jpgraph_rgb.inc.php
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<?php
//=======================================================================
// File: JPGRAPH_RGB.INC.PHP
// Description: Class to handle RGb color space specification and
// named colors
// Created: 2001-01-08 (Refactored to separate file 2008-08-01)
// Ver: $Id: jpgraph_rgb.inc.php 1893 2009-10-02 23:15:25Z ljp $
//
// Copyright (c) Asial Corporation. All rights reserved.
//========================================================================
/*===================================================
// CLASS RGB
// Description: Color definitions as RGB triples
//===================================================
*/
class RGB {
public $rgb_table;
public $img;
function __construct($aImg=null) {
$this->img = $aImg;
// Conversion array between color names and RGB
$this->rgb_table = array(
'aqua'=> array(0,255,255),
'lime'=> array(0,255,0),
'teal'=> array(0,128,128),
'whitesmoke'=>array(245,245,245),
'gainsboro'=>array(220,220,220),
'oldlace'=>array(253,245,230),
'linen'=>array(250,240,230),
'antiquewhite'=>array(250,235,215),
'papayawhip'=>array(255,239,213),
'blanchedalmond'=>array(255,235,205),
'bisque'=>array(255,228,196),
'peachpuff'=>array(255,218,185),
'navajowhite'=>array(255,222,173),
'moccasin'=>array(255,228,181),
'cornsilk'=>array(255,248,220),
'ivory'=>array(255,255,240),
'lemonchiffon'=>array(255,250,205),
'seashell'=>array(255,245,238),
'mintcream'=>array(245,255,250),
'azure'=>array(240,255,255),
'aliceblue'=>array(240,248,255),
'lavender'=>array(230,230,250),
'lavenderblush'=>array(255,240,245),
'mistyrose'=>array(255,228,225),
'white'=>array(255,255,255),
'black'=>array(0,0,0),
'darkslategray'=>array(47,79,79),
'dimgray'=>array(105,105,105),
'slategray'=>array(112,128,144),
'lightslategray'=>array(119,136,153),
'gray'=>array(190,190,190),
'lightgray'=>array(211,211,211),
'midnightblue'=>array(25,25,112),
'navy'=>array(0,0,128),
'indigo'=>array(75,0,130),
'electricindigo'=>array(102,0,255),
'deepindigo'=>array(138,43,226),
'pigmentindigo'=>array(75,0,130),
'indigodye'=>array(0,65,106),
'cornflowerblue'=>array(100,149,237),
'darkslateblue'=>array(72,61,139),
'slateblue'=>array(106,90,205),
'mediumslateblue'=>array(123,104,238),
'lightslateblue'=>array(132,112,255),
'mediumblue'=>array(0,0,205),
'royalblue'=>array(65,105,225),
'blue'=>array(0,0,255),
'dodgerblue'=>array(30,144,255),
'deepskyblue'=>array(0,191,255),
'skyblue'=>array(135,206,235),
'lightskyblue'=>array(135,206,250),
'steelblue'=>array(70,130,180),
'lightred'=>array(211,167,168),
'lightsteelblue'=>array(176,196,222),
'lightblue'=>array(173,216,230),
'powderblue'=>array(176,224,230),
'paleturquoise'=>array(175,238,238),
'darkturquoise'=>array(0,206,209),
'mediumturquoise'=>array(72,209,204),
'turquoise'=>array(64,224,208),
'cyan'=>array(0,255,255),
'lightcyan'=>array(224,255,255),
'cadetblue'=>array(95,158,160),
'mediumaquamarine'=>array(102,205,170),
'aquamarine'=>array(127,255,212),
'darkgreen'=>array(0,100,0),
'darkolivegreen'=>array(85,107,47),
'darkseagreen'=>array(143,188,143),
'seagreen'=>array(46,139,87),
'mediumseagreen'=>array(60,179,113),
'lightseagreen'=>array(32,178,170),
'palegreen'=>array(152,251,152),
'springgreen'=>array(0,255,127),
'lawngreen'=>array(124,252,0),
'green'=>array(0,255,0),
'chartreuse'=>array(127,255,0),
'mediumspringgreen'=>array(0,250,154),
'greenyellow'=>array(173,255,47),
