Flash螺旋效果 .

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先来看看图片讲解的公式

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数学公式：

X=cosA*R;

y=sinA *R;

Z+=H;

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转化为屏幕投影的公式：

X=cosA*R;

Z=sinA *R;

Y+=H;

以下是源码(可调整参数变量，实现不同的视觉效果)：

package  
{
	import flash.display.MovieClip;
	import flash.events.*;
	import flash.geom.PerspectiveProjection;
	[SWF(width = "700",height = "480",frameRate = "25")];
	/**
	 * ...
	 * @author .....Li灬Star 
     * @contact...QQ:168527720 
     */
	
	public class LuoXuan extends MovieClip
	{
		private var pointNum:int = 50; //螺旋点的数目
		private var rotationNum:int = 3; //螺旋的圈数
		private var anglePer:Number; //旋转的弧度
		private var radius:Number = 200; //半径
		private var _height:Number = 0; //高度
		private var imgArr:Array = new Array();
		private var container:MovieClip = new MovieClip();
		
		public function LuoXuan() 
		{
		    init();
		}
		
		private function init():void {
		    root.transform.perspectiveProjection.fieldOfView = 50; //初始化透视角度
			this.addChild(container);
			container.x = stage.stageWidth / 2;
			container.y = stage.stageHeight / 2 - 500;
			container.z = 1000;
			setObject3D();
		}
		
		private function setObject3D():void {
		    anglePer = ((2 * Math.PI) * rotationNum) / pointNum;
			for (var i:int = 0; i < pointNum; i++ ) {
			    var img:Image = new Image();
				imgArr.push(img);
				container.addChild(img);
				img.x = Math.cos(anglePer * i) * radius;
				img.z = Math.sin(anglePer * i) * radius;
				img.y = _height += 30; //每张图片的高度递增30
				img.rotationY = ( -i * anglePer) * (180 / Math.PI) + 90; //偏移角度，弧度转换为度
				img.addEventListener(Event.ENTER_FRAME,enterFrameHandler);
			}
		}
		
		private function enterFrameHandler(e:Event):void {
		    container.rotationY+=0.01;  
            sortZ(); //Z轴排序	
		}
		
		private function sortZ():void {
		    imgArr.sortOn("z",Array.CASEINSENSITIVE | Array.NUMERIC);
			for (var i:int = 0; i < imgArr.length; i++) {
			    var imgCopy:Image = imgArr[i];
				container.setChildIndex(imgCopy,i);
			}
		}
	}

}