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annotate dwt/graphics/RGB.d @ 4:ab8b5765e3d1

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fix implements
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 13:51:50 +0200
parents 380af2bdd8e5
children 1a8b3cb347e0
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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.RGB;
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12
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13 import dwt.dwthelper.utils;
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14
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15 import dwt.DWT;
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16 import dwt.internal.SerializableCompatibility;
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17
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18 /**
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19 * Instances of this class are descriptions of colors in
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20 * terms of the primary additive color model (red, green and
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21 * blue). A color may be described in terms of the relative
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22 * intensities of these three primary colors. The brightness
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23 * of each color is specified by a value in the range 0 to 255,
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24 * where 0 indicates no color (blackness) and 255 indicates
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25 * maximum intensity.
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26 * <p>
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27 * The hashCode() method in this class uses the values of the public
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28 * fields to compute the hash value. When storing instances of the
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29 * class in hashed collections, do not modify these fields after the
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30 * object has been inserted.
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31 * </p>
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32 * <p>
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33 * Application code does <em>not</em> need to explicitly release the
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34 * resources managed by each instance when those instances are no longer
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35 * required, and thus no <code>dispose()</code> method is provided.
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36 * </p>
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37 *
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38 * @see Color
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39 */
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40
4
ab8b5765e3d1 fix implements
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41 public final class RGB : SerializableCompatibility {
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42
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43 /**
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44 * the red component of the RGB
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45 */
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46 public int red;
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47
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48 /**
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49 * the green component of the RGB
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50 */
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51 public int green;
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52
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53 /**
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54 * the blue component of the RGB
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55 */
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56 public int blue;
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57
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58 static final long serialVersionUID = 3258415023461249074L;
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59
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60 /**
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61 * Constructs an instance of this class with the given
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62 * red, green and blue values.
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63 *
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64 * @param red the red component of the new instance
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65 * @param green the green component of the new instance
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66 * @param blue the blue component of the new instance
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67 *
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68 * @exception IllegalArgumentException <ul>
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69 * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
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70 * </ul>
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71 */
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72 public RGB(int red, int green, int blue) {
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73 if ((red > 255) || (red < 0) ||
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74 (green > 255) || (green < 0) ||
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75 (blue > 255) || (blue < 0))
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76 DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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77 this.red = red;
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78 this.green = green;
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79 this.blue = blue;
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80 }
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81
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82 /**
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83 * Constructs an instance of this class with the given
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84 * hue, saturation, and brightness.
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85 *
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86 * @param hue the hue value for the HSB color (from 0 to 360)
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87 * @param saturation the saturation value for the HSB color (from 0 to 1)
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88 * @param brightness the brightness value for the HSB color (from 0 to 1)
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89 *
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90 * @exception IllegalArgumentException <ul>
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91 * <li>ERROR_INVALID_ARGUMENT - if the hue is not between 0 and 360 or
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92 * the saturation or brightness is not between 0 and 1</li>
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93 * </ul>
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94 *
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95 * @since 3.2
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96 */
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97 public RGB(float hue, float saturation, float brightness) {
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98 if (hue < 0 || hue > 360 || saturation < 0 || saturation > 1 ||
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99 brightness < 0 || brightness > 1) {
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100 DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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101 }
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102 float r, g, b;
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103 if (saturation is 0) {
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104 r = g = b = brightness;
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105 } else {
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106 if (hue is 360) hue = 0;
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107 hue /= 60;
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108 int i = (int)hue;
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109 float f = hue - i;
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110 float p = brightness * (1 - saturation);
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111 float q = brightness * (1 - saturation * f);
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112 float t = brightness * (1 - saturation * (1 - f));
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113 switch(i) {
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114 case 0:
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115 r = brightness;
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116 g = t;
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117 b = p;
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118 break;
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119 case 1:
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120 r = q;
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121 g = brightness;
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122 b = p;
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123 break;
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124 case 2:
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125 r = p;
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126 g = brightness;
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127 b = t;
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128 break;
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129 case 3:
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130 r = p;
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131 g = q;
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132 b = brightness;
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133 break;
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134 case 4:
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135 r = t;
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136 g = p;
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137 b = brightness;
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138 break;
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139 case 5:
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140 default:
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141 r = brightness;
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142 g = p;
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143 b = q;
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144 break;
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145 }
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146 }
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147 red = (int)(r * 255 + 0.5);
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148 green = (int)(g * 255 + 0.5);
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149 blue = (int)(b * 255 + 0.5);
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150 }
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151
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152 /**
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153 * Returns the hue, saturation, and brightness of the color.
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154 *
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155 * @return color space values in float format (hue, saturation, brightness)
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156 *
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157 * @since 3.2
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158 */
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159 public float[] getHSB() {
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160 float r = red / 255f;
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161 float g = green / 255f;
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162 float b = blue / 255f;
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163 float max = Math.max(Math.max(r, g), b);
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164 float min = Math.min(Math.min(r, g), b);
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165 float delta = max - min;
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166 float hue = 0;
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167 float brightness = max;
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168 float saturation = max is 0 ? 0 : (max - min) / max;
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169 if (delta !is 0) {
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170 if (r is max) {
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171 hue = (g - b) / delta;
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172 } else {
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173 if (g is max) {
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174 hue = 2 + (b - r) / delta;
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175 } else {
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176 hue = 4 + (r - g) / delta;
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177 }
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178 }
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179 hue *= 60;
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180 if (hue < 0) hue += 360;
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181 }
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182 return new float[] {hue, saturation, brightness};
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183 }
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184
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185 /**
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186 * Compares the argument to the receiver, and returns true
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187 * if they represent the <em>same</em> object using a class
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188 * specific comparison.
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189 *
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190 * @param object the object to compare with this object
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191 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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192 *
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193 * @see #hashCode()
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194 */
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195 public bool equals(Object object) {
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196 if (object is this) return true;
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197 if (!(object instanceof RGB)) return false;
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198 RGB rgb = (RGB)object;
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199 return (rgb.red is this.red) && (rgb.green is this.green) && (rgb.blue is this.blue);
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200 }
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201
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202 /**
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203 * Returns an integer hash code for the receiver. Any two
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204 * objects that return <code>true</code> when passed to
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205 * <code>equals</code> must return the same value for this
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206 * method.
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207 *
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208 * @return the receiver's hash
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209 *
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210 * @see #equals(Object)
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211 */
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212 public int hashCode() {
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213 return (blue << 16) | (green << 8) | red;
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214 }
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215
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216 /**
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217 * Returns a string containing a concise, human-readable
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218 * description of the receiver.
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219 *
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220 * @return a string representation of the <code>RGB</code>
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221 */
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222 public String toString() {
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223 return "RGB {" + red + ", " + green + ", " + blue + "}"; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
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224 }
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225
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226 }