Flash AS3基础教程：如何用Flash AS3侦测鼠标的当前方位

var previousX:Number =0;
var previousY:Number = 0;
var currentX:Number = 0;
var currentY:Number = 0;
var xDir:String;
var yDir:String;
var dir:TextField = new TextField();

function getMouseDirection():void
{
dir.width = stage.stageWidth; //文本区域的大小
addChild(dir); //在舞台上添加文本区域
//在舞台上添加一个鼠标事件监听器，并当鼠标运动时执行checkDirection 函数
stage.addEventListener(MouseEvent.MOUSE_MOVE, checkDirection);
}

function
checkDirection(e:MouseEvent):void
{
getHorizontalDirection();
getVerticalDirection();
dir.text = ”x: ” + xDir + ”, y: ” + yDir;
}

//水平方向
function getHorizontalDirection():void
{
previousX = currentX; //检测刚刚的地址
currentX = stage.mouseX; //获取当前的地址
if (previousX > currentX) //将两个地址进行比较来确定方向
{
xDir = “left”;
}
else if (previousX < currentX)
{
xDir = “right”;
}
else
{</p> xDir = “none”;
}
}
//垂直方向 <p></p> function getVerticalDirection():void
{
previousY = currentY; //检测刚刚的地址
currentY = stage.mouseY; //获取当前的地址
if (previousY > currentY) //将两个地址进行比较来确定方向
{
yDir = “up”;
}
else if (previousY < currentY)
{
yDir = “down”;
}
else
{ <p></p> <p>yDir = “none”;
}
}

getMouseDirection();

package
{
import flash.display.MovieClip;
import flash.text.TextField;</p> <p>public class MouseMoveDemo extends MovieClip
{
public var previousX:Number = 0;
public var previousY:Number = 0;
public var currentX:Number = 0;
public var currentY:Number = 0;
public var xDir:String;
public var yDir:String;
public var dir:TextField = new TextField();
public function MouseMoveDemo()
{
getMouseDirection();
}</p> <p>public function getMouseDirection():void</p> <p>{
dir.width = stage.stageWidth;
addChild(dir);
stage.addEventListener(MouseEvent.MOUSE_MOVE, checkDirection);
}
public function
checkDirection(e:MouseEvent):void
{
getHorizontalDirection();
getVerticalDirection();
dir1.text = “x: ” + xDir
dir2.text = “y: ” + yDir;
}
public function getHorizontalDirection():void
{
previousX = currentX;
currentX = stage.mouseX;<
if (previousX > currentX)
{
xDir = “left”;
}
else if (previousX < currentX)
{
xDir = “right”;
}
else
{
xDir = “none”;
}
}
public function getVerticalDirection():void
{
previousY = currentY;
currentY = stage.mouseY;
if (previousY > currentY)
{
yDir = “up”;
}
else if (previousY < currentY)
{
yDir = “down”;
}
else
{
yDir = “none”;
}
}
}
}

var mouseMoveDemo:MouseMoveDemo= new MouseMoveDemo();
addChild( mouseMoveDemo );