| 1 | //␊ |
| 2 | // CTGradient.m␊ |
| 3 | //␊ |
| 4 | // Created by Chad Weider on 2/14/07.␊ |
| 5 | // Copyright (c) 2007 Chad Weider.␊ |
| 6 | // Some rights reserved: <http://creativecommons.org/licenses/by/2.5/>␊ |
| 7 | //␊ |
| 8 | // Version: 1.6␊ |
| 9 | ␊ |
| 10 | #import "CTGradient.h"␊ |
| 11 | ␊ |
| 12 | @interface CTGradient (Private)␊ |
| 13 | - (void)_commonInit;␊ |
| 14 | - (void)setBlendingMode:(CTGradientBlendingMode)mode;␊ |
| 15 | - (void)addElement:(CTGradientElement*)newElement;␊ |
| 16 | ␊ |
| 17 | - (CTGradientElement *)elementAtIndex:(unsigned)index;␊ |
| 18 | ␊ |
| 19 | - (CTGradientElement)removeElementAtIndex:(unsigned)index;␊ |
| 20 | - (CTGradientElement)removeElementAtPosition:(float)position;␊ |
| 21 | @end␊ |
| 22 | ␊ |
| 23 | //C Fuctions for color blending␊ |
| 24 | static void linearEvaluation (void *info, const float *in, float *out);␊ |
| 25 | static void chromaticEvaluation(void *info, const float *in, float *out);␊ |
| 26 | static void inverseChromaticEvaluation(void *info, const float *in, float *out);␊ |
| 27 | static void transformRGB_HSV(float *components);␊ |
| 28 | static void transformHSV_RGB(float *components);␊ |
| 29 | static void resolveHSV(float *color1, float *color2);␊ |
| 30 | ␊ |
| 31 | ␊ |
| 32 | @implementation CTGradient␊ |
| 33 | /////////////////////////////////////Initialization Type Stuff␊ |
| 34 | - (id)init␊ |
| 35 | {␊ |
| 36 | ␉self = [super init];␊ |
| 37 | ␉␊ |
| 38 | ␉if (self != nil)␊ |
| 39 | ␉{␊ |
| 40 | ␉␉[self _commonInit];␊ |
| 41 | ␉␉[self setBlendingMode:CTLinearBlendingMode];␊ |
| 42 | ␉}␊ |
| 43 | ␉return self;␊ |
| 44 | }␊ |
| 45 | ␊ |
| 46 | - (void)_commonInit␊ |
| 47 | {␊ |
| 48 | ␉elementList = nil;␊ |
| 49 | }␊ |
| 50 | ␊ |
| 51 | - (void)dealloc␊ |
| 52 | {␊ |
| 53 | ␉CGFunctionRelease(gradientFunction);␊ |
| 54 | ␉␊ |
| 55 | ␉CTGradientElement *elementToRemove = elementList;␊ |
| 56 | ␉while(elementList != nil)␊ |
| 57 | ␉{␊ |
| 58 | ␉␉elementToRemove = elementList;␊ |
| 59 | ␉␉elementList = elementList->nextElement;␊ |
| 60 | ␉␉free(elementToRemove);␊ |
| 61 | ␉}␊ |
| 62 | ␉␊ |
| 63 | ␉[super dealloc];␊ |
| 64 | }␊ |
| 65 | ␊ |
| 66 | - (id)copyWithZone:(NSZone *)zone␊ |
| 67 | {␊ |
| 68 | ␉CTGradient *copy = [[[self class] allocWithZone:zone] init];␊ |
| 69 | ␉␊ |
| 70 | ␉//now just copy my elementlist␊ |
| 71 | ␉CTGradientElement *currentElement = elementList;␊ |
| 72 | ␉while(currentElement != nil)␊ |
| 73 | ␉{␊ |
| 74 | ␉␉[copy addElement:currentElement];␊ |
| 75 | ␉␉currentElement = currentElement->nextElement;␊ |
| 76 | ␉}␊ |
| 77 | ␉␊ |
| 78 | ␉[copy setBlendingMode:blendingMode];␊ |
| 79 | ␉␊ |
| 80 | ␉return copy;␊ |
| 81 | }␊ |
| 82 | ␊ |
| 83 | - (void)encodeWithCoder:(NSCoder *)coder␊ |
| 84 | {␊ |
| 85 | ␉if([coder allowsKeyedCoding])␊ |
| 86 | ␉{␊ |
| 87 | ␉␉unsigned count = 0;␊ |
| 88 | ␉␉CTGradientElement *currentElement = elementList;␊ |
| 89 | ␉␉while(currentElement != nil)␊ |
| 90 | ␉␉{␊ |
| 91 | ␉␉␉[coder encodeValueOfObjCType:@encode(float) at:&(currentElement->red)];␊ |
| 92 | ␉␉␉[coder encodeValueOfObjCType:@encode(float) at:&(currentElement->green)];␊ |
| 93 | ␉␉␉[coder encodeValueOfObjCType:@encode(float) at:&(currentElement->blue)];␊ |
| 94 | ␉␉␉[coder encodeValueOfObjCType:@encode(float) at:&(currentElement->alpha)];␊ |
| 95 | ␉␉␉[coder encodeValueOfObjCType:@encode(float) at:&(currentElement->position)];␊ |
| 96 | ␉␉␉␊ |
| 97 | ␉␉␉count++;␊ |
| 98 | ␉␉␉currentElement = currentElement->nextElement;␊ |
| 99 | ␉␉}␊ |
| 100 | ␉␉[coder encodeInt:count forKey:@"CTGradientElementCount"];␊ |
| 101 | ␉␉[coder encodeInt:blendingMode forKey:@"CTGradientBlendingMode"];␊ |
| 102 | ␉}␊ |
| 103 | ␉else␊ |
| 104 | ␉␉[NSException raise:NSInvalidArchiveOperationException format:@"Only supports NSKeyedArchiver coders"];␊ |
| 105 | }␊ |
| 106 | ␊ |
| 107 | - (id)initWithCoder:(NSCoder *)coder␊ |
| 108 | {␊ |
| 109 | ␉[self _commonInit];␊ |
| 110 | ␉␊ |
| 111 | ␉[self setBlendingMode:[coder decodeIntForKey:@"CTGradientBlendingMode"]];␊ |
| 112 | ␉unsigned count = [coder decodeIntForKey:@"CTGradientElementCount"];␊ |
| 113 | ␉␊ |
| 114 | ␉while(count != 0)␊ |
| 115 | ␉{␊ |
| 116 | ␉␉CTGradientElement newElement;␊ |
| 117 | ␉␉␊ |
| 118 | ␉␉[coder decodeValueOfObjCType:@encode(float) at:&(newElement.red)];␊ |
| 119 | ␉␉[coder decodeValueOfObjCType:@encode(float) at:&(newElement.green)];␊ |
| 120 | ␉␉[coder decodeValueOfObjCType:@encode(float) at:&(newElement.blue)];␊ |
| 121 | ␉␉[coder decodeValueOfObjCType:@encode(float) at:&(newElement.alpha)];␊ |
| 122 | ␉␉[coder decodeValueOfObjCType:@encode(float) at:&(newElement.position)];␊ |
| 123 | ␉␉␊ |
| 124 | ␉␉count--;␊ |
| 125 | ␉␉[self addElement:&newElement];␊ |
| 126 | ␉}␊ |
| 127 | ␉return self;␊ |
| 128 | }␊ |
| 129 | #pragma mark -␊ |
| 130 | ␊ |
| 131 | ␊ |
| 132 | ␊ |
| 133 | #pragma mark Creation␊ |
| 134 | + (id)gradientWithBeginningColor:(NSColor *)begin endingColor:(NSColor *)end␊ |
| 135 | {␊ |
| 136 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 137 | ␉␊ |
| 138 | ␉CTGradientElement color1;␊ |
| 139 | ␉CTGradientElement color2;␊ |
| 140 | ␉␊ |
| 141 | ␉[[begin colorUsingColorSpaceName:NSCalibratedRGBColorSpace] getRed:&color1.red␊ |
| 142 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ green:&color1.green␊ |
| 143 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ blue:&color1.blue␊ |
| 144 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ alpha:&color1.alpha];␊ |
| 145 | ␉␊ |
| 146 | ␉[[end colorUsingColorSpaceName:NSCalibratedRGBColorSpace] getRed:&color2.red␊ |
| 147 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ green:&color2.green␊ |
| 148 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ blue:&color2.blue␊ |
| 149 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ alpha:&color2.alpha]; ␊ |
| 150 | ␉color1.position = 0;␊ |
| 151 | ␉color2.position = 1;␊ |
| 152 | ␉␊ |
| 153 | ␉[newInstance addElement:&color1];␊ |
| 154 | ␉[newInstance addElement:&color2];␊ |
| 155 | ␉␊ |
| 156 | ␉return [newInstance autorelease];␊ |
| 157 | }␊ |
| 158 | ␊ |
