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Source: /jpgraph_rgb.inc.php - 615 lines - 26937 bytes - Summary - Text - Print

   1  <?php
   2  //=======================================================================
   3  // File:        JPGRAPH_RGB.INC.PHP
   4  // Description: Class to handle RGb color space specification and
   5  //              named colors
   6  // Created:     2001-01-08 (Refactored to separate file 2008-08-01)
   7  // Ver:         $Id: jpgraph_rgb.inc.php 1893 2009-10-02 23:15:25Z ljp $
   8  //
   9  // Copyright (c) Asial Corporation. All rights reserved.
  10  //========================================================================
  11  
  12  
  13  /*===================================================
  14  // CLASS RGB
  15  // Description: Color definitions as RGB triples
  16  //===================================================
  17  */
  18  
  19  class RGB {
  20      public $rgb_table;
  21      public $img;
  22  
  23      function __construct($aImg=null) {
  24          $this->img = $aImg;
  25  
  26          // Conversion array between color names and RGB
  27          $this->rgb_table = array(
  28              'aqua'=> array(0,255,255),
  29              'lime'=> array(0,255,0),
  30              'teal'=> array(0,128,128),
  31              'whitesmoke'=>array(245,245,245),
  32              'gainsboro'=>array(220,220,220),
  33              'oldlace'=>array(253,245,230),
  34              'linen'=>array(250,240,230),
  35              'antiquewhite'=>array(250,235,215),
  36              'papayawhip'=>array(255,239,213),
  37              'blanchedalmond'=>array(255,235,205),
  38              'bisque'=>array(255,228,196),
  39              'peachpuff'=>array(255,218,185),
  40              'navajowhite'=>array(255,222,173),
  41              'moccasin'=>array(255,228,181),
  42              'cornsilk'=>array(255,248,220),
  43              'ivory'=>array(255,255,240),
  44              'lemonchiffon'=>array(255,250,205),
  45              'seashell'=>array(255,245,238),
  46              'mintcream'=>array(245,255,250),
  47              'azure'=>array(240,255,255),
  48              'aliceblue'=>array(240,248,255),
  49              'lavender'=>array(230,230,250),
  50              'lavenderblush'=>array(255,240,245),
  51              'mistyrose'=>array(255,228,225),
  52              'white'=>array(255,255,255),
  53              'black'=>array(0,0,0),
  54              'darkslategray'=>array(47,79,79),
  55              'dimgray'=>array(105,105,105),
  56              'slategray'=>array(112,128,144),
  57              'lightslategray'=>array(119,136,153),
  58              'gray'=>array(190,190,190),
  59              'lightgray'=>array(211,211,211),
  60              'midnightblue'=>array(25,25,112),
  61              'navy'=>array(0,0,128),
  62              'indigo'=>array(75,0,130),
  63              'electricindigo'=>array(102,0,255),
  64              'deepindigo'=>array(138,43,226),
  65              'pigmentindigo'=>array(75,0,130),
  66              'indigodye'=>array(0,65,106),
  67              'cornflowerblue'=>array(100,149,237),
  68              'darkslateblue'=>array(72,61,139),
  69              'slateblue'=>array(106,90,205),
  70              'mediumslateblue'=>array(123,104,238),
  71              'lightslateblue'=>array(132,112,255),
  72              'mediumblue'=>array(0,0,205),
  73              'royalblue'=>array(65,105,225),
  74              'blue'=>array(0,0,255),
  75              'dodgerblue'=>array(30,144,255),
  76              'deepskyblue'=>array(0,191,255),
  77              'skyblue'=>array(135,206,235),
  78              'lightskyblue'=>array(135,206,250),
  79              'steelblue'=>array(70,130,180),
  80              'lightred'=>array(211,167,168),
  81              'lightsteelblue'=>array(176,196,222),
  82              'lightblue'=>array(173,216,230),
  83              'powderblue'=>array(176,224,230),
