Draw filled rectangle on transparent form

Vote count:

0

I have a form with opacity set to 0. How would I be able to paint a filled rectangle inside that form, that is 50% transparent ?

//transparency at 128 (50%)
SolidBrush brush1 = new SolidBrush(Color.FromArgb(128, 100, 100, 100));

private void Form1_Paint(object sender, PaintEventArgs e)
{
    e.Grapics.FillRectangle(brush1, rectangle1);
}

If I paint using e.Graphics,nothing is drawn on the screen, since the form's opacity is 0.

I tried drawing using Graphics g = Graphics.FromHwnd(IntPtr.Zero); but it is so slow, that is absolutely ineffective.

asked 35 secs ago

Shiro

697

Draw filled rectangle on transparent form