Here you can find the source of roundDown(double value, int gridSize)
public static int roundDown(double value, int gridSize)
//package com.java2s; /**//from ww w . ja v a2s .co m * Copyright (C) 2009, 2010 * State of California, * Department of Water Resources. * This file is part of DSM2 Grid Map * The DSM2 Grid Map is free software: * you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * DSM2 Grid Map 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 General Public License for more details. [http://www.gnu.org/licenses] * * @author Nicky Sandhu * */ public class Main { public static int roundDown(double value, int gridSize) { return (int) (Math.floor(value / gridSize) * gridSize); } }