length; i++) {;
			var t:Object=particlesXY[i];
			if (i<particlesXY.length-1 && t.scale>0) {
				var t2:Object=particlesXY[i+1];
 
				lines.graphics.moveTo(t.x, t.y);
				lines.graphics.lineTo(t2.x, t2.y);
			}
		}
	}
}
 
stage.addEventListener(KeyboardEvent.KEY_UP, onkey);
function onkey(event:KeyboardEvent):void {
	if(event.keyCode==32) {
		cycleShape();
		render();
	}
}
addEventListener(Event.ENTER_FRAME, onframe);
 
function onframe(event:Event):void {
	var offx:Number=stage.stageWidth/2-mouseX;
 
	camera.px-=offx/5;
	if (camera.px>150) {
		camera.px=150;
	}
	if (camera.px<-150) {
		camera.px=-150;
	}
	var offy:Number=stage.stageHeight/2-mouseY;
	if(offy>70) offy=70;
	if(offy<-70) offy=-70;
 
	camera.pz+=offy/5;
	if (camera.pz>1700) {
		camera.pz=1700;
	}
	if (camera.pz<0) {
		camera.pz=0;
	}
	render();
}
 
function addSprites():void {
	for each (var p:MovieClip in particles) {
		addChildAt(p, 1);
	}
}
 
function init():void {
	for(var i:uint=0; i<1200; i++) {
		var px:Number=0;
		var py:Number=0;
		var pz:Number=0;
		addParticle(px, py ,pz);
	}
}
 
// main methods call
drawBg();
addChild(lines);
init();
addSprites();
cycleShape();
render();
var fr:FrameRater=new FrameRater(0xffffff);
addChild(fr);