  84              'paleturquoise'=>array(175,238,238),
  85              'darkturquoise'=>array(0,206,209),
  86              'mediumturquoise'=>array(72,209,204),
  87              'turquoise'=>array(64,224,208),
  88              'cyan'=>array(0,255,255),
  89              'lightcyan'=>array(224,255,255),
  90              'cadetblue'=>array(95,158,160),
  91              'mediumaquamarine'=>array(102,205,170),
  92              'aquamarine'=>array(127,255,212),
  93              'darkgreen'=>array(0,100,0),
  94              'darkolivegreen'=>array(85,107,47),
  95              'darkseagreen'=>array(143,188,143),
  96              'seagreen'=>array(46,139,87),
  97              'mediumseagreen'=>array(60,179,113),
  98              'lightseagreen'=>array(32,178,170),
  99              'palegreen'=>array(152,251,152),
 100              'springgreen'=>array(0,255,127),
 101              'lawngreen'=>array(124,252,0),
 102              'green'=>array(0,255,0),
 103              'chartreuse'=>array(127,255,0),
 104              'mediumspringgreen'=>array(0,250,154),
 105              'greenyellow'=>array(173,255,47),
 106              'limegreen'=>array(50,205,50),
 107              'yellowgreen'=>array(154,205,50),
 108              'forestgreen'=>array(34,139,34),
 109              'olivedrab'=>array(107,142,35),
 110              'darkkhaki'=>array(189,183,107),
 111              'khaki'=>array(240,230,140),
 112              'palegoldenrod'=>array(238,232,170),
 113              'lightgoldenrodyellow'=>array(250,250,210),
 114              'lightyellow'=>array(255,255,200),
 115              'yellow'=>array(255,255,0),
 116              'gold'=>array(255,215,0),
 117              'lightgoldenrod'=>array(238,221,130),
 118              'goldenrod'=>array(218,165,32),
 119              'darkgoldenrod'=>array(184,134,11),
 120              'rosybrown'=>array(188,143,143),
 121              'indianred'=>array(205,92,92),
 122              'saddlebrown'=>array(139,69,19),
 123              'sienna'=>array(160,82,45),
 124              'peru'=>array(205,133,63),
 125              'burlywood'=>array(222,184,135),
 126              'beige'=>array(245,245,220),
 127              'wheat'=>array(245,222,179),
 128              'sandybrown'=>array(244,164,96),
 129              'tan'=>array(210,180,140),
 130              'chocolate'=>array(210,105,30),
 131              'firebrick'=>array(178,34,34),
 132              'brown'=>array(165,42,42),
 133              'darksalmon'=>array(233,150,122),
 134              'salmon'=>array(250,128,114),
 135              'lightsalmon'=>array(255,160,122),
 136              'orange'=>array(255,165,0),
 137              'darkorange'=>array(255,140,0),
 138              'coral'=>array(255,127,80),
 139              'lightcoral'=>array(240,128,128),
 140              'tomato'=>array(255,99,71),
 141              'orangered'=>array(255,69,0),
 142              'red'=>array(255,0,0),
 143              'hotpink'=>array(255,105,180),
 144              'deeppink'=>array(255,20,147),
 145              'pink'=>array(255,192,203),
 146              'lightpink'=>array(255,182,193),
 147              'palevioletred'=>array(219,112,147),
 148              'maroon'=>array(176,48,96),
 149              'mediumvioletred'=>array(199,21,133),
 150              'violetred'=>array(208,32,144),
 151              'magenta'=>array(255,0,255),
 152              'violet'=>array(238,130,238),
 153              'plum'=>array(221,160,221),
 154              'orchid'=>array(218,112,214),
 155              'mediumorchid'=>array(186,85,211),
 156              'darkorchid'=>array(153,50,204),
 157              'darkviolet'=>array(148,0,211),
 158              'blueviolet'=>array(138,43,226),
 159              'purple'=>array(160,32,240),
 160              'mediumpurple'=>array(147,112,219),
 161              'thistle'=>array(216,191,216),
 162              'snow1'=>array(255,250,250),
