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  1. <?php
  2. header('Content-Type: image/png');
  3. $colornames = array(
  4.     "pink" => "FFC0CB",
  5. 	"lightpink" => "FFB6C1",
  6. 	"hotpink" => "FF69B4",
  7. 	"deeppink" => "FF1493",
  8. 	"palevioletred" => "DB7093",
  9. 	"mediumvioletred" => "C71585",
  10. 	"lightsalmon" => "FFA07A",
  11. 	"salmon" => "FA8072",
  12. 	"darksalmon" => "E9967A",
  13. 	"lightcoral" => "F08080",
  14. 	"indianred" => "CD5C5C",
  15. 	"crimson" => "DC143C",
  16. 	"firebrick" => "B22222",
  17. 	"darkred" => "8B0000",
  18. 	"red" => "FF0000",
  19. 	"rlemon" => "C40C0C",
  20. 	"orangered" => "FF4500",
  21. 	"tomato" => "FF6347",
  22. 	"coral" => "FF7F50",
  23. 	"darkorange" => "FF8C00",
  24. 	"orange" => "FFA500",
  25. 	"gold" => "FFD700",
  26. 	"yellow" => "FFFF00",
  27. 	"lightyellow" => "FFFFE0",
  28. 	"lemonchiffon" => "FFFACD",
  29. 	"lightgoldenrodyellow" => "FAFAD2",
  30. 	"papayawhip" => "FFEFD5",
  31. 	"moccasin" => "FFE4B5",
  32. 	"peachpuff" => "FFDAB9",
  33. 	"palegoldenrod" => "EEE8AA",
  34. 	"khaki" => "F0E68C",
  35. 	"darkkhaki" => "BDB76B",
  36. 	"cornsilk" => "FFF8DC",
  37. 	"blanchedalmond" => "FFEBCD",
  38. 	"bisque" => "FFE4C4",
  39. 	"navajowhite" => "FFDEAD",
  40. 	"wheat" => "F5DEB3",
  41. 	"burlywood" => "DEB887",
  42. 	"tan" => "D2B48C",
  43. 	"rosybrown" => "BC8F8F",
  44. 	"sandybrown" => "F4A460",
  45. 	"goldenrod" => "DAA520",
  46. 	"darkgoldenrod" => "B8860B",
  47. 	"peru" => "CD853F",
  48. 	"chocolate" => "D2691E",
  49. 	"saddlebrown" => "8B4513",
  50. 	"sienna" => "A0522D",
  51. 	"brown" => "A52A2A",
  52. 	"maroon" => "800000",
  53. 	"darkolivegreen" => "556B2F",
  54. 	"olive" => "808000",
  55. 	"olivedrab" => "6B8E23",
  56. 	"yellowgreen" => "9ACD32",
  57. 	"limegreen" => "32CD32",
  58. 	"lime" => "00FF00",
  59. 	"lawngreen" => "7CFC00",
  60. 	"chartreuse" => "7FFF00",
  61. 	"greenyellow" => "ADFF2F",
  62. 	"springgreen" => "00FF7F",
  63. 	"mediumspringgreen" => "00FA9A",
  64. 	"lightgreen" => "90EE90",
  65. 	"palegreen" => "98FB98",
  66. 	"darkseagreen" => "8FBC8F",
  67. 	"mediumseagreen" => "3CB371",
  68. 	"seagreen" => "2E8B57",
  69. 	"forestgreen" => "228B22",
  70. 	"green" => "008000",
  71. 	"darkgreen" => "006400",
  72. 	"mediumaquamarine" => "66CDAA",
  73. 	"aqua" => "00FFFF",
  74. 	"cyan" => "00FFFF",
  75. 	"lightcyan" => "E0FFFF",
  76. 	"paleturquoise" => "AFEEEE",
  77. 	"aquamarine" => "7FFFD4",
  78. 	"turquoise" => "40E0D0",
  79. 	"mediumturquoise" => "48D1CC",
  80. 	"darkturquoise" => "00CED1",
  81. 	"lightseagreen" => "20B2AA",
  82. 	"cadetblue" => "5F9EA0",
  83. 	"darkcyan" => "008B8B",
  84. 	"teal" => "008080",
  85. 	"lightsteelblue" => "B0C4DE",
  86. 	"powderblue" => "B0E0E6",
