Mercurial > projects > dwt-mac
annotate dwt/graphics/Rectangle.d @ 8:a9ab4c738ed8
Fix: instanceof
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 27 Aug 2008 14:32:39 +0200 |
parents | e831403a80a9 |
children | 93b13b15f0b1 |
rev | line source |
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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 module dwt.graphics.Rectangle; |
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12 |
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13 import dwt.dwthelper.utils; |
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14 |
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15 import dwt.DWT; |
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16 import dwt.internal.SerializableCompatibility; |
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17 |
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18 /** |
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19 * Instances of this class represent rectangular areas in an |
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20 * (x, y) coordinate system. The top left corner of the rectangle |
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21 * is specified by its x and y values, and the extent of the |
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22 * rectangle is specified by its width and height. |
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23 * <p> |
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24 * The coordinate space for rectangles and points is considered |
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25 * to have increasing values downward and to the right from its |
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26 * origin making this the normal, computer graphics oriented notion |
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27 * of (x, y) coordinates rather than the strict mathematical one. |
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28 * </p> |
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29 * <p> |
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30 * The hashCode() method in this class uses the values of the public |
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31 * fields to compute the hash value. When storing instances of the |
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32 * class in hashed collections, do not modify these fields after the |
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33 * object has been inserted. |
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34 * </p> |
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35 * <p> |
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36 * Application code does <em>not</em> need to explicitly release the |
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37 * resources managed by each instance when those instances are no longer |
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38 * required, and thus no <code>dispose()</code> method is provided. |
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39 * </p> |
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40 * |
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41 * @see Point |
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42 */ |
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43 |
4 | 44 public final class Rectangle : SerializableCompatibility { |
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45 |
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46 /** |
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47 * the x coordinate of the rectangle |
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48 */ |
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49 public int x; |
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50 |
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51 /** |
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52 * the y coordinate of the rectangle |
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53 */ |
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54 public int y; |
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55 |
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56 /** |
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57 * the width of the rectangle |
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58 */ |
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59 public int width; |
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60 |
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61 /** |
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62 * the height of the rectangle |
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63 */ |
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64 public int height; |
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65 |
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66 static final long serialVersionUID = 3256439218279428914L; |
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67 |
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68 /** |
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69 * Construct a new instance of this class given the |
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70 * x, y, width and height values. |
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71 * |
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72 * @param x the x coordinate of the origin of the rectangle |
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73 * @param y the y coordinate of the origin of the rectangle |
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74 * @param width the width of the rectangle |
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75 * @param height the height of the rectangle |
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76 */ |
5 | 77 public this (int x, int y, int width, int height) { |
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78 this.x = x; |
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79 this.y = y; |
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80 this.width = width; |
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81 this.height = height; |
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82 } |
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83 |
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84 /** |
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85 * Destructively replaces the x, y, width and height values |
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86 * in the receiver with ones which represent the union of the |
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87 * rectangles specified by the receiver and the given rectangle. |
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88 * <p> |
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89 * The union of two rectangles is the smallest single rectangle |
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90 * that completely covers both of the areas covered by the two |
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91 * given rectangles. |
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92 * </p> |
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93 * |
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94 * @param rect the rectangle to merge with the receiver |
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95 * |
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96 * @exception IllegalArgumentException <ul> |
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97 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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98 * </ul> |
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99 */ |
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100 public void add (Rectangle rect) { |
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101 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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102 int left = x < rect.x ? x : rect.x; |
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103 int top = y < rect.y ? y : rect.y; |
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104 int lhs = x + width; |
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105 int rhs = rect.x + rect.width; |
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106 int right = lhs > rhs ? lhs : rhs; |
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107 lhs = y + height; |
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108 rhs = rect.y + rect.height; |
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109 int bottom = lhs > rhs ? lhs : rhs; |
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110 x = left; y = top; width = right - left; height = bottom - top; |
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111 } |
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112 |
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113 /** |
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114 * Returns <code>true</code> if the point specified by the |
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115 * arguments is inside the area specified by the receiver, |
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116 * and <code>false</code> otherwise. |
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117 * |
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118 * @param x the x coordinate of the point to test for containment |
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119 * @param y the y coordinate of the point to test for containment |
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120 * @return <code>true</code> if the rectangle contains the point and <code>false</code> otherwise |
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121 */ |
