Drawing Colors in a picturebox?

Question

In C# i have a picturebox. i would like to draw 4 colors. The default will be white, red, green, blue. How do i draw these 4 colors stritched in this picbox? or should i have 4

Answer 1

Add a PictureBox to the form, create an event handler for the paint event, and make it look like this:

private void PictureBox_Paint(object sender, PaintEventArgs e)
{
    int width = myPictureBox.ClientSize.Width / 2;
    int height = myPictureBox.ClientSize.Height / 2;

    Rectangle rect = new Rectangle(0, 0, width, height);
    e.Graphics.FillRectangle(Brushes.White, rect);
    rect = new Rectangle(width, 0, width, height);
    e.Graphics.FillRectangle(Brushes.Red, rect);
    rect = new Rectangle(0, height, width, height);
    e.Graphics.FillRectangle(Brushes.Green, rect);
    rect = new Rectangle(width, height, width, height);
    e.Graphics.FillRectangle(Brushes.Blue, rect);
}

This will divide the surface into 4 rectangles and paint each of them in the colors White, Red, Green and Blue.