///283,191            Bitmap bmp = new Bitmap(pictureBox1.Image);//创建Bitmap对象            using (Graphics g = pictureBox2.CreateGraphics())            {                g.Clear(pictureBox1.BackColor);                Point p1 = new Point(0, 0);                Point p2 = new Point(220, 0);                Point p3 = new Point(70, 180);                ///三点定义一个平行四边形                Point[] p = { p1, p2, p3 };                g.DrawImage(bmp, p);            }