WPF Color interpolation

Question

I am trying to paint a WPF control\'s background based on a palette where each color has been assigned with values (e.g. Red = 0, DarkGreen = 10, Green = 20,LightGreen =30)

Answer 1

Using the LinearGradientBrush sounds like it would have a bit of an overhead. No knowledge though. A color interpolation function isn't that hard to write though.

I'm assuming your palettes have values that are divisible by 10 for simplicity.

public static Color GetColor(int value)
{
    int startIndex = (value/10)*10;
    int endIndex = startIndex + 10;

    Color startColor = Palette[startIndex];
    Color endColor = Palette[endIndex];

    float weight = (value - startIndex)/(float)(endIndex - startIndex);

    return Color.FromArgb(
        (int)Math.Round(startColor.R * (1 - weight) + endColor.R * weight),
        (int)Math.Round(startColor.G * (1 - weight) + endColor.G * weight),
        (int)Math.Round(startColor.B * (1 - weight) + endColor.B * weight));

}

If the defined colors are not divisible by 10 the logic to find the start and end colors will be a bit more complex.