232 lines
6.3 KiB
PHP
232 lines
6.3 KiB
PHP
<?php
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/**
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* VizHash_GD
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*
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* Visual Hash implementation in php4+GD,
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* stripped down and modified version for ZeroBin
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*
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* @link http://sebsauvage.net/wiki/doku.php?id=php:vizhash_gd
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.0.4 beta ZeroBin 0.20
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*/
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/**
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* vizhash16x16
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*
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* Example:
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* $vz = new vizhash16x16();
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* $data = $vz->generate('hello');
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* header('Content-type: image/png');
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* echo $data;
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* exit;
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*/
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class vizhash16x16
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{
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/**
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* hash values
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*
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* @access private
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* @var array
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*/
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private $VALUES;
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/**
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* index of current value
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*
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* @access private
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* @var int
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*/
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private $VALUES_INDEX;
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/**
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* image width
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*
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* @access private
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* @var int
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*/
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private $width;
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/**
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* image height
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*
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* @access private
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* @var int
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*/
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private $height;
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/**
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* salt used when generating the image
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*
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* @access private
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* @var string
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*/
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private $salt;
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/**
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* constructor
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*
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* @access public
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* @return void
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*/
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public function __construct()
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{
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$this->width = 16;
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$this->height = 16;
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$this->salt = serversalt::get();
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}
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/**
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* Generate a 16x16 png corresponding to $text.
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*
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* @access public
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* @param string $text
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* @return string PNG data. Or empty string if GD is not available.
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*/
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public function generate($text)
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{
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if (!function_exists('gd_info')) return '';
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// We hash the input string.
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$hash=hash('sha1',$text.$this->salt).hash('md5',$text.$this->salt);
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$hash=$hash.strrev($hash); # more data to make graphics
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// We convert the hash into an array of integers.
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$this->VALUES=array();
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for($i=0; $i<strlen($hash); $i=$i+2){ array_push($this->VALUES,hexdec(substr($hash,$i,2))); }
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$this->VALUES_INDEX=0; // to walk the array.
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// Then use these integers to drive the creation of an image.
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$image = imagecreatetruecolor($this->width,$this->height);
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$r0 = $this->getInt();$r=$r0;
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$g0 = $this->getInt();$g=$g0;
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$b0 = $this->getInt();$b=$b0;
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// First, create an image with a specific gradient background.
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$op='v'; if (($this->getInt()%2)==0) { $op='h'; };
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$image = $this->degrade($image,$op,array($r0,$g0,$b0),array(0,0,0));
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for($i=0; $i<7; $i=$i+1)
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{
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$action=$this->getInt();
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$color = imagecolorallocate($image, $r,$g,$b);
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$r = ($r0 + $this->getInt()/25)%256;
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$g = ($g0 + $this->getInt()/25)%256;
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$b = ($b0 + $this->getInt()/25)%256;
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$r0=$r; $g0=$g; $b0=$b;
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$this->drawshape($image,$action,$color);
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}
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$color = imagecolorallocate($image,$this->getInt(),$this->getInt(),$this->getInt());
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$this->drawshape($image,$this->getInt(),$color);
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ob_start();
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imagepng($image);
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$imagedata = ob_get_contents();
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ob_end_clean();
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imagedestroy($image);
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return $imagedata;
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}
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/**
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* Returns a single integer from the $VALUES array (0...255)
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*
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* @access private
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* @return int
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*/
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private function getInt()
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{
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$v= $this->VALUES[$this->VALUES_INDEX];
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$this->VALUES_INDEX++;
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$this->VALUES_INDEX %= count($this->VALUES); // Warp around the array
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return $v;
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}
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/**
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* Returns a single integer from the array (roughly mapped to image width)
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*
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* @access private
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* @return int
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*/
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private function getX()
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{
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return $this->width*$this->getInt()/256;
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}
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/**
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* Returns a single integer from the array (roughly mapped to image height)
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*
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* @access private
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* @return int
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*/
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private function getY()
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{
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return $this->height*$this->getInt()/256;
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}
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/**
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* Gradient function
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*
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* taken from:
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* http://www.supportduweb.com/scripts_tutoriaux-code-source-41-gd-faire-un-degrade-en-php-gd-fonction-degrade-imagerie.html
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*
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* @access private
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* @param resource $img
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* @param string $direction
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* @param array $color1
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* @param array $color2
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* @return resource
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*/
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private function degrade($img,$direction,$color1,$color2)
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{
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if($direction=='h') { $size = imagesx($img); $sizeinv = imagesy($img); }
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else { $size = imagesy($img); $sizeinv = imagesx($img);}
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$diffs = array(
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(($color2[0]-$color1[0])/$size),
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(($color2[1]-$color1[1])/$size),
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(($color2[2]-$color1[2])/$size)
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);
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for($i=0;$i<$size;$i++)
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{
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$r = $color1[0]+($diffs[0]*$i);
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$g = $color1[1]+($diffs[1]*$i);
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$b = $color1[2]+($diffs[2]*$i);
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if($direction=='h') { imageline($img,$i,0,$i,$sizeinv,imagecolorallocate($img,$r,$g,$b)); }
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else { imageline($img,0,$i,$sizeinv,$i,imagecolorallocate($img,$r,$g,$b)); }
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}
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return $img;
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}
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/**
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* Draw a shape
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*
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* @access private
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* @param resource $image
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* @param int $action
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* @param int $color
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* @return void
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*/
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private function drawshape($image,$action,$color)
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{
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switch($action%7)
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{
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case 0:
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ImageFilledRectangle ($image,$this->getX(),$this->getY(),$this->getX(),$this->getY(),$color);
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break;
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case 1:
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case 2:
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ImageFilledEllipse ($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(), $color);
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break;
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case 3:
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$points = array($this->getX(), $this->getY(), $this->getX(), $this->getY(), $this->getX(), $this->getY(),$this->getX(), $this->getY());
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ImageFilledPolygon ($image, $points, 4, $color);
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break;
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default:
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$start=$this->getInt()*360/256; $end=$start+$this->getInt()*180/256;
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ImageFilledArc ($image, $this->getX(), $this->getY(), $this->getX(), $this->getY(),$start,$end,$color,IMG_ARC_PIE);
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}
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}
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}
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