[C#/WINFORM] 범위 색상 구하기

using System;
using System.Drawing;

#region 범위 색상 구하기 - GetRangeColor(minimum, maximum, value)

/// <summary>
/// 범위 색상 구하기
/// </summary>
/// <param name="minimum">최소값</param>
/// <param name="maximum">최대값</param>
/// <param name="value">값</param>
/// <returns>범위 색상</returns>
public Color GetRangeColor(double minimum, double maximum, double value)
{
    if(minimum == maximum)
    {
        return Color.Gray;
    }

    if(value <= minimum)
    {
        return Color.Blue;
    }

    if(value >= maximum)
    {
        return Color.Red;
    }

    double valuePercent = (value - minimum) / (maximum - minimum);

    if(valuePercent < 0.25d)
    {
        return Color.FromArgb
        (
            0,
            255 - Convert.ToInt32(254d * valuePercent / 0.25d),
            255
        );
    }
    else if(valuePercent < 0.5d)
    {
        return Color.FromArgb
        (
            0,
            255,
            Convert.ToInt32(254d * valuePercent - 0.25d / 0.25d)
        );
    }
    else if(valuePercent < 0.75d)
    {
        return Color.FromArgb
        (
            255 - Convert.ToInt32(254d * valuePercent - 0.5d / 0.25d),
            255,
            0
        );
    }
    else
    {
        return Color.FromArgb
        (
            255,
            Convert.ToInt32(254d * valuePercent - 0.75d / 0.25d),
            0
        );
    }
}

#endregion