'limegreen'=>array(50,205,50),
'yellowgreen'=>array(154,205,50),
'forestgreen'=>array(34,139,34),
'olivedrab'=>array(107,142,35),
'darkkhaki'=>array(189,183,107),
'khaki'=>array(240,230,140),
'palegoldenrod'=>array(238,232,170),
'lightgoldenrodyellow'=>array(250,250,210),
'lightyellow'=>array(255,255,200),
'yellow'=>array(255,255,0),
'gold'=>array(255,215,0),
'lightgoldenrod'=>array(238,221,130),
'goldenrod'=>array(218,165,32),
'darkgoldenrod'=>array(184,134,11),
'rosybrown'=>array(188,143,143),
'indianred'=>array(205,92,92),
'saddlebrown'=>array(139,69,19),
'sienna'=>array(160,82,45),
'peru'=>array(205,133,63),
'burlywood'=>array(222,184,135),
'beige'=>array(245,245,220),
'wheat'=>array(245,222,179),
'sandybrown'=>array(244,164,96),
'tan'=>array(210,180,140),
'chocolate'=>array(210,105,30),
'firebrick'=>array(178,34,34),
'brown'=>array(165,42,42),
'darksalmon'=>array(233,150,122),
'salmon'=>array(250,128,114),
'lightsalmon'=>array(255,160,122),
'orange'=>array(255,165,0),
'darkorange'=>array(255,140,0),
'coral'=>array(255,127,80),
'lightcoral'=>array(240,128,128),
'tomato'=>array(255,99,71),
'orangered'=>array(255,69,0),
'red'=>array(255,0,0),
'hotpink'=>array(255,105,180),
'deeppink'=>array(255,20,147),
'pink'=>array(255,192,203),
'lightpink'=>array(255,182,193),
'palevioletred'=>array(219,112,147),
'maroon'=>array(176,48,96),
'mediumvioletred'=>array(199,21,133),
'violetred'=>array(208,32,144),
'magenta'=>array(255,0,255),
'violet'=>array(238,130,238),
'plum'=>array(221,160,221),
'orchid'=>array(218,112,214),
'mediumorchid'=>array(186,85,211),
'darkorchid'=>array(153,50,204),
'darkviolet'=>array(148,0,211),
'blueviolet'=>array(138,43,226),
'purple'=>array(160,32,240),
'mediumpurple'=>array(147,112,219),
'thistle'=>array(216,191,216),
'snow1'=>array(255,250,250),
'snow2'=>array(238,233,233),
'snow3'=>array(205,201,201),
'snow4'=>array(139,137,137),
'seashell1'=>array(255,245,238),
'seashell2'=>array(238,229,222),
'seashell3'=>array(205,197,191),
'seashell4'=>array(139,134,130),
'AntiqueWhite1'=>array(255,239,219),
'AntiqueWhite2'=>array(238,223,204),
'AntiqueWhite3'=>array(205,192,176),
'AntiqueWhite4'=>array(139,131,120),
'bisque1'=>array(255,228,196),
'bisque2'=>array(238,213,183),
'bisque3'=>array(205,183,158),
'bisque4'=>array(139,125,107),
'peachPuff1'=>array(255,218,185),
'peachpuff2'=>array(238,203,173),
'peachpuff3'=>array(205,175,149),
'peachpuff4'=>array(139,119,101),
'navajowhite1'=>array(255,222,173),
'navajowhite2'=>array(238,207,161),
'navajowhite3'=>array(205,179,139),
'navajowhite4'=>array(139,121,94),
'lemonchiffon1'=>array(255,250,205),
'lemonchiffon2'=>array(238,233,191),
'lemonchiffon3'=>array(205,201,165),
'lemonchiffon4'=>array(139,137,112),
'ivory1'=>array(255,255,240),
'ivory2'=>array(238,238,224),
'ivory3'=>array(205,205,193),
'ivory4'=>array(139,139,131),
'honeydew'=>array(193,205,193),
'lavenderblush1'=>array(255,240,245),
'lavenderblush2'=>array(238,224,229),
'lavenderblush3'=>array(205,193,197),
'lavenderblush4'=>array(139,131,134),
'mistyrose1'=>array(255,228,225),
'mistyrose2'=>array(238,213,210),
'mistyrose3'=>array(205,183,181),
'mistyrose4'=>array(139,125,123),
'azure1'=>array(240,255,255),
'azure2'=>array(224,238,238),
'azure3'=>array(193,205,205),
'azure4'=>array(131,139,139),
'slateblue1'=>array(131,111,255),
'slateblue2'=>array(122,103,238),
'slateblue3'=>array(105,89,205),
'slateblue4'=>array(71,60,139),
'royalblue1'=>array(72,118,255),
