Mercurial > projects > dwt-mac
annotate dwt/graphics/Color.d @ 29:d408fc12b991
Ported dwt.graphics.Color and RGB
author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Wed, 10 Sep 2008 23:18:26 +0200 |
parents | a9ab4c738ed8 |
children | 5123b17c98ef |
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 |
29
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10 * |
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11 * Port to the D programming language: |
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12 * Jacob Carlborg <jacob.carlborg@gmail.com> |
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13 *******************************************************************************/ |
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14 module dwt.graphics.Color; |
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15 |
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16 |
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17 import dwt.DWT; |
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18 import dwt.DWTException; |
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19 |
29
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20 import dwt.dwthelper.utils; |
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21 import dwt.graphics.Device; |
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22 import dwt.graphics.Resource; |
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23 import dwt.graphics.RGB; |
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24 |
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25 /** |
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26 * Instances of this class manage the operating system resources that |
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27 * implement DWT's RGB color model. To create a color you can either |
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28 * specify the individual color components as integers in the range |
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29 * 0 to 255 or provide an instance of an <code>RGB</code>. |
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30 * <p> |
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31 * Application code must explicitly invoke the <code>Color.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 * @see RGB |
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37 * @see Device#getSystemColor |
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38 */ |
3 | 39 public final class Color : Resource { |
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40 /** |
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41 * the handle to the OS color resource |
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42 * (Warning: This field is platform dependent) |
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43 * <p> |
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44 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT |
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45 * public API. It is marked public only so that it can be shared |
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46 * within the packages provided by DWT. It is not available on all |
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47 * platforms and should never be accessed from application code. |
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48 * </p> |
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49 */ |
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50 public float[] handle; |
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51 |
5 | 52 this(Device device) { |
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53 super(device); |
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54 } |
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55 |
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56 /** |
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57 * Constructs a new instance of this class given a device and the |
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58 * desired red, green and blue values expressed as ints in the range |
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59 * 0 to 255 (where 0 is black and 255 is full brightness). On limited |
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60 * color devices, the color instance created by this call may not have |
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61 * the same RGB values as the ones specified by the arguments. The |
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62 * RGB values on the returned instance will be the color values of |
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63 * the operating system color. |
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64 * <p> |
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65 * You must dispose the color when it is no longer required. |
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66 * </p> |
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67 * |
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68 * @param device the device on which to allocate the color |
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69 * @param red the amount of red in the color |
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70 * @param green the amount of green in the color |
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71 * @param blue the amount of blue in the color |
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72 * |
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73 * @exception IllegalArgumentException <ul> |
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74 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> |
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75 * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li> |
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76 * </ul> |
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77 * |
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78 * @see #dispose |
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79 */ |
5 | 80 public this(Device device, int red, int green, int blue) { |
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81 super(device); |
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82 init(red, green, blue); |
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83 init(); |
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84 } |
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85 |
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86 /** |
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87 * Constructs a new instance of this class given a device and an |
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88 * <code>RGB</code> describing the desired red, green and blue values. |
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89 * On limited color devices, the color instance created by this call |
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90 * may not have the same RGB values as the ones specified by the |
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91 * argument. The RGB values on the returned instance will be the color |
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92 * values of the operating system color. |
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93 * <p> |
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94 * You must dispose the color when it is no longer required. |
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95 * </p> |
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96 * |
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97 * @param device the device on which to allocate the color |
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98 * @param rgb the RGB values of the desired color |
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99 * |
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100 * @exception IllegalArgumentException <ul> |
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101 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> |
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102 * <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li> |
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103 * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not between 0 and 255</li> |
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104 * </ul> |
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105 * |
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106 * @see #dispose |
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107 */ |
5 | 108 public this(Device device, RGB rgb) { |
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109 super(device); |
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110 if (rgb is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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111 init(rgb.red, rgb.green, rgb.blue); |
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112 init(); |
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113 } |
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114 |
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115 void destroy() { |
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116 handle = null; |
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117 } |
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118 |
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119 /** |
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120 * Compares the argument to the receiver, and returns true |
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121 * if they represent the <em>same</em> object using a class |
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122 * specific comparison. |
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123 * |
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124 * @param object the object to compare with this object |
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125 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise |
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126 * |
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127 * @see #hashCode |
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128 */ |
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129 public bool equals(Object object) { |
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130 if (object is this) return true; |
8 | 131 if (!( null !is cast(Color)object )) return false; |
7 | 132 Color color = cast(Color)object; |
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133 float[] rgbColor = color.handle; |
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134 if (handle is rgbColor) return true; |
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135 return device is color.device && |
7 | 136 cast(int)(handle[0] * 255) is cast(int)(rgbColor[0] * 255) && |
137 cast(int)(handle[1] * 255) is cast(int)(rgbColor[1] * 255) && | |
138 cast(int)(handle[2] * 255) is cast(int)(rgbColor[2] * 255); | |
0
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139 } |
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140 |
