Here you can find the source of roundToInterval(float num, float interval)
public static float roundToInterval(float num, float interval)
//package com.java2s; /*/*from w w w . ja v a 2 s . co m*/ java package de.elxala.math Copyright (C) 2012 Alejandro Xalabarder Aulet This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ public class Main { public static float roundToInterval(float num, float interval) { if (interval == 0f) return num; return (float) ((double) Math.round(num / interval) * interval); } public static float round(float num, int ndec) { double fact = Math.pow(10, ndec); return (float) ((double) Math.round(num * fact) / fact); } }