| 159 | ␊ |
| 160 | + (id)dividerGradient␊ |
| 161 | {␊ |
| 162 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 163 | ␉␊ |
| 164 | ␉CTGradientElement color1;␊ |
| 165 | ␉color1.red = color1.green = color1.blue = 0.84;␊ |
| 166 | ␉color1.alpha = 1.00;␊ |
| 167 | ␉color1.position = 0;␊ |
| 168 | ␉␊ |
| 169 | ␉CTGradientElement color2;␊ |
| 170 | ␉color2.red = color2.green = color2.blue = 0.90;␊ |
| 171 | ␉color2.alpha = 1.00;␊ |
| 172 | ␉color2.position = 0.5;␊ |
| 173 | ␉␊ |
| 174 | ␉CTGradientElement color3;␊ |
| 175 | ␉color3.red = color3.green = color3.blue = 0.84;␊ |
| 176 | ␉color3.alpha = 1.00;␊ |
| 177 | ␉color3.position = 1.0;␊ |
| 178 | ␉␊ |
| 179 | ␉[newInstance addElement:&color1];␊ |
| 180 | ␉[newInstance addElement:&color2];␊ |
| 181 | ␉[newInstance addElement:&color3];␊ |
| 182 | ␉␊ |
| 183 | ␉return [newInstance autorelease];␊ |
| 184 | }␊ |
| 185 | ␊ |
| 186 | ␊ |
| 187 | + (id)statusBarGradient␊ |
| 188 | {␊ |
| 189 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 190 | ␉␊ |
| 191 | ␉CTGradientElement color1;␊ |
| 192 | ␉color1.red = color1.green = color1.blue = 0.872;␊ |
| 193 | ␉color1.alpha = 1.00;␊ |
| 194 | ␉color1.position = 0;␊ |
| 195 | ␉␊ |
| 196 | ␉CTGradientElement color2;␊ |
| 197 | ␉color2.red = color2.green = color2.blue = 0.77;␊ |
| 198 | ␉color2.alpha = 1.00;␊ |
| 199 | ␉color2.position = 0.618;␊ |
| 200 | ␉␊ |
| 201 | ␉CTGradientElement color3;␊ |
| 202 | ␉color3.red = color3.green = color3.blue = 0.74;␊ |
| 203 | ␉color3.alpha = 1.00;␊ |
| 204 | ␉color3.position = 1.0;␊ |
| 205 | ␉␊ |
| 206 | ␉[newInstance addElement:&color1];␊ |
| 207 | ␉[newInstance addElement:&color2];␊ |
| 208 | ␉[newInstance addElement:&color3];␊ |
| 209 | ␉␊ |
| 210 | ␉return [newInstance autorelease];␊ |
| 211 | }␊ |
| 212 | ␊ |
| 213 | ␊ |
| 214 | + (id)aquaSelectedGradient␊ |
| 215 | {␊ |
| 216 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 217 | ␉␊ |
| 218 | ␉CTGradientElement color1;␊ |
| 219 | ␉color1.red = 0.58;␊ |
| 220 | ␉color1.green = 0.86;␊ |
| 221 | ␉color1.blue = 0.98;␊ |
| 222 | ␉color1.alpha = 1.00;␊ |
| 223 | ␉color1.position = 0;␊ |
| 224 | ␉␊ |
| 225 | ␉CTGradientElement color2;␊ |
| 226 | ␉color2.red = 0.42;␊ |
| 227 | ␉color2.green = 0.68;␊ |
| 228 | ␉color2.blue = 0.90;␊ |
| 229 | ␉color2.alpha = 1.00;␊ |
| 230 | ␉color2.position = 11.5/23;␊ |
| 231 | ␉␊ |
| 232 | ␉CTGradientElement color3;␊ |
| 233 | ␉color3.red = 0.64;␊ |
| 234 | ␉color3.green = 0.80;␊ |
| 235 | ␉color3.blue = 0.94;␊ |
| 236 | ␉color3.alpha = 1.00;␊ |
| 237 | ␉color3.position = 11.5/23;␊ |
| 238 | ␉␊ |
| 239 | ␉CTGradientElement color4;␊ |
| 240 | ␉color4.red = 0.56;␊ |
| 241 | ␉color4.green = 0.70;␊ |
| 242 | ␉color4.blue = 0.90;␊ |
| 243 | ␉color4.alpha = 1.00;␊ |
| 244 | ␉color4.position = 1;␊ |
| 245 | ␉␊ |
| 246 | ␉[newInstance addElement:&color1];␊ |
| 247 | ␉[newInstance addElement:&color2];␊ |
| 248 | ␉[newInstance addElement:&color3];␊ |
| 249 | ␉[newInstance addElement:&color4];␊ |
| 250 | ␉␊ |
| 251 | ␉return [newInstance autorelease];␊ |
| 252 | }␊ |
| 253 | ␊ |
| 254 | + (id)aquaNormalGradient␊ |
| 255 | {␊ |
| 256 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 257 | ␉␊ |
| 258 | ␉CTGradientElement color1;␊ |
| 259 | ␉color1.red = color1.green = color1.blue = 0.95;␊ |
| 260 | ␉color1.alpha = 1.00;␊ |
| 261 | ␉color1.position = 0;␊ |
| 262 | ␉␊ |
| 263 | ␉CTGradientElement color2;␊ |
| 264 | ␉color2.red = color2.green = color2.blue = 0.83;␊ |
| 265 | ␉color2.alpha = 1.00;␊ |
| 266 | ␉color2.position = 11.5/23;␊ |
| 267 | ␉␊ |
| 268 | ␉CTGradientElement color3;␊ |
| 269 | ␉color3.red = color3.green = color3.blue = 0.95;␊ |
| 270 | ␉color3.alpha = 1.00;␊ |
| 271 | ␉color3.position = 11.5/23;␊ |
| 272 | ␉␊ |
| 273 | ␉CTGradientElement color4;␊ |
| 274 | ␉color4.red = color4.green = color4.blue = 0.92;␊ |
| 275 | ␉color4.alpha = 1.00;␊ |
| 276 | ␉color4.position = 1;␊ |
| 277 | ␉␊ |
| 278 | ␉[newInstance addElement:&color1];␊ |
| 279 | ␉[newInstance addElement:&color2];␊ |
| 280 | ␉[newInstance addElement:&color3];␊ |
| 281 | ␉[newInstance addElement:&color4];␊ |
| 282 | ␉␊ |
| 283 | ␉return [newInstance autorelease];␊ |
| 284 | }␊ |
| 285 | ␊ |
| 286 | + (id)aquaPressedGradient␊ |
| 287 | {␊ |
| 288 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 289 | ␉␊ |
| 290 | ␉CTGradientElement color1;␊ |
| 291 | ␉color1.red = color1.green = color1.blue = 0.80;␊ |
| 292 | ␉color1.alpha = 1.00;␊ |
| 293 | ␉color1.position = 0;␊ |
| 294 | ␉␊ |
| 295 | ␉CTGradientElement color2;␊ |
| 296 | ␉color2.red = color2.green = color2.blue = 0.64;␊ |
| 297 | ␉color2.alpha = 1.00;␊ |
| 298 | ␉color2.position = 11.5/23;␊ |
| 299 | ␉␊ |
| 300 | ␉CTGradientElement color3;␊ |
| 301 | ␉color3.red = color3.green = color3.blue = 0.80;␊ |
| 302 | ␉color3.alpha = 1.00;␊ |
| 303 | ␉color3.position = 11.5/23;␊ |
| 304 | ␉␊ |
| 305 | ␉CTGradientElement color4;␊ |
| 306 | ␉color4.red = color4.green = color4.blue = 0.77;␊ |
| 307 | ␉color4.alpha = 1.00;␊ |
| 308 | ␉color4.position = 1;␊ |
| 309 | ␉␊ |
| 310 | ␉[newInstance addElement:&color1];␊ |
| 311 | ␉[newInstance addElement:&color2];␊ |
| 312 | ␉[newInstance addElement:&color3];␊ |
| 313 | ␉[newInstance addElement:&color4];␊ |
| 314 | ␉␊ |
| 315 | ␉return [newInstance autorelease];␊ |
| 316 | }␊ |
| 317 | ␊ |
| 318 | + (id)unifiedSelectedGradient␊ |
| 319 | {␊ |
| 320 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 321 | ␉␊ |
| 322 | ␉CTGradientElement color1;␊ |
| 323 | ␉color1.red = color1.green = color1.blue = 0.85;␊ |
| 324 | ␉color1.alpha = 1.00;␊ |
| 325 | ␉color1.position = 0;␊ |
| 326 | ␉␊ |
| 327 | ␉CTGradientElement color2;␊ |
| 328 | ␉color2.red = color2.green = color2.blue = 0.95;␊ |
| 329 | ␉color2.alpha = 1.00;␊ |
| 330 | ␉color2.position = 1;␊ |
| 331 | ␉␊ |
| 332 | ␉[newInstance addElement:&color1];␊ |
| 333 | ␉[newInstance addElement:&color2];␊ |
| 334 | ␉␊ |
| 335 | ␉return [newInstance autorelease];␊ |
| 336 | }␊ |
| 337 | ␊ |
| 338 | + (id)unifiedNormalGradient␊ |
| 339 | {␊ |
| 340 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 341 | ␉␊ |
