根据温度获取颜色

最近需要做一个功能，就是根据温度显示物体的颜色，类似中国天气网：

 

 /// <summary>

    /// 根据温度获取颜色
    /// 算法如下：
    /// 1.定义色阶变化范围fromColor, toColor
    /// 2.获取因子：factor = T / (MaxT - MinT);
    /// 3.计算新的RGB
    ///   R = fromColor.R * (1 - factor) + toColor.R * factor
    ///   G = fromColor.G * (1 - factor) + toColor.G * factor
    ///   B = fromColor.B * (1 - factor) * toColor.B * factor
    /// 4.如果多个色阶，重复上面的运算
    /// </summary>
    public static class TemperatuerColor
    {
        private static Color Red = Color.FromRgb(255, 0, 0);
        private static Color Yellow = Color.FromRgb(255, 0, 0);
        private static Color Blue = Color.FromRgb(255, 0, 0);

        
        public static SolidColorBrush GetColor(double temperature, double maxtemperature, double mintemperature)
        {
            double ratio = temperature / (maxtemperature - mintemperature);
            Color result1 = Compute(Blue, Yellow, ratio);
            Color result2 = Compute(Yellow, Red, ratio);
            Color result =  Compute(result1, result2, ratio);

            return new SolidColorBrush(result);
        }

        private static Color Compute(Color fromColor, Color toColor, double ratio)
        {
            byte r = (byte)(fromColor.R * (1.0f - ratio) + toColor.R * ratio);
            byte g = (byte)(fromColor.G * (1.0f - ratio) + toColor.G * ratio);
            byte b = (byte)(fromColor.B * (1.0f - ratio) + toColor.B * ratio);
            return Color.FromRgb(r, g, b);
        }

    }

 我这里的颜色是红色->黄色->蓝色的渐变。如果需要增加新的色阶，就需要增加新的颜色.

Color result1 = Compute(Blue, Yellow, ratio);            

Color result2 = Compute(Yellow, Red, ratio);
Color result =  Compute(result1, result2, ratio);