Mercurial > projects > dwt-mac
annotate dwt/graphics/Region.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | 649b8e223d5a |
rev | line source |
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0
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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.Region; |
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12 |
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13 import dwt.dwthelper.utils; |
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14 |
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15 |
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16 import dwt.DWT; |
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17 import dwt.DWTError; |
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18 import dwt.DWTException; |
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19 import dwt.internal.Callback; |
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20 import dwt.internal.cocoa.NSAffineTransform; |
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21 import dwt.internal.cocoa.NSBezierPath; |
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22 import dwt.internal.cocoa.NSPoint; |
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23 import dwt.internal.cocoa.NSRect; |
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24 import dwt.internal.cocoa.OS; |
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25 |
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26 /** |
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27 * Instances of this class represent areas of an x-y coordinate |
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28 * system that are aggregates of the areas covered by a number |
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29 * of polygons. |
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30 * <p> |
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31 * Application code must explicitly invoke the <code>Region.dispose()</code> |
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32 * method to release the operating system resources managed by each instance |
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33 * when those instances are no longer required. |
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34 * </p> |
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35 */ |
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36 public final class Region extends Resource { |
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37 /** |
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38 * the OS resource for the region |
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39 * (Warning: This field is platform dependent) |
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40 * <p> |
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41 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT |
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42 * public API. It is marked public only so that it can be shared |
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43 * within the packages provided by DWT. It is not available on all |
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44 * platforms and should never be accessed from application code. |
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45 * </p> |
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46 */ |
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47 public int handle; |
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48 |
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49 /** |
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50 * Constructs a new empty region. |
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51 * |
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52 * @exception DWTError <ul> |
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53 * <li>ERROR_NO_HANDLES if a handle could not be obtained for region creation</li> |
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54 * </ul> |
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55 */ |
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56 public Region() { |
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57 this(null); |
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58 } |
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59 |
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60 /** |
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61 * Constructs a new empty region. |
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62 * <p> |
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63 * You must dispose the region when it is no longer required. |
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64 * </p> |
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65 * |
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66 * @param device the device on which to allocate the region |
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67 * |
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68 * @exception IllegalArgumentException <ul> |
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69 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> |
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70 * </ul> |
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71 * @exception DWTError <ul> |
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72 * <li>ERROR_NO_HANDLES if a handle could not be obtained for region creation</li> |
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73 * </ul> |
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74 * |
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75 * @see #dispose |
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76 * |
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77 * @since 3.0 |
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78 */ |
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79 public Region(Device device) { |
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80 super(device); |
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81 handle = OS.NewRgn(); |
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82 if (handle is 0) DWT.error(DWT.ERROR_NO_HANDLES); |
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83 init(); |
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84 } |
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85 |
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86 Region(Device device, int handle) { |
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87 super(device); |
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88 this.handle = handle; |
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89 } |
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90 |
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91 /** |
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92 * Adds the given polygon to the collection of polygons |
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93 * the receiver maintains to describe its area. |
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94 * |
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95 * @param pointArray points that describe the polygon to merge with the receiver |
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96 * |
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97 * @exception IllegalArgumentException <ul> |
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98 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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99 * </ul> |
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100 * @exception DWTException <ul> |
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101 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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102 * </ul> |
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103 * |
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104 * @since 3.0 |
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105 * |
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106 */ |
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107 public void add (int[] pointArray) { |
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108 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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109 if (pointArray is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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110 add(pointArray, pointArray.length); |
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111 } |
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112 |
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113 void add(int[] pointArray, int count) { |
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114 if (count <= 2) return; |
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115 int polyRgn = OS.NewRgn(); |
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116 OS.OpenRgn(); |
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117 OS.MoveTo((short)pointArray[0], (short)pointArray[1]); |
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118 for (int i = 1; i < count / 2; i++) { |
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119 OS.LineTo((short)pointArray[2 * i], (short)pointArray[2 * i + 1]); |
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120 } |
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121 OS.LineTo((short)pointArray[0], (short)pointArray[1]); |
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122 OS.CloseRgn(polyRgn); |
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123 OS.UnionRgn(handle, polyRgn, handle); |
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124 OS.DisposeRgn(polyRgn); |
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125 } |
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126 |