| 342 | ␉CTGradientElement color1;␊ |
| 343 | ␉color1.red = color1.green = color1.blue = 0.75;␊ |
| 344 | ␉color1.alpha = 1.00;␊ |
| 345 | ␉color1.position = 0;␊ |
| 346 | ␉␊ |
| 347 | ␉CTGradientElement color2;␊ |
| 348 | ␉color2.red = color2.green = color2.blue = 0.90;␊ |
| 349 | ␉color2.alpha = 1.00;␊ |
| 350 | ␉color2.position = 1;␊ |
| 351 | ␉␊ |
| 352 | ␉[newInstance addElement:&color1];␊ |
| 353 | ␉[newInstance addElement:&color2];␊ |
| 354 | ␉␊ |
| 355 | ␉return [newInstance autorelease];␊ |
| 356 | }␊ |
| 357 | ␊ |
| 358 | + (id)unifiedPressedGradient␊ |
| 359 | {␊ |
| 360 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 361 | ␉␊ |
| 362 | ␉CTGradientElement color1;␊ |
| 363 | ␉color1.red = color1.green = color1.blue = 0.60;␊ |
| 364 | ␉color1.alpha = 1.00;␊ |
| 365 | ␉color1.position = 0;␊ |
| 366 | ␉␊ |
| 367 | ␉CTGradientElement color2;␊ |
| 368 | ␉color2.red = color2.green = color2.blue = 0.75;␊ |
| 369 | ␉color2.alpha = 1.00;␊ |
| 370 | ␉color2.position = 1;␊ |
| 371 | ␉␊ |
| 372 | ␉[newInstance addElement:&color1];␊ |
| 373 | ␉[newInstance addElement:&color2];␊ |
| 374 | ␉␊ |
| 375 | ␉return [newInstance autorelease];␊ |
| 376 | }␊ |
| 377 | ␊ |
| 378 | + (id)unifiedDarkGradient␊ |
| 379 | {␊ |
| 380 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 381 | ␉␊ |
| 382 | ␉CTGradientElement color1;␊ |
| 383 | ␉color1.red = color1.green = color1.blue = 0.68;␊ |
| 384 | ␉color1.alpha = 1.00;␊ |
| 385 | ␉color1.position = 0;␊ |
| 386 | ␉␊ |
| 387 | ␉CTGradientElement color2;␊ |
| 388 | ␉color2.red = color2.green = color2.blue = 0.83;␊ |
| 389 | ␉color2.alpha = 1.00;␊ |
| 390 | ␉color2.position = 1;␊ |
| 391 | ␉␊ |
| 392 | ␉[newInstance addElement:&color1];␊ |
| 393 | ␉[newInstance addElement:&color2];␊ |
| 394 | ␉␊ |
| 395 | ␉return [newInstance autorelease];␊ |
| 396 | }␊ |
| 397 | ␊ |
| 398 | + (id)sourceListSelectedGradient␊ |
| 399 | {␊ |
| 400 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 401 | ␉␊ |
| 402 | ␉CTGradientElement color1;␊ |
| 403 | ␉color1.red = 0.06;␊ |
| 404 | ␉color1.green = 0.37;␊ |
| 405 | ␉color1.blue = 0.85;␊ |
| 406 | ␉color1.alpha = 1.00;␊ |
| 407 | ␉color1.position = 0;␊ |
| 408 | ␉␊ |
| 409 | ␉CTGradientElement color2;␊ |
| 410 | ␉color2.red = 0.30;␊ |
| 411 | ␉color2.green = 0.60;␊ |
| 412 | ␉color2.blue = 0.92;␊ |
| 413 | ␉color2.alpha = 1.00;␊ |
| 414 | ␉color2.position = 1;␊ |
| 415 | ␉␊ |
| 416 | ␉[newInstance addElement:&color1];␊ |
| 417 | ␉[newInstance addElement:&color2];␊ |
| 418 | ␉␊ |
| 419 | ␉return [newInstance autorelease];␊ |
| 420 | }␊ |
| 421 | ␊ |
| 422 | + (id)sourceListUnselectedGradient␊ |
| 423 | {␊ |
| 424 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 425 | ␉␊ |
| 426 | ␉CTGradientElement color1;␊ |
| 427 | ␉color1.red = 0.43;␊ |
| 428 | ␉color1.green = 0.43;␊ |
| 429 | ␉color1.blue = 0.43;␊ |
| 430 | ␉color1.alpha = 1.00;␊ |
| 431 | ␉color1.position = 0;␊ |
| 432 | ␉␊ |
| 433 | ␉CTGradientElement color2;␊ |
| 434 | ␉color2.red = 0.60;␊ |
| 435 | ␉color2.green = 0.60;␊ |
| 436 | ␉color2.blue = 0.60;␊ |
| 437 | ␉color2.alpha = 1.00;␊ |
| 438 | ␉color2.position = 1;␊ |
| 439 | ␉␊ |
| 440 | ␉[newInstance addElement:&color1];␊ |
| 441 | ␉[newInstance addElement:&color2];␊ |
| 442 | ␉␊ |
| 443 | ␉return [newInstance autorelease];␊ |
| 444 | }␊ |
| 445 | ␊ |
| 446 | + (id)rainbowGradient␊ |
| 447 | {␊ |
| 448 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 449 | ␉␊ |
| 450 | ␉CTGradientElement color1;␊ |
| 451 | ␉color1.red = 1.00;␊ |
| 452 | ␉color1.green = 0.00;␊ |
| 453 | ␉color1.blue = 0.00;␊ |
| 454 | ␉color1.alpha = 1.00;␊ |
| 455 | ␉color1.position = 0.0;␊ |
| 456 | ␉␊ |
| 457 | ␉CTGradientElement color2;␊ |
| 458 | ␉color2.red = 0.54;␊ |
| 459 | ␉color2.green = 0.00;␊ |
| 460 | ␉color2.blue = 1.00;␊ |
| 461 | ␉color2.alpha = 1.00;␊ |
| 462 | ␉color2.position = 1.0;␊ |
| 463 | ␊ |
| 464 | ␉[newInstance addElement:&color1];␊ |
| 465 | ␉[newInstance addElement:&color2];␊ |
| 466 | ␉␊ |
| 467 | ␉[newInstance setBlendingMode:CTChromaticBlendingMode];␊ |
| 468 | ␉␊ |
| 469 | ␉return [newInstance autorelease];␊ |
| 470 | }␊ |
| 471 | ␊ |
| 472 | + (id)hydrogenSpectrumGradient␊ |
| 473 | {␊ |
| 474 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 475 | ␉␊ |
| 476 | ␉struct {float hue; float position; float width;} colorBands[4];␊ |
| 477 | ␉␊ |
| 478 | ␉colorBands[0].hue = 22;␊ |
| 479 | ␉colorBands[0].position = .145;␊ |
| 480 | ␉colorBands[0].width = .01;␊ |
| 481 | ␉␊ |
| 482 | ␉colorBands[1].hue = 200;␊ |
| 483 | ␉colorBands[1].position = .71;␊ |
| 484 | ␉colorBands[1].width = .008;␊ |
| 485 | ␉␊ |
| 486 | ␉colorBands[2].hue = 253;␊ |
| 487 | ␉colorBands[2].position = .885;␊ |
| 488 | ␉colorBands[2].width = .005;␊ |
| 489 | ␉␊ |
| 490 | ␉colorBands[3].hue = 275;␊ |
| 491 | ␉colorBands[3].position = .965;␊ |
| 492 | ␉colorBands[3].width = .003;␊ |
| 493 | ␉␊ |
| 494 | ␉int i;␊ |
| 495 | ␉/////////////////////////////␊ |
| 496 | ␉for(i = 0; i < 4; i++)␊ |
| 497 | ␉{␉␊ |
| 498 | ␉␉float color[4];␊ |
| 499 | ␉␉color[0] = colorBands[i].hue - 180*colorBands[i].width;␊ |
| 500 | ␉␉color[1] = 1;␊ |
| 501 | ␉␉color[2] = 0.001;␊ |
| 502 | ␉␉color[3] = 1;␊ |
| 503 | ␉␉transformHSV_RGB(color);␊ |
| 504 | ␉␉CTGradientElement fadeIn;␊ |
| 505 | ␉␉fadeIn.red = color[0];␊ |
| 506 | ␉␉fadeIn.green = color[1];␊ |
| 507 | ␉␉fadeIn.blue = color[2];␊ |
| 508 | ␉␉fadeIn.alpha = color[3];␊ |
| 509 | ␉␉fadeIn.position = colorBands[i].position - colorBands[i].width;␊ |
| 510 | ␉␉␊ |
| 511 | ␉␉␊ |
| 512 | ␉␉color[0] = colorBands[i].hue;␊ |
| 513 | ␉␉color[1] = 1;␊ |
| 514 | ␉␉color[2] = 1;␊ |
| 515 | ␉␉color[3] = 1;␊ |
| 516 | ␉␉transformHSV_RGB(color);␊ |
| 517 | ␉␉CTGradientElement band;␊ |
| 518 | ␉␉band.red = color[0];␊ |
| 519 | ␉␉band.green = color[1];␊ |
| 520 | ␉␉band.blue = color[2];␊ |
| 521 | ␉␉band.alpha = color[3];␊ |
| 522 | ␉␉band.position = colorBands[i].position;␊ |
| 523 | ␉␉␊ |
| 524 | ␉␉color[0] = colorBands[i].hue + 180*colorBands[i].width;␊ |
| 525 | ␉␉color[1] = 1;␊ |
| 526 | ␉␉color[2] = 0.001;␊ |
| 527 | ␉␉color[3] = 1;␊ |
| 528 | ␉␉transformHSV_RGB(color);␊ |
