private static Dictionary <string, Color> GetGradientDictColor(BiColorGradientTheme gradientTheme)
{
var result = new Dictionary <string, Color>();
double minValue = gradientTheme.MinValue;
double maxValue = gradientTheme.MaxValue;
double interval = (maxValue - minValue) / 5;
double leftVal = 0;
double rightVal = 0;
if (interval == 0)
{
interval = 1;
}
for (int index = 0; index <= 4; index++)
{
leftVal = minValue + interval * index;
rightVal = minValue + interval * (index + 1);
string range = string.Format(" {0}~{1}", leftVal.ToString(), rightVal.ToString());
result.Add(range, gradientTheme.GetColorByValue(minValue + index * interval));
}
return(result);
}
public override Color GetColorByValue(double value)
{
double pos = (value - MinValue) / (MaxValue - MinValue);
double[] posArr = _stops.Keys.ToArray();
if (pos < posArr.First())
{
return(_stops.First().Value);
}
else
{
for (int i = 0; i < posArr.Length - 1; i++)
{
double a = posArr[i];
double b = posArr[i + 1];
if (pos >= a && pos < b)
{
var bcgm = new BiColorGradientTheme {
MinValue = a, MaxValue = b, MinColor = _stops[a], MaxColor = _stops[b]
};
return(bcgm.GetColorByValue(pos));
}
}
return(_stops.Last().Value);
}
}