 163              'snow2'=>array(238,233,233),
 164              'snow3'=>array(205,201,201),
 165              'snow4'=>array(139,137,137),
 166              'seashell1'=>array(255,245,238),
 167              'seashell2'=>array(238,229,222),
 168              'seashell3'=>array(205,197,191),
 169              'seashell4'=>array(139,134,130),
 170              'AntiqueWhite1'=>array(255,239,219),
 171              'AntiqueWhite2'=>array(238,223,204),
 172              'AntiqueWhite3'=>array(205,192,176),
 173              'AntiqueWhite4'=>array(139,131,120),
 174              'bisque1'=>array(255,228,196),
 175              'bisque2'=>array(238,213,183),
 176              'bisque3'=>array(205,183,158),
 177              'bisque4'=>array(139,125,107),
 178              'peachPuff1'=>array(255,218,185),
 179              'peachpuff2'=>array(238,203,173),
 180              'peachpuff3'=>array(205,175,149),
 181              'peachpuff4'=>array(139,119,101),
 182              'navajowhite1'=>array(255,222,173),
 183              'navajowhite2'=>array(238,207,161),
 184              'navajowhite3'=>array(205,179,139),
 185              'navajowhite4'=>array(139,121,94),
 186              'lemonchiffon1'=>array(255,250,205),
 187              'lemonchiffon2'=>array(238,233,191),
 188              'lemonchiffon3'=>array(205,201,165),
 189              'lemonchiffon4'=>array(139,137,112),
 190              'ivory1'=>array(255,255,240),
 191              'ivory2'=>array(238,238,224),
 192              'ivory3'=>array(205,205,193),
 193              'ivory4'=>array(139,139,131),
 194              'honeydew'=>array(193,205,193),
 195              'lavenderblush1'=>array(255,240,245),
 196              'lavenderblush2'=>array(238,224,229),
 197              'lavenderblush3'=>array(205,193,197),
 198              'lavenderblush4'=>array(139,131,134),
 199              'mistyrose1'=>array(255,228,225),
 200              'mistyrose2'=>array(238,213,210),
 201              'mistyrose3'=>array(205,183,181),
 202              'mistyrose4'=>array(139,125,123),
 203              'azure1'=>array(240,255,255),
 204              'azure2'=>array(224,238,238),
 205              'azure3'=>array(193,205,205),
 206              'azure4'=>array(131,139,139),
 207              'slateblue1'=>array(131,111,255),
 208              'slateblue2'=>array(122,103,238),
 209              'slateblue3'=>array(105,89,205),
 210              'slateblue4'=>array(71,60,139),
 211              'royalblue1'=>array(72,118,255),
 212              'royalblue2'=>array(67,110,238),
 213              'royalblue3'=>array(58,95,205),
 214              'royalblue4'=>array(39,64,139),
 215              'dodgerblue1'=>array(30,144,255),
 216              'dodgerblue2'=>array(28,134,238),
 217              'dodgerblue3'=>array(24,116,205),
 218              'dodgerblue4'=>array(16,78,139),
 219              'steelblue1'=>array(99,184,255),
 220              'steelblue2'=>array(92,172,238),
 221              'steelblue3'=>array(79,148,205),
 222              'steelblue4'=>array(54,100,139),
 223              'deepskyblue1'=>array(0,191,255),
 224              'deepskyblue2'=>array(0,178,238),
 225              'deepskyblue3'=>array(0,154,205),
 226              'deepskyblue4'=>array(0,104,139),
 227              'skyblue1'=>array(135,206,255),
 228              'skyblue2'=>array(126,192,238),
 229              'skyblue3'=>array(108,166,205),
 230              'skyblue4'=>array(74,112,139),
 231              'lightskyblue1'=>array(176,226,255),
 232              'lightskyblue2'=>array(164,211,238),
 233              'lightskyblue3'=>array(141,182,205),
 234              'lightskyblue4'=>array(96,123,139),
 235              'slategray1'=>array(198,226,255),
 236              'slategray2'=>array(185,211,238),
 237              'slategray3'=>array(159,182,205),
 238              'slategray4'=>array(108,123,139),
 239              'lightsteelblue1'=>array(202,225,255),
