| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 | #import "_KAGradient.h" ?? @interface? _KAGradient (PrivateMethods) ?? - ( void )_commonInit; ?? - ( void )setBlendingMode:(KAGradientBlendingMode)mode; - (KAGradientBlendingMode)blendingMode; ?? - ( void )addElement:(KAGradientElement*)newElement; - (KAGradientElement *)elementAtIndex:(unsigned)index; - (KAGradientElement)removeElementAtIndex:(unsigned)index; - (KAGradientElement)removeElementAtPosition:( float )position; ?? @end ?? //C Fucti***** for color blending static void linearEvaluation?? ( void *info, c*****t float *in, float *out); static void chromaticEvaluation( void *info, c*****t float *in, float *out); static void inverseChromaticEvaluation( void *info, c*****t float *in, float *out); static void transformRGB_HSV( float *components); static void transformHSV_RGB( float *components); static void resolveHSV( float *color1, float *color2); ?? @implementation _KAGradient ?? + gradientWithStartingColor: ( NSColor *) startingColor ???????????????? endingColor: ( NSColor *) endingColor { ???? _KAGradient* instance = [[[ self class ] alloc] init]; ?????? ???? KAGradientElement color1; ???? KAGradientElement color2; ?????? ???? [[startingColor colorUsingColorSpaceName: NSCalibratedRGBColorSpace ] getRed: &color1.red? ?????????????????????????????????????????????????????????????????????????? green: &color1.green ??????????????????????????????????????????????????????????????????????????? blue: &color1.blue? ?????????????????????????????????????????????????????????????????????????? alpha: &color1.alpha]; ???? [[endingColor colorUsingColorSpaceName: NSCalibratedRGBColorSpace ] getRed: &color2.red ???????????????????????????????????????????????????????????????????????? green: &color2.green ????????????????????????????????????????????????????????????????????????? blue: &color2.blue ???????????????????????????????????????????????????????????????????????? alpha: &color2.alpha]; ???? color1.position = 0; ???? color2.position = 1; ?????? ???? [instance addElement: &color1]; ???? [instance addElement: &color2]; ?????? ???? return [instance autorelease]; } ?? - ( id ) init { ???? if ( self = [ super init]) ???? { ???????? [ self _commonInit]; ???????? [ self setBlendingMode: KALinearBlendingMode]; ???? } ???? return self ; } ?? - ( id ) initWithStartingColor: ( NSColor *) startingColor ????????????????? endingColor: ( NSColor *) endingColor { ???? self = [ super init]; ?????? ???? if ( self ) ???? { ???????? [ self _commonInit]; ???????? [ self setBlendingMode: KALinearBlendingMode]; ?????????? ???????? KAGradientElement color1; ???????? KAGradientElement color2; ?????????? ???????? [[startingColor colorUsingColorSpaceName: NSCalibratedRGBColorSpace ] getRed: &color1.red? ?????????????????????????????????????????????????????????????????????????????? green: &color1.green ??????????????????????????????????????????????????????????????????????????????? blue: &color1.blue? ?????????????????????????????????????????????????????????????????????????????? alpha: &color1.alpha]; ???????? [[endingColor colorUsingColorSpaceName: NSCalibratedRGBColorSpace ] getRed: &color2.red ???????????????????????????????????????????????????????????????????????????? green: &color2.green ????????????????????????????????????????????????????????????????????????????? blue: &color2.blue ???????????????????????????????????????????????????????????????????????????? alpha: &color2.alpha]; ???????? color1.position = 0; ???????? color2.position = 1; ?????????? ???????? [ self addElement: &color1]; ???????? [ self addElement: &color2]; ???? } ?????? ?????? ???? return self ; } ?? - ( void ) dealloc { ???? CGFunctionRelease(gradientFunction); ?????? ???? KAGradientElement* elementToRemove = elementList; ???? while (elementList != nil ) ???? { ???????? elementToRemove = elementList; ???????? elementList = elementList->nextElement; ???????? free(elementToRemove); ???? } ?????? ???? [ super dealloc]; } ?? - ( id ) copyWithZone: ( NSZone *) zone { ???? _KAGradient * copy = [[[ self class ] allocWithZone: zone] init]; ?????? ???? // now just copy my elementList ???? KAGradientElement* currentElement = elementList; ???? while (currentElement) ???? { ???????? [ copy addElement: currentElement]; ???????? currentElement = currentElement->nextElement; ???? } ?????? ???? [ copy setBlendingMode: blendingMode]; ?????? ???? return copy ; } ?? - ( void )encodeWithCoder:( NSCoder *)coder { ???? if ([coder allowsKeyedCoding]) ???? { ???????? unsigned count = 0; ???????? KAGradientElement *currentElement = elementList; ???????? while(currentElement != nil ) ???????? { ???????????? [coder encodeValueOfObjCType: @encode ( float ) at:&(currentElement->red)]; ???????????? [coder encodeValueOfObjCType: @encode ( float ) at:&(currentElement->green)]; ???????????? [coder encodeValueOfObjCType: @encode ( float ) at:&(currentElement->blue)]; ???????????? [coder encodeValueOfObjCType: @encode ( float ) at:&(currentElement->alpha)]; ???????????? [coder encodeValueOfObjCType: @encode ( float ) at:&(currentElement->position)]; ?????????????? ???????????? count++; ???????????? currentElement = currentElement->nextElement; ???????? } ???????? [coder encodeInt:count forKey:@ "KAGradientElementCount" ]; ???????? [coder encodeInt:blendingMode forKey:@ "KAGradientBlendingMode" ]; ???? } ???? else ???????? [ NSException raise: NSInvalidArchiveOperationException format:@ "Only supports NSKeyedArchiver coders" ]; } ?? - ( id )initWithCoder:( NSCoder *)coder { ???? [ self _commonInit]; ?????? ???? [ self setBlendingMode:[coder decodeIntForKey:@ "KAGradientBlendingMode" ]]; ???? unsigned count = [coder decodeIntForKey:@ "KAGradientElementCount" ]; ?????? ???? while(count != 0) ???? { ???????? KAGradientElement newElement; ?????????? ???????? [coder decodeValueOfObjCType: @encode ( float ) at:&(newElement.red)]; ???????? [coder decodeValueOfObjCType: @encode ( float ) at:&(newElement.green)]; ???????? [coder decodeValueOfObjCType: @encode ( float ) at:&(newElement.blue)]; ???????? [coder decodeValueOfObjCType: @encode ( float ) at:&(newElement.alpha)]; ???????? [coder decodeValueOfObjCType: @encode ( float ) at:&(newElement.position)]; ?????????? ???????? count--; ???????? [ self addElement:&newElement]; ???? } ???? return self ; } #pragma mark - ?? #pragma mark [PrivateMethods] - ( void )_commonInit { ???? elementList = nil ; } ?? - ( void )setBlendingMode:(KAGradientBlendingMode)mode { ???? blendingMode = mode; ?????? ???? //Choose what blending function to use ???? void *evaluationFunction; ???? switch (blendingMode) ???? { ???????? case KALinearBlendingMode: ???????????? evaluationFunction = &linearEvaluation;??????????? break ; ???????? case KAChromaticBlendingMode: ???????????? evaluationFunction = &chromaticEvaluation;??????????? break ; ???????? case KAInverseChromaticBlendingMode: ???????????? evaluationFunction = &inverseChromaticEvaluation;??? break ; ???? } ?????? ???? //replace the current CoreGraphics Function with new one ???? if (gradientFunction != NULL ) ???????? CGFunctionRelease(gradientFunction); ?????? ???? CGFunctionCallbacks evaluationCallbackInfo = {0 , evaluationFunction, NULL };??? //Version, evaluator function, cleanup function ?????? ???? static c*****t float input_value_range?? [2] = { 0, 1 };??????????????????????? //range? for the evaluator input ???? static c*****t float output_value_ranges [8] = { 0, 1, 0, 1, 0, 1, 0, 1 };??????? //ranges for the evaluator output (4 returned values) ?????? ???? gradientFunction = CGFunctionCreate(&elementList,??????????????????? //the two transition colors ???????????????????????????????????????? 