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  1. <?php
  2. //$colors = $_GET['color'];//Thought these variables made more sense up here.
  3. $gradient = "red,orange,yellow,green";//$_GET['gradient'];
  4. if (isset($colors)){ //added these to avoid sending a blank page with image headers. 
  5.     header('Content-Type: image/png');
  6.     $type = 'color';
  7. } else if (isset($gradient)){
  8.     header('Content-Type: image/png');
  9.     $type = 'gradient';
  10. }
  11.  
  12. $colornames = array(
  13.     "pink" => "FFC0CB",
  14.     "lightpink" => "FFB6C1",
  15.     "hotpink" => "FF69B4",
  16.     "deeppink" => "FF1493",
  17.     "palevioletred" => "DB7093",
  18.     "mediumvioletred" => "C71585",
  19.     "lightsalmon" => "FFA07A",
  20.     "salmon" => "FA8072",
  21.     "darksalmon" => "E9967A",
  22.     "lightcoral" => "F08080",
  23.     "indianred" => "CD5C5C",
  24.     "crimson" => "DC143C",
  25.     "firebrick" => "B22222",
  26.     "darkred" => "8B0000",
  27.     "red" => "FF0000",
  28.     "orangered" => "FF4500",
  29.     "tomato" => "FF6347",
  30.     "coral" => "FF7F50",
  31.     "darkorange" => "FF8C00",
  32.     "orange" => "FFA500",
  33.     "gold" => "FFD700",
  34.     "yellow" => "FFFF00",
  35.     "lightyellow" => "FFFFE0",
  36.     "lemonchiffon" => "FFFACD",
  37.     "lightgoldenrodyellow" => "FAFAD2",
  38.     "papayawhip" => "FFEFD5",
  39.     "moccasin" => "FFE4B5",
  40.     "peachpuff" => "FFDAB9",
  41.     "palegoldenrod" => "EEE8AA",
  42.     "khaki" => "F0E68C",
  43.     "darkkhaki" => "BDB76B",
  44.     "cornsilk" => "FFF8DC",
  45.     "blanchedalmond" => "FFEBCD",
  46.     "bisque" => "FFE4C4",
  47.     "navajowhite" => "FFDEAD",
  48.     "wheat" => "F5DEB3",
  49.     "burlywood" => "DEB887",
  50.     "tan" => "D2B48C",
  51.     "rosybrown" => "BC8F8F",
  52.     "sandybrown" => "F4A460",
  53.     "goldenrod" => "DAA520",
  54.     "darkgoldenrod" => "B8860B",
  55.     "peru" => "CD853F",
  56.     "chocolate" => "D2691E",
  57.     "saddlebrown" => "8B4513",
  58.     "sienna" => "A0522D",
  59.     "brown" => "A52A2A",
  60.     "maroon" => "800000",
  61.     "darkolivegreen" => "556B2F",
  62.     "olive" => "808000",
  63.     "olivedrab" => "6B8E23",
  64.     "yellowgreen" => "9ACD32",
  65.     "limegreen" => "32CD32",
  66.     "lime" => "00FF00",
  67.     "lawngreen" => "7CFC00",
  68.     "chartreuse" => "7FFF00",
  69.     "greenyellow" => "ADFF2F",
  70.     "springgreen" => "00FF7F",
  71.     "mediumspringgreen" => "00FA9A",
  72.     "lightgreen" => "90EE90",
  73.     "palegreen" => "98FB98",
  74.     "darkseagreen" => "8FBC8F",
  75.     "mediumseagreen" => "3CB371",
  76.     "seagreen" => "2E8B57",
  77.     "forestgreen" => "228B22",
  78.     "green" => "008000",
  79.     "darkgreen" => "006400",
  80.     "mediumaquamarine" => "66CDAA",
  81.     "aqua" => "00FFFF",
  82.     "cyan" => "00FFFF",
  83.     "lightcyan" => "E0FFFF",
  84.     "paleturquoise" => "AFEEEE",
  85.     "aquamarine" => "7FFFD4",
  86.     "turquoise" => "40E0D0",
  87.     "mediumturquoise" => "48D1CC",
  88.     "darkturquoise" => "00CED1",
