color gradient table generator (for grahpviz)

[arnaud-m]

Here two code example that could help to implement such a feature.
From http://stackoverflow.com/questions/2011832/generate-color-gradient-in-c-sharp

public IEnumerable<Color> GetGradients(Color start, Color end, int steps)
{
    Color stepper = Color.FromArgb((byte)((end.A - start.A) / (steps - 1)),
                                   (byte)((end.R - start.R) / (steps - 1)),
                                   (byte)((end.G - start.G) / (steps - 1)),
                                  (byte)((end.B - start.B) / (steps - 1)));
for (int i = 0; i < steps; i++)
    {
        yield return Color.FromArgb(start.A + (stepper.A * i),
                                    start.R + (stepper.R * i),
                                    start.G + (stepper.G * i),
                                    start.B + (stepper.B * i));
    }
}

in php, http://www.herethere.net/~samson/php/color_gradient/.