1, input_value_range? ,??????? //number of inputs (just fraction of progression) ???????????????????????????????????????? 4, output_value_ranges,??????? //number of outputs (4 - RGBa) ???????????????????????????????????????? &evaluationCallbackInfo);??????? //info for using the evaluator function ?????? } - (KAGradientBlendingMode)blendingMode { ???? return blendingMode; } ?? - ( void )addElement:(KAGradientElement*)newElement { ???? if (elementList == nil || newElement->position < elementList->position) ???? { ???????? // insert at the beginning ???????? KAGradientElement* tmpNext = elementList; ???????? elementList = malloc( sizeof (KAGradientElement)); ???????? *elementList = *newElement; ???????? elementList->nextElement = tmpNext; ???? } ???? else ???? { ???????? KAGradientElement* currentElement = elementList; ???????? while (currentElement->nextElement != nil? ??????????????? && !((currentElement->position <= newElement->position)? ???????????????????? && (newElement->position < currentElement->nextElement->position))) ???????? { ???????????? currentElement = currentElement->nextElement; ???????? } ?????????? ???????? KAGradientElement* tmpNext = currentElement->nextElement; ???????? currentElement->nextElement = malloc( sizeof (KAGradientElement)); ???????? *(currentElement->nextElement) = *newElement; ???????? currentElement->nextElement->nextElement = tmpNext; ???? } } - (KAGradientElement *)elementAtIndex:(unsigned)index { ???? unsigned count = 0; ???? KAGradientElement *currentElement = elementList; ?????? ???? while (currentElement != nil ) ???? { ???????? if (count == index) ???????????? return currentElement; ?????????? ???????? count++; ???????? currentElement = currentElement->nextElement; ???? } ?????? ???? return nil ; } - (KAGradientElement)removeElementAtIndex:(unsigned)index { ???? KAGradientElement removedElement; ?????? ???? if (elementList != nil ) ???? { ???????? if (index == 0) ???????? { ???????????? KAGradientElement *tmpNext = elementList; ???????????? elementList = elementList->nextElement; ?????????????? ???????????? removedElement = *tmpNext; ???????????? free(tmpNext); ?????????????? ???????????? return removedElement; ???????? } ?????????? ???????? unsigned count = 1;??????? //we want to start one ahead ???????? KAGradientElement *currentElement = elementList; ???????? while(currentElement->nextElement != nil ) ???????? { ???????????? if (count == index) ???????????? { ???????????????? KAGradientElement *tmpNext? = currentElement->nextElement; ???????????????? currentElement->nextElement = currentElement->nextElement->nextElement; ?????????????????? ???????????????? removedElement = *tmpNext; ???????????????? free(tmpNext); ?????????????????? ???????????????? return removedElement; ???????????? } ?????????????? ???????????? count++; ???????????? currentElement = currentElement->nextElement; ???????? } ???? } ?????? ???? //element is not found, return empty element ???? removedElement.red?? = 0.0; ???? removedElement.green = 0.0; ???? removedElement.blue? = 0.0; ???? removedElement.alpha = 0.0; ???? removedElement.position = NAN; ???? removedElement.nextElement = nil ; ?????? ???? return removedElement; } - (KAGradientElement)removeElementAtPosition:( float )position { ???? KAGradientElement removedElement; ?????? ???? if (elementList != nil ) ???? { ???????? if (elementList->position == position) ???????? { ???????????? KAGradientElement *tmpNext = elementList; ???????????? elementList = elementList->nextElement; ?????????????? ???????????? removedElement = *tmpNext; ???????????? free(tmpNext); ?????????????? ???????????? return removedElement; ???????? } ???????? else ???????? { ???????????? KAGradientElement *curElement = elementList; ???????????? while(curElement->nextElement != nil ) ???????????? { ???????????????? if (curElement->nextElement->position == position) ???????????????? { ???????????????????? KAGradientElement *tmpNext = curElement->nextElement; ???????????????????? curElement->nextElement = curElement->nextElement->nextElement; ?????????????????????? ???????????????????? removedElement = *tmpNext; ???????????????????? free(tmpNext); ?????????????????????? ???????????????????? return removedElement; ???????????????? } ???????????? } ???????? } ???? } ?????? ???? //element is not found, return empty element ???? removedElement.red?? = 0.0; ???? removedElement.green = 0.0; ???? removedElement.blue? = 0.0; ???? removedElement.alpha = 0.0; ???? removedElement.position = NAN; ???? removedElement.nextElement = nil ; ?????? ???? return removedElement; } ?? #pragma mark [color stop] - ( void ) addColorStop: ( NSColor *) stopColor ??????????? atPosition: (CGFloat) position { ???? if ( nil == stopColor) ???????? [ NSException raise: NSInvalidArgumentException format:@ "The incoming color can't be nil" ]; ???? if (position < 0.0f || position > 1.0f) ???????? [ NSException raise: NSInvalidArgumentException format:@ "Location value should > 0.0f and < 1.0f. It can't be %f" , position]; ?????? ???? KAGradientElement newElement; ?????? ???? // put the components of color into the newElement? ???? //- must make sure it is a RGB color (not gray or CMYK) ???? [[stopColor colorUsingColorSpaceName: NSCalibratedRGBColorSpace ] getRed: &newElement.red ?????????????????????????????????????????????????????????????????????? green: &newElement.green ??????????????????????????????????????????????????????????????????????? blue: &newElement.blue? ?????????????????????????????????????????????????????????????????????? alpha: &newElement.alpha]; ???? newElement.position = position; ???? [ self addElement: &newElement]; } ?? #pragma mark [Draw functi*****] // draw - ( void ) drawFromPoint: ( NSPoint ) startingPoint ??????????????? toPoint: ( NSPoint ) endingPoint { ?????? } - ( void ) drawFromCenter: ( NSPoint ) startingCenter ????????????????? radius: (CGFloat) startRadius ??????????????? toCenter: ( NSPoint ) endCenter ????????????????? radius: (CGFloat) endRadius { ?????? } ?? - ( void ) drawInRect: ( NSRect ) rect? ?????????????? angle: (CGFloat) angle { ???? //First Calculate where the beginning and ending points should be ???? CGPoint startPoint; ???? CGPoint endPoint; ?????? ???? if (angle == 0)??????? //screw the calculati***** - we know the answer ?????? { ???????? startPoint = CGPointMake( NSMinX (rect), NSMinY (rect));??? //right of rect ???????? endPoint?? = CGPointMake( NSMaxX (rect), NSMinY (rect));??? //left? of rect ?????? } ???? else if (angle == 90)??? //same as above ?????? { ???????? startPoint = CGPointMake( NSMinX (rect), NSMinY (rect));??? //bottom of rect ???????? endPoint?? = CGPointMake( NSMinX (rect), NSMaxY (rect));??? //top??? of rect ?????? } ???? else??????????????????????? //ok, we'll do the calculati***** now? ?????? { ???????? float x,y; ???????? float sina, cosa, tana; ?????????? ???????? float length; ???????? float deltax, ???????? deltay; ?????????? ???????? float rangle = angle * pi/180;??? //convert the angle to radians ?????????? ???????? if (fabsf(tan(rangle))<=1)??? //for range [-45,45], [135,225] ???????? { ???????????? x = NSWidth (rect); ???????????? y = NSHeight (rect); ?????????????? ???????????? sina = sin(rangle); ???????????? cosa = cos(rangle); ???????????? tana = tan(rangle); ?????????????? ???????????? length = x/fabsf(cosa)+(y-x*fabsf(tana))*fabsf(sina); ?????????????? ???????????? deltax = length*cosa/2; ???????????? deltay = length*sina/2; ???????? } ???????? else??????????????????????? //for range [45,135], [225,315] ???????? { ???????????? x = NSHeight (rect); ???????????? y = NSWidth (rect); ?????????????? ???????????? sina = sin(rangle - 90*pi/180); ???????????? cosa = cos(rangle - 90*pi/180); ???????????? tana = tan(rangle - 90*pi/180); ?????????????? ???????????? length = x/fabsf(cosa)+(y-x*fabsf(tana))*fabsf(sina); ?????????????? ???????????? deltax =-length*sina/2; ???????????? deltay = length*cosa/2; ???????? } ?????????? ???????? startPoint = CGPointMake( NSMidX (rect)-deltax, NSMidY (rect)-deltay); ???????? endPoint?? = CGPointMake( NSMidX (rect)+deltax, NSMidY (rect)+deltay); ???? } ?????? ???? //Calls to CoreGraphics ???? CGContextRef currentContext = (CGContextRef)[[ NSGraphicsContext currentContext] graphicsPort]; ???? CGContextSaveGState(currentContext); #if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4 ???? CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); #else ???? CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); #endif ???? CGShadingRef myCGShading = CGShadingCreateAxial(colorspace, startPoint, endPoint, gradientFunction, false , false ); ?????? ???? CGContextClipToRect (currentContext, *(CGRect *)&rect);??? //This is where the action happens ???? CGContextDrawShading(currentContext, myCGShading); ?????? ???? CGShadingRelease(myCGShading); ???? CGColorSpaceRelease(colorspace ); ???? CGContextRestoreGState(currentContext); } - ( void ) drawInBezierPath: ( NSBezierPath *) path? ???????????????????? angle: (CGFloat) angle { ???? NSGraphicsContext *currentContext = [ NSGraphicsContext currentContext]; ???? [currentContext saveGraphicsState]; ???? NSAffineTransform *transform = [[ NSAffineTransform alloc] init]; ?????? ???? [transform rotateByDegrees:-angle]; ???? [path transformUsingAffineTransform:transform]; ???? [transform invert]; ???? [transform concat]; ?????? ???? [path addClip]; ???? [ self drawInRect:[path bounds] angle:0]; ???? [path transformUsingAffineTransform:transform]; ???? [transform release]; ???? [currentContext restoreGraphicsState]; } ?? - ( void ) drawRadialInRect: ( NSRect ) rect { ???? CGPoint startPoint, endPoint; ???? float startRadius, endRadius; ???? float scalex, scaley, transx, transy; ?????? ???? startPoint = endPoint = CGPointMake( NSMidX (rect), NSMidY (rect)); ?????? ???? startRadius = -1; ???? if ( NSHeight (rect)> NSWidth (rect)) ???? { ???????? scalex = NSWidth (rect)/ NSHeight (rect); ???????? transx = rect.origin.x + ( NSHeight (rect)- NSWidth (rect))/2; ???????? scaley = 1; ???????? transy = 1; ???????? endRadius = NSHeight (rect)/2; ???? } ???? else ???? { ???????? scalex = 1; ???????? transx = 1; ???????? scaley = NSHeight (rect)/ NSWidth (rect); ???????? transy = rect.origin.y + ( NSWidth (rect)- NSHeight (rect))/2; ???????? endRadius = NSWidth (rect)/2; ???? } ?????? ???? //Calls to CoreGraphics ???? CGContextRef currentContext = (CGContextRef)[[ NSGraphicsContext currentContext] graphicsPort]; ???? CGContextSaveGState(currentContext); #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4 ???? CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); #else ???? CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); #endif ???? CGShadingRef myCGShading = CGShadingCreateRadial(colorspace, startPoint, startRadius, endPoint, endRadius, gradientFunction, true , true ); ?????? ???? CGContextClipToRect? (currentContext, *(CGRect *)&rect); ???? CGContextScaleCTM??? (currentContext, scalex, scaley); ???? CGContextTranslateCTM(currentContext, transx, transy); ???? CGContextDrawShading (currentContext, myCGShading);??????? //This is where the action happens ?????? ???? CGShadingRelease(myCGShading); ???? CGColorSpaceRelease(colorspace); ???? CGContextRestoreGState(currentContext); } - ( void ) drawRadialInBezierPath: ( NSBezierPath *) path { ???? NSGraphicsContext *currentContext = [ NSGraphicsContext currentContext]; ???? [currentContext saveGraphicsState]; ???? [path addClip]; ???? [ self drawRadialInRect:[path bounds]]; ???? [currentContext restoreGraphicsState]; } #pragma mark - ?? #pragma mark Core Graphics //Blending Functi*****/ void linearEvaluation ( void *info, c*****t float *in, float *out) { ???? float position = *in; ?????? ???? if (*(KAGradientElement **)info == nil )??? //if elementList is empty return clear color ???? { ???????? out[0] = out[1] = out[2] = out[3] = 1; ???????? return ; ???? } ?????? ???? //This grabs the first two colors in the sequence ???? KAGradientElement *color1 = *(KAGradientElement **)info; ???? KAGradientElement *color2 = color1->nextElement; ?????? ???? //make sure first color and second color are on other sides of position ???? while(color2 != nil && color2->position < position) ?????? { ???????? color1 = color2; ???????? color2 = color1->nextElement; ?????? } ???? //if we don't have another color then make next color the same color ???? if (color2 == nil ) ???? { ???????? color2 = color1; ???? } ?????? ???? //----------FailSafe settings---------- ???? //color1->red?? = 1; color2->red?? = 0; ???? //color1->green = 1; color2->green = 0; ???? //color1->blue? = 1; color2->blue? = 0; ???? //color1->alpha = 1; color2->alpha = 1; ???? //color1->position = .5; ???? //color2->position = .5; ???? //------------------------------------- ?????? ???? if (position <= color1->position)??????????? //Make all below color color1's position equal to color1 ?????? { ???????? out[0] = color1->red;? ???????? out[1] = color1->green; ???????? out[2] = color1->blue; ???????? out[3] = color1->alpha; ?????? } ???? else if (position >= color2->position)??? //Make all above color color2's position equal to color2 ?????? { ???????? out[0] = color2->red;? ???????? out[1] = color2->green; ???????? out[2] = color2->blue; ???????? out[3] = color2->alpha; ?????? } ???? else??????????????????????????????????????? //Interpolate color at posti***** between color1 and color1 ?????? { ???????? //adjust position so that it goes from 0 to 1 in the range from color 1 & 2's position? ???????? position = (position-color1->position)/(color2->position - color1->position); ?????????? ???????? out[0] = (color2->red?? - color1->red? )*position + color1->red;? ???????? out[1] = (color2->green - color1->green)*position + color1->green; ???????? out[2] = (color2->blue? - color1->blue )*position + color1->blue; ???????? out[3] = (color2->alpha - color1->alpha)*position + color1->alpha; ???? } ?????? ???? //Premultiply the color by the alpha. ???? out[0] *= out[3]; ???? out[1] *= out[3]; ???? out[2] *= out[3]; } ?? //Chromatic Evaluation -? //??? This blends colors by their Hue, Saturation, and Value(Brightness) right now I just? //??? transform the RGB values stored in the KAGradientElements to HSB, in the future I may //??? streamline it to avoid transforming in and out of HSB colorspace *for later* // //??? For the chromatic blend we shift the hue of color1 to meet the hue of color2. To do //??? this we will add to the hue's angle (if we subtract we'll be doing the