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annotate dwt/graphics/Rectangle.d @ 30:93b13b15f0b1

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Ported a couple of modules in dwt.graphics
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Thu, 11 Sep 2008 23:16:53 +0200
parents a9ab4c738ed8
children 7d135fe0caf2
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.graphics.Rectangle;
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15
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16 import dwt.DWT;
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17 import dwt.internal.SerializableCompatibility;
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19 import tango.text.convert.Format;
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21 import dwt.dwthelper.utils;
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22
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23 /**
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24 * Instances of this class represent rectangular areas in an
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25 * (x, y) coordinate system. The top left corner of the rectangle
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26 * is specified by its x and y values, and the extent of the
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27 * rectangle is specified by its width and height.
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28 * <p>
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29 * The coordinate space for rectangles and points is considered
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30 * to have increasing values downward and to the right from its
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31 * origin making this the normal, computer graphics oriented notion
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32 * of (x, y) coordinates rather than the strict mathematical one.
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33 * </p>
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34 * <p>
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35 * The hashCode() method in this class uses the values of the public
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36 * fields to compute the hash value. When storing instances of the
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37 * class in hashed collections, do not modify these fields after the
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38 * object has been inserted.
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39 * </p>
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40 * <p>
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41 * Application code does <em>not</em> need to explicitly release the
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42 * resources managed by each instance when those instances are no longer
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43 * required, and thus no <code>dispose()</code> method is provided.
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44 * </p>
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45 *
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46 * @see Point
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47 */
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48
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49 public final class Rectangle : SerializableCompatibility {
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50
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51 /**
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52 * the x coordinate of the rectangle
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53 */
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54 public int x;
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55
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56 /**
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57 * the y coordinate of the rectangle
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58 */
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59 public int y;
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60
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61 /**
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62 * the width of the rectangle
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63 */
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64 public int width;
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65
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66 /**
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67 * the height of the rectangle
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68 */
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69 public int height;
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70
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71 static const long serialVersionUID = 3256439218279428914L;
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72
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73 /**
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74 * Construct a new instance of this class given the
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75 * x, y, width and height values.
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76 *
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77 * @param x the x coordinate of the origin of the rectangle
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78 * @param y the y coordinate of the origin of the rectangle
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79 * @param width the width of the rectangle
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80 * @param height the height of the rectangle
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81 */
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82 public this (int x, int y, int width, int height) {
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83 this.x = x;
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84 this.y = y;
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85 this.width = width;
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86 this.height = height;
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87 }
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88
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89 /**
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90 * Destructively replaces the x, y, width and height values
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91 * in the receiver with ones which represent the union of the
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92 * rectangles specified by the receiver and the given rectangle.
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93 * <p>
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94 * The union of two rectangles is the smallest single rectangle
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95 * that completely covers both of the areas covered by the two
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96 * given rectangles.
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97 * </p>
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98 *
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99 * @param rect the rectangle to merge with the receiver
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100 *
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101 * @exception IllegalArgumentException <ul>
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102 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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103 * </ul>
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104 */
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105 public void add (Rectangle rect) {
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106 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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107 int left = x < rect.x ? x : rect.x;
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108 int top = y < rect.y ? y : rect.y;
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109 int lhs = x + width;
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110 int rhs = rect.x + rect.width;
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111 int right = lhs > rhs ? lhs : rhs;
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112 lhs = y + height;
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113 rhs = rect.y + rect.height;
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114 int bottom = lhs > rhs ? lhs : rhs;
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115 x = left; y = top; width = right - left; height = bottom - top;
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116 }
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117
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118 /**
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119 * Returns <code>true</code> if the point specified by the
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120 * arguments is inside the area specified by the receiver,
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121 * and <code>false</code> otherwise.
