Custom color array into Bitmap

[Oscee]

Hi everyone!

I've read several Bitmap-related threads but haven't find a solution.

I am working on a raytracer program. I have an array of "custom color" objects - the color class basically contains only the RGBA values and a couple of overloaded operators.

I would like to display this array on a PictureBox - what would be the easiest way to convert my structure to a Bitmap?

(I know, this array-thingy doesn't look like to be an optimal solution, the whole thing is based on an old C-OpenGl code of mine, later I would like tho replace everything with generic lists)

[ThatThatGuy]

PictureBox.Back Color =Color.FromArgb (100,125,152);


the backcolor applies to picturebox if there's no image over it

[Curtis Rutland]

Ok, assuming that there is some logical way your array is tied to coordinates, it's fairly easy:

Make sure to include a reference to System.Drawing.

Create a new Bitmap object, and provide it dimensions:

Bitmap bmp = new Bitmap(100, 100);

Then, depending on how your array is mapped to the coordinates, loop through it and assign each pixel. This example assumes a single dimensional array, starting from 0,0 (top left), proceeding to fill first down, then to the left.

for (int i = 0; i < 100; i++)
    for (int j = 0; j < 100; j++)
        bmp.SetPixel(i, j, Color.FromArgb(a, r, g, b));

a, r, g, and b, should all be ints that map to the alpha, red, green, and blue values.

Once you have constructed your bitmap, assign it as the picturebox's image property:

pictureBox1.Image = bmp;

That should do it.

[Curtis Rutland]

Just as a little p.s.:

I only learned how to do this bitmap stuff for a neat little project I heard about that is to design an image containing all possible RGB values, with no two colors repeated. Here's what I came up with:

Bitmap bmp = new Bitmap(4096, 4096);
int r = 0, g = 0, b = 0;
bool rRev = false, gRev = false, bRev = false;
for (int i = 0; i < 4096; i++)
{
    for (int j = 0; j < 4096; j++)
    {
        bmp.SetPixel(i, j, Color.FromArgb(r, g, b));
        r = rRev ? r - 1 : r + 1;
        if (r >= 255)
        {
            rRev = true;
            g = gRev ? g - 1 : g + 1;
            if (g >= 255)
            {
                gRev = true;
                b = bRev ? b - 1 : b + 1;
                if (b >= 255)
                    bRev = true;
                if (b <= 0)
                    bRev = false;
            }
            if (g <= 0)
            {
                gRev = false;
                b = bRev ? b - 1 : b + 1;
                if (b >= 255)
                    bRev = true;
                if (b <= 0)
                    bRev = false;
            }

        }
        if (r <= 0)
        {
            rRev = false;
            g = gRev ? g - 1 : g + 1;
            if (g >= 255)
            {
                gRev = true;
                b = bRev ? b - 1 : b + 1;
                if (b >= 255)
                    bRev = true;
                if (b <= 0)
                    bRev = false;
            }
            if (g <= 0)
            {
                gRev = false;
                b = bRev ? b - 1 : b + 1;
                if (b >= 255)
                    bRev = true;
                if (b <= 0)
                    bRev = false;
            }
        }

    }
}
FileStream fs = new FileStream(@"c:\dev\temp.png", FileMode.Create);
Console.WriteLine("Writing File");
bmp.Save(fs, ImageFormat.Png);
fs.Flush();
fs.Close();
Console.WriteLine("Done");

[Oscee]

Thank you!
It is easier than I thought it would be. It seems that I had problems with the raytracing itself than the displaying after all :)

[Curtis Rutland]

Glad I could help.