generate('hello'); * header('Content-type: image/png'); * echo $data; * exit; */ class vizhash16x16 { private $VALUES; private $VALUES_INDEX; private $width; private $height; private $salt; function __construct() { $this->width=16; $this->height=16; $this->salt = serversalt::get(); } // Generate a 16x16 png corresponding to $text. // Input: $text (string) // Output: PNG data. Or empty string if GD is not available. function generate($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 // We convert the hash into an array of integers. $this->VALUES=array(); for($i=0; $iVALUES,hexdec(substr($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; } // Generate a large random hexadecimal salt. private function randomSalt() { $randomSalt=''; for($i=0;$i<6;$i++) { $randomSalt.=base_convert(mt_rand(),10,16); } return $randomSalt; } private function getInt() // Returns a single integer from the $VALUES array (0...255) { $v= $this->VALUES[$this->VALUES_INDEX]; $this->VALUES_INDEX++; $this->VALUES_INDEX %= count($this->VALUES); // Warp around the array return $v; } private function getX() // Returns a single integer from the array (roughly mapped to image width) { return $this->width*$this->getInt()/256; } private function getY() // Returns a single integer from the array (roughly mapped to image height) { 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 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 $img; } private function drawshape($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; case 4: case 5: case 6: $start=$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); break; } } } ?>