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127 /** |
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128 * Adds the given rectangle to the collection of polygons |
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129 * the receiver maintains to describe its area. |
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130 * |
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131 * @param rect the rectangle to merge with the receiver |
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132 * |
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133 * @exception IllegalArgumentException <ul> |
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134 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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135 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
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136 * </ul> |
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137 * @exception DWTException <ul> |
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138 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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139 * </ul> |
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140 */ |
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141 public void add(Rectangle rect) { |
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142 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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143 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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144 if (rect.width < 0 || rect.height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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145 add (rect.x, rect.y, rect.width, rect.height); |
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146 } |
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147 |
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148 /** |
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149 * Adds the given rectangle to the collection of polygons |
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150 * the receiver maintains to describe its area. |
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151 * |
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152 * @param x the x coordinate of the rectangle |
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153 * @param y the y coordinate of the rectangle |
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154 * @param width the width coordinate of the rectangle |
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155 * @param height the height coordinate of the rectangle |
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156 * |
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157 * @exception IllegalArgumentException <ul> |
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158 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
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159 * </ul> |
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160 * @exception DWTException <ul> |
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161 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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162 * </ul> |
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163 * |
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164 * @since 3.1 |
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165 */ |
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166 public void add(int x, int y, int width, int height) { |
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167 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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168 if (width < 0 || height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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169 int rectRgn = OS.NewRgn(); |
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170 short[] r = new short[4]; |
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171 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height)); |
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172 OS.RectRgn(rectRgn, r); |
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173 OS.UnionRgn(handle, rectRgn, handle); |
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174 OS.DisposeRgn(rectRgn); |
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175 } |
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176 |
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177 /** |
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178 * Adds all of the polygons which make up the area covered |
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179 * by the argument to the collection of polygons the receiver |
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180 * maintains to describe its area. |
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181 * |
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182 * @param region the region to merge |
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183 * |
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184 * @exception IllegalArgumentException <ul> |
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185 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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186 * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> |
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187 * </ul> |
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188 * @exception DWTException <ul> |
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189 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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190 * </ul> |
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191 */ |
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192 public void add(Region region) { |
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193 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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194 if (region is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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195 if (region.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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196 OS.UnionRgn(handle, region.handle, handle); |
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197 } |
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198 |
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199 /** |
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200 * Returns <code>true</code> if the point specified by the |
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201 * arguments is inside the area specified by the receiver, |
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202 * and <code>false</code> otherwise. |
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203 * |
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204 * @param x the x coordinate of the point to test for containment |
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205 * @param y the y coordinate of the point to test for containment |
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206 * @return <code>true</code> if the region contains the point and <code>false</code> otherwise |
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207 * |
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208 * @exception DWTException <ul> |
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209 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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210 * </ul> |
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211 */ |
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212 public bool contains(int x, int y) { |
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213 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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214 short[] point = new short[]{(short)x, (short)y}; |
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215 return OS.PtInRgn(point, handle); |
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216 } |
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217 |
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218 /** |
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219 * Returns <code>true</code> if the given point is inside the |
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220 * area specified by the receiver, and <code>false</code> |
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221 * otherwise. |
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222 * |
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223 * @param pt the point to test for containment |
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224 * @return <code>true</code> if the region contains the point and <code>false</code> otherwise |
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225 * |
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226 * @exception IllegalArgumentException <ul> |
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227 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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228 * </ul> |
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229 * @exception DWTException <ul> |
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230 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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231 * </ul> |
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232 */ |
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233 public bool contains(Point pt) { |
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234 if (pt is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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235 return contains(pt.x, pt.y); |
