1 /* 2 * Copyright (c) 2009-2010 jMonkeyEngine 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * * Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * 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 LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 package com.jme3.math; 34 35 import com.jme3.export.*; 36 import java.io.IOException; 37 38 39 /** 40 * 41 * <code>Rectangle</code> defines a finite plane within three dimensional space 42 * that is specified via three points (A, B, C). These three points define a 43 * triangle with the forth point defining the rectangle ((B + C) - A. 44 * 45 * @author Mark Powell 46 * @author Joshua Slack 47 */ 48 49 public final class Rectangle implements Savable, Cloneable, java.io.Serializable { 50 51 static final long serialVersionUID = 1; 52 53 private Vector3f a, b, c; 54 55 /** 56 * Constructor creates a new <code>Rectangle</code> with no defined corners. 57 * A, B, and C must be set to define a valid rectangle. 58 * 59 */ 60 public Rectangle() { 61 a = new Vector3f(); 62 b = new Vector3f(); 63 c = new Vector3f(); 64 } 65 66 /** 67 * Constructor creates a new <code>Rectangle</code> with defined A, B, and C 68 * points that define the area of the rectangle. 69 * 70 * @param a 71 * the first corner of the rectangle. 72 * @param b 73 * the second corner of the rectangle. 74 * @param c 75 * the third corner of the rectangle. 76 */ 77 public Rectangle(Vector3f a, Vector3f b, Vector3f c) { 78 this.a = a; 79 this.b = b; 80 this.c = c; 81 } 82 83 /** 84 * <code>getA</code> returns the first point of the rectangle. 85 * 86 * @return the first point of the rectangle. 87 */ 88 public Vector3f getA() { 89 return a; 90 } 91 92 /** 93 * <code>setA</code> sets the first point of the rectangle. 94 * 95 * @param a 96 * the first point of the rectangle. 97 */ 98 public void setA(Vector3f a) { 99 this.a = a; 100 } 101 102 /** 103 * <code>getB</code> returns the second point of the rectangle. 104 * 105 * @return the second point of the rectangle. 106 */ 107 public Vector3f getB() { 108 return b; 109 } 110 111 /** 112 * <code>setB</code> sets the second point of the rectangle. 113 * 114 * @param b 115 * the second point of the rectangle. 116 */ 117 public void setB(Vector3f b) { 118 this.b = b; 119 } 120 121 /** 122 * <code>getC</code> returns the third point of the rectangle. 123 * 124 * @return the third point of the rectangle. 125 */ 126 public Vector3f getC() { 127 return c; 128 } 129 130 /** 131 * <code>setC</code> sets the third point of the rectangle. 132 * 133 * @param c 134 * the third point of the rectangle. 135 */ 136 public void setC(Vector3f c) { 137 this.c = c; 138 } 139 140 /** 141 * <code>random</code> returns a random point within the plane defined by: 142 * A, B, C, and (B + C) - A. 143 * 144 * @return a random point within the rectangle. 145 */ 146 public Vector3f random() { 147 return random(null); 148 } 149 150 /** 151 * <code>random</code> returns a random point within the plane defined by: 152 * A, B, C, and (B + C) - A. 153 * 154 * @param result 155 * Vector to store result in 156 * @return a random point within the rectangle. 157 */ 158 public Vector3f random(Vector3f result) { 159 if (result == null) { 160 result = new Vector3f(); 161 } 162 163 float s = FastMath.nextRandomFloat(); 164 float t = FastMath.nextRandomFloat(); 165 166 float aMod = 1.0f - s - t; 167 result.set(a.mult(aMod).addLocal(b.mult(s).addLocal(c.mult(t)))); 168 return result; 169 } 170 171 public void write(JmeExporter e) throws IOException { 172 OutputCapsule capsule = e.getCapsule(this); 173 capsule.write(a, "a", Vector3f.ZERO); 174 capsule.write(b, "b", Vector3f.ZERO); 175 capsule.write(c, "c", Vector3f.ZERO); 176 } 177 178 public void read(JmeImporter e) throws IOException { 179 InputCapsule capsule = e.getCapsule(this); 180 a = (Vector3f) capsule.readSavable("a", Vector3f.ZERO.clone()); 181 b = (Vector3f) capsule.readSavable("b", Vector3f.ZERO.clone()); 182 c = (Vector3f) capsule.readSavable("c", Vector3f.ZERO.clone()); 183 } 184 185 @Override 186 public Rectangle clone() { 187 try { 188 Rectangle r = (Rectangle) super.clone(); 189 r.a = a.clone(); 190 r.b = b.clone(); 191 r.c = c.clone(); 192 return r; 193 } catch (CloneNotSupportedException e) { 194 throw new AssertionError(); 195 } 196 } 197 } 198