| 529 | ␉␉CTGradientElement fadeOut;␊ |
| 530 | ␉␉fadeOut.red = color[0];␊ |
| 531 | ␉␉fadeOut.green = color[1];␊ |
| 532 | ␉␉fadeOut.blue = color[2];␊ |
| 533 | ␉␉fadeOut.alpha = color[3];␊ |
| 534 | ␉␉fadeOut.position = colorBands[i].position + colorBands[i].width;␊ |
| 535 | ␉␉␊ |
| 536 | ␉␉␊ |
| 537 | ␉␉[newInstance addElement:&fadeIn];␊ |
| 538 | ␉␉[newInstance addElement:&band];␊ |
| 539 | ␉␉[newInstance addElement:&fadeOut];␊ |
| 540 | ␉}␊ |
| 541 | ␉␊ |
| 542 | ␉[newInstance setBlendingMode:CTChromaticBlendingMode];␊ |
| 543 | ␉␊ |
| 544 | ␉return [newInstance autorelease];␊ |
| 545 | }␊ |
| 546 | ␊ |
| 547 | #pragma mark -␊ |
| 548 | ␊ |
| 549 | ␊ |
| 550 | ␊ |
| 551 | #pragma mark Modification␊ |
| 552 | - (CTGradient *)gradientWithAlphaComponent:(float)alpha␊ |
| 553 | {␊ |
| 554 | ␉id newInstance = [[[self class] alloc] init];␊ |
| 555 | ␉␊ |
| 556 | ␉CTGradientElement *curElement = elementList;␊ |
| 557 | ␉CTGradientElement tempElement;␊ |
| 558 | ␉␊ |
| 559 | ␉while(curElement != nil)␊ |
| 560 | ␉{␊ |
| 561 | ␉␉tempElement = *curElement;␊ |
| 562 | ␉␉tempElement.alpha = alpha;␊ |
| 563 | ␉␉[newInstance addElement:&tempElement];␊ |
| 564 | ␉␉␊ |
| 565 | ␉␉curElement = curElement->nextElement;␊ |
| 566 | ␉}␊ |
| 567 | ␉␊ |
| 568 | ␉return [newInstance autorelease];␊ |
| 569 | }␊ |
| 570 | ␊ |
| 571 | - (CTGradient *)gradientWithBlendingMode:(CTGradientBlendingMode)mode␊ |
| 572 | {␊ |
| 573 | ␉CTGradient *newGradient = [self copy]; ␊ |
| 574 | ␉␊ |
| 575 | ␉[newGradient setBlendingMode:mode];␊ |
| 576 | ␉␊ |
| 577 | ␉return [newGradient autorelease];␊ |
| 578 | }␊ |
| 579 | ␊ |
| 580 | ␊ |
| 581 | //Adds a color stop with <color> at <position> in elementList␊ |
| 582 | //(if two elements are at the same position then added imediatly after the one that was there already)␊ |
| 583 | - (CTGradient *)addColorStop:(NSColor *)color atPosition:(float)position␊ |
| 584 | {␊ |
| 585 | ␉CTGradient *newGradient = [self copy];␊ |
| 586 | ␉CTGradientElement newGradientElement;␊ |
| 587 | ␉␊ |
| 588 | ␉//put the components of color into the newGradientElement - must make sure it is a RGB color (not Gray or CMYK) ␊ |
| 589 | ␉[[color colorUsingColorSpaceName:NSCalibratedRGBColorSpace] getRed:&newGradientElement.red␊ |
| 590 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ green:&newGradientElement.green␊ |
| 591 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ blue:&newGradientElement.blue␊ |
| 592 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉ alpha:&newGradientElement.alpha];␊ |
| 593 | ␉newGradientElement.position = position;␊ |
| 594 | ␉␊ |
| 595 | ␉//Pass it off to addElement to take care of adding it to the elementList␊ |
| 596 | ␉[newGradient addElement:&newGradientElement];␊ |
| 597 | ␉␊ |
| 598 | ␉return [newGradient autorelease];␊ |
| 599 | }␊ |
| 600 | ␊ |
| 601 | ␊ |
| 602 | //Removes the color stop at <position> from elementList␊ |
| 603 | - (CTGradient *)removeColorStopAtPosition:(float)position␊ |
| 604 | {␊ |
| 605 | ␉CTGradient *newGradient = [self copy];␊ |
| 606 | ␉CTGradientElement removedElement = [newGradient removeElementAtPosition:position];␊ |
| 607 | ␉␊ |
| 608 | ␉if(isnan(removedElement.position))␊ |
| 609 | ␉␉[NSException raise:NSRangeException format:@"-[%@ removeColorStopAtPosition:]: no such colorStop at position (%f)", [self class], position];␊ |
| 610 | ␉␊ |
| 611 | ␉return [newGradient autorelease];␊ |
| 612 | }␊ |
| 613 | ␊ |
| 614 | - (CTGradient *)removeColorStopAtIndex:(unsigned)index␊ |
| 615 | {␊ |
| 616 | ␉CTGradient *newGradient = [self copy];␊ |
| 617 | ␉CTGradientElement removedElement = [newGradient removeElementAtIndex:index];␊ |
| 618 | ␉␊ |
| 619 | ␉if(isnan(removedElement.position))␊ |
| 620 | ␉␉[NSException raise:NSRangeException format:@"-[%@ removeColorStopAtIndex:]: index (%i) beyond bounds", [self class], index];␊ |
| 621 | ␉␊ |
| 622 | ␉return [newGradient autorelease];␊ |
| 623 | }␊ |
| 624 | #pragma mark -␊ |
| 625 | ␊ |
| 626 | ␊ |
| 627 | ␊ |
| 628 | #pragma mark Information␊ |
| 629 | - (CTGradientBlendingMode)blendingMode␊ |
| 630 | {␊ |
| 631 | ␉return blendingMode;␊ |
| 632 | }␊ |
| 633 | ␊ |
| 634 | //Returns color at <position> in gradient␊ |
| 635 | - (NSColor *)colorStopAtIndex:(unsigned)index␊ |
| 636 | {␊ |
| 637 | ␉CTGradientElement *element = [self elementAtIndex:index];␊ |
| 638 | ␉␊ |
| 639 | ␉if(element != nil)␊ |
| 640 | ␉␉return [NSColor colorWithCalibratedRed:element->red ␊ |
| 641 | ␉␉␉␉␉␉␉␉␉␉ green:element->green␊ |
| 642 | ␉␉␉␉␉␉␉␉␉␉ blue:element->blue␊ |
| 643 | ␉␉␉␉␉␉␉␉␉␉ alpha:element->alpha];␊ |
| 644 | ␉␊ |
| 645 | ␉[NSException raise:NSRangeException format:@"-[%@ removeColorStopAtIndex:]: index (%i) beyond bounds", [self class], index];␊ |
| 646 | ␉␊ |
| 647 | ␉return nil;␊ |
| 648 | }␊ |
| 649 | ␊ |
| 650 | - (NSColor *)colorAtPosition:(float)position␊ |
| 651 | {␊ |
| 652 | ␉float components[4];␊ |
| 653 | ␉␊ |
| 654 | ␉switch(blendingMode)␊ |
| 655 | ␉{␊ |
| 656 | ␉␉case CTLinearBlendingMode:␊ |
| 657 | ␉␉␉linearEvaluation(&elementList, &position, components);␉␉␉␉break;␊ |
| 658 | ␉␉case CTChromaticBlendingMode:␊ |
| 659 | ␉␉␉chromaticEvaluation(&elementList, &position, components);␉␉␉break;␊ |
| 660 | ␉␉case CTInverseChromaticBlendingMode:␊ |
| 661 | ␉␉␉inverseChromaticEvaluation(&elementList, &position, components);␉break;␊ |
| 662 | ␉}␊ |
| 663 | ␉␊ |
| 664 | ␉␊ |
| 665 | ␉return [NSColor colorWithCalibratedRed:components[0]␊ |
| 666 | ␉␉␉␉␉␉␉␉␉ green:components[1]␊ |
| 667 | ␉␉␉␉␉␉␉␉␉ blue:components[2]␊ |
| 668 | ␉␉␉␉␉␉␉␉␉ alpha:components[3]];␊ |
| 669 | }␊ |
| 670 | #pragma mark -␊ |
| 671 | ␊ |
| 672 | ␊ |
| 673 | ␊ |
| 674 | #pragma mark Drawing␊ |
| 675 | - (void)drawSwatchInRect:(NSRect)rect␊ |
| 676 | {␊ |
| 677 | ␉[self fillRect:rect angle:45];␊ |
| 678 | }␊ |
| 679 | ␊ |
| 680 | - (void)fillRect:(NSRect)rect angle:(float)angle␊ |
| 681 | {␊ |
| 682 | ␉//First Calculate where the beginning and ending points should be␊ |
| 683 | ␉CGPoint startPoint;␊ |
| 684 | ␉CGPoint endPoint;␊ |
| 685 | ␉␊ |