 240              'lightsteelblue2'=>array(188,210,238),
 241              'lightsteelblue3'=>array(162,181,205),
 242              'lightsteelblue4'=>array(110,123,139),
 243              'lightblue1'=>array(191,239,255),
 244              'lightblue2'=>array(178,223,238),
 245              'lightblue3'=>array(154,192,205),
 246              'lightblue4'=>array(104,131,139),
 247              'lightcyan1'=>array(224,255,255),
 248              'lightcyan2'=>array(209,238,238),
 249              'lightcyan3'=>array(180,205,205),
 250              'lightcyan4'=>array(122,139,139),
 251              'paleturquoise1'=>array(187,255,255),
 252              'paleturquoise2'=>array(174,238,238),
 253              'paleturquoise3'=>array(150,205,205),
 254              'paleturquoise4'=>array(102,139,139),
 255              'cadetblue1'=>array(152,245,255),
 256              'cadetblue2'=>array(142,229,238),
 257              'cadetblue3'=>array(122,197,205),
 258              'cadetblue4'=>array(83,134,139),
 259              'turquoise1'=>array(0,245,255),
 260              'turquoise2'=>array(0,229,238),
 261              'turquoise3'=>array(0,197,205),
 262              'turquoise4'=>array(0,134,139),
 263              'cyan1'=>array(0,255,255),
 264              'cyan2'=>array(0,238,238),
 265              'cyan3'=>array(0,205,205),
 266              'cyan4'=>array(0,139,139),
 267              'darkslategray1'=>array(151,255,255),
 268              'darkslategray2'=>array(141,238,238),
 269              'darkslategray3'=>array(121,205,205),
 270              'darkslategray4'=>array(82,139,139),
 271              'aquamarine1'=>array(127,255,212),
 272              'aquamarine2'=>array(118,238,198),
 273              'aquamarine3'=>array(102,205,170),
 274              'aquamarine4'=>array(69,139,116),
 275              'darkseagreen1'=>array(193,255,193),
 276              'darkseagreen2'=>array(180,238,180),
 277              'darkseagreen3'=>array(155,205,155),
 278              'darkseagreen4'=>array(105,139,105),
 279              'seagreen1'=>array(84,255,159),
 280              'seagreen2'=>array(78,238,148),
 281              'seagreen3'=>array(67,205,128),
 282              'seagreen4'=>array(46,139,87),
 283              'palegreen1'=>array(154,255,154),
 284              'palegreen2'=>array(144,238,144),
 285              'palegreen3'=>array(124,205,124),
 286              'palegreen4'=>array(84,139,84),
 287              'springgreen1'=>array(0,255,127),
 288              'springgreen2'=>array(0,238,118),
 289              'springgreen3'=>array(0,205,102),
 290              'springgreen4'=>array(0,139,69),
 291              'chartreuse1'=>array(127,255,0),
 292              'chartreuse2'=>array(118,238,0),
 293              'chartreuse3'=>array(102,205,0),
 294              'chartreuse4'=>array(69,139,0),
 295              'olivedrab1'=>array(192,255,62),
 296              'olivedrab2'=>array(179,238,58),
 297              'olivedrab3'=>array(154,205,50),
 298              'olivedrab4'=>array(105,139,34),
 299              'darkolivegreen1'=>array(202,255,112),
 300              'darkolivegreen2'=>array(188,238,104),
 301              'darkolivegreen3'=>array(162,205,90),
 302              'darkolivegreen4'=>array(110,139,61),
 303              'khaki1'=>array(255,246,143),
 304              'khaki2'=>array(238,230,133),
 305              'khaki3'=>array(205,198,115),
 306              'khaki4'=>array(139,134,78),
 307              'lightgoldenrod1'=>array(255,236,139),
 308              'lightgoldenrod2'=>array(238,220,130),
 309              'lightgoldenrod3'=>array(205,190,112),
 310              'lightgoldenrod4'=>array(139,129,76),
 311              'yellow1'=>array(255,255,0),
 312              'yellow2'=>array(238,238,0),
 313              'yellow3'=>array(205,205,0),
 314              'yellow4'=>array(139,139,0),
 315              'gold1'=>array(255,215,0),