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122 public bool contains (int x, int y) { |
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123 return (x >= this.x) && (y >= this.y) && ((x - this.x) < width) && ((y - this.y) < height); |
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124 } |
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125 |
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126 /** |
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127 * Returns <code>true</code> if the given point is inside the |
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128 * area specified by the receiver, and <code>false</code> |
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129 * otherwise. |
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130 * |
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131 * @param pt the point to test for containment |
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132 * @return <code>true</code> if the rectangle contains the point and <code>false</code> otherwise |
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133 * |
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134 * @exception IllegalArgumentException <ul> |
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135 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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136 * </ul> |
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137 */ |
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138 public bool contains (Point pt) { |
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139 if (pt is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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140 return contains(pt.x, pt.y); |
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141 } |
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142 |
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143 /** |
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144 * Compares the argument to the receiver, and returns true |
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145 * if they represent the <em>same</em> object using a class |
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146 * specific comparison. |
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147 * |
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148 * @param object the object to compare with this object |
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149 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise |
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150 * |
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151 * @see #hashCode() |
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152 */ |
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153 public bool equals (Object object) { |
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154 if (object is this) return true; |
8 | 155 if (!( null !is cast(Rectangle)object )) return false; |
7 | 156 Rectangle r = cast(Rectangle)object; |
0
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157 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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158 } |
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159 |
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160 /** |
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161 * Returns an integer hash code for the receiver. Any two |
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162 * objects that return <code>true</code> when passed to |
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163 * <code>equals</code> must return the same value for this |
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164 * method. |
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165 * |
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166 * @return the receiver's hash |
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167 * |
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168 * @see #equals(Object) |
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169 */ |
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170 public int hashCode () { |
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171 return x ^ y ^ width ^ height; |
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172 } |
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173 |
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174 /** |
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175 * Destructively replaces the x, y, width and height values |
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176 * in the receiver with ones which represent the intersection of the |
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177 * rectangles specified by the receiver and the given rectangle. |
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178 * |
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179 * @param rect the rectangle to intersect with the receiver |
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180 * |
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181 * @exception IllegalArgumentException <ul> |
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182 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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183 * </ul> |
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184 * |
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185 * since 3.0 |
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186 */ |
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187 public void intersect (Rectangle rect) { |
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188 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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189 if (this is rect) return; |
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190 int left = x > rect.x ? x : rect.x; |
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191 int top = y > rect.y ? y : rect.y; |
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192 int lhs = x + width; |
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193 int rhs = rect.x + rect.width; |
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194 int right = lhs < rhs ? lhs : rhs; |
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195 lhs = y + height; |
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196 rhs = rect.y + rect.height; |
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197 int bottom = lhs < rhs ? lhs : rhs; |
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198 x = right < left ? 0 : left; |
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199 y = bottom < top ? 0 : top; |
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200 width = right < left ? 0 : right - left; |
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201 height = bottom < top ? 0 : bottom - top; |
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202 } |
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203 |
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204 /** |
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205 * Returns a new rectangle which represents the intersection |
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206 * of the receiver and the given rectangle. |
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207 * <p> |
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208 * The intersection of two rectangles is the rectangle that |
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209 * covers the area which is contained within both rectangles. |
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210 * </p> |
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211 * |
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212 * @param rect the rectangle to intersect with the receiver |
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213 * @return the intersection of the receiver and the argument |
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214 * |
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215 * @exception IllegalArgumentException <ul> |
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216 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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217 * </ul> |
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218 */ |
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219 public Rectangle intersection (Rectangle rect) { |
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220 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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221 if (this is rect) return new Rectangle (x, y, width, height); |
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222 int left = x > rect.x ? x : rect.x; |
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223 int top = y > rect.y ? y : rect.y; |
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224 int lhs = x + width; |
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225 int rhs = rect.x + rect.width; |
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226 int right = lhs < rhs ? lhs : rhs; |
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227 lhs = y + height; |
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228 rhs = rect.y + rect.height; |
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229 int bottom = lhs < rhs ? lhs : rhs; |
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230 return new Rectangle ( |
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231 right < left ? 0 : left, |
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232 bottom < top ? 0 : top, |
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233 right < left ? 0 : right - left, |
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234 bottom < top ? 0 : bottom - top); |
