Mercurial > projects > dwt-addons
annotate dwtx/jface/internal/text/revisions/Colors.d @ 150:5cf141e43417
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| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Sun, 24 Aug 2008 23:05:26 +0200 |
| parents | 51e6e63f930e |
| children | 25f1f92fa3df |
| rev | line source |
|---|---|
| 129 | 1 /******************************************************************************* |
| 2 * Copyright (c) 2006, 2007 IBM Corporation and others. | |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * Port to the D programming language: | |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 12 *******************************************************************************/ | |
| 13 module dwtx.jface.internal.text.revisions.Colors; | |
| 14 | |
| 131 | 15 import dwtx.jface.internal.text.revisions.HunkComputer; // packageimport |
| 16 import dwtx.jface.internal.text.revisions.LineIndexOutOfBoundsException; // packageimport | |
| 17 import dwtx.jface.internal.text.revisions.Hunk; // packageimport | |
| 18 import dwtx.jface.internal.text.revisions.ChangeRegion; // packageimport | |
| 19 import dwtx.jface.internal.text.revisions.Range; // packageimport | |
| 20 import dwtx.jface.internal.text.revisions.RevisionPainter; // packageimport | |
| 21 import dwtx.jface.internal.text.revisions.RevisionSelectionProvider; // packageimport | |
| 22 | |
| 23 | |
| 129 | 24 import dwt.dwthelper.utils; |
| 25 | |
| 26 | |
| 27 import dwt.DWT; | |
| 28 import dwt.graphics.RGB; | |
| 29 import dwtx.core.runtime.Assert; | |
| 30 | |
| 31 /** | |
| 32 * Utility for color operations. | |
| 150 | 33 * |
| 129 | 34 * @since 3.3 |
| 35 */ | |
| 36 public final class Colors { | |
| 37 /* | |
| 38 * Implementation note: Color computation assumes sRGB, which is probably not true, and does not | |
| 39 * always give good results. CIE based algorithms would be better, see | |
| 40 * http://www.w3.org/TR/PNG-ColorAppendix.html and http://en.wikipedia.org/wiki/Lab_color_space | |
| 41 */ | |
| 42 | |
| 43 /** | |
| 44 * Returns the human-perceived brightness of a color as float in [0.0, 1.0]. The used RGB | |
| 45 * weights come from http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC9. | |
| 150 | 46 * |
| 129 | 47 * @param rgb the color |
| 48 * @return the gray-scale value | |
| 49 */ | |
| 50 public static float brightness(RGB rgb) { | |
| 51 return Math.min(1f, (0.2126f * rgb.red + 0.7152f * rgb.green + 0.0722f * rgb.blue + 0.5f) / 255f); | |
| 52 } | |
| 53 | |
| 54 /** | |
| 55 * Normalizes a color in its perceived brightness. Yellows are darkened, while blues and reds | |
| 56 * are lightened. Depending on the hue, the brightness range within the RGB gamut may be | |
| 57 * different, outside values are clipped. Note that this is an approximation; the returned RGB | |
| 58 * is not guaranteed to have the requested {@link #brightness(RGB) brightness}. | |
| 150 | 59 * |
| 129 | 60 * @param color the color to normalize |
| 61 * @param brightness the requested brightness, in [0, 1] | |
| 62 * @return a normalized version of <code>color</code> | |
| 63 * @see #brightness(RGB) | |
| 64 */ | |
| 65 public static RGB adjustBrightness(RGB color, float brightness) { | |
| 66 float[] hsi= toHSI(color); | |
| 67 float psychoFactor= brightness - brightness(color); | |
| 68 float weight= 0.5f; // found by trial and error | |
| 69 hsi[2]= Math.max(0, Math.min(1.0f, hsi[2] + psychoFactor * weight)); | |
| 70 color= fromHSI(hsi); | |
| 71 return color; | |
| 72 } | |
| 73 | |
| 74 /** | |
| 75 * Converts an {@link RGB} to an <a href="http://en.wikipedia.org/wiki/HSL_color_space">HSI</a> | |
| 76 * triplet. | |
| 150 | 77 * |
| 129 | 78 * @param color the color to convert |
| 79 * @return the HSI float array of length 3 | |
| 80 */ | |
| 81 private static float[] toHSI(RGB color) { | |
| 82 float r = color.red / 255f; | |
| 83 float g = color.green / 255f; | |
| 84 float b = color.blue / 255f; | |
| 85 float max = Math.max(Math.max(r, g), b); | |
