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<?php
/*
Plugin Name: WP_Identicon
Version: 1.02
Plugin URI: http://scott.sherrillmix.com/blog/blogger/wp_identicon/
Description: This plugin generates persistent specific geometric icons for each user based on the ideas of Don Park.
Author: Scott Sherrill-Mix
Author URI: http://scott.sherrillmix.com/blog/
Author non WP port: thomas{AT}thomasfischer{DOT}biz
*/
function identicon_get_options(){
    //Set Default Values Here
    //$default_array=array('size'=>35,'backr'=>array(255,255),'backg'=>array(255,255),'backb'=>array(255,255), 'forer'=>array(1,255),'foreg'=>array(1,255),'foreb'=>array(1,255),'squares'=>4,'autoadd'=>1,'gravatar'=>0,'grey'=>0);
    $default_array=array(
    'size'=>300,
    'backr'=>array(225,255),
    'backg'=>array(225,255),
    'backb'=>array(225,255),
    'forer'=>array(1,205),
    'foreg'=>array(1,205),
    'foreb'=>array(1,205),
    'squares'=>5,
    'autoadd'=>0,
    'gravatar'=>0,
    'grey'=>0);
    return($default_array);
}

class identicon {
    var $identicon_options;
    var $blocks;
    var $shapes;
    var $rotatable;
    var $square;
    var $im;
    var $colors;
    var $size;
    var $blocksize;
    var $quarter;
    var $half;
    var $diagonal;
    var $halfdiag;
    var $transparent=false;
    var $centers;
    var $shapes_mat;
    var $symmetric_num;
    var $rot_mat;
    var $invert_mat;
    var $rotations;