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236 } |
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237 |
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238 NSAffineTransform transform; |
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239 void convertRgn(NSAffineTransform transform) { |
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240 int newRgn = OS.NewRgn(); |
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241 Callback callback = new Callback(this, "convertRgn", 4); |
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242 int proc = callback.getAddress(); |
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243 if (proc is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS); |
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244 this.transform = transform; |
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245 OS.QDRegionToRects(handle, OS.kQDParseRegionFromTopLeft, proc, newRgn); |
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246 this.transform = null; |
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247 callback.dispose(); |
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248 OS.CopyRgn(newRgn, handle); |
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249 OS.DisposeRgn(newRgn); |
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250 } |
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251 |
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252 int convertRgn(int message, int rgn, int r, int newRgn) { |
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253 if (message is OS.kQDRegionToRectsMsgParse) { |
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254 short[] rect = new short[4]; |
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255 OS.memmove(rect, r, rect.length * 2); |
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256 NSPoint point = new NSPoint(); |
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257 int polyRgn = OS.NewRgn(); |
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258 OS.OpenRgn(); |
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259 point.x = rect[1]; |
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260 point.y = rect[0]; |
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261 point = transform.transformPoint(point); |
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262 short startX, startY; |
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263 OS.MoveTo(startX = (short)point.x, startY = (short)point.y); |
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264 point.x = rect[3]; |
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265 point.y = rect[0]; |
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266 point = transform.transformPoint(point); |
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267 OS.LineTo((short)Math.round(point.x), (short)point.y); |
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268 point.x = rect[3]; |
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269 point.y = rect[2]; |
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270 point = transform.transformPoint(point); |
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271 OS.LineTo((short)Math.round(point.x), (short)Math.round(point.y)); |
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272 point.x = rect[1]; |
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273 point.y = rect[2]; |
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274 point = transform.transformPoint(point); |
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275 OS.LineTo((short)point.x, (short)Math.round(point.y)); |
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276 OS.LineTo(startX, startY); |
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277 OS.CloseRgn(polyRgn); |
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278 OS.UnionRgn(newRgn, polyRgn, newRgn); |
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279 OS.DisposeRgn(polyRgn); |
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280 } |
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281 return 0; |
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282 } |
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283 |
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284 void destroy() { |
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285 OS.DisposeRgn(handle); |
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286 handle = 0; |
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287 } |
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288 |
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289 /** |
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290 * Compares the argument to the receiver, and returns true |
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291 * if they represent the <em>same</em> object using a class |
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292 * specific comparison. |
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293 * |
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294 * @param object the object to compare with this object |
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295 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise |
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296 * |
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297 * @see #hashCode |
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298 */ |
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299 public bool equals(Object object) { |
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300 if (this is object) return true; |
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301 if (!(object instanceof Region)) return false; |
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302 Region region = (Region)object; |
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303 return handle is region.handle; |
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304 } |
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305 |
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306 /** |
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307 * Returns a rectangle which represents the rectangular |
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308 * union of the collection of polygons the receiver |
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309 * maintains to describe its area. |
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310 * |
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311 * @return a bounding rectangle for the region |
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312 * |
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313 * @exception DWTException <ul> |
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314 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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315 * </ul> |
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316 * |
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317 * @see Rectangle#union |
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318 */ |
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319 public Rectangle getBounds() { |
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320 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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321 short[] bounds = new short[4]; |
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322 OS.GetRegionBounds(handle, bounds); |
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323 int width = bounds[3] - bounds[1]; |
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324 int height = bounds[2] - bounds[0]; |
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325 return new Rectangle(bounds[1], bounds[0], width, height); |
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326 } |
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327 |
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328 NSBezierPath getPath() { |
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329 Callback callback = new Callback(this, "regionToRects", 4); |
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330 if (callback.getAddress() is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS); |
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331 NSBezierPath path = NSBezierPath.bezierPath(); |
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332 path.retain(); |
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333 OS.QDRegionToRects(handle, OS.kQDParseRegionFromTopLeft, callback.getAddress(), path.id); |
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334 callback.dispose(); |
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335 if (path.isEmpty()) path.appendBezierPathWithRect(new NSRect()); |
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336 return path; |
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337 } |
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338 |
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339 NSPoint pt = new NSPoint(); |
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340 short[] rect = new short[4]; |
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341 int regionToRects(int message, int rgn, int r, int path) { |
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342 if (message is OS.kQDRegionToRectsMsgParse) { |
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343 OS.memmove(rect, r, rect.length * 2); |
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344 pt.x = rect[1]; |
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345 pt.y = rect[0]; |
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346 OS.objc_msgSend(path, OS.sel_moveToPoint_1, pt); |
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347 pt.x = rect[3]; |