  87. 	"lightblue" => "ADD8E6",
  88. 	"skyblue" => "87CEEB",
  89. 	"lightskyblue" => "87CEFA",
  90. 	"deepskyblue" => "00BFFF",
  91. 	"dodgerblue" => "1E90FF",
  92. 	"cornflowerblue" => "6495ED",
  93. 	"steelblue" => "4682B4",
  94. 	"royalblue" => "4169E1",
  95. 	"blue" => "0000FF",
  96. 	"mediumblue" => "0000CD",
  97. 	"darkblue" => "00008B",
  98. 	"navy" => "000080",
  99. 	"midnightblue" => "191970",
  100. 	"lavender" => "E6E6FA",
  101. 	"thistle" => "D8BFD8",
  102. 	"plum" => "DDA0DD",
  103. 	"violet" => "EE82EE",
  104. 	"orchid" => "DA70D6",
  105. 	"fuchsia" => "FF00FF",
  106. 	"magenta" => "FF00FF",
  107. 	"mediumorchid" => "BA55D3",
  108. 	"mediumpurple" => "9370DB",
  109. 	"blueviolet" => "8A2BE2",
  110. 	"darkviolet" => "9400D3",
  111. 	"darkorchid" => "9932CC",
  112. 	"darkmagenta" => "8B008B",
  113. 	"purple" => "800080",
  114. 	"indigo" => "4B0082",
  115. 	"darkslateblue" => "483D8B",
  116. 	"slateblue" => "6A5ACD",
  117. 	"mediumslateblue" => "7B68EE",
  118. 	"white" => "FFFFFF",
  119. 	"snow" => "FFFAFA",
  120. 	"poop" => "825D1E",
  121. 	"okok" => "825D1E",
  122. 	"honeydew" => "F0FFF0",
  123. 	"mintcream" => "F5FFFA",
  124. 	"azure" => "F0FFFF",
  125. 	"aliceblue" => "F0F8FF",
  126. 	"ghostwhite" => "F8F8FF",
  127. 	"whitesmoke" => "F5F5F5",
  128. 	"seashell" => "FFF5EE",
  129. 	"beige" => "F5F5DC",
  130. 	"oldlace" => "FDF5E6",
  131. 	"floralwhite" => "FFFAF0",
  132. 	"ivory" => "FFFFF0",
  133. 	"antiquewhite" => "FAEBD7",
  134. 	"linen" => "FAF0E6",
  135. 	"lavenderblush" => "FFF0F5",
  136. 	"mistyrose" => "FFE4E1",
  137. 	"gainsboro" => "DCDCDC",
  138. 	"lightgray" => "D3D3D3",
  139. 	"lightgrey" => "D3D3D3",
  140. 	"silver" => "C0C0C0",
  141. 	"darkgray" => "A9A9A9",
  142. 	"darkgrey" => "A9A9A9",
  143. 	"gray" => "808080",
  144. 	"grey" => "808080",
  145. 	"dimgray" => "696969",
  146. 	"dimgrey" => "696969",
  147. 	"lightslategray" => "778899",
  148. 	"lightslategrey" => "778899",
  149. 	"slategray" => "708090",
  150. 	"slategrey" => "708090",
  151. 	"darkslategray" => "2F4F4F",
  152. 	"darkslategrey" => "2F4F4F",
  153. 	"black" => "000000",
  154. 	"roygbiv" => "red,orange,yellow,green,blue,indigo,violet"
  155. );
  156.  
  157.  
  158. function rgbFromHex($hexValue)
  159. {
  160. 	if (strlen($hexValue) == 3) { //shorthand check
  161. 		$r = hexdec(str_repeat($hexValue[0], 2));
  162. 		$g = hexdec(str_repeat($hexValue[1], 2));
  163. 		$b = hexdec(str_repeat($hexValue[2], 2));
  164. 	}
  165. 	else if (strlen($hexValue) == 6){ //standard hex color
  166. 		$r = hexdec(substr($hexValue, 0, 2));
  167. 		$g = hexdec(substr($hexValue, 2, 2));
  168. 		$b = hexdec(substr($hexValue, 4, 2));
  169. 	}
  170. 	else{
  171. 		$r = 0;
  172. 		$g = 0;
  173. 		$b = 0;
  174. 	}
  175.  
