Question

使用以下代码在图片框中绘制多个矩形时，它会闪烁我该怎么办呢？

private void drawRect(int sx, int sy, int ex, int ey, int w, int h)
{
    Brush cloud_brush = new SolidBrush(Color.FromArgb(80, Color.Black));
    //Top ok
    pictureBox1.CreateGraphics().FillRectangle(cloud_brush, 0, 0, w, sy);
    //Bottom
    pictureBox1.CreateGraphics().FillRectangle(cloud_brush, 0, ey, w, h);
    //Left ok
    pictureBox1.CreateGraphics().FillRectangle(cloud_brush, 0, sy, sx, ey - sy);
    //Right
    pictureBox1.CreateGraphics().FillRectangle(cloud_brush, ex, sy, w, ey - sy);
}

Answer 1

您正在为每个绘制操作使用CreateGraphics()，但您只需创建一次。 CreateGraphics()很慢，所以这会加速你的代码。

    private void drawRect(int sx, int sy, int ex, int ey, int w, int h)
    {
        using (Graphics g = CreateGraphics())
        using (Brush cloud_brush = new SolidBrush(Color.FromArgb(80, Color.Black)))
        {
            //Top ok
            g.FillRectangle(cloud_brush, 0, 0, w, sy);
            //Bottom
            g.FillRectangle(cloud_brush, 0, ey, w, h);
            //Left ok
            g.FillRectangle(cloud_brush, 0, sy, sx, ey - sy);
            //Right
            g.FillRectangle(cloud_brush, ex, sy, w, ey - sy);
        }
    }

它闪烁的原因是使用CreateGraphics。我建议你改用paint事件。

    private void drawRect(Graphics g, int sx, int sy, int ex, int ey, int w, int h)
    {
        using (Brush cloud_brush = new SolidBrush(Color.FromArgb(80, Color.Black)))
        {
            //Top ok
            g.FillRectangle(cloud_brush, 0, 0, w, sy);
            //Bottom
            g.FillRectangle(cloud_brush, 0, ey, w, h);
            //Left ok
            g.FillRectangle(cloud_brush, 0, sy, sx, ey - sy);
            //Right
            g.FillRectangle(cloud_brush, ex, sy, w, ey - sy);
        }
    }

    private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {
        drawRect(e.Graphics,80, 190, 160, 140, 100, 130);
    }

在图片框上绘制多个矩形时停止闪烁

1 个答案: