Drawing Colors in a picturebox?

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醉梦人生
醉梦人生 2021-01-25 18:22

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

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  • 2021-01-25 18:48

    If you want to use non-predefined colors, then you need to get a Color object from the static method Color.FromArgb().

    int r = 100;
    int g = 200;
    int b = 50;
    
    Color c = Color.FromArgb(r, g, b);
    
    Brush brush = new SolidBrush(c);
    //...
    

    Best Regards
    Oliver Hanappi

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  • 2021-01-25 18:51

    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.

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  • 2021-01-25 19:01

    You need to specify what it is you would specifically like to draw. You can't draw a red - that makes no sense. You can, however, draw a red rectangle at location (0,0) which is 100 pixels tall and 100 wide. I will answer what I can, however.

    If you want to set the outline of a shape to a specific color, you would create a Pen object. If you want to fill a shape with a color, however, then you would use a Brush object. Here's an example of how you would draw a rectangle filled with red, and a rectangle outlined in green:

    private void pictureBox_Paint(object sender, PaintEventArgs e)
    {
        Graphics graphics = e.Graphics;
    
        Brush brush = new SolidBrush(Color.Red);
        graphics.FillRectangle(brush, new Rectangle(10, 10, 100, 100));
    
        Pen pen = new Pen(Color.Green);
        graphics.DrawRectangle(pen, new Rectangle(5, 5, 100, 100));
    }
    
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