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annotate dwt/graphics/Color.d @ 34:5123b17c98ef

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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sun, 14 Sep 2008 01:45:57 +0200
parents d408fc12b991
children db5a898b2119
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.graphics.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
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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 import dwt.internal.cocoa.CGFloat;
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25
0
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26 /**
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27 * Instances of this class manage the operating system resources that
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28 * implement DWT's RGB color model. To create a color you can either
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29 * specify the individual color components as integers in the range
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30 * 0 to 255 or provide an instance of an <code>RGB</code>.
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31 * <p>
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32 * Application code must explicitly invoke the <code>Color.dispose()</code>
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33 * method to release the operating system resources managed by each instance
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34 * when those instances are no longer required.
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35 * </p>
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36 *
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37 * @see RGB
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38 * @see Device#getSystemColor
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39 */
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40 public final class Color : Resource {
0
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41 /**
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42 * the handle to the OS color resource
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43 * (Warning: This field is platform dependent)
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44 * <p>
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45 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT
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46 * public API. It is marked public only so that it can be shared
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47 * within the packages provided by DWT. It is not available on all
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48 * platforms and should never be accessed from application code.
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49 * </p>
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50 */
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51 public CGFloat[] handle;
0
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52
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53 this(Device device) {
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54 super(device);
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55 }
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56
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57 /**
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58 * Constructs a new instance of this class given a device and the
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59 * desired red, green and blue values expressed as ints in the range
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60 * 0 to 255 (where 0 is black and 255 is full brightness). On limited
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61 * color devices, the color instance created by this call may not have
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62 * the same RGB values as the ones specified by the arguments. The
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63 * RGB values on the returned instance will be the color values of
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64 * the operating system color.
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65 * <p>
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66 * You must dispose the color when it is no longer required.
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67 * </p>
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68 *
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69 * @param device the device on which to allocate the color
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70 * @param red the amount of red in the color
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71 * @param green the amount of green in the color
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72 * @param blue the amount of blue in the color
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73 *
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74 * @exception IllegalArgumentException <ul>
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75 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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76 * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
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77 * </ul>
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78 *
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79 * @see #dispose
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80 */
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81 public this(Device device, int red, int green, int blue) {
0
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82 super(device);
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83 init(red, green, blue);
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84 init();
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85 }
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86
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87 /**
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88 * Constructs a new instance of this class given a device and an
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89 * <code>RGB</code> describing the desired red, green and blue values.
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90 * On limited color devices, the color instance created by this call
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91 * may not have the same RGB values as the ones specified by the
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92 * argument. The RGB values on the returned instance will be the color
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93 * values of the operating system color.
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94 * <p>
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95 * You must dispose the color when it is no longer required.
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96 * </p>
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97 *
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98 * @param device the device on which to allocate the color
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99 * @param rgb the RGB values of the desired color
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100 *
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101 * @exception IllegalArgumentException <ul>
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102 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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103 * <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
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104 * <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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105 * </ul>
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106 *
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107 * @see #dispose
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108 */
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109 public this(Device device, RGB rgb) {
0
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110 super(device);
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111 if (rgb is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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112 init(rgb.red, rgb.green, rgb.blue);
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113 init();
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114 }
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115
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116 void destroy() {
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117 handle = null;
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118 }
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119
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120 /**
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121 * Compares the argument to the receiver, and returns true
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122 * if they represent the <em>same</em> object using a class
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123 * specific comparison.
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124 *
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125 * @param object the object to compare with this object
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126 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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127 *
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128 * @see #hashCode
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129 */
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130 public bool equals(Object object) {
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131 if (object is this) return true;
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132 if (!( null !is cast(Color)object )) return false;
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133 Color color = cast(Color)object;
0
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134 float[] rgbColor = color.handle;
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135 if (handle is rgbColor) return true;
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136 return device is color.device &&
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137 cast(int)(handle[0] * 255) is cast(int)(rgbColor[0] * 255) &&
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138 cast(int)(handle[1] * 255) is cast(int)(rgbColor[1] * 255) &&
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139 cast(int)(handle[2] * 255) is cast(int)(rgbColor[2] * 255);
0
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140 }
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141
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142 alias equals opEquals;
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143
0
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144 /**
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145 * Returns the amount of blue in the color, from 0 to 255.