'royalblue2'=>array(67,110,238),
'royalblue3'=>array(58,95,205),
'royalblue4'=>array(39,64,139),
'dodgerblue1'=>array(30,144,255),
'dodgerblue2'=>array(28,134,238),
'dodgerblue3'=>array(24,116,205),
'dodgerblue4'=>array(16,78,139),
'steelblue1'=>array(99,184,255),
'steelblue2'=>array(92,172,238),
'steelblue3'=>array(79,148,205),
'steelblue4'=>array(54,100,139),
'deepskyblue1'=>array(0,191,255),
'deepskyblue2'=>array(0,178,238),
'deepskyblue3'=>array(0,154,205),
'deepskyblue4'=>array(0,104,139),
'skyblue1'=>array(135,206,255),
'skyblue2'=>array(126,192,238),
'skyblue3'=>array(108,166,205),
'skyblue4'=>array(74,112,139),
'lightskyblue1'=>array(176,226,255),
'lightskyblue2'=>array(164,211,238),
'lightskyblue3'=>array(141,182,205),
'lightskyblue4'=>array(96,123,139),
'slategray1'=>array(198,226,255),
'slategray2'=>array(185,211,238),
'slategray3'=>array(159,182,205),
'slategray4'=>array(108,123,139),
'lightsteelblue1'=>array(202,225,255),
'lightsteelblue2'=>array(188,210,238),
'lightsteelblue3'=>array(162,181,205),
'lightsteelblue4'=>array(110,123,139),
'lightblue1'=>array(191,239,255),
'lightblue2'=>array(178,223,238),
'lightblue3'=>array(154,192,205),
'lightblue4'=>array(104,131,139),
'lightcyan1'=>array(224,255,255),
'lightcyan2'=>array(209,238,238),
'lightcyan3'=>array(180,205,205),
'lightcyan4'=>array(122,139,139),
'paleturquoise1'=>array(187,255,255),
'paleturquoise2'=>array(174,238,238),
'paleturquoise3'=>array(150,205,205),
'paleturquoise4'=>array(102,139,139),
'cadetblue1'=>array(152,245,255),
'cadetblue2'=>array(142,229,238),
'cadetblue3'=>array(122,197,205),
'cadetblue4'=>array(83,134,139),
'turquoise1'=>array(0,245,255),
'turquoise2'=>array(0,229,238),
'turquoise3'=>array(0,197,205),
'turquoise4'=>array(0,134,139),
'cyan1'=>array(0,255,255),
'cyan2'=>array(0,238,238),
'cyan3'=>array(0,205,205),
'cyan4'=>array(0,139,139),
'darkslategray1'=>array(151,255,255),
'darkslategray2'=>array(141,238,238),
'darkslategray3'=>array(121,205,205),
'darkslategray4'=>array(82,139,139),
'aquamarine1'=>array(127,255,212),
'aquamarine2'=>array(118,238,198),
'aquamarine3'=>array(102,205,170),
'aquamarine4'=>array(69,139,116),
'darkseagreen1'=>array(193,255,193),
'darkseagreen2'=>array(180,238,180),
'darkseagreen3'=>array(155,205,155),
'darkseagreen4'=>array(105,139,105),
'seagreen1'=>array(84,255,159),
'seagreen2'=>array(78,238,148),
'seagreen3'=>array(67,205,128),
'seagreen4'=>array(46,139,87),
'palegreen1'=>array(154,255,154),
'palegreen2'=>array(144,238,144),
'palegreen3'=>array(124,205,124),
'palegreen4'=>array(84,139,84),
'springgreen1'=>array(0,255,127),
'springgreen2'=>array(0,238,118),
'springgreen3'=>array(0,205,102),
'springgreen4'=>array(0,139,69),
'chartreuse1'=>array(127,255,0),
'chartreuse2'=>array(118,238,0),
'chartreuse3'=>array(102,205,0),
'chartreuse4'=>array(69,139,0),
'olivedrab1'=>array(192,255,62),
'olivedrab2'=>array(179,238,58),
'olivedrab3'=>array(154,205,50),
'olivedrab4'=>array(105,139,34),
'darkolivegreen1'=>array(202,255,112),
'darkolivegreen2'=>array(188,238,104),
'darkolivegreen3'=>array(162,205,90),
'darkolivegreen4'=>array(110,139,61),
'khaki1'=>array(255,246,143),
'khaki2'=>array(238,230,133),
'khaki3'=>array(205,198,115),
'khaki4'=>array(139,134,78),
'lightgoldenrod1'=>array(255,236,139),
'lightgoldenrod2'=>array(238,220,130),
'lightgoldenrod3'=>array(205,190,112),
'lightgoldenrod4'=>array(139,129,76),
'yellow1'=>array(255,255,0),