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348 OS.objc_msgSend(path, OS.sel_lineToPoint_1, pt); |
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349 pt.x = rect[3]; |
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350 pt.y = rect[2]; |
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351 OS.objc_msgSend(path, OS.sel_lineToPoint_1, pt); |
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352 pt.x = rect[1]; |
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353 OS.objc_msgSend(path, OS.sel_lineToPoint_1, pt); |
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354 OS.objc_msgSend(path, OS.sel_closePath); |
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355 } |
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356 return 0; |
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357 } |
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358 |
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359 public static Region carbon_new(Device device, int handle) { |
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360 return new Region(device, handle); |
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361 } |
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362 |
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363 /** |
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364 * Returns an integer hash code for the receiver. Any two |
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365 * objects that return <code>true</code> when passed to |
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366 * <code>equals</code> must return the same value for this |
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367 * method. |
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368 * |
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369 * @return the receiver's hash |
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370 * |
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371 * @see #equals |
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372 */ |
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373 public int hashCode() { |
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374 return handle; |
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375 } |
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376 |
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377 /** |
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378 * Intersects the given rectangle to the collection of polygons |
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379 * the receiver maintains to describe its area. |
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380 * |
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381 * @param rect the rectangle to intersect with the receiver |
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382 * |
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383 * @exception IllegalArgumentException <ul> |
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384 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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385 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
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386 * </ul> |
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387 * @exception DWTException <ul> |
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388 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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389 * </ul> |
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390 * |
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391 * @since 3.0 |
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392 */ |
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393 public void intersect(Rectangle rect) { |
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394 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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395 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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396 intersect (rect.x, rect.y, rect.width, rect.height); |
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397 } |
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398 |
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399 /** |
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400 * Intersects the given rectangle to the collection of polygons |
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401 * the receiver maintains to describe its area. |
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402 * |
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403 * @param x the x coordinate of the rectangle |
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404 * @param y the y coordinate of the rectangle |
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405 * @param width the width coordinate of the rectangle |
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406 * @param height the height coordinate of the rectangle |
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407 * |
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408 * @exception IllegalArgumentException <ul> |
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409 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
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410 * </ul> |
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411 * @exception DWTException <ul> |
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412 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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413 * </ul> |
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414 * |
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415 * @since 3.1 |
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416 */ |
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417 public void intersect(int x, int y, int width, int height) { |
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418 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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419 if (width < 0 || height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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420 int rectRgn = OS.NewRgn(); |
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421 short[] r = new short[4]; |
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422 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height)); |
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423 OS.RectRgn(rectRgn, r); |
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424 OS.SectRgn(handle, rectRgn, handle); |
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425 OS.DisposeRgn(rectRgn); |
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426 } |
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427 |
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428 /** |
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429 * Intersects all of the polygons which make up the area covered |
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430 * by the argument to the collection of polygons the receiver |
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431 * maintains to describe its area. |
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432 * |
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433 * @param region the region to intersect |
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434 * |
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435 * @exception IllegalArgumentException <ul> |
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436 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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437 * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> |
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438 * </ul> |
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439 * @exception DWTException <ul> |
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440 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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441 * </ul> |
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442 * |
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443 * @since 3.0 |
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444 */ |
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445 public void intersect(Region region) { |
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446 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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447 if (region is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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448 if (region.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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449 OS.SectRgn(handle, region.handle, handle); |
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450 } |
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451 |
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452 /** |
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453 * Returns <code>true</code> if the rectangle described by the |
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454 * arguments intersects with any of the polygons the receiver |
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455 * maintains to describe its area, and <code>false</code> otherwise. |
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456 * |
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457 * @param x the x coordinate of the origin of the rectangle |
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458 * @param y the y coordinate of the origin of the rectangle |
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459 * @param width the width of the rectangle |
