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Jhawins/colors.php

Last active Aug 29, 2015
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<?php
//This script generates a color palette or gradient based on [hexadecimal, short-hex, rgb, color name] values sent through _GET['color'] or _GET['gradient]
$colors = $_GET['color'];
$gradient = $_GET['gradient'];
if (isset($colors)) { //added these to avoid sending a blank page with image headers.
header('Content-Type: image/png');
$type = 'color';
} else if (isset($gradient)) {
header('Content-Type: image/png');
$type = 'gradient';
}
$colornames = array(
"pink" => "FFC0CB",
"lightpink" => "FFB6C1",
"hotpink" => "FF69B4",
"deeppink" => "FF1493",
"palevioletred" => "DB7093",
"mediumvioletred" => "C71585",
"lightsalmon" => "FFA07A",
"salmon" => "FA8072",
"darksalmon" => "E9967A",
"lightcoral" => "F08080",
"indianred" => "CD5C5C",
"crimson" => "DC143C",
"firebrick" => "B22222",
"darkred" => "8B0000",
"red" => "FF0000",
"orangered" => "FF4500",
"tomato" => "FF6347",
"coral" => "FF7F50",
"darkorange" => "FF8C00",
"orange" => "FFA500",
"gold" => "FFD700",
"yellow" => "FFFF00",
"lightyellow" => "FFFFE0",
"lemonchiffon" => "FFFACD",
"lightgoldenrodyellow" => "FAFAD2",
"papayawhip" => "FFEFD5",
"moccasin" => "FFE4B5",
"peachpuff" => "FFDAB9",
"palegoldenrod" => "EEE8AA",
"khaki" => "F0E68C",
"darkkhaki" => "BDB76B",
"cornsilk" => "FFF8DC",
"blanchedalmond" => "FFEBCD",
"bisque" => "FFE4C4",
"navajowhite" => "FFDEAD",
"wheat" => "F5DEB3",
"burlywood" => "DEB887",
"tan" => "D2B48C",
"rosybrown" => "BC8F8F",
"sandybrown" => "F4A460",
"goldenrod" => "DAA520",
"darkgoldenrod" => "B8860B",
"peru" => "CD853F",
"chocolate" => "D2691E",
"saddlebrown" => "8B4513",
"sienna" => "A0522D",
"brown" => "A52A2A",
"maroon" => "800000",
"darkolivegreen" => "556B2F",
"olive" => "808000",
"olivedrab" => "6B8E23",
"yellowgreen" => "9ACD32",
"limegreen" => "32CD32",
"lime" => "00FF00",
"lawngreen" => "7CFC00",
"chartreuse" => "7FFF00",
"greenyellow" => "ADFF2F",
"springgreen" => "00FF7F",
"mediumspringgreen" => "00FA9A",
"lightgreen" => "90EE90",
"palegreen" => "98FB98",
"darkseagreen" => "8FBC8F",
"mediumseagreen" => "3CB371",
"seagreen" => "2E8B57",
"forestgreen" => "228B22",
"green" => "008000",
"darkgreen" => "006400",
"mediumaquamarine" => "66CDAA",
"aqua" => "00FFFF",
"cyan" => "00FFFF",
"lightcyan" => "E0FFFF",
"paleturquoise" => "AFEEEE",
"aquamarine" => "7FFFD4",
"turquoise" => "40E0D0",
"mediumturquoise" => "48D1CC",
"darkturquoise" => "00CED1",
"lightseagreen" => "20B2AA",
"cadetblue" => "5F9EA0",
"darkcyan" => "008B8B",
"teal" => "008080",
"lightsteelblue" => "B0C4DE",
"powderblue" => "B0E0E6",
"lightblue" => "ADD8E6",
"skyblue" => "87CEEB",
"lightskyblue" => "87CEFA",
"deepskyblue" => "00BFFF",
"dodgerblue" => "1E90FF",
"cornflowerblue" => "6495ED",
"steelblue" => "4682B4",
"royalblue" => "4169E1",
"blue" => "0000FF",
"mediumblue" => "0000CD",
"darkblue" => "00008B",
"navy" => "000080",
"midnightblue" => "191970",
"lavender" => "E6E6FA",
"thistle" => "D8BFD8",
"plum" => "DDA0DD",
"violet" => "EE82EE",
"orchid" => "DA70D6",
"fuchsia" => "FF00FF",
"magenta" => "FF00FF",
"mediumorchid" => "BA55D3",
"mediumpurple" => "9370DB",
"blueviolet" => "8A2BE2",
"darkviolet" => "9400D3",
"darkorchid" => "9932CC",
"darkmagenta" => "8B008B",
"purple" => "800080",
"indigo" => "4B0082",
"darkslateblue" => "483D8B",