    //constructor
    function identicon($blocks='') {
        $this->identicon_options=identicon_get_options();
        if ($blocks) $this->blocks=$blocks;
        else $this->blocks=$this->identicon_options['squares'];
        $this->blocksize=80;
        $this->size=$this->blocks*$this->blocksize;
        $this->quarter=$this->blocksize/4;
        $this->half=$this->blocksize/2;
        $this->diagonal=sqrt($this->half*$this->half+$this->half*$this->half);
        $this->halfdiag=$this->diagonal/2;
        $this->shapes=array(
            array(array(array(90,$this->half),array(135,$this->diagonal),array(225,$this->diagonal),array(270,$this->half))),//0 rectangular half block
            array(array(array(45,$this->diagonal),array(135,$this->diagonal),array(225,$this->diagonal),array(315,$this->diagonal))),//1 full block
            array(array(array(45,$this->diagonal),array(135,$this->diagonal),array(225,$this->diagonal))),//2 diagonal half block
            array(array(array(90,$this->half),array(225,$this->diagonal),array(315,$this->diagonal))),//3 triangle
            array(array(array(0,$this->half),array(90,$this->half),array(180,$this->half),array(270,$this->half))),//4 diamond
            array(array(array(0,$this->half),array(135,$this->diagonal),array(270,$this->half),array(315,$this->diagonal))),//5 stretched diamond
            array(array(array(0,$this->quarter),array(90,$this->half),array(180,$this->quarter)), array(array(0,$this->quarter),array(315,$this->diagonal),array(270,$this->half)), array(array(270,$this->half),array(180,$this->quarter),array(225,$this->diagonal))),// 6 triple triangle
            array(array(array(0,$this->half),array(135,$this->diagonal),array(270,$this->half))),//7 pointer
            array(array(array(45,$this->halfdiag),array(135,$this->halfdiag),array(225,$this->halfdiag),array(315,$this->halfdiag))),//9 center square
            array(array(array(180,$this->half),array(225,$this->diagonal),array(0,0)), array(array(45,$this->diagonal),array(90,$this->half),array(0,0))),//9 double triangle diagonal
            array(array(array(90,$this->half),array(135,$this->diagonal),array(180,$this->half),array(0,0))),//10 diagonal square
            array(array(array(0,$this->half),array(180,$this->half),array(270,$this->half))),//11 quarter triangle out
            array(array(array(315,$this->diagonal),array(225,$this->diagonal),array(0,0))),//12quarter triangle in
            array(array(array(90,$this->half),array(180,$this->half),array(0,0))),//13 eighth triangle in
            array(array(array(90,$this->half),array(135,$this->diagonal),array(180,$this->half))),//14 eighth triangle out
            array(array(array(90,$this->half),array(135,$this->diagonal),array(180,$this->half),array(0,0)), array(array(0,$this->half),array(315,$this->diagonal),array(270,$this->half),array(0,0))),//15 double corner square
            array(array(array(315,$this->diagonal),array(225,$this->diagonal),array(0,0)), array(array(45,$this->diagonal),array(135,$this->diagonal),array(0,0))),//16 double quarter triangle in
            array(array(array(90,$this->half),array(135,$this->diagonal),array(225,$this->diagonal))),//17 tall quarter triangle
            array(array(array(90,$this->half),array(135,$this->diagonal),array(225,$this->diagonal)), array(array(45,$this->diagonal),array(90,$this->half),array(270,$this->half))),//18 double tall quarter triangle
            array(array(array(90,$this->half),array(135,$this->diagonal),array(225,$this->diagonal)), array(array(45,$this->diagonal),array(90,$this->half),array(0,0))),//19 tall quarter + eighth triangles
            array(array(array(135,$this->diagonal),array(270,$this->half),array(315,$this->diagonal))),//20 tipped over tall triangle
            array(array(array(180,$this->half),array(225,$this->diagonal),array(0,0)), array(array(45,$this->diagonal),array(90,$this->half),array(0,0)), array(array(0,$this->half),array(0,0),array(270,$this->half))),//21 triple triangle diagonal
            array(array(array(0,$this->quarter),array(315,$this->diagonal),array(270,$this->half)), array(array(270,$this->half),array(180,$this->quarter),array(225,$this->diagonal))),//22 double triangle flat
            array(array(array(0,$this->quarter),array(45,$this->diagonal),array(315,$this->diagonal)), array(array(180,$this->quarter),array(135,$this->diagonal),array(225,$this->diagonal))),//23 opposite 8th triangles
            array(array(array(0,$this->quarter),array(45,$this->diagonal),array(315,$this->diagonal)), array(array(180,$this->quarter),array(135,$this->diagonal),array(225,$this->diagonal)), array(array(180,$this->quarter),array(90,$this->half),array(0,$this->quarter),array(270,$this->half))),//24 opposite 8th triangles + diamond
            array(array(array(0,$this->quarter),array(90,$this->quarter),array(180,$this->quarter),array(270,$this->quarter))),//25 small diamond
            array(array(array(0,$this->quarter),array(45,$this->diagonal),array(315,$this->diagonal)), array(array(180,$this->quarter),array(135,$this->diagonal),array(225,$this->diagonal)), array(array(270,$this->quarter),array(225,$this->diagonal),array(315,$this->diagonal)),array(array(90,$this->quarter),array(135,$this->diagonal),array(45,$this->diagonal))),//26 4 opposite 8th triangles
