Normalize and Heatmap formulas.

utilities.java

class Utilities
{
   /**
    * Normalize the data point between 0 - 1. The data is weighted to prop up
    * smaller numbers to provide a more interesting spread.
    * @param The normalized data point value.
    * @return The weighted value.
    */
   public static Float normalize(float point, int max, int min)
   {
      Float value = (point - min) / (max - min);

      // Apply some weights to make it more interesting.
      if (value < .2)
         value *= 2;
      else if (value < .4)
         value *= (float)1.7;
      else if (value < .6)
         value *= (float)1.3;
      else if (value < .8)
         value *= (float)1.2;

      return value;
   }

   /**
    * Gets the color value for a normalized data point.
    * @param The current data point value.
    * @param The maximum value.
    * @param The minimum value.
    * @return The color to assign.
    */
   private Color getHeatMapColor(Float value)
   {

      float ratio = 2 * value;
      Float r = Math.max(0,  255 * (ratio -1));
      Float b = Math.max(0,  255 * (1-ratio));
      Float g = 255 - b - r;

      Color color = new Color(r.intValue(), g.intValue(), b.intValue());
      return color;
   }
}