  89.     "lightseagreen" => "20B2AA",
  90.     "cadetblue" => "5F9EA0",
  91.     "darkcyan" => "008B8B",
  92.     "teal" => "008080",
  93.     "lightsteelblue" => "B0C4DE",
  94.     "powderblue" => "B0E0E6",
  95.     "lightblue" => "ADD8E6",
  96.     "skyblue" => "87CEEB",
  97.     "lightskyblue" => "87CEFA",
  98.     "deepskyblue" => "00BFFF",
  99.     "dodgerblue" => "1E90FF",
  100.     "cornflowerblue" => "6495ED",
  101.     "steelblue" => "4682B4",
  102.     "royalblue" => "4169E1",
  103.     "blue" => "0000FF",
  104.     "mediumblue" => "0000CD",
  105.     "darkblue" => "00008B",
  106.     "navy" => "000080",
  107.     "midnightblue" => "191970",
  108.     "lavender" => "E6E6FA",
  109.     "thistle" => "D8BFD8",
  110.     "plum" => "DDA0DD",
  111.     "violet" => "EE82EE",
  112.     "orchid" => "DA70D6",
  113.     "fuchsia" => "FF00FF",
  114.     "magenta" => "FF00FF",
  115.     "mediumorchid" => "BA55D3",
  116.     "mediumpurple" => "9370DB",
  117.     "blueviolet" => "8A2BE2",
  118.     "darkviolet" => "9400D3",
  119.     "darkorchid" => "9932CC",
  120.     "darkmagenta" => "8B008B",
  121.     "purple" => "800080",
  122.     "indigo" => "4B0082",
  123.     "darkslateblue" => "483D8B",
  124.     "slateblue" => "6A5ACD",
  125.     "mediumslateblue" => "7B68EE",
  126.     "white" => "FFFFFF",
  127.     "snow" => "FFFAFA",
  128.     "honeydew" => "F0FFF0",
  129.     "mintcream" => "F5FFFA",
  130.     "azure" => "F0FFFF",
  131.     "aliceblue" => "F0F8FF",
  132.     "ghostwhite" => "F8F8FF",
  133.     "whitesmoke" => "F5F5F5",
  134.     "seashell" => "FFF5EE",
  135.     "beige" => "F5F5DC",
  136.     "oldlace" => "FDF5E6",
  137.     "floralwhite" => "FFFAF0",
  138.     "ivory" => "FFFFF0",
  139.     "antiquewhite" => "FAEBD7",
  140.     "linen" => "FAF0E6",
  141.     "lavenderblush" => "FFF0F5",
  142.     "mistyrose" => "FFE4E1",
  143.     "gainsboro" => "DCDCDC",
  144.     "lightgray" => "D3D3D3",
  145.     "lightgrey" => "D3D3D3",
  146.     "silver" => "C0C0C0",
  147.     "darkgray" => "A9A9A9",
  148.     "darkgrey" => "A9A9A9",
  149.     "gray" => "808080",
  150.     "grey" => "808080",
  151.     "dimgray" => "696969",
  152.     "dimgrey" => "696969",
  153.     "lightslategray" => "778899",
  154.     "lightslategrey" => "778899",
  155.     "slategray" => "708090",
  156.     "slategrey" => "708090",
  157.     "darkslategray" => "2F4F4F",
  158.     "darkslategrey" => "2F4F4F",
  159.     "black" => "000000"
  160. );
  161.  
  162.  
  163. function rgbFromHex($hexValue){
  164.     if (strlen($hexValue) == 3) { //shorthand check
  165.         $r = hexdec(str_repeat($hexValue[0], 2));
  166.         $g = hexdec(str_repeat($hexValue[1], 2));
  167.         $b = hexdec(str_repeat($hexValue[2], 2));
  168.     }
  169.     else if (strlen($hexValue) == 6){ //standard hex color
  170.         $r = hexdec(substr($hexValue, 0, 2));
  171.         $g = hexdec(substr($hexValue, 2, 2));
  172.         $b = hexdec(substr($hexValue, 4, 2));
  173.     }
  174.     else{
  175.         $r = 0;
  176.         $g = 0;
  177.         $b = 0;
  178.     }
  179.  