| 86 float min = Math.min(Math.min(r, g), b); | |
| 87 float delta = max - min; | |
| 88 float maxPlusMin= max + min; | |
| 89 float intensity = maxPlusMin / 2; | |
| 90 float saturation= intensity < 0.5 ? delta / maxPlusMin : delta / (2 - maxPlusMin); | |
| 91 | |
| 92 float hue = 0; | |
| 93 if (delta !is 0) { | |
| 94 if (r is max) { | |
| 95 hue = (g - b) / delta; | |
| 96 } else { | |
| 97 if (g is max) { | |
| 150 | 98 hue = 2 + (b - r) / delta; |
| 129 | 99 } else { |
| 100 hue = 4 + (r - g) / delta; | |
| 101 } | |
| 102 } | |
| 103 hue *= 60; | |
| 104 if (hue < 0) hue += 360; | |
| 105 } | |
| 150 | 106 return [hue, saturation, intensity]; |
| 129 | 107 } |
| 108 | |
| 109 /** | |
| 110 * Converts a <a href="http://en.wikipedia.org/wiki/HSL_color_space">HSI</a> triplet to an RGB. | |
| 150 | 111 * |
| 129 | 112 * @param hsi the HSI values |
| 113 * @return the RGB corresponding to the HSI spec | |
| 114 */ | |
| 115 private static RGB fromHSI(float[] hsi) { | |
| 116 float r, g, b; | |
| 117 float hue= hsi[0]; | |
| 118 float saturation= hsi[1]; | |
| 119 float intensity= hsi[2]; | |
| 120 if (saturation is 0) { | |
| 150 | 121 r = g = b = intensity; |
| 129 | 122 } else { |
| 123 float temp2= intensity < 0.5f ? intensity * (1.0f + saturation) : (intensity + saturation) - (intensity * saturation); | |
| 124 float temp1= 2f * intensity - temp2; | |
| 125 if (hue is 360) hue = 0; | |
| 126 hue /= 360; | |
| 127 | |
| 128 r= hue2RGB(temp1, temp2, hue + 1f/3f); | |
| 129 g= hue2RGB(temp1, temp2, hue); | |
| 130 b= hue2RGB(temp1, temp2, hue - 1f/3f); | |
| 131 } | |
| 132 | |
| 134 | 133 int red = cast(int)(r * 255 + 0.5); |
| 134 int green = cast(int)(g * 255 + 0.5); | |
| 150 | 135 int blue = cast(int)(b * 255 + 0.5); |
| 129 | 136 return new RGB(red, green, blue); |
| 137 } | |
| 138 | |
| 139 private static float hue2RGB(float t1, float t2, float hue) { | |
| 140 if (hue < 0) | |
| 141 hue += 1; | |
| 142 else if (hue > 1) | |
| 143 hue -= 1; | |
| 144 if (6f * hue < 1) | |
| 145 return t1 +(t2 - t1) * 6f * hue; | |
| 146 if (2f * hue < 1) | |
| 147 return t2; | |
| 148 if (3f * hue < 2) | |
| 149 return t1 + (t2 - t1) * (2f/3f - hue) * 6f; | |
| 150 return t1; | |
| 151 } | |
| 152 | |
| 153 /** | |
| 154 * Returns an RGB that lies between the given foreground and background | |
| 155 * colors using the given mixing factor. A <code>factor</code> of 1.0 will produce a | |
| 156 * color equal to <code>fg</code>, while a <code>factor</code> of 0.0 will produce one | |
| 157 * equal to <code>bg</code>. | |
| 158 * @param bg the background color | |
| 159 * @param fg the foreground color | |
| 160 * @param factor the mixing factor, must be in [0, 1] | |
| 150 | 161 * |
| 129 | 162 * @return the interpolated color |
| 163 */ | |
| 164 public static RGB blend(RGB bg, RGB fg, float factor) { | |
| 165 Assert.isLegal(bg !is null); | |
| 166 Assert.isLegal(fg !is null); | |
| 167 Assert.isLegal(factor >= 0f && factor <= 1f); | |
| 168 | |
| 169 float complement= 1f - factor; | |
| 170 return new RGB( | |
| 134 | 171 cast(int) (complement * bg.red + factor * fg.red), |
| 172 cast(int) (complement * bg.green + factor * fg.green), | |
| 173 cast(int) (complement * bg.blue + factor * fg.blue) | |
| 129 | 174 ); |
| 175 } | |
| 176 | |
| 177 /** | |
| 178 * Returns an array of colors in a smooth palette from <code>start</code> to <code>end</code>. | |
| 179 * <p> | |
| 180 * The returned array has size <code>steps</code>, and the color at index 0 is <code>start</code>, the color | |
| 181 * at index <code>steps - 1</code> is <code>end</code>. | |
| 150 | 182 * |
| 129 | 183 * @param start the start color of the palette |
| 184 * @param end the end color of the palette | |
| 185 * @param steps the requested size, must be > 0 | |
| 186 * @return an array of <code>steps</code> colors in the palette from <code>start</code> to <code>end</code> | |
| 187 */ | |
| 188 public static RGB[] palette(RGB start, RGB end, int steps) { | |
| 189 Assert.isLegal(start !is null); | |