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460 * @param height the height of the rectangle |
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461 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise |
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462 * |
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463 * @exception DWTException <ul> |
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464 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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465 * </ul> |
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466 * |
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467 * @see Rectangle#intersects(Rectangle) |
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468 */ |
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469 public bool intersects (int x, int y, int width, int height) { |
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470 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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471 short[] r = new short[4]; |
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472 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height)); |
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473 return OS.RectInRgn(rect, handle); |
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474 } |
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475 |
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476 /** |
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477 * Returns <code>true</code> if the given rectangle intersects |
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478 * with any of the polygons the receiver maintains to describe |
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479 * its area and <code>false</code> otherwise. |
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480 * |
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481 * @param rect the rectangle to test for intersection |
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482 * @return <code>true</code> if the rectangle intersects with the receiver, and <code>false</code> otherwise |
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483 * |
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484 * @exception IllegalArgumentException <ul> |
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485 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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486 * </ul> |
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487 * @exception DWTException <ul> |
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488 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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489 * </ul> |
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490 * |
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491 * @see Rectangle#intersects(Rectangle) |
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492 */ |
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493 public bool intersects(Rectangle rect) { |
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494 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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495 return intersects(rect.x, rect.y, rect.width, rect.height); |
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496 } |
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497 |
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498 /** |
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499 * Returns <code>true</code> if the region has been disposed, |
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500 * and <code>false</code> otherwise. |
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501 * <p> |
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502 * This method gets the dispose state for the region. |
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503 * When a region has been disposed, it is an error to |
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504 * invoke any other method using the region. |
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505 * |
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506 * @return <code>true</code> when the region is disposed, and <code>false</code> otherwise |
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507 */ |
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508 public bool isDisposed() { |
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509 return handle is 0; |
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510 } |
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511 |
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512 /** |
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513 * Returns <code>true</code> if the receiver does not cover any |
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514 * area in the (x, y) coordinate plane, and <code>false</code> if |
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515 * the receiver does cover some area in the plane. |
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516 * |
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517 * @return <code>true</code> if the receiver is empty, and <code>false</code> otherwise |
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518 * |
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519 * @exception DWTException <ul> |
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520 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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521 * </ul> |
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522 */ |
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523 public bool isEmpty() { |
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524 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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525 return OS.EmptyRgn(handle); |
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526 } |
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527 |
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528 /** |
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529 * Subtracts the given polygon from the collection of polygons |
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530 * the receiver maintains to describe its area. |
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531 * |
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532 * @param pointArray points that describe the polygon to merge with the receiver |
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533 * |
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534 * @exception IllegalArgumentException <ul> |
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535 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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536 * </ul> |
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537 * @exception DWTException <ul> |
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538 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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539 * </ul> |
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540 * |
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541 * @since 3.0 |
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542 */ |
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543 public void subtract (int[] pointArray) { |
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544 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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545 if (pointArray is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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546 if (pointArray.length < 2) return; |
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547 int polyRgn = OS.NewRgn(); |
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548 OS.OpenRgn(); |
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549 OS.MoveTo((short)pointArray[0], (short)pointArray[1]); |
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550 for (int i = 1; i < pointArray.length / 2; i++) { |
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551 OS.LineTo((short)pointArray[2 * i], (short)pointArray[2 * i + 1]); |
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552 } |
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553 OS.LineTo((short)pointArray[0], (short)pointArray[1]); |
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554 OS.CloseRgn(polyRgn); |
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555 OS.DiffRgn(handle, polyRgn, handle); |
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556 OS.DisposeRgn(polyRgn); |
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557 } |
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558 |
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559 /** |
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560 * Subtracts the given rectangle from the collection of polygons |
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561 * the receiver maintains to describe its area. |
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562 * |
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563 * @param rect the rectangle to subtract from the receiver |
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564 * |
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565 * @exception IllegalArgumentException <ul> |
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566 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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567 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
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568 * </ul> |
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569 * @exception DWTException <ul> |
