绘画事件中的FillPolygon慢吗？

Question

在Winform的绘画事件中，为什么FillPolygon变慢？是因为它计算了应该在三角形内绘制的所有像素？

这是整个应用程序中花费时间最多的部分。因此，我想对其进行优化。

SolidBrush myBrush = new SolidBrush(Color.Black);
MatrixCellZoom zoom = rectangle.CellZoom;
List<Point> points = new List<Point>();
points.Add(zoom.pont1.ToPoint());
points.Add(zoom.pont2.ToPoint());
points.Add(zoom.pont3.ToPoint());

graphics.FillPolygon(myBrush, points.ToArray()); /* the show part */

Answer 1

修订后的答案-与.FillRectangle一样快。至少对于三角形。

        int incr = 1000000;
        using (var bmp = new Bitmap(200, 500))
        using (var gr = Graphics.FromImage(bmp))
        {
            DateTime timeBeforeFillRectangle = DateTime.Now;
            for (int i = 0; i < incr; i++)
            {
                gr.FillRectangle(Brushes.Orange, new Rectangle(0, 0, 100, 300));
            }
            Point[] points = new Point[] { new Point(10, 100), new Point(190, 200), new Point(80, 400) };
            DateTime timeBeforeFillPolygon = DateTime.Now;
            for (int i = 0; i < incr; i++)
            {
                gr.FillPolygon(Brushes.Orange, points);
            }

            TimeSpan ts1 = timeBeforeFillPolygon.Subtract(timeBeforeFillRectangle);
            TimeSpan ts2 = DateTime.Now.Subtract(timeBeforeFillPolygon);

            Console.WriteLine("FillRectangle seconds: " + ts1.TotalSeconds.ToString());
            Console.WriteLine("FillPolygon seconds: " + ts2.TotalSeconds.ToString());
        }
    }