COCOS 3d 如何在鼠标中键一直按下的时候，获得鼠标的位置，谢谢~

@flybin 写道：

cocos 3d 如何在一直按下鼠标中键的时候，获得鼠标的位置，想做相机随着鼠标进行移动，谢谢~

cocos 3d代码：

update(deltaTime: number){
if (this.isMOUSE_WHEEL)
{ cc.log("鼠标中键按下");cc.log(this.MOUSE_WHEELLocationX,this.MOUSE_WHEELLocationY,this.PreMouseMPosX);

        if (this.PreMouseMPos.x <= 0)
         {
            this.PreMouseMPos = new Vec3(this.MOUSE_WHEELLocationX,this.MOUSE_WHEELLocationY, 0.0);
         }
         else
         {
            var CurMouseMPos:Vec3  = new Vec3(this.MOUSE_WHEELLocationX,this.MOUSE_WHEELLocationY, 0.0);

            var offset:Vec3  = new Vec3(CurMouseMPos.x - this.PreMouseMPos.x,CurMouseMPos.y - this.PreMouseMPos.y,CurMouseMPos.z - this.PreMouseMPos.z);

            offset =new Vec3(-offset.x * 10,-offset.y * 10,-offset.z * 10) ;//0.1这个数字的大小可以调节速度

            this.node.translate(offset);
            
            this.PreMouseMPos = CurMouseMPos;


         }
     }
     else
     {
       // this.PreMouseMPosX = 0;
     }

}

//鼠标中键按下，上下左右移动相机
onMOUSE_DOWN(event: EventMouse)
{
//鼠标中键按下，上下左右移动相机
if (event.getButton() === 1)
{
this.MOUSE_WHEELLocationX= event.getLocationX();
this.MOUSE_WHEELLocationY =event.getLocationY();

        this.isMOUSE_WHEEL=true;
     }


}

一直按下的鼠标中键的时候，移动鼠标，event.getLocationX();的值不进行变化，求指导，谢谢~

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