generate('hello'); * header('Content-type: image/png'); * echo $data; * exit; */ class vizhash16x16 { /** * hash values * * @access private * @var array */ private $VALUES; /** * index of current value * * @access private * @var int */ private $VALUES_INDEX; /** * image width * * @access private * @var int */ private $width; /** * image height * * @access private * @var int */ private $height; /** * salt used when generating the image * * @access private * @var string */ private $salt; /** * constructor * * @access public * @return void */ public function __construct() { $this->width = 16; $this->height = 16; $this->salt = serversalt::get(); } /** * Generate a 16x16 png corresponding to $text. * * @access public * @param string $text * @return string PNG data. Or empty string if GD is not available. */ public function generate($text) { if (!function_exists('gd_info')) { return ''; } // We hash the input string. $hash=hash('sha1', $text.$this->salt).hash('md5', $text.$this->salt); $hash=$hash.strrev($hash); # more data to make graphics $hashlen=strlen($hash); // We convert the hash into an array of integers. $this->VALUES=array(); for ($i=0; $i<$hashlen; $i=$i+2) { array_push($this->VALUES, hexdec(substr($hash, $i, 2))); } $this->VALUES_INDEX=0; // to walk the array. // Then use these integers to drive the creation of an image. $image = imagecreatetruecolor($this->width, $this->height); $r0 = $this->getInt(); $r=$r0; $g0 = $this->getInt(); $g=$g0; $b0 = $this->getInt(); $b=$b0; // First, create an image with a specific gradient background. $op='v'; if (($this->getInt()%2)==0) { $op='h'; }; $image = $this->degrade($image, $op, array($r0, $g0, $b0), array(0, 0, 0)); for ($i=0; $i<7; $i=$i+1) { $action=$this->getInt(); $color = imagecolorallocate($image, $r, $g, $b); $r = ($r0 + $this->getInt()/25)%256; $g = ($g0 + $this->getInt()/25)%256; $b = ($b0 + $this->getInt()/25)%256; $r0=$r; $g0=$g; $b0=$b; $this->drawshape($image, $action, $color); } $color = imagecolorallocate($image, $this->getInt(), $this->getInt(), $this->getInt()); $this->drawshape($image, $this->getInt(), $color); ob_start(); imagepng($image); $imagedata = ob_get_contents(); ob_end_clean(); imagedestroy($image); return $imagedata; } /** * Returns a single integer from the $VALUES array (0...255) * * @access private * @return int */ private function getInt() { $v= $this->VALUES[$this->VALUES_INDEX]; $this->VALUES_INDEX++; $this->VALUES_INDEX %= count($this->VALUES); // Warp around the array return $v; } /** * Returns a single integer from the array (roughly mapped to image width) * * @access private * @return int */ private function getX() { return $this->width*$this->getInt()/256; } /** * Returns a single integer from the array (roughly mapped to image height) * * @access private * @return int */ private function getY() { return $this->height*$this->getInt()/256; } /** * Gradient function * * taken from: * http://www.supportduweb.com/scripts_tutoriaux-code-source-41-gd-faire-un-degrade-en-php-gd-fonction-degrade-imagerie.html * * @access private * @param resource $img * @param string $direction * @param array $color1 * @param array $color2 * @return resource */ private function degrade($img, $direction, $color1, $color2) { if ($direction=='h') { $size = imagesx($img); $sizeinv = imagesy($img); } else { $size = imagesy($img); $sizeinv = imagesx($img); } $diffs = array( (($color2[0]-$color1[0])/$size), (($color2[1]-$color1[1])/$size), (($color2[2]-$color1[2])/$size) ); for ($i=0;$i<$size;$i++) { $r = $color1[0]+($diffs[0]*$i); $g = $color1[1]+($diffs[1]*$i); $b = $color1[2]+($diffs[2]*$i); if ($direction=='h') { imageline($img, $i, 0, $i, $sizeinv, imagecolorallocate($img, $r, $g, $b)); } else { imageline($img, 0, $i, $sizeinv, $i, imagecolorallocate($img, $r, $g, $b)); } } return $img; } /** * Draw a shape * * @access private * @param resource $image * @param int $action * @param int $color * @return void */ private function drawshape($image, $action, $color) { switch ($action%7) { case 0: ImageFilledRectangle($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $color); break; case 1: case 2: ImageFilledEllipse($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $color); break; case 3: $points = array($this->getX(), $this->getY(), $this->getX(), $this->getY(), $this->getX(), $this->getY(),$this->getX(), $this->getY()); ImageFilledPolygon($image, $points, 4, $color); break; default: $start=$this->getInt()*360/256; $end=$start+$this->getInt()*180/256; ImageFilledArc($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $start, $end, $color, IMG_ARC_PIE); } } }