code: private float colorToAngle(int color) {
  		float[] colors = new float[3];
  		Color.colorToHSV(color, colors);
  		
  		return (float) Math.toRadians(-colors[0]);
  	}
docs: Convert a color to an angle.
  
  @param color The RGB value of the color to "find" on the color wheel.
  
  @return The angle (in rad) the "normalized" color is displayed on the
  color wheel.