            array(array(array(315,$this->diagonal),array(225,$this->diagonal),array(0,0)), array(array(0,$this->half),array(90,$this->half),array(180,$this->half))),//27 double quarter triangle parallel
            array(array(array(135,$this->diagonal),array(270,$this->half),array(315,$this->diagonal)), array(array(225,$this->diagonal),array(90,$this->half),array(45,$this->diagonal))),//28 double overlapping tipped over tall triangle
            array(array(array(90,$this->half),array(135,$this->diagonal),array(225,$this->diagonal)), array(array(315,$this->diagonal),array(45,$this->diagonal),array(270,$this->half))),//29 opposite double tall quarter triangle
            array(array(array(0,$this->quarter),array(45,$this->diagonal),array(315,$this->diagonal)), array(array(180,$this->quarter),array(135,$this->diagonal),array(225,$this->diagonal)), array(array(270,$this->quarter),array(225,$this->diagonal),array(315,$this->diagonal)),array(array(90,$this->quarter),array(135,$this->diagonal),array(45,$this->diagonal)),array(array(0,$this->quarter),array(90,$this->quarter),array(180,$this->quarter),array(270,$this->quarter))),//30 4 opposite 8th triangles+tiny diamond
            array(array(array(0,$this->half),array(90,$this->half),array(180,$this->half),array(270,$this->half), array(270,$this->quarter),array(180,$this->quarter),array(90,$this->quarter),array(0,$this->quarter))),//31 diamond C
            array(array(array(0,$this->quarter),array(90,$this->half),array(180,$this->quarter),array(270,$this->half))),//32 narrow diamond
            array(array(array(180,$this->half),array(225,$this->diagonal),array(0,0)), array(array(45,$this->diagonal),array(90,$this->half),array(0,0)), array(array(0,$this->half),array(0,0),array(270,$this->half)), array(array(90,$this->half),array(135,$this->diagonal),array(180,$this->half))),//33 quadruple triangle diagonal
            array(array(array(0,$this->half),array(90,$this->half),array(180,$this->half),array(270,$this->half),array(0,$this->half), array(0,$this->quarter),array(270,$this->quarter),array(180,$this->quarter),array(90,$this->quarter),array(0,$this->quarter))),//34 diamond donut
            array(array(array(90,$this->half),array(45,$this->diagonal),array(0,$this->quarter)), array(array(0,$this->half),array(315,$this->diagonal),array(270,$this->quarter)), array(array(270,$this->half),array(225,$this->diagonal),array(180,$this->quarter))),//35 triple turning triangle
            array(array(array(90,$this->half),array(45,$this->diagonal),array(0,$this->quarter)), array(array(0,$this->half),array(315,$this->diagonal),array(270,$this->quarter))),//36 double turning triangle
            array(array(array(90,$this->half),array(45,$this->diagonal),array(0,$this->quarter)), array(array(270,$this->half),array(225,$this->diagonal),array(180,$this->quarter))),//37 diagonal opposite inward double triangle
            array(array(array(90,$this->half),array(225,$this->diagonal),array(0,0),array(315,$this->diagonal))),//38 star fleet
            array(array(array(90,$this->half),array(225,$this->diagonal),array(0,0),array(315,$this->halfdiag),array(225,$this->halfdiag), array(225,$this->diagonal),array(315,$this->diagonal))),//39 hollow half triangle
            array(array(array(90,$this->half),array(135,$this->diagonal),array(180,$this->half)), array(array(270,$this->half),array(315,$this->diagonal),array(0,$this->half))),//40 double eighth triangle out
            array(array(array(90,$this->half),array(135,$this->diagonal),array(180,$this->half),array(180,$this->quarter)), array(array(270,$this->half),array(315,$this->diagonal),array(0,$this->half),array(0,$this->quarter))),//42 double slanted square
            array(array(array(0,$this->half),array(45,$this->halfdiag), array(0,0),array(315,$this->halfdiag)), array(array(180,$this->half),array(135,$this->halfdiag), array(0,0),array(225,$this->halfdiag))),//43 double diamond
            array(array(array(0,$this->half),array(45,$this->diagonal), array(0,0),array(315,$this->halfdiag)), array(array(180,$this->half),array(135,$this->halfdiag), array(0,0),array(225,$this->diagonal))),//44 double pointer
        );
        $this->rotatable=array(1,4,8,25,26,30,34);
        $this->square=$this->shapes[1][0];
        $this->symmetric_num=ceil($this->blocks*$this->blocks/4);
        for ($i=0;$i<$this->blocks;$i++){
            for ($j=0;$j<$this->blocks;$j++){
                $this->centers[$i][$j]=array($this->half+$this->blocksize*$j,$this->half+$this->blocksize*$i);
                $this->shapes_mat[$this->xy2symmetric($i,$j)]=1;
                $this->rot_mat[$this->xy2symmetric($i,$j)]=0;
                $this->invert_mat[$this->xy2symmetric($i,$j)]=0;
                if (floor(($this->blocks-1)/2-$i)>=0&floor(($this->blocks-1)/2-$j)>=0&($j>=$i|$this->blocks%2==0)){
                    $inversei=$this->blocks-1-$i;
                    $inversej=$this->blocks-1-$j;
                    $symmetrics=array(array($i,$j),array($inversej,$i),array($inversei,$inversej),array($j,$inversei));
                    $fill=array(0,270,180,90);
                    for ($k=0;$k<count($symmetrics);$k++){
                        $this->rotations[$symmetrics[$k][0]][$symmetrics[$k][1]]=$fill[$k];
                    }
                }
            }
        }
    }

