android color between two colors, based on percentage?

Question

I would like to calculate the color depending on a percentage value:

float percentage = x/total;
int color;
if (percentage >= 0.95) {
  color = Color.GREE         


        

Answer 1

My $0.02, I found this answer and coded up the proper solution. (Thanks to Alnitak for the HSV tip!)

For Copy+Paste:

  private float interpolate(float a, float b, float proportion) {
    return (a + ((b - a) * proportion));
  }

  /** Returns an interpoloated color, between a and b */
  private int interpolateColor(int a, int b, float proportion) {
    float[] hsva = new float[3];
    float[] hsvb = new float[3];
    Color.colorToHSV(a, hsva);
    Color.colorToHSV(b, hsvb);
    for (int i = 0; i < 3; i++) {
      hsvb[i] = interpolate(hsva[i], hsvb[i], proportion);
    }
    return Color.HSVToColor(hsvb);
  }