private static Colour ConvertToColor(IEnumerable <ColourPointValueMapping> points, int?x)
{
var hue = new Colour();
if (x.HasValue)
{
var enumerated = points.ToList();
x = FixValue(enumerated, x);
ColourPointValueMapping smaller = GetSmallerValue(enumerated, x);
if (smaller.Value == x)
{
return(smaller.Colour);
}
ColourPointValueMapping larger = GetLargerValue(enumerated, x);
if (larger.Value == x)
{
return(larger.Colour);
}
hue.A = (byte)((larger.Colour.A - smaller.Colour.A) * (x.Value - smaller.Value) / (larger.Value - smaller.Value) + smaller.Colour.A);
hue.R = (byte)((larger.Colour.R - smaller.Colour.R) * (x.Value - smaller.Value) / (larger.Value - smaller.Value) + smaller.Colour.R);
hue.G = (byte)((larger.Colour.G - smaller.Colour.G) * (x.Value - smaller.Value) / (larger.Value - smaller.Value) + smaller.Colour.G);
hue.B = (byte)((larger.Colour.B - smaller.Colour.B) * (x.Value - smaller.Value) / (larger.Value - smaller.Value) + smaller.Colour.B);
}
return(hue);
}
private static int?ConvertToValue(IEnumerable <ColourPointValueMapping> points, double?x)
{
if (x.HasValue)
{
var enumerated = points.ToList();
x = FixPoint(enumerated, x);
ColourPointValueMapping smaller = GetSmallerPoint(enumerated, x);
if (smaller.Point == x)
{
return(smaller.Value);
}
ColourPointValueMapping larger = GetLargerPoint(enumerated, x);
if (smaller.Point == x)
{
return(larger.Value);
}
return((int)((larger.Value - smaller.Value) * (x.Value - smaller.Point) / (larger.Point - smaller.Point)) + smaller.Value);
}
return(null);
}