I thought this might belong here..

[chemicalNova]

Howdy all,

My question is to do with programming, specifically LockBits on the .NET framework.

I'm working with a single dimensional array, representing a picture. The array is structured, so the first 3 elements have the r g and b values of the first pixel, the 4th, 5th and 6th elements have the r g and b values of the second pixel, and so on. The pixels are stored by rows (not columns).

I'm trying to write a "SetPixel" function using this. What I have so far is this:

private void SetPixel(int x, int y, byte r, byte g, byte b, ref byte[] rgbValues, int Width)
{
    int px = (((y * Width) * 3) + (x * 3));
    rgbValues[px] = b;
    rgbValues[px++] = g;
    rgbValues[px++] = r;
} 

This however, doesn't seem to work. It works in the sense that no error occur, but if I use this:

SetPixel(320, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(321, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(322, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(323, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(324, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(325, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(326, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(327, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(328, y, 0, 0, 0, ref rgbValues, Width);
SetPixel(329, y, 0, 0, 0, ref rgbValues, Width); 

... there are gaps between the plotted pixels, both horizontally and vertically.



My question to you is:

How would I correctly calculate where to place the pixels in the setpixel function? Nothing I seem to try works and its starting to make my head explode (slowly ). If anyone has an answer I would be very appreciative.

Thanks in advance,

chem