    function xy2symmetric($x,$y){
        $index=array(floor(abs(($this->blocks-1)/2-$x)),floor(abs(($this->blocks-1)/2-$y)));
        sort($index);
        $index[1]*=ceil($this->blocks/2);
        $index=array_sum($index);
        return $index;
    }



    //convert array(array(heading1,distance1),array(heading1,distance1)) to array(x1,y1,x2,y2)
    function identicon_calc_x_y($array,$centers,$rotation=0){
        $output=array();
        $centerx=$centers[0];
        $centery=$centers[1];
        while($thispoint=array_pop($array)){
            $y=round($centery+sin(deg2rad($thispoint[0]+$rotation))*$thispoint[1]);
            $x=round($centerx+cos(deg2rad($thispoint[0]+$rotation))*$thispoint[1]);
            array_push($output,$x,$y);
        }
        return $output;
    }

    //draw filled polygon based on an array of (x1,y1,x2,y2,..)
    function identicon_draw_shape($x,$y){
        $index=$this->xy2symmetric($x,$y);
        $shape=$this->shapes[$this->shapes_mat[$index]];
        $invert=$this->invert_mat[$index];
        $rotation=$this->rot_mat[$index];
        $centers=$this->centers[$x][$y];
        $invert2=abs($invert-1);
        $points=$this->identicon_calc_x_y($this->square,$centers,0);
        $num = count($points) / 2;
        imagefilledpolygon($this->im, $points, $num, $this->colors[$invert2]);
        foreach($shape as $subshape){
            $points=$this->identicon_calc_x_y($subshape,$centers,$rotation+$this->rotations[$x][$y]);
            $num = count($points) / 2;
            imagefilledpolygon($this->im, $points, $num,$this->colors[$invert]);
        }
    }

    //use a seed value to determine shape, rotation, and color
    function identicon_set_randomness($seed=""){
        //set seed
        $twister=new identicon_mersenne_twister(hexdec($seed));
        foreach ($this->rot_mat as $key => $value){
            $this->rot_mat[$key]=$twister->rand(0,3)*90;
            $this->invert_mat[$key]=$twister->rand(0,1);
            #&$this->blocks%2
            if ($key==0) $this->shapes_mat[$key]=$this->rotatable[$twister->array_rand($this->rotatable)];
            else $this->shapes_mat[$key]=$twister->array_rand($this->shapes);
        }
        $forecolors=array($twister->rand($this->identicon_options['forer'][0],$this->identicon_options['forer'][1]), $twister->rand($this->identicon_options['foreg'][0],$this->identicon_options['foreg'][1]), $twister->rand($this->identicon_options['foreb'][0],$this->identicon_options['foreb'][1]));
        $this->colors[1]=imagecolorallocate($this->im, $forecolors[0],$forecolors[1],$forecolors[2]);
        if (array_sum($this->identicon_options['backr']) + array_sum($this->identicon_options['backg']) + array_sum($this->identicon_options['backb'])==0) {
            $this->colors[0]=imagecolorallocatealpha($this->im,0,0,0,127);
            $this->transparent=true;
            imagealphablending ($this->im,false);
            imagesavealpha($this->im,true);
        } else {
            $backcolors=array($twister->rand($this->identicon_options['backr'][0],$this->identicon_options['backr'][1]), $twister->rand($this->identicon_options['backg'][0],$this->identicon_options['backg'][1]), $twister->rand($this->identicon_options['backb'][0],$this->identicon_options['backb'][1]));
            $this->colors[0]=imagecolorallocate($this->im, $backcolors[0],$backcolors[1],$backcolors[2]);
        }
        if($this->identicon_options['grey']){
            $this->colors[1]=imagecolorallocate($this->im, $forecolors[0],$forecolors[0],$forecolors[0]);
            if(!$this->transparent) $this->colors[0]=imagecolorallocate($this->im, $backcolors[0],$backcolors[0],$backcolors[0]);
        }
        return true;
    }

