stage.stageWidth = 560;
stage.stageHeight = 400;

var distance:uint = 900;
//These three paramters are used to control de offset of the normal school
var xOff:Number=0,yOff:Number=-150,zOff:Number=0;

//This is the sprite which is used to draw the normal school
var sprite1:Sprite = new Sprite()
Draw(sprite1);
stage.addChild(sprite1);

//In fact,this sprite has noting to do width this flash,but I just wanna trying some other Drawing APIs,but I used it to let the mouse turn out to be the hand cursor
var sprite2:Sprite = new Sprite();
sprite2.graphics.beginFill(0xffffff,0);
sprite2.graphics.drawRect(0,0,stage.stageWidth,stage.stageHeight);
sprite2.graphics.endFill();
sprite2.buttonMode = true;
stage.addChild(sprite2);

//The following code is used to listen to the three mouseEvent
stage.addEventListener(MouseEvent.MOUSE_DOWN,MouseDownHandler);
stage.addEventListener(MouseEvent.MOUSE_UP,MouseUpHandler);
stage.addEventListener(MouseEvent.MOUSE_WHEEL,MouseWheelHandler);

//The following code is the core of this flash;
function Draw(sprite:Sprite):void 
{
	var x:Number=0,y:Number=300,z:Number=0,zFactor:Number;
	
	//drawing the graphic when set the z to be still
	for(var i:Number=4;i>=-4;i-=0.12)
	{
		z = i*70+stage.stageWidth/2+zOff;
		zFactor = distance/(distance+z);
		
		//The following code is used to set the color of the line ,mainly on red
		var color:uint = Math.round(0xff*zFactor)<<16;
		if(color>0xff0000)
		{
			color = 0xff0000;
		}
		sprite.graphics.lineStyle(1,color,1.0,false,LineScaleMode.NONE,CapsStyle.ROUND,JointStyle.ROUND);
		sprite.graphics.moveTo((-stage.stageWidth/2+xOff)*zFactor,(300+yOff)*zFactor);
		for(var a:Number=-4;a<=4;a += 0.03)
		{
			x = (a*70+xOff)*zFactor;
			y = (300+yOff - (1200*Math.exp(-0.5*(a*a+i*i))/2)/Math.PI)*zFactor;
			sprite.graphics.lineTo(x,y);
		}
	}
	
	//It's important to set this line code ,because the zOff is never unchanged
	zFactor = distance/(distance+zOff);
	
	//The following code is used to drawing the graphic when the x is set to be still
	for(var i:Number=-4;i<=4;i+=0.12)
	{
		x = i*70;
		sprite.graphics.lineStyle(1,0xff0000,1.0,false,LineScaleMode.NONE,CapsStyle.ROUND,JointStyle.ROUND);
		sprite.graphics.moveTo((x+xOff)*zFactor,(300+yOff)*zFactor);
		for(var a:Number=-4;a<=4;a += 0.03)
		{
			z = a*70+stage.stageWidth/2+zOff;
			zFactor = distance/(distance+z);
			
			//The following code is used to set the color of the line ,mainly on red 
			var color:uint = Math.round(0xff*zFactor)<<16;
			if(color>0xff0000)
			{
				color = 0xff0000;
			}
			//Because the color changes with the z cordinate changes
			sprite.graphics.lineStyle(1,color,1.0,false,LineScaleMode.NONE,CapsStyle.ROUND,JointStyle.ROUND);
			tempX = (x+xOff)*zFactor;
			y = (300+yOff - 1200*Math.exp(-0.5*(a*a+i*i))/2/Math.PI)*zFactor;
			sprite.graphics.lineTo(tempX,y);
		}
	}
	sprite.x += stage.stageWidth/2;
	sprite.y += 150;
}

var preMouseX:uint,preMouseY:uint;
function MouseDownHandler(e:MouseEvent):void
{
	preMouseX = e.localX;
	preMouseY = e.localY;
	stage.addEventListener(MouseEvent.MOUSE_MOVE,MouseMoveHandler);
}
function MouseMoveHandler(e:MouseEvent):void
{
	xOff = e.localX - preMouseX;
	yOff = e.localY - preMouseY-150;
	
	//Never forget to recover the sprite in the same place;
	sprite1.graphics.clear();
	sprite1.x -= stage.stageWidth/2;
	sprite1.y -= 150;
	Draw(sprite1);
}
function MouseUpHandler(e:MouseEvent):void
{
	preMouseX = e.localX;
	preMouseY = e.localY;
	stage.removeEventListener(MouseEvent.MOUSE_MOVE,MouseMoveHandler);
}
function MouseWheelHandler(e:MouseEvent):void
{
	zOff += e.delta*10;
	
	//Nevet forget to recover the sprite in the same place;
	sprite1.graphics.clear();
	sprite1.x -= stage.stageWidth/2;
	sprite1.y -= 150;
	Draw(sprite1);
}