| 686 | ␉if(angle == 0)␉␉//screw the calculations - we know the answer␊ |
| 687 | ␉{␊ |
| 688 | ␉␉startPoint = CGPointMake(NSMinX(rect), NSMinY(rect));␉//right of rect␊ |
| 689 | ␉␉endPoint = CGPointMake(NSMaxX(rect), NSMinY(rect));␉//left of rect␊ |
| 690 | ␉}␊ |
| 691 | ␉else if(angle == 90)␉//same as above␊ |
| 692 | ␉{␊ |
| 693 | ␉␉startPoint = CGPointMake(NSMinX(rect), NSMinY(rect));␉//bottom of rect␊ |
| 694 | ␉␉endPoint = CGPointMake(NSMinX(rect), NSMaxY(rect));␉//top of rect␊ |
| 695 | ␉}␊ |
| 696 | ␉else␉␉␉␉␉␉//ok, we'll do the calculations now ␊ |
| 697 | ␉{␊ |
| 698 | ␉␉float x,y;␊ |
| 699 | ␉␉float sina, cosa, tana;␊ |
| 700 | ␉␉␊ |
| 701 | ␉␉float length;␊ |
| 702 | ␉␉float deltax,␊ |
| 703 | ␉␉deltay;␊ |
| 704 | ␉␉␊ |
| 705 | ␉␉float rangle = angle * pi/180;␉//convert the angle to radians␊ |
| 706 | ␉␉␊ |
| 707 | ␉␉if(fabsf(tan(rangle))<=1)␉//for range [-45,45], [135,225]␊ |
| 708 | ␉␉{␊ |
| 709 | ␉␉␉x = NSWidth(rect);␊ |
| 710 | ␉␉␉y = NSHeight(rect);␊ |
| 711 | ␉␉␉␊ |
| 712 | ␉␉␉sina = sin(rangle);␊ |
| 713 | ␉␉␉cosa = cos(rangle);␊ |
| 714 | ␉␉␉tana = tan(rangle);␊ |
| 715 | ␉␉␉␊ |
| 716 | ␉␉␉length = x/fabsf(cosa)+(y-x*fabsf(tana))*fabsf(sina);␊ |
| 717 | ␉␉␉␊ |
| 718 | ␉␉␉deltax = length*cosa/2;␊ |
| 719 | ␉␉␉deltay = length*sina/2;␊ |
| 720 | ␉␉}␊ |
| 721 | ␉␉else␉␉␉␉␉␉//for range [45,135], [225,315]␊ |
| 722 | ␉␉{␊ |
| 723 | ␉␉␉x = NSHeight(rect);␊ |
| 724 | ␉␉␉y = NSWidth(rect);␊ |
| 725 | ␉␉␉␊ |
| 726 | ␉␉␉sina = sin(rangle - 90*pi/180);␊ |
| 727 | ␉␉␉cosa = cos(rangle - 90*pi/180);␊ |
| 728 | ␉␉␉tana = tan(rangle - 90*pi/180);␊ |
| 729 | ␉␉␉␊ |
| 730 | ␉␉␉length = x/fabsf(cosa)+(y-x*fabsf(tana))*fabsf(sina);␊ |
| 731 | ␉␉␉␊ |
| 732 | ␉␉␉deltax =-length*sina/2;␊ |
| 733 | ␉␉␉deltay = length*cosa/2;␊ |
| 734 | ␉␉}␊ |
| 735 | ␉␉␊ |
| 736 | ␉␉startPoint = CGPointMake(NSMidX(rect)-deltax, NSMidY(rect)-deltay);␊ |
| 737 | ␉␉endPoint = CGPointMake(NSMidX(rect)+deltax, NSMidY(rect)+deltay);␊ |
| 738 | ␉}␊ |
| 739 | ␉␊ |
| 740 | ␉//Calls to CoreGraphics␊ |
| 741 | ␉CGContextRef currentContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];␊ |
| 742 | ␉CGContextSaveGState(currentContext);␊ |
| 743 | #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4␊ |
| 744 | ␉CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);␊ |
| 745 | #else␊ |
| 746 | ␉CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();␊ |
| 747 | #endif␊ |
| 748 | ␉CGShadingRef myCGShading = CGShadingCreateAxial(colorspace, startPoint, endPoint, gradientFunction, false, false);␊ |
| 749 | ␉␊ |
| 750 | ␉CGContextClipToRect (currentContext, *(CGRect *)&rect);␉//This is where the action happens␊ |
| 751 | ␉CGContextDrawShading(currentContext, myCGShading);␊ |
| 752 | ␉␊ |
| 753 | ␉CGShadingRelease(myCGShading);␊ |
| 754 | ␉CGColorSpaceRelease(colorspace );␊ |
| 755 | ␉CGContextRestoreGState(currentContext);␊ |
| 756 | }␊ |
| 757 | ␊ |
| 758 | - (void)radialFillRect:(NSRect)rect␊ |
| 759 | {␊ |
| 760 | ␉CGPoint startPoint , endPoint;␊ |
| 761 | ␉float startRadius, endRadius;␊ |
| 762 | ␉float scalex, scaley, transx, transy;␊ |
| 763 | ␉␊ |
| 764 | ␉startPoint = endPoint = CGPointMake(NSMidX(rect), NSMidY(rect));␊ |
| 765 | ␉␊ |
| 766 | ␉startRadius = -1;␊ |
| 767 | ␉if(NSHeight(rect)>NSWidth(rect))␊ |
| 768 | ␉{␊ |
| 769 | ␉␉scalex = NSWidth(rect)/NSHeight(rect);␊ |
| 770 | ␉␉transx = (NSHeight(rect)-NSWidth(rect))/2;␊ |
| 771 | ␉␉scaley = 1;␊ |
| 772 | ␉␉transy = 1;␊ |
| 773 | ␉␉endRadius = NSHeight(rect)/2;␊ |
| 774 | ␉}␊ |
| 775 | ␉else␊ |
| 776 | ␉{␊ |
| 777 | ␉␉scalex = 1;␊ |
| 778 | ␉␉transx = 1;␊ |
| 779 | ␉␉scaley = NSHeight(rect)/NSWidth(rect);␊ |
| 780 | ␉␉transy = (NSWidth(rect)-NSHeight(rect))/2;␊ |
| 781 | ␉␉endRadius = NSWidth(rect)/2;␊ |
| 782 | ␉}␊ |
| 783 | ␉␊ |
| 784 | ␉//Calls to CoreGraphics␊ |
| 785 | ␉CGContextRef currentContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];␊ |
| 786 | ␉CGContextSaveGState(currentContext);␊ |
| 787 | #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4␊ |
| 788 | ␉CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);␊ |
| 789 | #else␊ |
| 790 | ␉CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();␊ |
| 791 | #endif␊ |
| 792 | ␉CGShadingRef myCGShading = CGShadingCreateRadial(colorspace, startPoint, startRadius, endPoint, endRadius, gradientFunction, true, true);␊ |
| 793 | ␉␊ |
| 794 | ␉CGContextClipToRect (currentContext, *(CGRect *)&rect);␊ |
| 795 | ␉CGContextScaleCTM (currentContext, scalex, scaley);␊ |
| 796 | ␉CGContextTranslateCTM(currentContext, transx, transy);␊ |
| 797 | ␉CGContextDrawShading (currentContext, myCGShading);␉␉//This is where the action happens␊ |
| 798 | ␉␊ |
| 799 | ␉CGShadingRelease(myCGShading);␊ |
| 800 | ␉CGColorSpaceRelease(colorspace);␊ |
| 801 | ␉CGContextRestoreGState(currentContext);␊ |
| 802 | }␊ |
| 803 | ␊ |
| 804 | - (void)fillBezierPath:(NSBezierPath *)path angle:(float)angle␊ |
| 805 | {␊ |
| 806 | ␉NSGraphicsContext *currentContext = [NSGraphicsContext currentContext];␊ |
| 807 | ␉[currentContext saveGraphicsState];␊ |
| 808 | ␉NSAffineTransform *transform = [[NSAffineTransform alloc] init];␊ |
| 809 | ␉␊ |
| 810 | ␉[transform rotateByDegrees:-angle];␊ |
| 811 | ␉[path transformUsingAffineTransform:transform];␊ |
| 812 | ␉[transform invert];␊ |
| 813 | ␉[transform concat];␊ |
| 814 | ␉␊ |
| 815 | ␉[path addClip];␊ |
| 816 | ␉[self fillRect:[path bounds] angle:0];␊ |
| 817 | ␉[path transformUsingAffineTransform:transform];␊ |
| 818 | ␉[transform release];␊ |
| 819 | ␉[currentContext restoreGraphicsState];␊ |
| 820 | }␊ |
| 821 | - (void)radialFillBezierPath:(NSBezierPath *)path␊ |
| 822 | {␊ |
| 823 | ␉NSGraphicsContext *currentContext = [NSGraphicsContext currentContext];␊ |
| 824 | ␉[currentContext saveGraphicsState];␊ |
| 825 | ␉[path addClip];␊ |
| 826 | ␉[self radialFillRect:[path bounds]];␊ |
| 827 | ␉[currentContext restoreGraphicsState];␊ |
| 828 | }␊ |
| 829 | #pragma mark -␊ |
| 830 | ␊ |
| 831 | ␊ |
| 832 | ␊ |
| 833 | #pragma mark Private Methods␊ |
| 834 | - (void)setBlendingMode:(CTGradientBlendingMode)mode;␊ |
| 835 | {␊ |
| 836 | ␉blendingMode = mode;␊ |