"slateblue" => "6A5ACD",
"mediumslateblue" => "7B68EE",
"white" => "FFFFFF",
"snow" => "FFFAFA",
"honeydew" => "F0FFF0",
"mintcream" => "F5FFFA",
"azure" => "F0FFFF",
"aliceblue" => "F0F8FF",
"ghostwhite" => "F8F8FF",
"whitesmoke" => "F5F5F5",
"seashell" => "FFF5EE",
"beige" => "F5F5DC",
"oldlace" => "FDF5E6",
"floralwhite" => "FFFAF0",
"ivory" => "FFFFF0",
"antiquewhite" => "FAEBD7",
"linen" => "FAF0E6",
"lavenderblush" => "FFF0F5",
"mistyrose" => "FFE4E1",
"gainsboro" => "DCDCDC",
"lightgray" => "D3D3D3",
"lightgrey" => "D3D3D3",
"silver" => "C0C0C0",
"darkgray" => "A9A9A9",
"darkgrey" => "A9A9A9",
"gray" => "808080",
"grey" => "808080",
"dimgray" => "696969",
"dimgrey" => "696969",
"lightslategray" => "778899",
"lightslategrey" => "778899",
"slategray" => "708090",
"slategrey" => "708090",
"darkslategray" => "2F4F4F",
"darkslategrey" => "2F4F4F",
"black" => "000000"
);
function rgbFromHex($hexValue)
{
if (strlen($hexValue) == 3) { //shorthand check
$r = hexdec(str_repeat($hexValue[0], 2));
$g = hexdec(str_repeat($hexValue[1], 2));
$b = hexdec(str_repeat($hexValue[2], 2));
} else if (strlen($hexValue) == 6) { //standard hex color
$r = hexdec(substr($hexValue, 0, 2));
$g = hexdec(substr($hexValue, 2, 2));
$b = hexdec(substr($hexValue, 4, 2));
} else {
$r = 0;
$g = 0;
$b = 0;
}
$rgb = array(
$r,
$g,
$b
);
return $rgb;
}
function getHexByName($name)
{
global $colornames;
if (isset($colornames[$name])) {
return $colornames[$name];
} else {
return null;
}
}
/*
* $input - a string, possibly comma-separated list of HexValues and/or color names
*
* returns an array of [r, g, b] arrays
*/
function parseColors($input)
{
$colorArray = array();
$parts = explode(",", $input);
foreach ($parts as $color) {
$byName = getHexByName($color);
if (!isset($byName)) {
array_push($colorArray, rgbFromHex($color));
} else {
if (strpos($byName, ",") !== FALSE) {
// we're dealing with a multi-part name, eg: roygbiv
foreach (parseColors($byName) as $col) {
array_push($colorArray, $col);
}
} else {
array_push($colorArray, rgbFromHex($byName));
}
}
}
return $colorArray;
}
/*
* $colorArray - an array of [r, g, b] arrays.
*
* returns an array of [r, g, b] arrays.
*/
function interpolateGradient($colorArray)
{
$steps = 200;
$arrLen = count($colorArray) - 1;
$stepsPerGrad = $steps / $arrLen;
$output = array();
for ($step = 0; $step < $steps; $step++) {
$index = floor($step / $stepsPerGrad);
$percent = $step / $stepsPerGrad - $index;
$curr = $colorArray[$index];
$next = $colorArray[$index + 1];
array_push($output, array(
$curr[0] + $percent * ($next[0] - $curr[0]),
$curr[1] + $percent * ($next[1] - $curr[1]),
$curr[2] + $percent * ($next[2] - $curr[2])
));
}
return $output;
}
/*
* $colorArray - an array of [r, g, b] arrays.
*
* returns an image.
*/
function createSwatch($colorArray)
{
$img = imagecreate(1200, 240);
$colWidth = 1200 / count($colorArray);
$x = 0;
foreach ($colorArray as $rgb) {
$color = imagecolorallocate($img, $rgb[0], $rgb[1], $rgb[2]);
imagefilledrectangle($img, $x, 0, $x + $colWidth, 240, $color);
$x += $colWidth;
}
return imagepng($img);
}
if ($type == 'color') {
$colorArray = parseColors(strtolower($colors));
} else if ($type == 'gradient') {
$colorArray = interpolateGradient(parseColors(strtolower($gradient)));
} else {
echo 'GO AWAY';
}
if (isset($colorArray)) {
createSwatch($colorArray);
}
?>
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