'yellow2'=>array(238,238,0),
'yellow3'=>array(205,205,0),
'yellow4'=>array(139,139,0),
'gold1'=>array(255,215,0),
'gold2'=>array(238,201,0),
'gold3'=>array(205,173,0),
'gold4'=>array(139,117,0),
'goldenrod1'=>array(255,193,37),
'goldenrod2'=>array(238,180,34),
'goldenrod3'=>array(205,155,29),
'goldenrod4'=>array(139,105,20),
'darkgoldenrod1'=>array(255,185,15),
'darkgoldenrod2'=>array(238,173,14),
'darkgoldenrod3'=>array(205,149,12),
'darkgoldenrod4'=>array(139,101,8),
'rosybrown1'=>array(255,193,193),
'rosybrown2'=>array(238,180,180),
'rosybrown3'=>array(205,155,155),
'rosybrown4'=>array(139,105,105),
'indianred1'=>array(255,106,106),
'indianred2'=>array(238,99,99),
'indianred3'=>array(205,85,85),
'indianred4'=>array(139,58,58),
'sienna1'=>array(255,130,71),
'sienna2'=>array(238,121,66),
'sienna3'=>array(205,104,57),
'sienna4'=>array(139,71,38),
'burlywood1'=>array(255,211,155),
'burlywood2'=>array(238,197,145),
'burlywood3'=>array(205,170,125),
'burlywood4'=>array(139,115,85),
'wheat1'=>array(255,231,186),
'wheat2'=>array(238,216,174),
'wheat3'=>array(205,186,150),
'wheat4'=>array(139,126,102),
'tan1'=>array(255,165,79),
'tan2'=>array(238,154,73),
'tan3'=>array(205,133,63),
'tan4'=>array(139,90,43),
'chocolate1'=>array(255,127,36),
'chocolate2'=>array(238,118,33),
'chocolate3'=>array(205,102,29),
'chocolate4'=>array(139,69,19),
'firebrick1'=>array(255,48,48),
'firebrick2'=>array(238,44,44),
'firebrick3'=>array(205,38,38),
'firebrick4'=>array(139,26,26),
'brown1'=>array(255,64,64),
'brown2'=>array(238,59,59),
'brown3'=>array(205,51,51),
'brown4'=>array(139,35,35),
'salmon1'=>array(255,140,105),
'salmon2'=>array(238,130,98),
'salmon3'=>array(205,112,84),
'salmon4'=>array(139,76,57),
'lightsalmon1'=>array(255,160,122),
'lightsalmon2'=>array(238,149,114),
'lightsalmon3'=>array(205,129,98),
'lightsalmon4'=>array(139,87,66),
'orange1'=>array(255,165,0),
'orange2'=>array(238,154,0),
'orange3'=>array(205,133,0),
'orange4'=>array(139,90,0),
'darkorange1'=>array(255,127,0),
'darkorange2'=>array(238,118,0),
'darkorange3'=>array(205,102,0),
'darkorange4'=>array(139,69,0),
'coral1'=>array(255,114,86),
'coral2'=>array(238,106,80),
'coral3'=>array(205,91,69),
'coral4'=>array(139,62,47),
'tomato1'=>array(255,99,71),
'tomato2'=>array(238,92,66),
'tomato3'=>array(205,79,57),
'tomato4'=>array(139,54,38),
'orangered1'=>array(255,69,0),
'orangered2'=>array(238,64,0),
'orangered3'=>array(205,55,0),
'orangered4'=>array(139,37,0),
'deeppink1'=>array(255,20,147),
'deeppink2'=>array(238,18,137),
'deeppink3'=>array(205,16,118),
'deeppink4'=>array(139,10,80),
'hotpink1'=>array(255,110,180),
'hotpink2'=>array(238,106,167),
'hotpink3'=>array(205,96,144),
'hotpink4'=>array(139,58,98),
'pink1'=>array(255,181,197),
'pink2'=>array(238,169,184),
'pink3'=>array(205,145,158),
'pink4'=>array(139,99,108),
'lightpink1'=>array(255,174,185),
'lightpink2'=>array(238,162,173),
'lightpink3'=>array(205,140,149),
'lightpink4'=>array(139,95,101),
'palevioletred1'=>array(255,130,171),
'palevioletred2'=>array(238,121,159),
'palevioletred3'=>array(205,104,137),
'palevioletred4'=>array(139,71,93),
'maroon1'=>array(255,52,179),
'maroon2'=>array(238,48,167),
'maroon3'=>array(205,41,144),
'maroon4'=>array(139,28,98),
'violetred1'=>array(255,62,150),
'violetred2'=>array(238,58,140),
'violetred3'=>array(205,50,120),
'violetred4'=>array(139,34,82),
'magenta1'=>array(255,0,255),
'magenta2'=>array(238,0,238),
'magenta3'=>array(205,0,205),