| 837 | ␉␊ |
| 838 | ␉//Choose what blending function to use␊ |
| 839 | ␉void *evaluationFunction;␊ |
| 840 | ␉switch(blendingMode)␊ |
| 841 | ␉{␊ |
| 842 | ␉␉case CTLinearBlendingMode:␊ |
| 843 | ␉␉␉evaluationFunction = &linearEvaluation;␉␉␉break;␊ |
| 844 | ␉␉case CTChromaticBlendingMode:␊ |
| 845 | ␉␉␉evaluationFunction = &chromaticEvaluation;␉␉␉break;␊ |
| 846 | ␉␉case CTInverseChromaticBlendingMode:␊ |
| 847 | ␉␉␉evaluationFunction = &inverseChromaticEvaluation;␉break;␊ |
| 848 | ␉}␊ |
| 849 | ␉␊ |
| 850 | ␉//replace the current CoreGraphics Function with new one␊ |
| 851 | ␉if(gradientFunction != NULL)␊ |
| 852 | ␉␉CGFunctionRelease(gradientFunction);␊ |
| 853 | ␊ |
| 854 | ␉CGFunctionCallbacks evaluationCallbackInfo = {0 , evaluationFunction, NULL};␉//Version, evaluator function, cleanup function␊ |
| 855 | ␉␊ |
| 856 | ␉static const float input_value_range [2] = { 0, 1 };␉␉␉␉␉␉//range for the evaluator input␊ |
| 857 | ␉static const float output_value_ranges [8] = { 0, 1, 0, 1, 0, 1, 0, 1 };␉␉//ranges for the evaluator output (4 returned values)␊ |
| 858 | ␉␊ |
| 859 | ␉gradientFunction = CGFunctionCreate(&elementList,␉␉␉␉␉//the two transition colors␊ |
| 860 | ␉␉␉␉␉␉␉␉␉␉1, input_value_range ,␉␉//number of inputs (just fraction of progression)␊ |
| 861 | ␉␉␉␉␉␉␉␉␉␉4, output_value_ranges,␉␉//number of outputs (4 - RGBa)␊ |
| 862 | ␉␉␉␉␉␉␉␉␉␉&evaluationCallbackInfo);␉␉//info for using the evaluator function␊ |
| 863 | }␊ |
| 864 | ␊ |
| 865 | - (void)addElement:(CTGradientElement *)newElement␊ |
| 866 | {␊ |
| 867 | ␉if(elementList == nil || newElement->position < elementList->position)␉//inserting at beginning of list␊ |
| 868 | ␉{␊ |
| 869 | ␉␉CTGradientElement *tmpNext = elementList;␊ |
| 870 | ␉␉elementList = malloc(sizeof(CTGradientElement));␊ |
| 871 | ␉␉*elementList = *newElement;␊ |
| 872 | ␉␉elementList->nextElement = tmpNext;␊ |
| 873 | ␉}␊ |
| 874 | ␉else␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉//inserting somewhere inside list␊ |
| 875 | ␉{␊ |
| 876 | ␉␉CTGradientElement *curElement = elementList;␊ |
| 877 | ␉␉␊ |
| 878 | ␉␉while(curElement->nextElement != nil && !((curElement->position <= newElement->position) && (newElement->position < curElement->nextElement->position)))␊ |
| 879 | ␉␉{␊ |
| 880 | ␉␉␉curElement = curElement->nextElement;␊ |
| 881 | ␉␉}␊ |
| 882 | ␉␉␊ |
| 883 | ␉␉CTGradientElement *tmpNext = curElement->nextElement;␊ |
| 884 | ␉␉curElement->nextElement = malloc(sizeof(CTGradientElement));␊ |
| 885 | ␉␉*(curElement->nextElement) = *newElement;␊ |
| 886 | ␉␉curElement->nextElement->nextElement = tmpNext;␊ |
| 887 | ␉}␊ |
| 888 | }␊ |
| 889 | ␊ |
| 890 | - (CTGradientElement)removeElementAtIndex:(unsigned)index␊ |
| 891 | {␊ |
| 892 | ␉CTGradientElement removedElement;␊ |
| 893 | ␉␊ |
| 894 | ␉if(elementList != nil)␊ |
| 895 | ␉{␊ |
| 896 | ␉␉if(index == 0)␊ |
| 897 | ␉␉{␊ |
| 898 | ␉␉␉CTGradientElement *tmpNext = elementList;␊ |
| 899 | ␉␉␉elementList = elementList->nextElement;␊ |
| 900 | ␉␉␉␊ |
| 901 | ␉␉␉removedElement = *tmpNext;␊ |
| 902 | ␉␉␉free(tmpNext);␊ |
| 903 | ␉␉␉␊ |
| 904 | ␉␉␉return removedElement;␊ |
| 905 | ␉␉}␊ |
| 906 | ␉␉␊ |
| 907 | ␉␉unsigned count = 1;␉␉//we want to start one ahead␊ |
| 908 | ␉␉CTGradientElement *currentElement = elementList;␊ |
| 909 | ␉␉while(currentElement->nextElement != nil)␊ |
| 910 | ␉␉{␊ |
| 911 | ␉␉␉if(count == index)␊ |
| 912 | ␉␉␉{␊ |
| 913 | ␉␉␉␉CTGradientElement *tmpNext = currentElement->nextElement;␊ |
| 914 | ␉␉␉␉currentElement->nextElement = currentElement->nextElement->nextElement;␊ |
| 915 | ␉␉␉␉␊ |
| 916 | ␉␉␉␉removedElement = *tmpNext;␊ |
| 917 | ␉␉␉␉free(tmpNext);␊ |
| 918 | ␉␉␉␉␊ |
| 919 | ␉␉␉␉return removedElement;␊ |
| 920 | ␉␉␉}␊ |
| 921 | ␉␉␉␊ |
| 922 | ␉␉␉count++;␊ |
| 923 | ␉␉␉currentElement = currentElement->nextElement;␊ |
| 924 | ␉␉}␊ |
| 925 | ␉}␊ |
| 926 | ␉␊ |
| 927 | ␉//element is not found, return empty element␊ |
| 928 | ␉removedElement.red = 0.0;␊ |
| 929 | ␉removedElement.green = 0.0;␊ |
| 930 | ␉removedElement.blue = 0.0;␊ |
| 931 | ␉removedElement.alpha = 0.0;␊ |
| 932 | ␉removedElement.position = NAN;␊ |
| 933 | ␉removedElement.nextElement = nil;␊ |
| 934 | ␉␊ |
| 935 | ␉return removedElement;␊ |
| 936 | }␊ |
| 937 | ␊ |
| 938 | - (CTGradientElement)removeElementAtPosition:(float)position␊ |
| 939 | {␊ |
| 940 | ␉CTGradientElement removedElement;␊ |
| 941 | ␉␊ |
| 942 | ␉if(elementList != nil)␊ |
| 943 | ␉{␊ |
| 944 | ␉␉if(elementList->position == position)␊ |
| 945 | ␉␉{␊ |
| 946 | ␉␉␉CTGradientElement *tmpNext = elementList;␊ |
| 947 | ␉␉␉elementList = elementList->nextElement;␊ |
| 948 | ␉␉␉␊ |
| 949 | ␉␉␉removedElement = *tmpNext;␊ |
| 950 | ␉␉␉free(tmpNext);␊ |
| 951 | ␉␉␉␊ |
| 952 | ␉␉␉return removedElement;␊ |
| 953 | ␉␉}␊ |
| 954 | ␉␉else␊ |
| 955 | ␉␉{␊ |
| 956 | ␉␉␉CTGradientElement *curElement = elementList;␊ |
| 957 | ␉␉␉while(curElement->nextElement != nil)␊ |
| 958 | ␉␉␉{␊ |
| 959 | ␉␉␉␉if(curElement->nextElement->position == position)␊ |
| 960 | ␉␉␉␉{␊ |
| 961 | ␉␉␉␉␉CTGradientElement *tmpNext = curElement->nextElement;␊ |
| 962 | ␉␉␉␉␉curElement->nextElement = curElement->nextElement->nextElement;␊ |
| 963 | ␉␉␉␉␉␊ |
| 964 | ␉␉␉␉␉removedElement = *tmpNext;␊ |
| 965 | ␉␉␉␉␉free(tmpNext);␊ |
| 966 | ␉␉␉␉␉␊ |
| 967 | ␉␉␉␉␉return removedElement;␊ |
| 968 | ␉␉␉␉}␊ |
| 969 | ␉␉␉}␊ |
| 970 | ␉␉}␊ |
| 971 | ␉}␊ |
| 972 | ␉␊ |
| 973 | ␉//element is not found, return empty element␊ |
| 974 | ␉removedElement.red = 0.0;␊ |
| 975 | ␉removedElement.green = 0.0;␊ |
| 976 | ␉removedElement.blue = 0.0;␊ |
| 977 | ␉removedElement.alpha = 0.0;␊ |
| 978 | ␉removedElement.position = NAN;␊ |
| 979 | ␉removedElement.nextElement = nil;␊ |
| 980 | ␉␊ |
| 981 | ␉return removedElement;␊ |
| 982 | }␊ |
| 983 | ␊ |
| 984 | ␊ |
| 985 | - (CTGradientElement *)elementAtIndex:(unsigned)index;␉␉␉␊ |
| 986 | {␊ |
| 987 | ␉unsigned count = 0;␊ |
| 988 | ␉CTGradientElement *currentElement = elementList;␊ |
| 989 | ␉␊ |
| 990 | ␉while(currentElement != nil)␊ |
| 991 | ␉{␊ |
| 992 | ␉␉if(count == index)␊ |
