如何在C＃中的图片框上绘制时避免图形对象的闪烁？

Question

我不擅长C＃中的图形绘图。我试图在PictureBox中的图像上进行矩形点的动画绘制。但是，我面临着一些闪烁的问题，我无法找到方向;如何解决这个问题。

g = pictureBox1.CreateGraphics();
g.FillRectangle(Brushes.Green, Convert.ToInt32(x), Convert.ToInt32(y), 10, 10);

Thread.Sleep(20);
invalidate_pictureBox1();
update_pictureBox1();    

我从其他论坛上研究过这个问题可以通过Timer而不是Thread睡眠来解决，但不知道该怎么做。

Answer 1

在PictureBox的Image中绘制你想要的内容，而不是在PictureBox控件上绘制：

    private void timer1_Tick(object sender, EventArgs e)
    {
        Image img = new Bitmap(width, height);
        Graphics g = Graphics.FromImage(img);
        g.FillRectangle(Brushes.Green, Convert.ToInt32(x), Convert.ToInt32(y), 10, 10);
        pictureBox1.Image = img;
    }

修改

如果您想在没有闪烁的情况下绘制PictureBox控件，请将您的绘图放在pictureBox1.Paint事件上，如下所示：

    private void Form1_Load(object sender, EventArgs e)
    {
        // Your Solution
        int x = 0, y = 0;
        pictureBox1.Paint += new PaintEventHandler(delegate(object sender2, PaintEventArgs e2)
        {
            e2.Graphics.FillRectangle(Brushes.Green, x, y, 10, 10);
        });

        // Test
        buttonTest1.Click += new EventHandler(delegate(object sender2, EventArgs e2)
        {
            x++;
            pictureBox1.Invalidate();
        });

        buttonTest2.Click += new EventHandler(delegate(object sender2, EventArgs e2)
        {
            for (x = 0; x < pictureBox1.Width - 10; x++)
            {
                System.Threading.Thread.Sleep(50);
                pictureBox1.Invalidate();
                pictureBox1.Refresh();
            }
        });

        buttonTest3.Click += new EventHandler(delegate(object sender2, EventArgs e2)
        {
            System.Windows.Forms.Timer t = new System.Windows.Forms.Timer();
            t.Tick += new EventHandler(delegate(object sender3, EventArgs e3)
            {
                if (x <= pictureBox1.Width - 10)
                    x++;
                pictureBox1.Invalidate();
            });
            t.Enabled = true;
            t.Interval = 50;
        });
    }