// If either the colourMapType or the colorMapLength or the interpPoints
// have changed, then recalculate the colourMap
public void UpdateColourMap()
{
lock (locker)
{
double[] pixelPositions = MathHelper.Counter(colorMapLength);
for (int i = 0; i < pixelPositions.Length; ++i)
{
pixelPositions[i] = (pixelPositions[i] - 0.5) / (double)colorMapLength;
}
switch (colourMapMode)
{
case ColourMapMode.RGB:
red.UpdateLinearSplineCoefficients();
green.UpdateLinearSplineCoefficients();
blue.UpdateLinearSplineCoefficients();
double[] interpolatedRed = red.GetValuesLinear(pixelPositions);
interpolatedRed.MultiplyBy(255.0);
double[] interpolatedGreen = green.GetValuesLinear(pixelPositions);
interpolatedGreen.MultiplyBy(255.0);
double[] interpolatedBlue = blue.GetValuesLinear(pixelPositions);
interpolatedBlue.MultiplyBy(255.0);
colourMap = new byte[colorMapLength, 4];
intColourMap = new int[colorMapLength];
for (int i = 0; i < colorMapLength; i++)
{
colourMap[i, 0] = (byte)alphaValue;
colourMap[i, 1] = (byte)interpolatedRed[i];
colourMap[i, 2] = (byte)interpolatedGreen[i];
colourMap[i, 3] = (byte)interpolatedBlue[i];
intColourMap[i] = ((int)interpolatedRed[i] << 16) // R
| ((int)interpolatedGreen[i] << 8) // G
| ((int)interpolatedBlue[i] << 0); // B
}
break;
case ColourMapMode.HSV:
hue.UpdateLinearSplineCoefficients();
saturation.UpdateLinearSplineCoefficients();
value.UpdateLinearSplineCoefficients();
double[] interpolatedHue = hue.GetValuesLinear(pixelPositions);
double[] interpolatedSaturation = saturation.GetValuesLinear(pixelPositions);
double[] interpolatedValue = value.GetValuesLinear(pixelPositions);
colourMap = new byte[colorMapLength, 4];
intColourMap = new int[colorMapLength];
double r = 0, g = 0, b = 0;
for (int i = 0; i < colorMapLength; i++)
{
int hi = (int)(Math.Floor(interpolatedHue[i] * 6));
double f = interpolatedHue[i] * 6 - (double)hi;
double v = interpolatedSaturation[i];
double s = interpolatedValue[i];
double p = v * (1 - s);
double q = v * (1 - f * s);
double t = v * (1 - (1 - f) * s);
switch (hi)
{
case 0:
r = v; g = t; b = p; break;
case 1:
r = q; g = v; b = p; break;
case 2:
r = p; g = v; b = t; break;
case 3:
r = p; g = q; b = v; break;
case 4:
r = t; g = p; b = v; break;
case 5:
r = v; g = p; b = q; break;
}
r *= 255; g *= 255; b *= 255;
colourMap[i, 0] = (byte)alphaValue;
colourMap[i, 1] = (byte)r;
colourMap[i, 2] = (byte)g;
colourMap[i, 3] = (byte)b;
intColourMap[i] = ((int)r << 16) // H
| ((int)g << 8) // S
| ((int)b << 0); // V
}
break;
}
}
}