Actionscript 3 AS3变线曲线

我有我的代码的这一部分，我只需要将它向相反的方向弯曲。 它创建了一条从一个点到向上弯曲的鼠标的直线。我需要把它弯下来。 我将更改哪些值来执行此操作

    if ((mouseX-targetPointX<0 && mouseY-targetPointY>0) || (mouseX-targetPointX>=0 && mouseY-targetPointY<=0))
    {
        if (mouseY-targetPointY>0)
        {
            line.moveTo(mouseX-offset,mouseY-offset);
            line.curveTo(mouseX-offset,targetPointY-offset,targetPointX-offset,targetPointY-offset);
            line.lineTo(targetPointX+offset,targetPointY+offset);
            line.curveTo(mouseX+offset,targetPointY+offset,mouseX+offset,mouseY+offset);
        }
        else
        {
            line.moveTo(mouseX-offset,mouseY-offset);
            line.curveTo(targetPointX-offset,mouseY-offset,targetPointX-offset,targetPointY-offset);
            line.lineTo(targetPointX+offset,targetPointY+offset);
            line.curveTo(targetPointX+offset,mouseY+offset,mouseX+offset,mouseY+offset);
        }
    }
    else
    {
        if (mouseX<targetPointX && mouseY<targetPointY)
        {

            line.moveTo(mouseX-offset,mouseY+offset);
            line.curveTo(targetPointX-offset,mouseY+offset,targetPointX-offset,targetPointY+offset);
            line.lineTo(targetPointX+offset,targetPointY-offset);
            line.curveTo(targetPointX+offset,mouseY-offset,mouseX+offset,mouseY-offset);
        }
        else
        {
            line.moveTo(mouseX-offset,mouseY+offset);
            line.curveTo(mouseX-offset,targetPointY+offset,targetPointX-offset,targetPointY+offset);
            line.lineTo(targetPointX+offset,targetPointY-offset);
            line.curveTo(mouseX+offset,targetPointY-offset,mouseX+offset,mouseY-offset);
        }
    }
    line.endFill();
}

}

if（（mouseX-targetPointX0）| |（mouseX-targetPointX>=0&&mouseY-targetPointY0）
{
line.moveTo（mouseX偏移，mouseY偏移）；
线条曲线图（鼠标X偏移、目标点Y偏移、目标点X偏移、目标点Y偏移）；
line.lineTo（目标点X+偏移，目标点Y+偏移）；
line.curveTo（mouseX+偏移、targetPointY+偏移、mouseX+偏移、mouseY+偏移）；
}
其他的
{
line.moveTo（mouseX偏移，mouseY偏移）；
直线曲线TO（目标点X偏移、鼠标偏移、目标点X偏移、目标点Y偏移）；
line.lineTo（目标点X+偏移，目标点Y+偏移）；
line.curveTo（targetPointX+偏移、mouseY+偏移、mouseX+偏移、mouseY+偏移）；
}
}
其他的
{
如果（mouseX您需要将
curveTo
方法中的控制点更改为前两个参数

curveTo(controlPointX,controlPointY,targetX,targetY);