| 190 Assert.isLegal(end !is null); | |
| 191 Assert.isLegal(steps > 0); | |
| 150 | 192 |
| 129 | 193 if (steps is 1) |
| 150 | 194 return [ start ]; |
| 129 | 195 |
| 196 float step= 1.0f / (steps - 1); | |
| 197 RGB[] gradient= new RGB[steps]; | |
| 198 for (int i= 0; i < steps; i++) | |
| 150 | 199 gradient[i]= blend(start, end, step * i); |
| 129 | 200 |
| 201 return gradient; | |
| 202 } | |
| 203 | |
| 204 /** | |
| 205 * Returns an array of colors with hues evenly distributed on the hue wheel defined by the <a | |
| 206 * href="http://en.wikipedia.org/wiki/HSV_color_space">HSB color space</a>. The returned array | |
| 207 * has size <code>steps</code>. The distance <var>d</var> between two successive colors is | |
| 208 * in [120°, 180°]. | |
| 209 * <p> | |
| 210 * The color at a given <code>index</code> has the hue returned by | |
| 211 * {@linkplain #computeHue(int) computeHue(index)}; i.e. the computed hues are not equidistant, | |
| 212 * but adaptively distributed on the color wheel. | |
| 213 * </p> | |
| 214 * <p> | |
| 215 * The first six colors returned correspond to the following {@link DWT} color constants: | |
| 216 * {@link DWT#COLOR_RED red}, {@link DWT#COLOR_GREEN green}, {@link DWT#COLOR_BLUE blue}, | |
| 217 * {@link DWT#COLOR_YELLOW yellow}, {@link DWT#COLOR_CYAN cyan}, | |
| 218 * {@link DWT#COLOR_MAGENTA magenta}. | |
| 219 * </p> | |
| 150 | 220 * |
| 129 | 221 * @param steps the requested size, must be >= 2 |
| 222 * @return an array of <code>steps</code> colors evenly distributed on the color wheel | |
| 223 */ | |
| 224 public static RGB[] rainbow(int steps) { | |
| 225 Assert.isLegal(steps >= 2); | |
| 226 | |
| 227 RGB[] rainbow= new RGB[steps]; | |
| 228 for (int i= 0; i < steps; i++) | |
| 229 rainbow[i]= new RGB(computeHue(i), 1f, 1f); | |
| 230 | |
| 231 return rainbow; | |
| 232 } | |
| 233 | |
| 234 /** | |
| 235 * Returns an indexed hue in [0°, 360°), distributing the hues evenly on the hue wheel | |
| 236 * defined by the <a href="http://en.wikipedia.org/wiki/HSV_color_space">HSB (or HSV) color | |
| 237 * space</a>. The distance <var>d</var> between two successive colors is in [120°, 180°]. | |
| 238 * <p> | |
| 239 * The first six colors returned correspond to the following {@link DWT} color constants: | |
| 240 * {@link DWT#COLOR_RED red}, {@link DWT#COLOR_GREEN green}, {@link DWT#COLOR_BLUE blue}, | |
| 241 * {@link DWT#COLOR_YELLOW yellow}, {@link DWT#COLOR_CYAN cyan}, | |
| 242 * {@link DWT#COLOR_MAGENTA magenta}. | |
| 243 * </p> | |
| 150 | 244 * |
| 129 | 245 * @param index the index of the color, must be >= 0 |
| 246 * @return a color hue in [0°, 360°) | |
| 247 * @see RGB#RGB(float, float, float) | |
| 248 */ | |
| 249 public static float computeHue(final int index) { | |
| 250 Assert.isLegal(index >= 0); | |
| 251 /* | |
| 252 * Base 3 gives a nice partitioning for RGB colors with red, green, blue being the colors | |
| 253 * 0,1,2, and yellow, cyan, magenta colors 3,4,5. | |
| 254 */ | |
| 150 | 255 final int base= 3; |
| 129 | 256 final float range= 360f; |
| 257 | |
| 258 // partition the baseRange by using the least significant bit to select one half of the | |
| 259 // partitioning | |
| 260 int baseIndex= index / base; | |
| 261 float baseRange= range / base; | |
| 262 float baseOffset= 0f; | |
| 263 while (baseIndex > 0) { | |
| 264 baseRange /= 2; | |
| 265 int lsb= baseIndex % 2; | |
| 266 baseOffset += lsb * baseRange; | |
| 267 baseIndex >>= 1; | |
| 268 } | |
| 269 | |
| 270 final int baseMod= index % base; | |
| 271 final float hue= baseOffset + baseMod * range / base; | |
| 272 Assert.isTrue(hue >= 0 && hue < 360); | |
| 273 return hue; | |
| 274 } | |
| 275 | |
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133
7d818bd32d63
Fix ctors to this with gvim regexp
Frank Benoit <benoit@tionex.de>
parents:
131
diff
changeset
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276 private this() { |
| 129 | 277 // not instantiatable |
| 278 } | |
| 279 | |
| 280 } |