public static double Distance(Tone t1, Tone t2) { return Math.Sqrt( (t1.mR - t2.mR) * (t1.mR - t2.mR) + (t1.mG - t2.mG) * (t1.mG - t2.mG) + (t1.mB - t2.mB) * (t1.mB - t2.mB)); }