inverse //??? chromatic...scroll down more for that). All we need to do is keep adding to the hue //? until we wrap around the colorwheel and get to color2. void chromaticEvaluation( void *info, c*****t float *in, float *out) { ???? float position = *in; ?????? ???? if (*(KAGradientElement **)info == nil )??? //if elementList is empty return clear color ???? { ???????? out[0] = out[1] = out[2] = out[3] = 1; ???????? return ; ???? } ?????? ???? //This grabs the first two colors in the sequence ???? KAGradientElement *color1 = *(KAGradientElement **)info; ???? KAGradientElement *color2 = color1->nextElement; ?????? ???? float c1[4]; ???? float c2[4]; ?????? ???? //make sure first color and second color are on other sides of position ???? while(color2 != nil && color2->position < position) ?????? { ???????? color1 = color2; ???????? color2 = color1->nextElement; ?????? } ???? //if we don't have another color then make next color the same color ???? if (color2 == nil ) ???? { ???????? color2 = color1; ???? } ?????? ?????? ???? c1[0] = color1->red;? ???? c1[1] = color1->green; ???? c1[2] = color1->blue; ???? c1[3] = color1->alpha; ?????? ???? c2[0] = color2->red;? ???? c2[1] = color2->green; ???? c2[2] = color2->blue; ???? c2[3] = color2->alpha; ?????? ???? transformRGB_HSV(c1); ???? transformRGB_HSV(c2); ???? resolveHSV(c1,c2); ?????? ???? if (c1[0] > c2[0]) //if color1's hue is higher than color2's hue then? ???????? c2[0] += 360;??? //??? we need to move c2 one revolution around the wheel ?????? ?????? ???? if (position <= color1->position)??????????? //Make all below color color1's position equal to color1 ?????? { ???????? out[0] = c1[0];? ???????? out[1] = c1[1]; ???????? out[2] = c1[2]; ???????? out[3] = c1[3]; ?????? } ???? else if (position >= color2->position)??? //Make all above color color2's position equal to color2 ?????? { ???????? out[0] = c2[0];? ???????? out[1] = c2[1]; ???????? out[2] = c2[2]; ???????? out[3] = c2[3]; ?????? } ???? else??????????????????????????????????????? //Interpolate color at posti***** between color1 and color1 ?????? { ???????? //adjust position so that it goes from 0 to 1 in the range from color 1 & 2's position? ???????? position = (position-color1->position)/(color2->position - color1->position); ?????????? ???????? out[0] = (c2[0] - c1[0])*position + c1[0];? ???????? out[1] = (c2[1] - c1[1])*position + c1[1]; ???????? out[2] = (c2[2] - c1[2])*position + c1[2]; ???????? out[3] = (c2[3] - c1[3])*position + c1[3]; ?????? } ?????? ???? transformHSV_RGB(out); ?????? ???? //Premultiply the color by the alpha. ???? out[0] *= out[3]; ???? out[1] *= out[3]; ???? out[2] *= out[3]; } ?? //Inverse Chromatic Evaluation -? //??? Inverse Chromatic is about the same story as Chromatic Blend, but here the Hue //??? is strictly decreasing, that is we need to get from color1 to color2 by decreasing //??? the 'angle' (i.e. 90o -> 180o would be done by subtracting 270o and getting -180o... //??? which is equivalent to 180o mod 360o void inverseChromaticEvaluation( void *info, c*****t float *in, float *out) { ???? float position = *in; ?????? ???? if (*(KAGradientElement **)info == nil )??? //if elementList is empty return clear color ???? { ???????? out[0] = out[1] = out[2] = out[3] = 1; ???????? return ; ???? } ?????? ???? //This grabs the first two colors in the sequence ???? KAGradientElement *color1 = *(KAGradientElement **)info; ???? KAGradientElement *color2 = color1->nextElement; ?????? ???? float c1[4]; ???? float c2[4]; ?????? ???? //make sure first color and second color are on other sides of position ???? while(color2 != nil && color2->position < position) ?????? { ???????? color1 = color2; ???????? color2 = color1->nextElement; ?????? } ???? //if we don't have another color then make next color the same color ???? if (color2 == nil ) ???? { ???????? color2 = color1; ???? } ?????? ???? c1[0] = color1->red;? ???? c1[1] = color1->green; ???? c1[2] = color1->blue; ???? c1[3] = color1->alpha; ?????? ???? c2[0] = color2->red;? ???? c2[1] = color2->green; ???? c2[2] = color2->blue; ???? c2[3] = color2->alpha; ?????? ???? transformRGB_HSV(c1); ???? transformRGB_HSV(c2); ???? resolveHSV(c1,c2); ?????? ???? if (c1[0] < c2[0]) //if color1's hue is higher than color2's hue then? ???????? c1[0] += 360;??? //??? we need to move c2 one revolution back on the wheel ?????? ?????? ???? if (position <= color1->position)??????????? //Make all below color color1's position equal to color1 ?????? { ???????? out[0] = c1[0];? ???????? out[1] = c1[1]; ???????? out[2] = c1[2]; ???????? out[3] = c1[3]; ?????? } ???? else if (position >= color2->position)??? //Make all above color color2's position equal to color2 ?????? { ???????? out[0] = c2[0];? ???????? out[1] = c2[1]; ???????? out[2] = c2[2]; ???????? out[3] = c2[3]; ?????? } ???? else??????????????????????????????????????? //Interpolate color at posti***** between color1 and color1 ?????? { ???????? //adjust position so that it goes from 0 to 1 in the range from color 1 & 2's position? ???????? position = (position-color1->position)/(color2->position - color1->position); ?????????? ???????? out[0] = (c2[0] - c1[0])*position + c1[0];? ???????? out[1] = (c2[1] - c1[1])*position + c1[1]; ???????? out[2] = (c2[2] - c1[2])*position + c1[2]; ???????? out[3] = (c2[3] - c1[3])*position + c1[3]; ?????? } ?????? ???? transformHSV_RGB(out); ?????? ???? //Premultiply the color by the alpha. ???? out[0] *= out[3]; ???? out[1] *= out[3]; ???? out[2] *= out[3]; } ?? ?? void transformRGB_HSV( float *components) //H,S,B -> R,G,B { ???? float H, S, V; ???? float R = components[0], ???? G = components[1], ???? B = components[2]; ?????? ???? float MAX = R > G ? (R > B ? R : B) : (G > B ? G : B), ???? MIN = R < G ? (R < B ? R : B) : (G < B ? G : B); ?????? ???? if (MAX == MIN) ???????? H = NAN; ???? else if (MAX == R) ???????? if (G >= B) ???????????? H = 60*(G-B)/(MAX-MIN)+0; ???????? else ???????????? H = 60*(G-B)/(MAX-MIN)+360; ???????? else if (MAX == G) ???????????? H = 60*(B-R)/(MAX-MIN)+120; ???????? else if (MAX == B) ???????????? H = 60*(R-G)/(MAX-MIN)+240; ?????? ???? S = MAX == 0 ? 0 : 1 - MIN/MAX; ???? V = MAX; ?????? ???? components[0] = H; ???? components[1] = S; ???? components[2] = V; } ?? void transformHSV_RGB( float *components) //H,S,B -> R,G,B { ???? float R, G, B; ???? float H = fmodf(components[0],359),??? //map to [0,360) ???? S = components[1], ???? V = components[2]; ?????? ???? int?? Hi = ( int )floorf(H/60.) % 6; ???? float f? = H/60-Hi, ???? p? = V*(1-S), ???? q? = V*(1-f*S), ???? t? = V*(1-(1-f)*S); ?????? ???? switch (Hi) ???? { ???????? case 0:??? R=V;G=t;B=p;??? break ; ???????? case 1:??? R=q;G=V;B=p;??? break ; ???????? case 2:??? R=p;G=V;B=t;??? break ; ???????? case 3:??? R=p;G=q;B=V;??? break ; ???????? case 4:??? R=t;G=p;B=V;??? break ; ???????? case 5:??? R=V;G=p;B=q;??? break ; ???? } ?????? ???? components[0] = R; ???? components[1] = G; ???? components[2] = B; } ?? void resolveHSV( float *color1, float *color2)??? //H value may be undefined (i.e. graycale color) {??????????????????????????????????????????? //??? we want to fill it with a sensible value ???? if (isnan(color1[0]) && isnan(color2[0])) ???????? color1[0] = color2[0] = 0; ???? else if (isnan(color1[0])) ???????? color1[0] = color2[0]; ???? else if (isnan(color2[0])) ???????? color2[0] = color1[0]; } |
