1 /* 2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. 3 * All rights reserved. Use is subject to license terms. 4 * 5 * This file is available and licensed under the following license: 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * - Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the distribution. 16 * - Neither the name of Oracle Corporation nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 package com.oracle.javafx.scenebuilder.kit.util; 33 34 /** 35 * 36 */ 37 public class MathUtils { 38 39 /** 40 * Returns true if the two specified double values are approximately equals. 41 * @param v1 first double to check 42 * @param v2 second double to check 43 * @return true if the two specified double values are approximately equals. 44 */ 45 public static boolean equals(double v1, double v2) { 46 return Math.abs(v1 - v2) < 0.0000001; 47 } 48 49 /** 50 * Returns true if the two specified double values are equal with 51 * the specified tolerance. 52 * 53 * @param v1 first double to check 54 * @param v2 second double to check 55 * @param tolerance a strictly positive value 56 * @return true if the two specified double values are approximately equals. 57 */ 58 public static boolean equals(double v1, double v2, double tolerance) { 59 assert tolerance > 0.0; 60 return Math.abs(v1 - v2) <= tolerance; 61 } 62 63 64 /** 65 * Return the distance between two points. 66 * @param x1 x coordinate of the first point 67 * @param y1 y coordinate of the first point 68 * @param x2 x coordinate of the second point 69 * @param y2 x coordinate of the second point 70 * @return the distance between (x1, y1) and (x2, y2) 71 */ 72 public static double distance(double x1, double y1, double x2, double y2) { 73 final double dx = x2 - x1; 74 final double dy = y2 - y1; 75 return Math.sqrt(dx * dx + dy * dy); 76 } 77 }