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You can set a specific pixel to a desired color by using a statement like

    SHORT x, y;
    LONG result;
    result = WritePixel(&rastPort, x, y);

WritePixel() uses the primary drawing pen and changes the pixel at that
x,y position to the desired color if the x,y coordinate falls within the
boundaries of the RastPort. A value of 0 is returned if the write was
successful; a value of -1 is returned if x,y was outside the range of the