伪园角窗口坐标

    int w = this->Width;
    int h = this->Height;
    
    gdip::PointF borderData[]={
                gdip::PointF(5,0),
                gdip::PointF(w - 5,0),
                gdip::PointF(w - 1,5),
                gdip::PointF(w - 1,h - 5),
                gdip::PointF(w - 5,h - 1),
                gdip::PointF(5,h - 1),
                gdip::PointF(0,h - 5),
                gdip::PointF(0,5),
                gdip::PointF(5,0)};