/// <summary>
/// Returns the color for a 3scale color formatting.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="min">The minimum.</param>
/// <param name="max">The maximum.</param>
/// <param name="par">The 3color parameters.</param>
/// <returns></returns>
public static Color ConvertThreeRange(double value, double min, double max, ThreeColoursParams par)
{
HSVColour A = ColourToHSV(par.MinimumColour);
HSVColour B = ColourToHSV(par.MaximumColour);
HSVColour C = ColourToHSV(par.MediumColour);
//Ratio
double percent;
if (min == max)
{
percent = 1.0;
}
else
{
//Min can be different from 0
percent = (value - min) / (max - min);
}
if (percent == 0.5)
{
return(par.MediumColour);
}
else if (percent <= 0.5)
{
return(Color.FromArgb((int)Math.Round(par.MinimumColour.A + (par.MediumColour.A - par.MinimumColour.A) * percent), (int)Math.Round(par.MinimumColour.R + (par.MediumColour.R - par.MinimumColour.R) * percent), (int)Math.Round(par.MinimumColour.G + (par.MediumColour.G - par.MinimumColour.G) * percent), (int)Math.Round(par.MinimumColour.B + (par.MediumColour.B - par.MinimumColour.B) * percent)));
}
else
{
return(Color.FromArgb((int)Math.Round(par.MediumColour.A + (par.MaximumColour.A - par.MediumColour.A) * percent), (int)Math.Round(par.MediumColour.R + (par.MaximumColour.R - par.MediumColour.R) * percent), (int)Math.Round(par.MediumColour.G + (par.MaximumColour.G - par.MediumColour.G) * percent), (int)Math.Round(par.MediumColour.B + (par.MaximumColour.B - par.MediumColour.B) * percent)));
}
}
public void Test_HSVColour_Construct()
{
var hsv = new HSVColour();
hsv.H.Should().Be(0);
hsv.S.Should().Be(0);
hsv.V.Should().Be(0);
hsv.A.Should().Be(0); // Blegh!!
hsv = new HSVColour(11, 0.22, 0.33);
hsv.H.Should().Be((ColourPrimitive)11);
hsv.S.Should().Be((ColourPrimitive)0.22);
hsv.V.Should().Be((ColourPrimitive)0.33);
hsv.A.Should().Be(1);
hsv = new HSVColour(11, 0.22, 0.33, 0.44);
hsv.H.Should().Be((ColourPrimitive)11);
hsv.S.Should().Be((ColourPrimitive)0.22);
hsv.V.Should().Be((ColourPrimitive)0.33);
hsv.A.Should().Be((ColourPrimitive)0.44);
}
public static HSVColourAssertions Should(this HSVColour value) => new HSVColourAssertions(value);