  180.     $rgb = array(
  181.         $r,
  182.         $g,
  183.         $b
  184.     );
  185.     return $rgb;
  186. }
  187.  
  188. function getHexByName($name){
  189.     global $colornames;
  190.     if (isset($colornames[$name])) {
  191.         return $colornames[$name];
  192.     }
  193.     else {
  194.         return null;
  195.     }
  196. }
  197.  
  198. /*
  199.  * $input - a string, possibly comma-separated list of HexValues and/or color names
  200.  *
  201.  * returns an array of [r, g, b] arrays
  202.  */
  203. function parseColors($input){
  204.     $colorArray = array();
  205.     $parts = explode(",", $input);
  206.  
  207.     foreach($parts as $color){
  208.         $byName = getHexByName($color);
  209.         if(!isset($byName)){
  210.             array_push($colorArray, rgbFromHex($color));
  211.         } else{
  212.             if (strpos($byName, ",") !== FALSE){
  213.                 // we're dealing with a multi-part name, eg: roygbiv
  214.                 foreach(parseColors($byName) as $col){
  215.                     array_push($colorArray, $col);
  216.                 }
  217.             } else{
  218.                 array_push($colorArray, rgbFromHex($byName));
  219.             }
  220.         }
  221.     }
  222.  
  223.     return $colorArray;
  224. }
  225.  
  226. /* 
  227.  * $colorArray - an array of [r, g, b] arrays. 
  228.  *
  229.  * returns an array of [r, g, b] arrays. 
  230.  */
  231. function interpolateGradient($colorArray){
  232.     $steps = 200;
  233. 	$arrLen = count($colorArray) - 1;
  234. 	$stepsPerGrad = $steps/$arrLen;
  235.     $output = array();
  236.  
  237.     for($step = 0;$step < $steps; $step++){
  238. 		$index = floor($step/$steps*$arrLen);
  239.         $curr = $colorArray[$index];
  240.         $next = $colorArray[$index+1];
  241.  
  242.         array_push($output, array(
  243.             floor($curr[0] + ($step % $stepsPerGrad) / $stepsPerGrad * ($next[0] - $curr[0])),
  244.             floor($curr[1] + ($step % $stepsPerGrad) / $stepsPerGrad * ($next[1] - $curr[1])),
  245.             floor($curr[2] + ($step % $stepsPerGrad) / $stepsPerGrad * ($next[2] - $curr[2]))
  246.         ));
  247.     }
  248.  
  249.  
  250.     return $output;
  251. }
  252.  
  253. /* 
  254.  * $colorArray - an array of [r, g, b] arrays. 
  255.  *
  256.  * returns an image. 
  257.  */
  258. function createSwatch($colorArray){
  259.     $img = imagecreate(200, 40);
  260.     $colWidth = 200 / count($colorArray);
  261.     $x = 0;
  262.     foreach($colorArray as $rgb) {
  263.         $color = imagecolorallocate($img, $rgb[0], $rgb[1], $rgb[2]);
  264.         imagefilledrectangle($img, $x, 0, $x + $colWidth, 40, $color);
  265.         $x += $colWidth;
  266.     }
  267.     return imagepng($img);
  268. }
  269.  
  270.  
  271.  
  272.  
  273. if ($type == 'color') {
  274.     $colorArray = parseColors(strtolower($colors));
  275. } else if ($type == 'gradient'){
  276.     $colorArray = interpolateGradient(parseColors(strtolower($gradient)));
  277. } else {
  278.     echo 'GO AWAY';
  279. }
  280.  
  281. if (isset($colorArray)){
  282.     createSwatch($colorArray);
  283. }
  284.  
  285. ?>
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https://ideone.com/1eLHXp
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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