public static BandValueColorPair[] SamplesBandValueColors(BandValueColorPair[] allValueColors, int count, out float span)
{
span = -1;
if (allValueColors == null || allValueColors.Length == 0)
{
return(null);
}
if (count > allValueColors.Length)
{
count = allValueColors.Length;
}
BandValueColorPair[] rets = new BandValueColorPair[count];
if (count == 1)
{
rets[0] = allValueColors[0];
return(rets);
}
span = allValueColors.Length / (float)(count - 1);
for (int i = 0; i < count; i++)
{
int idx = (int)(i * span);
if (idx >= allValueColors.Length)
{
idx = allValueColors.Length - 1;
}
rets[i] = allValueColors[idx];
}
return(rets);
}
/// <summary>
/// 最大取255种
/// </summary>
/// <param name="bandValueColorPair"></param>
/// <returns></returns>
private ColorMapTable <double> ToColorMapTable(BandValueColorPair[] bandValueColorPair)
{
if (bandValueColorPair == null)
{
return(null);
}
ColorMapTable <double> ranges = new ColorMapTable <double>();
int maxCount = Math.Min(bandValueColorPair.Length, 254);
for (int i = 0; i < maxCount; i++)
//foreach (BandValueColorPair v in bandValueColorPair)
{
BandValueColorPair v = bandValueColorPair[i];
//[min,max)
ranges.Items.Add(new ColorMapItem <double>(v.MinValue, v.MinValue == v.MaxValue ? v.MaxValue : v.MaxValue + 1, Color.FromArgb(v.Color.R, v.Color.G, v.Color.B)));
}
return(ranges);
}