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235 } |
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236 |
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237 /** |
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238 * Returns <code>true</code> if the rectangle described by the |
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239 * arguments intersects with the receiver and <code>false</code> |
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240 * otherwise. |
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241 * <p> |
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242 * Two rectangles intersect if the area of the rectangle |
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243 * representing their intersection is not empty. |
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244 * </p> |
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245 * |
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246 * @param x the x coordinate of the origin of the rectangle |
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247 * @param y the y coordinate of the origin of the rectangle |
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248 * @param width the width of the rectangle |
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249 * @param height the height of the rectangle |
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250 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise |
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251 * |
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252 * @exception IllegalArgumentException <ul> |
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253 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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254 * </ul> |
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255 * |
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256 * @see #intersection(Rectangle) |
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257 * @see #isEmpty() |
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258 * |
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259 * @since 3.0 |
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260 */ |
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261 public bool intersects (int x, int y, int width, int height) { |
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262 return (x < this.x + this.width) && (y < this.y + this.height) && |
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263 (x + width > this.x) && (y + height > this.y); |
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264 } |
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265 |
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266 /** |
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267 * Returns <code>true</code> if the given rectangle intersects |
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268 * with the receiver and <code>false</code> otherwise. |
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269 * <p> |
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270 * Two rectangles intersect if the area of the rectangle |
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271 * representing their intersection is not empty. |
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272 * </p> |
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273 * |
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274 * @param rect the rectangle to test for intersection |
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275 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise |
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276 * |
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277 * @exception IllegalArgumentException <ul> |
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278 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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279 * </ul> |
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280 * |
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281 * @see #intersection(Rectangle) |
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282 * @see #isEmpty() |
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283 */ |
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284 public bool intersects (Rectangle rect) { |
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285 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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286 return rect is this || intersects (rect.x, rect.y, rect.width, rect.height); |
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287 } |
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288 |
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289 /** |
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290 * Returns <code>true</code> if the receiver does not cover any |
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291 * area in the (x, y) coordinate plane, and <code>false</code> if |
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292 * the receiver does cover some area in the plane. |
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293 * <p> |
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294 * A rectangle is considered to <em>cover area</em> in the |
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295 * (x, y) coordinate plane if both its width and height are |
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296 * non-zero. |
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297 * </p> |
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298 * |
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299 * @return <code>true</code> if the receiver is empty, and <code>false</code> otherwise |
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300 */ |
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301 public bool isEmpty () { |
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302 return (width <= 0) || (height <= 0); |
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303 } |
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304 |
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305 /** |
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306 * Returns a string containing a concise, human-readable |
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307 * description of the receiver. |
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308 * |
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309 * @return a string representation of the rectangle |
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310 */ |
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311 public String toString () { |
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312 return "Rectangle {" + x + ", " + y + ", " + width + ", " + height + "}"; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ |
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313 } |
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314 |
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315 /** |
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316 * Returns a new rectangle which represents the union of |
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317 * the receiver and the given rectangle. |
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318 * <p> |
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319 * The union of two rectangles is the smallest single rectangle |
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320 * that completely covers both of the areas covered by the two |
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321 * given rectangles. |
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322 * </p> |
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323 * |
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324 * @param rect the rectangle to perform union with |
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325 * @return the union of the receiver and the argument |
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326 * |
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327 * @exception IllegalArgumentException <ul> |
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328 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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329 * </ul> |
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330 * |
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331 * @see #add(Rectangle) |
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332 */ |
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333 public Rectangle union (Rectangle rect) { |
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334 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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335 int left = x < rect.x ? x : rect.x; |
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336 int top = y < rect.y ? y : rect.y; |
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337 int lhs = x + width; |
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338 int rhs = rect.x + rect.width; |
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339 int right = lhs > rhs ? lhs : rhs; |
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340 lhs = y + height; |
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341 rhs = rect.y + rect.height; |
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342 int bottom = lhs > rhs ? lhs : rhs; |
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343 return new Rectangle (left, top, right - left, bottom - top); |
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344 } |
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345 |
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346 } |