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141 alias equals opEquals; |
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142 |
0
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143 /** |
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144 * Returns the amount of blue in the color, from 0 to 255. |
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145 * |
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146 * @return the blue component of the color |
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147 * |
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148 * @exception DWTException <ul> |
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149 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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150 * </ul> |
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151 */ |
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152 public int getBlue() { |
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153 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
7 | 154 return cast(int)(handle[2] * 255); |
0
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155 } |
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156 |
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157 /** |
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158 * Returns the amount of green in the color, from 0 to 255. |
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159 * |
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160 * @return the green component of the color |
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161 * |
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162 * @exception DWTException <ul> |
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163 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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164 * </ul> |
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165 */ |
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166 public int getGreen() { |
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167 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
7 | 168 return cast(int)(handle[1] * 255); |
0
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169 } |
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170 |
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171 /** |
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172 * Returns the amount of red in the color, from 0 to 255. |
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173 * |
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174 * @return the red component of the color |
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175 * |
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176 * @exception DWTException <ul> |
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177 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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178 * </ul> |
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179 */ |
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180 public int getRed() { |
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181 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
7 | 182 return cast(int)(handle[0] * 255); |
0
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183 } |
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184 |
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185 /** |
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186 * Returns an integer hash code for the receiver. Any two |
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187 * objects that return <code>true</code> when passed to |
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188 * <code>equals</code> must return the same value for this |
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189 * method. |
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190 * |
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191 * @return the receiver's hash |
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192 * |
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193 * @see #equals |
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194 */ |
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195 public hash_t toHash() { |
0
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196 if (isDisposed()) return 0; |
7 | 197 return cast(int)(handle[0] * 255) ^ cast(int)(handle[1] * 255) ^ cast(int)(handle[2] * 255); |
0
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198 } |
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199 |
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200 alias toHash hashCode; |
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201 |
0
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202 /** |
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203 * Returns an <code>RGB</code> representing the receiver. |
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204 * |
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205 * @return the RGB for the color |
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206 * |
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207 * @exception DWTException <ul> |
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208 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> |
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209 * </ul> |
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210 */ |
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211 public RGB getRGB () { |
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212 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED); |
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213 return new RGB(getRed(), getGreen(), getBlue()); |
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214 } |
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215 |
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216 /** |
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217 * Invokes platform specific functionality to allocate a new color. |
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218 * <p> |
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219 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public |
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220 * API for <code>Color</code>. It is marked public only so that it |
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221 * can be shared within the packages provided by DWT. It is not |
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222 * available on all platforms, and should never be called from |
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223 * application code. |
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224 * </p> |
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225 * |
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226 * @param device the device on which to allocate the color |
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227 * @param handle the handle for the color |
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228 * |
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229 * @private |
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230 */ |
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231 public static Color cocoa_new(Device device, float[] rgbColor) { |
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232 Color color = new Color(device); |
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233 color.handle = rgbColor; |
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234 return color; |
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235 } |
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236 |
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237 void init(int red, int green, int blue) { |
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238 if ((red > 255) || (red < 0) || |
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239 (green > 255) || (green < 0) || |
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240 (blue > 255) || (blue < 0)) { |
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241 DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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242 } |
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243 float[] rgbColor = new float[4]; |
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244 rgbColor[0] = red / 255f; |
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245 rgbColor[1] = green / 255f; |
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246 rgbColor[2] = blue / 255f; |
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247 rgbColor[3] = 1; |
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248 handle = rgbColor; |
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249 } |
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250 |
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251 /** |
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252 * Returns <code>true</code> if the color has been disposed, |
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253 * and <code>false</code> otherwise. |
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254 * <p> |
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255 * This method gets the dispose state for the color. |
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256 * When a color has been disposed, it is an error to |
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257 * invoke any other method using the color. |
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258 * |
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259 * @return <code>true</code> when the color is disposed and <code>false</code> otherwise |
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260 */ |
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261 public bool isDisposed() { |
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262 return handle is null; |
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263 } |
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264 |
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265 /** |
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266 * Returns a string containing a concise, human-readable |
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267 * description of the receiver. |
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268 * |
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269 * @return a string representation of the receiver |
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270 */ |
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271 public String toString () { |
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272 if (isDisposed()) return "Color {*DISPOSED*}"; |
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273 return "Color {" ~ getRed() ~ ", " ~ getGreen() ~ ", " ~ getBlue() + "}"; |
0
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274 } |
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275 |
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276 } |