'magenta4'=>array(139,0,139),
'mediumred'=>array(140,34,34),
'orchid1'=>array(255,131,250),
'orchid2'=>array(238,122,233),
'orchid3'=>array(205,105,201),
'orchid4'=>array(139,71,137),
'plum1'=>array(255,187,255),
'plum2'=>array(238,174,238),
'plum3'=>array(205,150,205),
'plum4'=>array(139,102,139),
'mediumorchid1'=>array(224,102,255),
'mediumorchid2'=>array(209,95,238),
'mediumorchid3'=>array(180,82,205),
'mediumorchid4'=>array(122,55,139),
'darkorchid1'=>array(191,62,255),
'darkorchid2'=>array(178,58,238),
'darkorchid3'=>array(154,50,205),
'darkorchid4'=>array(104,34,139),
'purple1'=>array(155,48,255),
'purple2'=>array(145,44,238),
'purple3'=>array(125,38,205),
'purple4'=>array(85,26,139),
'mediumpurple1'=>array(171,130,255),
'mediumpurple2'=>array(159,121,238),
'mediumpurple3'=>array(137,104,205),
'mediumpurple4'=>array(93,71,139),
'thistle1'=>array(255,225,255),
'thistle2'=>array(238,210,238),
'thistle3'=>array(205,181,205),
'thistle4'=>array(139,123,139),
'gray1'=>array(10,10,10),
'gray2'=>array(40,40,30),
'gray3'=>array(70,70,70),
'gray4'=>array(100,100,100),
'gray5'=>array(130,130,130),
'gray6'=>array(160,160,160),
'gray7'=>array(190,190,190),
'gray8'=>array(210,210,210),
'gray9'=>array(240,240,240),
'darkgray'=>array(100,100,100),
'darkblue'=>array(0,0,139),
'darkcyan'=>array(0,139,139),
'darkmagenta'=>array(139,0,139),
'darkred'=>array(139,0,0),
'silver'=>array(192, 192, 192),
'eggplant'=>array(144,176,168),
'lightgreen'=>array(144,238,144));
}
//----------------
// PUBLIC METHODS
// Colors can be specified as either
// 1. #xxxxxx HTML style
// 2. "colorname" as a named color
// 3. array(r,g,b) RGB triple
// This function translates this to a native RGB format and returns an
// RGB triple.
function Color($aColor) {
if (is_string($aColor)) {
$matches = array();
// this regex will parse a color string and fill the $matches array as such:
// 0: the full match if any
// 1: a hex string preceded by a hash, can be 3 characters (#fff) or 6 (#ffffff) (4 or 5 also accepted but...)
// 2,3,4: r,g,b values in hex if the first character of the string is #
// 5: all alpha-numeric characters at the beginning of the string if string does not start with #
// 6: alpha value prefixed by @ if supplied
// 7: alpha value with @ stripped
// 8: adjust value prefixed with : if supplied
// 9: adjust value with : stripped
$regex = '/(#([0-9a-fA-F]{1,2})([0-9a-fA-F]{1,2})([0-9a-fA-F]{1,2}))?([\w]+)?(@([\d\.,]+))?(:([\d\.,]+))?/';
if(!preg_match($regex, $aColor, $matches)) {
JpGraphError::RaiseL(25078,$aColor);//(" Unknown color: $aColor");
}
if(empty($matches[5])) {
$r = strlen($matches[2]) == 1 ? $matches[2].$matches[2] : $matches[2];
$g = strlen($matches[3]) == 1 ? $matches[3].$matches[3] : $matches[3];
$b = strlen($matches[4]) == 1 ? $matches[4].$matches[4] : $matches[4];
$r = hexdec($r);
$g = hexdec($g);
$b = hexdec($b);
}else {
if(!isset($this->rgb_table[$matches[5]]) ) {
JpGraphError::RaiseL(25078,$aColor);//(" Unknown color: $aColor");
}
$r = $this->rgb_table[$matches[5]][0];
$g = $this->rgb_table[$matches[5]][1];
$b = $this->rgb_table[$matches[5]][2];
}
$alpha = isset($matches[7]) ? str_replace(',','.',$matches[7]) : 0;
$adj = isset($matches[9]) ? str_replace(',','.',$matches[9]) : 1.0;
if( $adj < 0 ) {
JpGraphError::RaiseL(25077);//('Adjustment factor for color must be > 0');
}
// Scale adj so that an adj=2 always
// makes the color 100% white (i.e. 255,255,255.