 316              'gold2'=>array(238,201,0),
 317              'gold3'=>array(205,173,0),
 318              'gold4'=>array(139,117,0),
 319              'goldenrod1'=>array(255,193,37),
 320              'goldenrod2'=>array(238,180,34),
 321              'goldenrod3'=>array(205,155,29),
 322              'goldenrod4'=>array(139,105,20),
 323              'darkgoldenrod1'=>array(255,185,15),
 324              'darkgoldenrod2'=>array(238,173,14),
 325              'darkgoldenrod3'=>array(205,149,12),
 326              'darkgoldenrod4'=>array(139,101,8),
 327              'rosybrown1'=>array(255,193,193),
 328              'rosybrown2'=>array(238,180,180),
 329              'rosybrown3'=>array(205,155,155),
 330              'rosybrown4'=>array(139,105,105),
 331              'indianred1'=>array(255,106,106),
 332              'indianred2'=>array(238,99,99),
 333              'indianred3'=>array(205,85,85),
 334              'indianred4'=>array(139,58,58),
 335              'sienna1'=>array(255,130,71),
 336              'sienna2'=>array(238,121,66),
 337              'sienna3'=>array(205,104,57),
 338              'sienna4'=>array(139,71,38),
 339              'burlywood1'=>array(255,211,155),
 340              'burlywood2'=>array(238,197,145),
 341              'burlywood3'=>array(205,170,125),
 342              'burlywood4'=>array(139,115,85),
 343              'wheat1'=>array(255,231,186),
 344              'wheat2'=>array(238,216,174),
 345              'wheat3'=>array(205,186,150),
 346              'wheat4'=>array(139,126,102),
 347              'tan1'=>array(255,165,79),
 348              'tan2'=>array(238,154,73),
 349              'tan3'=>array(205,133,63),
 350              'tan4'=>array(139,90,43),
 351              'chocolate1'=>array(255,127,36),
 352              'chocolate2'=>array(238,118,33),
 353              'chocolate3'=>array(205,102,29),
 354              'chocolate4'=>array(139,69,19),
 355              'firebrick1'=>array(255,48,48),
 356              'firebrick2'=>array(238,44,44),
 357              'firebrick3'=>array(205,38,38),
 358              'firebrick4'=>array(139,26,26),
 359              'brown1'=>array(255,64,64),
 360              'brown2'=>array(238,59,59),
 361              'brown3'=>array(205,51,51),
 362              'brown4'=>array(139,35,35),
 363              'salmon1'=>array(255,140,105),
 364              'salmon2'=>array(238,130,98),
 365              'salmon3'=>array(205,112,84),
 366              'salmon4'=>array(139,76,57),
 367              'lightsalmon1'=>array(255,160,122),
 368              'lightsalmon2'=>array(238,149,114),
 369              'lightsalmon3'=>array(205,129,98),
 370              'lightsalmon4'=>array(139,87,66),
 371              'orange1'=>array(255,165,0),
 372              'orange2'=>array(238,154,0),
 373              'orange3'=>array(205,133,0),
 374              'orange4'=>array(139,90,0),
 375              'darkorange1'=>array(255,127,0),
 376              'darkorange2'=>array(238,118,0),
 377              'darkorange3'=>array(205,102,0),
 378              'darkorange4'=>array(139,69,0),
 379              'coral1'=>array(255,114,86),
 380              'coral2'=>array(238,106,80),
 381              'coral3'=>array(205,91,69),
 382              'coral4'=>array(139,62,47),
 383              'tomato1'=>array(255,99,71),
 384              'tomato2'=>array(238,92,66),
 385              'tomato3'=>array(205,79,57),
 386              'tomato4'=>array(139,54,38),
 387              'orangered1'=>array(255,69,0),
 388              'orangered2'=>array(238,64,0),
 389              'orangered3'=>array(205,55,0),
 390              'orangered4'=>array(139,37,0),
 391              'deeppink1'=>array(255,20,147),
 392              'deeppink2'=>array(238,18,137),
 393              'deeppink3'=>array(205,16,118),
 394              'deeppink4'=>array(139,10,80),
 395              'hotpink1'=>array(255,110,180),