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146 *
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147 * @return the blue component of the color
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148 *
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149 * @exception DWTException <ul>
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150 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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151 * </ul>
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152 */
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153 public int getBlue() {
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154 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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155 return cast(int)(handle[2] * 255);
0
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156 }
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157
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158 /**
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159 * Returns the amount of green in the color, from 0 to 255.
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160 *
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161 * @return the green component of the color
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162 *
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163 * @exception DWTException <ul>
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164 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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165 * </ul>
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166 */
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167 public int getGreen() {
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168 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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169 return cast(int)(handle[1] * 255);
0
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170 }
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171
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172 /**
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173 * Returns the amount of red in the color, from 0 to 255.
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174 *
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175 * @return the red component of the color
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176 *
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177 * @exception DWTException <ul>
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178 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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179 * </ul>
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180 */
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181 public int getRed() {
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182 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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183 return cast(int)(handle[0] * 255);
0
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184 }
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185
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186 /**
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187 * Returns an integer hash code for the receiver. Any two
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188 * objects that return <code>true</code> when passed to
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189 * <code>equals</code> must return the same value for this
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190 * method.
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191 *
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192 * @return the receiver's hash
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193 *
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194 * @see #equals
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195 */
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196 public hash_t toHash() {
0
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197 if (isDisposed()) return 0;
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198 return cast(int)(handle[0] * 255) ^ cast(int)(handle[1] * 255) ^ cast(int)(handle[2] * 255);
0
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199 }
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200
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201 alias toHash hashCode;
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202
0
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203 /**
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204 * Returns an <code>RGB</code> representing the receiver.
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205 *
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206 * @return the RGB for the color
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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 RGB getRGB () {
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213 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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214 return new RGB(getRed(), getGreen(), getBlue());
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215 }
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216
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217 /**
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218 * Invokes platform specific functionality to allocate a new color.
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219 * <p>
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220 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
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221 * API for <code>Color</code>. It is marked public only so that it
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222 * can be shared within the packages provided by DWT. It is not
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223 * available on all platforms, and should never be called from
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224 * application code.
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225 * </p>
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226 *
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227 * @param device the device on which to allocate the color
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228 * @param handle the handle for the color
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229 *
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230 * @private
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231 */
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232 public static Color cocoa_new(Device device, float[] rgbColor) {
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233 Color color = new Color(device);
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234 color.handle = rgbColor;
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235 return color;
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236 }
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237
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238 void init(int red, int green, int blue) {
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239 if ((red > 255) || (red < 0) ||
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240 (green > 255) || (green < 0) ||
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241 (blue > 255) || (blue < 0)) {
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242 DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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243 }
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244 float[] rgbColor = new float[4];
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245 rgbColor[0] = red / 255f;
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246 rgbColor[1] = green / 255f;
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247 rgbColor[2] = blue / 255f;
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248 rgbColor[3] = 1;
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249 handle = rgbColor;
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250 }
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251
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252 /**
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253 * Returns <code>true</code> if the color has been disposed,
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254 * and <code>false</code> otherwise.
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255 * <p>
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256 * This method gets the dispose state for the color.
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257 * When a color has been disposed, it is an error to
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258 * invoke any other method using the color.
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259 *
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260 * @return <code>true</code> when the color is disposed and <code>false</code> otherwise
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261 */
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262 public bool isDisposed() {
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263 return handle is null;
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264 }
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265
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266 /**
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267 * Returns a string containing a concise, human-readable
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268 * description of the receiver.
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269 *
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270 * @return a string representation of the receiver
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271 */
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272 public String toString () {
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273 if (isDisposed()) return "Color {*DISPOSED*}";
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274 return "Color {" ~ getRed() ~ ", " ~ getGreen() ~ ", " ~ getBlue() + "}";
0
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275 }
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276
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277 }