Question

flash as3 代码画线问题，有a b两点，鼠标可拖动a点移动，过程中实时显示ab线段

如果只是水平移动a呢，不能用StartDrag了，怎么办？

Answer 1

var shape:Shape=new Shape();//定义画线容器

var temp_x:Number=0;//记录也鼠标的相对坐标

this.addChild(shape);

this.addEventListener(Event.ENTER_FRAME,DrawLineEvent);//帧频事件，用于画线

function DrawLineEvent(e:Event):void

{

shape.graphics.clear();//画线前先清空之前画的内容

shape.graphics.lineStyle(1, 0x000000);//定义线的宽度和颜色

shape.graphics.moveTo(a_mc.x,a_mc.y);

shape.graphics.lineTo(b_mc.x,b_mc.y);

shape.graphics.endFill();

}

a_mc.addEventListener(MouseEvent.MOUSE_DOWN,StartDragEvent);//添加鼠标拖动的功能

a_mc.addEventListener(MouseEvent.MOUSE_UP,StopDragEvent);

b_mc.addEventListener(MouseEvent.MOUSE_DOWN,StartDragEvent);

b_mc.addEventListener(MouseEvent.MOUSE_UP,StopDragEvent);

function StartDragEvent(e:MouseEvent):void

{

var obj:Object=e.currentTarget;

temp_x=this.mouseX-obj.x;

obj.addEventListener(Event.ENTER_FRAME,FollowMouseEvent);

}

function StopDragEvent(e:MouseEvent):void

{

var obj:Object=e.currentTarget;

obj.removeEventListener(Event.ENTER_FRAME,FollowMouseEvent);

}

function FollowMouseEvent(e:Event):void

{

var obj:Object=e.target;

obj.x=this.mouseX-temp_x;//通过相对坐标计算

}

追问

好了，谢谢

追答

不客气