| 993 | ␉␉␉return currentElement;␊ |
| 994 | ␉␉␊ |
| 995 | ␉␉count++;␊ |
| 996 | ␉␉currentElement = currentElement->nextElement;␊ |
| 997 | ␉}␊ |
| 998 | ␉␊ |
| 999 | ␉return nil;␊ |
| 1000 | }␊ |
| 1001 | #pragma mark -␊ |
| 1002 | ␊ |
| 1003 | ␊ |
| 1004 | ␊ |
| 1005 | #pragma mark Core Graphics␊ |
| 1006 | //////////////////////////////////////Blending Functions/////////////////////////////////////␊ |
| 1007 | void linearEvaluation (void *info, const float *in, float *out)␊ |
| 1008 | {␊ |
| 1009 | ␉float position = *in;␊ |
| 1010 | ␉␊ |
| 1011 | ␉if(*(CTGradientElement **)info == nil)␉//if elementList is empty return clear color␊ |
| 1012 | ␉{␊ |
| 1013 | ␉␉out[0] = out[1] = out[2] = out[3] = 1;␊ |
| 1014 | ␉␉return;␊ |
| 1015 | ␉}␊ |
| 1016 | ␉␊ |
| 1017 | ␉//This grabs the first two colors in the sequence␊ |
| 1018 | ␉CTGradientElement *color1 = *(CTGradientElement **)info;␊ |
| 1019 | ␉CTGradientElement *color2 = color1->nextElement;␊ |
| 1020 | ␉␊ |
| 1021 | ␉//make sure first color and second color are on other sides of position␊ |
| 1022 | ␉while(color2 != nil && color2->position < position)␊ |
| 1023 | ␉{␊ |
| 1024 | ␉␉color1 = color2;␊ |
| 1025 | ␉␉color2 = color1->nextElement;␊ |
| 1026 | ␉}␊ |
| 1027 | ␉//if we don't have another color then make next color the same color␊ |
| 1028 | ␉if(color2 == nil)␊ |
| 1029 | {␊ |
| 1030 | ␉␉color2 = color1;␊ |
| 1031 | }␊ |
| 1032 | ␉␊ |
| 1033 | ␉//----------FailSafe settings----------␊ |
| 1034 | ␉//color1->red = 1; color2->red = 0;␊ |
| 1035 | ␉//color1->green = 1; color2->green = 0;␊ |
| 1036 | ␉//color1->blue = 1; color2->blue = 0;␊ |
| 1037 | ␉//color1->alpha = 1; color2->alpha = 1;␊ |
| 1038 | ␉//color1->position = .5;␊ |
| 1039 | ␉//color2->position = .5;␊ |
| 1040 | ␉//-------------------------------------␊ |
| 1041 | ␉␊ |
| 1042 | ␉if(position <= color1->position)␉␉␉//Make all below color color1's position equal to color1␊ |
| 1043 | ␉{␊ |
| 1044 | ␉␉out[0] = color1->red; ␊ |
| 1045 | ␉␉out[1] = color1->green;␊ |
| 1046 | ␉␉out[2] = color1->blue;␊ |
| 1047 | ␉␉out[3] = color1->alpha;␊ |
| 1048 | ␉}␊ |
| 1049 | ␉else if (position >= color2->position)␉//Make all above color color2's position equal to color2␊ |
| 1050 | ␉{␊ |
| 1051 | ␉␉out[0] = color2->red; ␊ |
| 1052 | ␉␉out[1] = color2->green;␊ |
| 1053 | ␉␉out[2] = color2->blue;␊ |
| 1054 | ␉␉out[3] = color2->alpha;␊ |
| 1055 | ␉}␊ |
| 1056 | ␉else␉␉␉␉␉␉␉␉␉␉//Interpolate color at postions between color1 and color1␊ |
| 1057 | ␉{␊ |
| 1058 | ␉␉//adjust position so that it goes from 0 to 1 in the range from color 1 & 2's position ␊ |
| 1059 | ␉␉position = (position-color1->position)/(color2->position - color1->position);␊ |
| 1060 | ␉␉␊ |
| 1061 | ␉␉out[0] = (color2->red - color1->red )*position + color1->red; ␊ |
| 1062 | ␉␉out[1] = (color2->green - color1->green)*position + color1->green;␊ |
| 1063 | ␉␉out[2] = (color2->blue - color1->blue )*position + color1->blue;␊ |
| 1064 | ␉␉out[3] = (color2->alpha - color1->alpha)*position + color1->alpha;␊ |
| 1065 | ␉}␊ |
| 1066 | }␊ |
| 1067 | ␊ |
| 1068 | ␊ |
| 1069 | ␊ |
| 1070 | ␊ |
| 1071 | //Chromatic Evaluation - ␊ |
| 1072 | //␉This blends colors by their Hue, Saturation, and Value(Brightness) right now I just ␊ |
| 1073 | //␉transform the RGB values stored in the CTGradientElements to HSB, in the future I may␊ |
| 1074 | //␉streamline it to avoid transforming in and out of HSB colorspace *for later*␊ |
| 1075 | //␊ |
| 1076 | //␉For the chromatic blend we shift the hue of color1 to meet the hue of color2. To do␊ |
| 1077 | //␉this we will add to the hue's angle (if we subtract we'll be doing the inverse␊ |
| 1078 | //␉chromatic...scroll down more for that). All we need to do is keep adding to the hue␊ |
| 1079 | // until we wrap around the colorwheel and get to color2.␊ |
| 1080 | void chromaticEvaluation(void *info, const float *in, float *out)␊ |
| 1081 | {␊ |
| 1082 | ␉float position = *in;␊ |
| 1083 | ␉␊ |
| 1084 | ␉if(*(CTGradientElement **)info == nil)␉//if elementList is empty return clear color␊ |
| 1085 | ␉{␊ |
| 1086 | ␉␉out[0] = out[1] = out[2] = out[3] = 1;␊ |
| 1087 | ␉␉return;␊ |
| 1088 | ␉}␊ |
| 1089 | ␉␊ |
| 1090 | ␉//This grabs the first two colors in the sequence␊ |
| 1091 | ␉CTGradientElement *color1 = *(CTGradientElement **)info;␊ |
| 1092 | ␉CTGradientElement *color2 = color1->nextElement;␊ |
| 1093 | ␉␊ |
| 1094 | ␉float c1[4];␊ |
| 1095 | ␉float c2[4];␊ |
| 1096 | ␊ |
| 1097 | ␉//make sure first color and second color are on other sides of position␊ |
| 1098 | ␉while(color2 != nil && color2->position < position)␊ |
| 1099 | ␉{␊ |
| 1100 | ␉␉color1 = color2;␊ |
| 1101 | ␉␉color2 = color1->nextElement;␊ |
| 1102 | ␉}␊ |
| 1103 | ␉//if we don't have another color then make next color the same color␊ |
| 1104 | ␉if(color2 == nil)␊ |
| 1105 | {␊ |
| 1106 | ␉␉color2 = color1;␊ |
| 1107 | }␊ |
| 1108 | ␉␊ |
| 1109 | ␉␊ |
| 1110 | ␉c1[0] = color1->red; ␊ |
| 1111 | ␉c1[1] = color1->green;␊ |
| 1112 | ␉c1[2] = color1->blue;␊ |
| 1113 | ␉c1[3] = color1->alpha;␊ |
| 1114 | ␉␊ |
| 1115 | ␉c2[0] = color2->red; ␊ |
| 1116 | ␉c2[1] = color2->green;␊ |
| 1117 | ␉c2[2] = color2->blue;␊ |
| 1118 | ␉c2[3] = color2->alpha;␊ |
| 1119 | ␉␊ |
| 1120 | ␉transformRGB_HSV(c1);␊ |
| 1121 | ␉transformRGB_HSV(c2);␊ |
| 1122 | ␉resolveHSV(c1,c2);␊ |
| 1123 | ␉␊ |
| 1124 | ␉if(c1[0] > c2[0]) //if color1's hue is higher than color2's hue then ␊ |
| 1125 | ␉␉c2[0] += 360;␉//␉we need to move c2 one revolution around the wheel␊ |
| 1126 | ␉␊ |
| 1127 | ␉␊ |
| 1128 | ␉if(position <= color1->position)␉␉␉//Make all below color color1's position equal to color1␊ |
| 1129 | ␉{␊ |
| 1130 | ␉␉out[0] = c1[0]; ␊ |
| 1131 | ␉␉out[1] = c1[1];␊ |
| 1132 | ␉␉out[2] = c1[2];␊ |
| 1133 | ␉␉out[3] = c1[3];␊ |
| 1134 | ␉}␊ |
| 1135 | ␉else if (position >= color2->position)␉//Make all above color color2's position equal to color2␊ |
| 1136 | ␉{␊ |
| 1137 | ␉␉out[0] = c2[0]; ␊ |
| 1138 | ␉␉out[1] = c2[1];␊ |
| 1139 | ␉␉out[2] = c2[2];␊ |
| 1140 | ␉␉out[3] = c2[3];␊ |
| 1141 | ␉}␊ |
