LabelPlus.PicView.PicView_Draging_MouseMove C# (CSharp) Method

        void PicView_Draging_MouseMove(object sender, MouseEventArgs e)
        {
            if (draging == false) return;

            float dx = e.Location.X - draging_mosuestartpoint.X;
            float dy = e.Location.Y - draging_mosuestartpoint.Y;
            StartP = new PointF(draging_beforeStartP.X - dx/zoom,draging_beforeStartP.Y - dy/zoom);
            Refresh();

            //Console.WriteLine(Math.Abs(dx) +Math.Abs(dy));

            //容忍范围
            if(Math.Abs(dx) +Math.Abs(dy) >= 5.0f)
                alreadyDraged = true;
        }