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570 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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571 * </ul> |
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572 * |
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573 * @since 3.0 |
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574 */ |
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575 public void subtract(Rectangle rect) { |
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576 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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577 if (rect is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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578 subtract (rect.x, rect.y, rect.width, rect.height); |
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579 } |
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580 |
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581 /** |
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582 * Subtracts the given rectangle from the collection of polygons |
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583 * the receiver maintains to describe its area. |
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584 * |
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585 * @param x the x coordinate of the rectangle |
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586 * @param y the y coordinate of the rectangle |
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587 * @param width the width coordinate of the rectangle |
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588 * @param height the height coordinate of the rectangle |
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589 * |
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590 * @exception IllegalArgumentException <ul> |
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591 * <li>ERROR_INVALID_ARGUMENT - if the rectangle's width or height is negative</li> |
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592 * </ul> |
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593 * @exception DWTException <ul> |
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594 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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595 * </ul> |
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596 * |
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597 * @since 3.1 |
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598 */ |
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599 public void subtract(int x, int y, int width, int height) { |
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600 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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601 if (width < 0 || height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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602 int rectRgn = OS.NewRgn(); |
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603 short[] r = new short[4]; |
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604 OS.SetRect(r, (short)x, (short)y, (short)(x + width),(short)(y + height)); |
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605 OS.RectRgn(rectRgn, r); |
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606 OS.DiffRgn(handle, rectRgn, handle); |
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607 OS.DisposeRgn(rectRgn); |
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608 } |
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|
609 |
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610 /** |
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611 * Subtracts all of the polygons which make up the area covered |
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612 * by the argument from the collection of polygons the receiver |
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613 * maintains to describe its area. |
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614 * |
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615 * @param region the region to subtract |
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616 * |
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617 * @exception IllegalArgumentException <ul> |
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618 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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619 * <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> |
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620 * </ul> |
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621 * @exception DWTException <ul> |
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622 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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623 * </ul> |
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624 * |
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625 * @since 3.0 |
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626 */ |
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627 public void subtract(Region region) { |
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628 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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629 if (region is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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630 if (region.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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631 OS.DiffRgn(handle, region.handle, handle); |
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632 } |
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|
633 |
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634 /** |
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635 * Translate all of the polygons the receiver maintains to describe |
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636 * its area by the specified point. |
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637 * |
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638 * @param x the x coordinate of the point to translate |
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639 * @param y the y coordinate of the point to translate |
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640 * |
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641 * @exception DWTException <ul> |
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642 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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643 * </ul> |
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644 * |
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645 * @since 3.1 |
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646 */ |
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647 public void translate (int x, int y) { |
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648 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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649 OS.OffsetRgn (handle, (short)x, (short)y); |
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650 } |
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651 |
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|
652 /** |
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653 * Translate all of the polygons the receiver maintains to describe |
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654 * its area by the specified point. |
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655 * |
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656 * @param pt the point to translate |
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657 * |
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658 * @exception IllegalArgumentException <ul> |
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659 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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660 * </ul> |
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661 * @exception DWTException <ul> |
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662 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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663 * </ul> |
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664 * |
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665 * @since 3.1 |
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666 */ |
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667 public void translate (Point pt) { |
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668 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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669 if (pt is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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670 translate (pt.x, pt.y); |
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671 } |
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|
672 |
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|
673 /** |
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674 * Returns a string containing a concise, human-readable |
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675 * description of the receiver. |
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|
676 * |
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677 * @return a string representation of the receiver |
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|
678 */ |
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|
679 public String toString () { |
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680 if (isDisposed()) return "Region {*DISPOSED*}"; |
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681 return "Region {" + handle + "}"; |
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682 } |
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683 } |