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122 *
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123 * @param x the x coordinate of the point to test for containment
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124 * @param y the y coordinate of the point to test for containment
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125 * @return <code>true</code> if the rectangle contains the point and <code>false</code> otherwise
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126 */
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127 public bool contains (int x, int y) {
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128 return (x >= this.x) && (y >= this.y) && ((x - this.x) < width) && ((y - this.y) < height);
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129 }
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130
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131 /**
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132 * Returns <code>true</code> if the given point is inside the
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133 * area specified by the receiver, and <code>false</code>
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134 * otherwise.
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135 *
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136 * @param pt the point to test for containment
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137 * @return <code>true</code> if the rectangle contains the point and <code>false</code> otherwise
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138 *
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139 * @exception IllegalArgumentException <ul>
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140 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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141 * </ul>
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142 */
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143 public bool contains (Point pt) {
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144 if (pt is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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145 return contains(pt.x, pt.y);
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146 }
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147
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148 /**
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149 * Compares the argument to the receiver, and returns true
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150 * if they represent the <em>same</em> object using a class
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151 * specific comparison.
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152 *
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153 * @param object the object to compare with this object
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154 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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155 *
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156 * @see #hashCode()
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157 */
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158 public bool opEquals (Object object) {
0
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159 if (object is this) return true;
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160 if (!( null !is cast(Rectangle)object )) return false;
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161 Rectangle r = cast(Rectangle)object;
0
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162 return (r.x is this.x) && (r.y is this.y) && (r.width is this.width) && (r.height is this.height);
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163 }
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164
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165 alias opEquals equals;
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166
0
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167 /**
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168 * Returns an integer hash code for the receiver. Any two
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169 * objects that return <code>true</code> when passed to
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170 * <code>equals</code> must return the same value for this
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171 * method.
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172 *
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173 * @return the receiver's hash
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174 *
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175 * @see #equals(Object)
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176 */
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177 public hash_t toHash () {
0
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178 return x ^ y ^ width ^ height;
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179 }
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180
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181 alias toHash hashCode;
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182
0
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183 /**
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184 * Destructively replaces the x, y, width and height values
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185 * in the receiver with ones which represent the intersection of the
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186 * rectangles specified by the receiver and the given rectangle.
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187 *
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188 * @param rect the rectangle to intersect with the receiver
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189 *
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190 * @exception IllegalArgumentException <ul>
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191 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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192 * </ul>
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193 *
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194 * since 3.0
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195 */
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196 public void intersect (Rectangle rect) {
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197 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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198 if (this is rect) return;
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199 int left = x > rect.x ? x : rect.x;
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200 int top = y > rect.y ? y : rect.y;
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201 int lhs = x + width;
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202 int rhs = rect.x + rect.width;
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203 int right = lhs < rhs ? lhs : rhs;
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204 lhs = y + height;
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205 rhs = rect.y + rect.height;
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206 int bottom = lhs < rhs ? lhs : rhs;
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207 x = right < left ? 0 : left;
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208 y = bottom < top ? 0 : top;
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209 width = right < left ? 0 : right - left;
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210 height = bottom < top ? 0 : bottom - top;
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211 }
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212
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213 /**
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214 * Returns a new rectangle which represents the intersection
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215 * of the receiver and the given rectangle.
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216 * <p>
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217 * The intersection of two rectangles is the rectangle that
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218 * covers the area which is contained within both rectangles.
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219 * </p>
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220 *
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221 * @param rect the rectangle to intersect with the receiver
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222 * @return the intersection of the receiver and the argument
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223 *
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224 * @exception IllegalArgumentException <ul>
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225 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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226 * </ul>
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227 */
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228 public Rectangle intersection (Rectangle rect) {
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229 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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230 if (this is rect) return new Rectangle (x, y, width, height);
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231 int left = x > rect.x ? x : rect.x;
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232 int top = y > rect.y ? y : rect.y;
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233 int lhs = x + width;
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234 int rhs = rect.x + rect.width;
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235 int right = lhs < rhs ? lhs : rhs;
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236 lhs = y + height;
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237 rhs = rect.y + rect.height;
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238 int bottom = lhs < rhs ? lhs : rhs;
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239 return new Rectangle (
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240 right < left ? 0 : left,
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241 bottom < top ? 0 : top,
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242 right < left ? 0 : right - left,
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243 bottom < top ? 0 : bottom - top);
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244 }
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245
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246 /**
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247 * Returns <code>true</code> if the rectangle described by the
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248 * arguments intersects with the receiver and <code>false</code>
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249 * otherwise.