 396              'hotpink2'=>array(238,106,167),
 397              'hotpink3'=>array(205,96,144),
 398              'hotpink4'=>array(139,58,98),
 399              'pink1'=>array(255,181,197),
 400              'pink2'=>array(238,169,184),
 401              'pink3'=>array(205,145,158),
 402              'pink4'=>array(139,99,108),
 403              'lightpink1'=>array(255,174,185),
 404              'lightpink2'=>array(238,162,173),
 405              'lightpink3'=>array(205,140,149),
 406              'lightpink4'=>array(139,95,101),
 407              'palevioletred1'=>array(255,130,171),
 408              'palevioletred2'=>array(238,121,159),
 409              'palevioletred3'=>array(205,104,137),
 410              'palevioletred4'=>array(139,71,93),
 411              'maroon1'=>array(255,52,179),
 412              'maroon2'=>array(238,48,167),
 413              'maroon3'=>array(205,41,144),
 414              'maroon4'=>array(139,28,98),
 415              'violetred1'=>array(255,62,150),
 416              'violetred2'=>array(238,58,140),
 417              'violetred3'=>array(205,50,120),
 418              'violetred4'=>array(139,34,82),
 419              'magenta1'=>array(255,0,255),
 420              'magenta2'=>array(238,0,238),
 421              'magenta3'=>array(205,0,205),
 422              'magenta4'=>array(139,0,139),
 423              'mediumred'=>array(140,34,34),
 424              'orchid1'=>array(255,131,250),
 425              'orchid2'=>array(238,122,233),
 426              'orchid3'=>array(205,105,201),
 427              'orchid4'=>array(139,71,137),
 428              'plum1'=>array(255,187,255),
 429              'plum2'=>array(238,174,238),
 430              'plum3'=>array(205,150,205),
 431              'plum4'=>array(139,102,139),
 432              'mediumorchid1'=>array(224,102,255),
 433              'mediumorchid2'=>array(209,95,238),
 434              'mediumorchid3'=>array(180,82,205),
 435              'mediumorchid4'=>array(122,55,139),
 436              'darkorchid1'=>array(191,62,255),
 437              'darkorchid2'=>array(178,58,238),
 438              'darkorchid3'=>array(154,50,205),
 439              'darkorchid4'=>array(104,34,139),
 440              'purple1'=>array(155,48,255),
 441              'purple2'=>array(145,44,238),
 442              'purple3'=>array(125,38,205),
 443              'purple4'=>array(85,26,139),
 444              'mediumpurple1'=>array(171,130,255),
 445              'mediumpurple2'=>array(159,121,238),
 446              'mediumpurple3'=>array(137,104,205),
 447              'mediumpurple4'=>array(93,71,139),
 448              'thistle1'=>array(255,225,255),
 449              'thistle2'=>array(238,210,238),
 450              'thistle3'=>array(205,181,205),
 451              'thistle4'=>array(139,123,139),
 452              'gray1'=>array(10,10,10),
 453              'gray2'=>array(40,40,30),
 454              'gray3'=>array(70,70,70),
 455              'gray4'=>array(100,100,100),
 456              'gray5'=>array(130,130,130),
 457              'gray6'=>array(160,160,160),
 458              'gray7'=>array(190,190,190),
 459              'gray8'=>array(210,210,210),
 460              'gray9'=>array(240,240,240),
 461              'darkgray'=>array(100,100,100),
 462              'darkblue'=>array(0,0,139),
 463              'darkcyan'=>array(0,139,139),
 464              'darkmagenta'=>array(139,0,139),
 465              'darkred'=>array(139,0,0),
 466              'silver'=>array(192, 192, 192),
 467              'eggplant'=>array(144,176,168),
 468              'lightgreen'=>array(144,238,144));
 469      }
 470  
 471  
 472      //----------------
 473      // PUBLIC METHODS
 474      // Colors can be specified as either
 475      // 1. #xxxxxx   HTML style
 476      // 2. "colorname"  as a named color
 477      // 3. array(r,g,b) RGB triple
 478      // This function translates this to a native RGB format and returns an
 479      // RGB triple.