| 1142 | ␉else␉␉␉␉␉␉␉␉␉␉//Interpolate color at postions between color1 and color1␊ |
| 1143 | ␉{␊ |
| 1144 | ␉␉//adjust position so that it goes from 0 to 1 in the range from color 1 & 2's position ␊ |
| 1145 | ␉␉position = (position-color1->position)/(color2->position - color1->position);␊ |
| 1146 | ␉␉␊ |
| 1147 | ␉␉out[0] = (c2[0] - c1[0])*position + c1[0]; ␊ |
| 1148 | ␉␉out[1] = (c2[1] - c1[1])*position + c1[1];␊ |
| 1149 | ␉␉out[2] = (c2[2] - c1[2])*position + c1[2];␊ |
| 1150 | ␉␉out[3] = (c2[3] - c1[3])*position + c1[3];␊ |
| 1151 | ␉}␊ |
| 1152 | ␊ |
| 1153 | ␉transformHSV_RGB(out);␊ |
| 1154 | }␊ |
| 1155 | ␊ |
| 1156 | ␊ |
| 1157 | ␊ |
| 1158 | //Inverse Chromatic Evaluation - ␊ |
| 1159 | //␉Inverse Chromatic is about the same story as Chromatic Blend, but here the Hue␊ |
| 1160 | //␉is strictly decreasing, that is we need to get from color1 to color2 by decreasing␊ |
| 1161 | |
| 1162 | |
| 1163 | void inverseChromaticEvaluation(void *info, const float *in, float *out)␊ |
| 1164 | {␊ |
| 1165 | float position = *in;␊ |
| 1166 | ␉␊ |
| 1167 | ␉if(*(CTGradientElement **)info == nil)␉//if elementList is empty return clear color␊ |
| 1168 | ␉{␊ |
| 1169 | ␉␉out[0] = out[1] = out[2] = out[3] = 1;␊ |
| 1170 | ␉␉return;␊ |
| 1171 | ␉}␊ |
| 1172 | ␉␊ |
| 1173 | ␉//This grabs the first two colors in the sequence␊ |
| 1174 | ␉CTGradientElement *color1 = *(CTGradientElement **)info;␊ |
| 1175 | ␉CTGradientElement *color2 = color1->nextElement;␊ |
| 1176 | ␉␊ |
| 1177 | ␉float c1[4];␊ |
| 1178 | ␉float c2[4];␊ |
| 1179 | ␉␊ |
| 1180 | ␉//make sure first color and second color are on other sides of position␊ |
| 1181 | ␉while(color2 != nil && color2->position < position)␊ |
| 1182 | ␉{␊ |
| 1183 | ␉␉color1 = color2;␊ |
| 1184 | ␉␉color2 = color1->nextElement;␊ |
| 1185 | ␉}␊ |
| 1186 | ␉//if we don't have another color then make next color the same color␊ |
| 1187 | ␉if(color2 == nil)␊ |
| 1188 | {␊ |
| 1189 | ␉␉color2 = color1;␊ |
| 1190 | }␊ |
| 1191 | ␉␊ |
| 1192 | ␉c1[0] = color1->red; ␊ |
| 1193 | ␉c1[1] = color1->green;␊ |
| 1194 | ␉c1[2] = color1->blue;␊ |
| 1195 | ␉c1[3] = color1->alpha;␊ |
| 1196 | ␉␊ |
| 1197 | ␉c2[0] = color2->red; ␊ |
| 1198 | ␉c2[1] = color2->green;␊ |
| 1199 | ␉c2[2] = color2->blue;␊ |
| 1200 | ␉c2[3] = color2->alpha;␊ |
| 1201 | ␉␊ |
| 1202 | ␉transformRGB_HSV(c1);␊ |
| 1203 | ␉transformRGB_HSV(c2);␊ |
| 1204 | ␉resolveHSV(c1,c2);␊ |
| 1205 | ␉␊ |
| 1206 | ␉if(c1[0] < c2[0]) //if color1's hue is higher than color2's hue then ␊ |
| 1207 | ␉␉c1[0] += 360;␉//␉we need to move c2 one revolution back on the wheel␊ |
| 1208 | ␉␊ |
| 1209 | ␉␊ |
| 1210 | ␉if(position <= color1->position)␉␉␉//Make all below color color1's position equal to color1␊ |
| 1211 | ␉{␊ |
| 1212 | ␉␉out[0] = c1[0]; ␊ |
| 1213 | ␉␉out[1] = c1[1];␊ |
| 1214 | ␉␉out[2] = c1[2];␊ |
| 1215 | ␉␉out[3] = c1[3];␊ |
| 1216 | ␉}␊ |
| 1217 | ␉else if (position >= color2->position)␉//Make all above color color2's position equal to color2␊ |
| 1218 | ␉{␊ |
| 1219 | ␉␉out[0] = c2[0]; ␊ |
| 1220 | ␉␉out[1] = c2[1];␊ |
| 1221 | ␉␉out[2] = c2[2];␊ |
| 1222 | ␉␉out[3] = c2[3];␊ |
| 1223 | ␉}␊ |
| 1224 | ␉else␉␉␉␉␉␉␉␉␉␉//Interpolate color at postions between color1 and color1␊ |
| 1225 | ␉{␊ |
| 1226 | ␉␉//adjust position so that it goes from 0 to 1 in the range from color 1 & 2's position ␊ |
| 1227 | ␉␉position = (position-color1->position)/(color2->position - color1->position);␊ |
| 1228 | ␉␉␊ |
| 1229 | ␉␉out[0] = (c2[0] - c1[0])*position + c1[0]; ␊ |
| 1230 | ␉␉out[1] = (c2[1] - c1[1])*position + c1[1];␊ |
| 1231 | ␉␉out[2] = (c2[2] - c1[2])*position + c1[2];␊ |
| 1232 | ␉␉out[3] = (c2[3] - c1[3])*position + c1[3];␊ |
| 1233 | ␉}␊ |
| 1234 | ␊ |
| 1235 | ␉transformHSV_RGB(out);␊ |
| 1236 | }␊ |
| 1237 | ␊ |
| 1238 | ␊ |
| 1239 | ␊ |
| 1240 | void transformRGB_HSV(float *components) //H,S,B -> R,G,B␊ |
| 1241 | {␊ |
| 1242 | ␉float H, S, V;␊ |
| 1243 | ␉float R = components[0],␊ |
| 1244 | ␉G = components[1],␊ |
| 1245 | ␉B = components[2];␊ |
| 1246 | ␉␊ |
| 1247 | ␉float MAX = R > G ? (R > B ? R : B) : (G > B ? G : B),␊ |
| 1248 | ␉MIN = R < G ? (R < B ? R : B) : (G < B ? G : B);␊ |
| 1249 | ␉␊ |
| 1250 | ␉if(MAX == MIN)␊ |
| 1251 | ␉␉H = NAN;␊ |
| 1252 | ␉else if(MAX == R)␊ |
| 1253 | ␉␉if(G >= B)␊ |
| 1254 | ␉␉␉H = 60*(G-B)/(MAX-MIN)+0;␊ |
| 1255 | ␉␉else␊ |
| 1256 | ␉␉␉H = 60*(G-B)/(MAX-MIN)+360;␊ |
| 1257 | ␉␉else if(MAX == G)␊ |
| 1258 | ␉␉␉H = 60*(B-R)/(MAX-MIN)+120;␊ |
| 1259 | ␉␉else if(MAX == B)␊ |
| 1260 | ␉␉␉H = 60*(R-G)/(MAX-MIN)+240;␊ |
| 1261 | ␉␊ |
| 1262 | ␉S = MAX == 0 ? 0 : 1 - MIN/MAX;␊ |
| 1263 | ␉V = MAX;␊ |
| 1264 | ␉␊ |
| 1265 | ␉components[0] = H;␊ |
| 1266 | ␉components[1] = S;␊ |
| 1267 | ␉components[2] = V;␊ |
| 1268 | }␊ |
| 1269 | ␊ |
| 1270 | void transformHSV_RGB(float *components) //H,S,B -> R,G,B␊ |
| 1271 | {␊ |
| 1272 | ␉float R, G, B;␊ |
| 1273 | ␉float H = fmodf(components[0],359),␉//map to [0,360)␊ |
| 1274 | ␉S = components[1],␊ |
| 1275 | ␉V = components[2];␊ |
| 1276 | ␉␊ |
| 1277 | ␉int Hi = (int)floorf(H/60.) % 6;␊ |
| 1278 | ␉float f = H/60-Hi,␊ |
| 1279 | ␉p = V*(1-S),␊ |
| 1280 | ␉q = V*(1-f*S),␊ |
| 1281 | ␉t = V*(1-(1-f)*S);␊ |
| 1282 | ␉␊ |
| 1283 | ␉switch (Hi)␊ |
| 1284 | ␉{␊ |
| 1285 | ␉␉case 0:␉R=V;G=t;B=p;␉break;␊ |
| 1286 | ␉␉case 1:␉R=q;G=V;B=p;␉break;␊ |
| 1287 | ␉␉case 2:␉R=p;G=V;B=t;␉break;␊ |
| 1288 | ␉␉case 3:␉R=p;G=q;B=V;␉break;␊ |
| 1289 | ␉␉case 4:␉R=t;G=p;B=V;␉break;␊ |
| 1290 | ␉␉case 5:␉R=V;G=p;B=q;␉break;␊ |
| 1291 | ␉}␊ |
| 1292 | ␉␊ |
| 1293 | ␉components[0] = R;␊ |
| 1294 | ␉components[1] = G;␊ |
| 1295 | ␉components[2] = B;␊ |
| 1296 | }␊ |
| 1297 | ␊ |
| 1298 | void resolveHSV(float *color1, float *color2)␉//H value may be undefined (i.e. graycale color)␊ |
| 1299 | {␉␉␉␉␉␉␉␉␉␉␉//␉we want to fill it with a sensible value␊ |
| 1300 | ␉if(isnan(color1[0]) && isnan(color2[0]))␊ |
| 1301 | ␉␉color1[0] = color2[0] = 0;␊ |
| 1302 | ␉else if(isnan(color1[0]))␊ |
| 1303 | ␉␉color1[0] = color2[0];␊ |
| 1304 | ␉else if(isnan(color2[0]))␊ |
| 1305 | ␉␉color2[0] = color1[0];␊ |
| 1306 | }␊ |
| 1307 | ␊ |
| 1308 | @end |
