颜色条的简单实现

private void Form1_Paint(object sender, PaintEventArgs e)

{

Graphics g1 = e.Graphics;

int index = 0;

int r = 0, g = 0, b = 0;

for (g = 0; g < 256; g++)

{

b = 255 - g;

Color c = Color.FromArgb(r, g, b);

g1.DrawLine(new Pen(c), new Point(index, 0), new Point(index, 100));

index++;

}

b = 0;

for (g = 255; g > -1; g--)

{

r = 255 - g;

Color c = Color.FromArgb(r, g, b);

g1.DrawLine(new Pen(c), new Point(index, 0), new Point(index, 100));

index++;

}

}

效果：