  176. 	$rgb = array(
  177. 		$r,
  178. 		$g,
  179. 		$b
  180. 	);
  181. 	return $rgb;
  182. }
  183.  
  184. function getHexByName($name)
  185. {
  186. 	global $colornames;
  187. 	if (isset($colornames[$name])) {
  188. 		return $colornames[$name];
  189. 	}
  190. 	else {
  191. 		return null;
  192. 	}
  193. }
  194.  
  195. /*
  196.  * $input - a string, possibly comma-separated list of HexValues and/or color names
  197.  *
  198.  * returns an array of [r, g, b] arrays
  199.  */
  200. function parseColors($input){
  201. 	$colorArray = array();
  202. 	$parts = explode(",", $input);
  203.  
  204. 	foreach($parts as $color){
  205. 		$byName = getHexByName($color);
  206. 		if(!isset($byName)){
  207. 			array_push($colorArray, rgbFromHex($color));
  208. 		} else{
  209. 			if (strpos($byName, ",") !== FALSE){
  210. 				// we're dealing with a multi-part name, eg: roygbiv
  211. 				foreach(parseColors($byName) as $col){
  212. 					array_push($colorArray, $col);
  213. 				}
  214. 			} else{
  215. 				array_push($colorArray, rgbFromHex($byName));
  216. 			}
  217. 		}
  218. 	}
  219.  
  220. 	return $colorArray;
  221. }
  222.  
  223. /* 
  224.  * $colorArray - an array of [r, g, b] arrays. 
  225.  *
  226.  * returns an array of [r, g, b] arrays. 
  227.  */
  228. function interpolateGradient($colorArray){
  229. 	$output = array();
  230. 	$arrLen = count($colorArray);
  231. 	$gradWidth = 200 / $arrLen;
  232.  
  233.  
  234. 	for($index = 0;$index < $arrLen - 1; $index++){
  235. 		$curr = $colorArray[$index];
  236. 		$next = $colorArray[$index+1];
  237.  
  238. 		for($step = 0; $step < $gradWidth; $step++){
  239. 			array_push($output, array(
  240. 				$curr[0] + $step / $gradWidth * ($next[0] - $curr[0]),
  241. 				$curr[1] + $step / $gradWidth * ($next[1] - $curr[1]),
  242. 				$curr[2] + $step / $gradWidth * ($next[2] - $curr[2])
  243. 			));
  244. 		}
  245. 	}
  246.  
  247.  
  248. 	return $output;
  249. }
  250.  
  251. /* 
  252.  * $colorArray - an array of [r, g, b] arrays. 
  253.  *
  254.  * returns an image. 
  255.  */
  256. function createSwatch($colorArray)
  257. {
  258. 	$img = imagecreate(200, 40);
  259. 	$colWidth = 200 / count($colorArray);
  260. 	$x = 0;
  261. 	foreach($colorArray as $rgb) {
  262. 		$color = imagecolorallocate($img, $rgb[0], $rgb[1], $rgb[2]);
  263. 		imagefilledrectangle($img, $x, 0, $x + $colWidth, 40, $color);
  264. 		$x += $colWidth;
  265. 	}
  266. 	return imagepng($img);
  267. }
  268.  
  269. /*
  270. $colors = $_GET['color'];
  271. $gradient = $_GET['gradient'];
  272.  
  273. if (isset($colors)) {
  274. 	$colorArray = parseColors(strtolower($colors));
  275. } else if (isset($gradient)){
  276. 	$colorArray = interpolateGradient(parseColors(strtolower($gradient)));
  277. }
  278.  
  279. if (isset($colorArray)){
  280. 	createSwatch($colorArray);
  281. }
  282. */
  283.  
  284. createSwatch(interpolateGradient(parseColors("aqua,poop,roygbiv,poop,aqua")));
  285.  
  286. ?>
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https://ideone.com/1M0Woz
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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