 480  
 481      function Color($aColor) {
 482          if (is_string($aColor)) {
 483              $matches = array();
 484              // this regex will parse a color string and fill the $matches array as such:
 485              // 0: the full match if any
 486              // 1: a hex string preceded by a hash, can be 3 characters (#fff) or 6 (#ffffff) (4 or 5 also accepted but...)
 487              // 2,3,4: r,g,b values in hex if the first character of the string is #
 488              // 5: all alpha-numeric characters at the beginning of the string if string does not start with #
 489              // 6: alpha value prefixed by @ if supplied
 490              // 7: alpha value with @ stripped
 491              // 8: adjust value prefixed with : if supplied
 492              // 9: adjust value with : stripped
 493              $regex = '/(#([0-9a-fA-F]{1,2})([0-9a-fA-F]{1,2})([0-9a-fA-F]{1,2}))?([\w]+)?(@([\d\.,]+))?(:([\d\.,]+))?/';
 494              if(!preg_match($regex, $aColor, $matches)) {
 495                  JpGraphError::RaiseL(25078,$aColor);//(" Unknown color: $aColor");
 496              }
 497              if(empty($matches[5])) {
 498                  $r = strlen($matches[2]) == 1 ? $matches[2].$matches[2] : $matches[2];
 499                  $g = strlen($matches[3]) == 1 ? $matches[3].$matches[3] : $matches[3];
 500                  $b = strlen($matches[4]) == 1 ? $matches[4].$matches[4] : $matches[4];
 501                  $r = hexdec($r);
 502                  $g = hexdec($g);
 503                  $b = hexdec($b);
 504              }else {
 505                  if(!isset($this->rgb_table[$matches[5]]) ) {
 506                      JpGraphError::RaiseL(25078,$aColor);//(" Unknown color: $aColor");
 507                  }
 508                  $r = $this->rgb_table[$matches[5]][0];
 509                  $g = $this->rgb_table[$matches[5]][1];
 510                  $b = $this->rgb_table[$matches[5]][2];
 511              }
 512              $alpha    = isset($matches[7]) ? str_replace(',','.',$matches[7]) : 0;
 513              $adj    = isset($matches[9]) ? str_replace(',','.',$matches[9]) : 1.0;
 514  
 515              if( $adj < 0 ) {
 516                  JpGraphError::RaiseL(25077);//('Adjustment factor for color must be > 0');
 517              }
 518  
 519              // Scale adj so that an adj=2 always
 520              // makes the color 100% white (i.e. 255,255,255.
 521              // and adj=1 neutral and adj=0 black.