// and adj=1 neutral and adj=0 black.
if( $adj == 1) {
return array($r,$g,$b,$alpha);
}
elseif( $adj > 1 ) {
$m = ($adj-1.0)*(255-min(255,min($r,min($g,$b))));
return array(min(255,$r+$m), min(255,$g+$m), min(255,$b+$m),$alpha);
}
elseif( $adj < 1 ) {
$m = ($adj-1.0)*max(255,max($r,max($g,$b)));
return array(max(0,$r+$m), max(0,$g+$m), max(0,$b+$m),$alpha);
}
} elseif( is_array($aColor) ) {
if(!isset($aColor[3])) $aColor[3] = 0;
return $aColor;
}
else {
JpGraphError::RaiseL(25079,$aColor,count($aColor));//(" Unknown color specification: $aColor , size=".count($aColor));
}
}
// Compare two colors
// return true if equal
function Equal($aCol1,$aCol2) {
$c1 = $this->Color($aCol1);
$c2 = $this->Color($aCol2);
return $c1[0]==$c2[0] && $c1[1]==$c2[1] && $c1[2]==$c2[2] ;
}
// Allocate a new color in the current image
// Return new color index, -1 if no more colors could be allocated
function Allocate($aColor,$aAlpha=0.0) {
list ($r, $g, $b, $a) = $this->color($aColor);
// If alpha is specified in the color string then this
// takes precedence over the second argument
if( $a > 0 ) {
$aAlpha = $a;
}
if( $aAlpha < 0 || $aAlpha > 1 ) {
JpGraphError::RaiseL(25080);//('Alpha parameter for color must be between 0.0 and 1.0');
}
return imagecolorresolvealpha($this->img, $r, $g, $b, round($aAlpha * 127));
}
// Try to convert an array with three valid numbers to the corresponding hex array
// This is currenly only used in processing the colors for barplots in order to be able
// to handle the case where the color might be specified as an array of colros as well.
// In that case we must be able to find out if an array of values should be interpretated as
// a single color (specifeid as an RGB triple)
static function tryHexConversion($aColor) {
if( is_array( $aColor ) ) {
if( count( $aColor ) == 3 ) {
if( is_numeric($aColor[0]) && is_numeric($aColor[1]) && is_numeric($aColor[2]) ) {
if( ($aColor[0] >= 0 && $aColor[0] <= 255) &&
($aColor[1] >= 0 && $aColor[1] <= 255) &&
($aColor[2] >= 0 && $aColor[2] <= 255) ) {
return sprintf('#%02x%02x%02x',$aColor[0],$aColor[1],$aColor[2]);
}
}
}
}
return $aColor;
}
// Return a RGB tripple corresponding to a position in the normal light spectrum
// The argumen values is in the range [0, 1] where a value of 0 correponds to blue and
// a value of 1 corresponds to red. Values in betwen is mapped to a linear interpolation
// of the constituting colors in the visible color spectra.
// The $aDynamicRange specified how much of the dynamic range we shold use
// a value of 1.0 give the full dyanmic range and a lower value give more dark
// colors. In the extreme of 0.0 then all colors will be black.
static function GetSpectrum($aVal,$aDynamicRange=1.0) {
if( $aVal < 0 || $aVal > 1.0001 ) {
return array(0,0,0); // Invalid case - just return black
}
$sat = round(255*$aDynamicRange);
$a = 0.25;
if( $aVal <= 0.25 ) {
return array(0, round($sat*$aVal/$a), $sat);
}
elseif( $aVal <= 0.5 ) {
return array(0, $sat, round($sat-$sat*($aVal-0.25)/$a));
}
elseif( $aVal <= 0.75 ) {
return array(round($sat*($aVal-0.5)/$a), $sat, 0);
}
else {
return array($sat, round($sat-$sat*($aVal-0.75)/$a), 0);
}
}
} // Class
?>