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250 * <p>
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251 * Two rectangles intersect if the area of the rectangle
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252 * representing their intersection is not empty.
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253 * </p>
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254 *
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255 * @param x the x coordinate of the origin of the rectangle
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256 * @param y the y coordinate of the origin of the rectangle
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257 * @param width the width of the rectangle
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258 * @param height the height of the rectangle
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259 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise
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260 *
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261 * @exception IllegalArgumentException <ul>
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262 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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263 * </ul>
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264 *
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265 * @see #intersection(Rectangle)
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266 * @see #isEmpty()
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267 *
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268 * @since 3.0
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269 */
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270 public bool intersects (int x, int y, int width, int height) {
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271 return (x < this.x + this.width) && (y < this.y + this.height) &&
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272 (x + width > this.x) && (y + height > this.y);
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273 }
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274
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275 /**
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276 * Returns <code>true</code> if the given rectangle intersects
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277 * with the receiver and <code>false</code> otherwise.
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278 * <p>
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279 * Two rectangles intersect if the area of the rectangle
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280 * representing their intersection is not empty.
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281 * </p>
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282 *
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283 * @param rect the rectangle to test for intersection
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284 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise
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285 *
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286 * @exception IllegalArgumentException <ul>
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287 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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288 * </ul>
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289 *
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290 * @see #intersection(Rectangle)
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291 * @see #isEmpty()
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292 */
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293 public bool intersects (Rectangle rect) {
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294 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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295 return rect is this || intersects (rect.x, rect.y, rect.width, rect.height);
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296 }
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297
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298 /**
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299 * Returns <code>true</code> if the receiver does not cover any
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300 * area in the (x, y) coordinate plane, and <code>false</code> if
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301 * the receiver does cover some area in the plane.
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302 * <p>
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303 * A rectangle is considered to <em>cover area</em> in the
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304 * (x, y) coordinate plane if both its width and height are
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305 * non-zero.
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306 * </p>
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307 *
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308 * @return <code>true</code> if the receiver is empty, and <code>false</code> otherwise
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309 */
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310 public bool isEmpty () {
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311 return (width <= 0) || (height <= 0);
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312 }
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313
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314 /**
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315 * Returns a string containing a concise, human-readable
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316 * description of the receiver.
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317 *
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318 * @return a string representation of the rectangle
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319 */
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320 public String toString () {
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321 return Format( "Rectangle {{{}, {}, {}, {}}", x, y, width, height ); //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
0
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322 }
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323
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324 /**
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325 * Returns a new rectangle which represents the union of
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326 * the receiver and the given rectangle.
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327 * <p>
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328 * The union of two rectangles is the smallest single rectangle
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329 * that completely covers both of the areas covered by the two
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330 * given rectangles.
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331 * </p>
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332 *
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333 * @param rect the rectangle to perform union with
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334 * @return the union of the receiver and the argument
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335 *
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336 * @exception IllegalArgumentException <ul>
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337 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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338 * </ul>
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339 *
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340 * @see #add(Rectangle)
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341 */
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342 public Rectangle unionn (Rectangle rect) {
0
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343 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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344 int left = x < rect.x ? x : rect.x;
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345 int top = y < rect.y ? y : rect.y;
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346 int lhs = x + width;
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347 int rhs = rect.x + rect.width;
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348 int right = lhs > rhs ? lhs : rhs;
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349 lhs = y + height;
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350 rhs = rect.y + rect.height;
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351 int bottom = lhs > rhs ? lhs : rhs;
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352 return new Rectangle (left, top, right - left, bottom - top);
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353 }
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354
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355 }