 522              if( $adj == 1) {
 523                  return array($r,$g,$b,$alpha);
 524              }
 525              elseif( $adj > 1 ) {
 526                  $m = ($adj-1.0)*(255-min(255,min($r,min($g,$b))));
 527                  return array(min(255,$r+$m), min(255,$g+$m), min(255,$b+$m),$alpha);
 528              }
 529              elseif( $adj < 1 ) {
 530                  $m = ($adj-1.0)*max(255,max($r,max($g,$b)));
 531                  return array(max(0,$r+$m), max(0,$g+$m), max(0,$b+$m),$alpha);
 532              }
 533          } elseif( is_array($aColor) ) {
 534              if(!isset($aColor[3])) $aColor[3] = 0;
 535              return $aColor;
 536          }
 537          else {
 538              JpGraphError::RaiseL(25079,$aColor,count($aColor));//(" Unknown color specification: $aColor , size=".count($aColor));
 539          }
 540      }
 541  
 542      // Compare two colors
 543      // return true if equal
 544      function Equal($aCol1,$aCol2) {
 545          $c1 = $this->Color($aCol1);
 546          $c2 = $this->Color($aCol2);
 547          return $c1[0]==$c2[0] && $c1[1]==$c2[1] && $c1[2]==$c2[2] ;
 548      }
 549  
 550      // Allocate a new color in the current image
 551      // Return new color index, -1 if no more colors could be allocated
 552      function Allocate($aColor,$aAlpha=0.0) {
 553          list ($r, $g, $b, $a) = $this->color($aColor);
 554          // If alpha is specified in the color string then this
 555          // takes precedence over the second argument
 556          if( $a > 0 ) {
 557              $aAlpha = $a;
 558          }
 559          if( $aAlpha < 0 || $aAlpha > 1 ) {
 560              JpGraphError::RaiseL(25080);//('Alpha parameter for color must be between 0.0 and 1.0');
 561          }
 562          return imagecolorresolvealpha($this->img, $r, $g, $b, round($aAlpha * 127));
 563      }
 564  
 565      // Try to convert an array with three valid numbers to the corresponding hex array
 566      // This is currenly only used in processing the colors for barplots in order to be able
 567      // to handle the case where the color might be specified as an array of colros as well.
 568      // In that case we must be able to find out if an array of values should be interpretated as
 569      // a single color (specifeid as an RGB triple)
 570      static function tryHexConversion($aColor) {
 571          if( is_array( $aColor ) ) {
 572              if( count( $aColor ) == 3 ) {
 573                  if( is_numeric($aColor[0]) && is_numeric($aColor[1]) && is_numeric($aColor[2]) ) {
 574                      if( ($aColor[0] >= 0 && $aColor[0] <= 255) &&
 575                          ($aColor[1] >= 0 && $aColor[1] <= 255) &&
 576                          ($aColor[2] >= 0 && $aColor[2] <= 255) ) {
 577                          return sprintf('#%02x%02x%02x',$aColor[0],$aColor[1],$aColor[2]);
 578                      }
 579                  }
 580              }
 581          }
 582          return $aColor;
 583      }
 584  
 585      // Return a RGB tripple corresponding to a position in the normal light spectrum
 586      // The argumen values is in the range [0, 1] where a value of 0 correponds to blue and
 587      // a value of 1 corresponds to red. Values in betwen is mapped to a linear interpolation
 588      // of the constituting colors in the visible color spectra.
 589      // The $aDynamicRange specified how much of the dynamic range we shold use
 590      // a value of 1.0 give the full dyanmic range and a lower value give more dark
 591      // colors. In the extreme of 0.0 then all colors will be black.
 592      static function GetSpectrum($aVal,$aDynamicRange=1.0) {
 593          if( $aVal < 0 || $aVal > 1.0001 ) {
 594              return array(0,0,0); // Invalid case - just return black
 595          }
 596  
 597          $sat = round(255*$aDynamicRange);
 598          $a = 0.25;
 599          if( $aVal <= 0.25 ) {
 600              return array(0, round($sat*$aVal/$a), $sat);
 601          }
 602          elseif( $aVal <= 0.5 ) {
 603              return array(0, $sat, round($sat-$sat*($aVal-0.25)/$a));
 604          }
 605          elseif( $aVal <= 0.75 ) {
 606              return array(round($sat*($aVal-0.5)/$a), $sat, 0);
 607          }
 608          else {
 609              return array($sat, round($sat-$sat*($aVal-0.75)/$a), 0);
 610          }
 611      }
 612  
 613  } // Class
 614  
 615  ?>

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