    function identicon_build($seed='',$altImgText='',$img=true,$outsize='',$write=true,$random=true,$displaysize='',$gravataron=true){
        $filepath = '/var/www/your/path/ident/';
        //make an identicon and return the filepath or if write=false return picture directly
        if (function_exists("gd_info")){
            // init random seed
            //$id=$seed;
            $id=substr(sha1($seed),0,12);
            $fn=$id.'.png';
            $filename=$filepath.$fn;
            if ($outsize=='') $outsize=$this->identicon_options['size'];
            if($displaysize=='') $displaysize=$outsize;
            //if (!file_exists($filename))
            {
                $this->im = imagecreatetruecolor($this->size,$this->size);
                $this->colors = array(imagecolorallocate($this->im, 255,255,255));
                if ($random) $this->identicon_set_randomness($id);
                else {$this->colors = array(imagecolorallocate($this->im, 255,255,255),imagecolorallocate($this->im, 0,0,0));$this->transparent=false;};
                imagefill($this->im,0,0,$this->colors[0]);
                for ($i=0;$i<$this->blocks;$i++){
                    for ($j=0;$j<$this->blocks;$j++){
                    $this->identicon_draw_shape($i,$j);
                    }
                }

                $out = @imagecreatetruecolor($outsize,$outsize);
                imagesavealpha($out,true);
                imagealphablending($out,false);
                imagecopyresampled($out,$this->im,0,0,0,0,$outsize,$outsize,$this->size,$this->size);
                imagedestroy($this->im);
                if ($write){
                        $wrote=imagepng($out,$filename);
                        if(!$wrote) return false; //something went wrong but don't want to mess up blog layout
                }else{
                    header ("Content-type: image/png");
                    imagepng($out);
                }
                imagedestroy($out);
            }
            $filename=$filename;
            if($this->identicon_options['gravatar']&&$gravataron)
                    $filename = "http://www.gravatar.com/avatar.php?gravatar_id=".md5($seed)."&amp;size=$outsize&amp;default=$filename";
            if ($img){
                $filename='<img class="identicon" src="'.$fn.'" alt="'.str_replace('"',"'",$altImgText).' Identicon Icon" height="'.$displaysize.'" width="'.$displaysize.'" />';
            }
            return $filename;
        } else { //php GD image manipulation is required
            return false; //php GD image isn't installed but don't want to mess up blog layout
        }
    }

    function identicon_display_parts(){
        $this->identicon(1);
        for ($i=0;$i<count($this->shapes);$i++){
            $this->shapes_mat=array($i);
            $this->invert_mat=array(1);
            $output.=$this->identicon_build($seed='example'.$i,$altImgText='',$img=true,$outsize=30,$write=true,$random=false);
            $counter++;
        }
        $this->identicon();
    return $output;
    }
}

//create identicon for later use
global $identicon;
$identicon = new identicon;



class identicon_mersenne_twister{
//Copied from wikipedia pseudocode
//Don't call over 600 times (without recalling the constructor)
// Create a length 624 array to store the state of the generator
 var $MT;
 var $i;
 // Initialise the generator from a seed
 function identicon_mersenne_twister ($seed=123456) {
     $this->MT[0] = $seed;
         $this->i=1;
     for ($i=1;$i<624;$i++) { // loop over each other element
         $this->MT[$i] = $this->mysql_math('(1812433253 * ('.$this->MT[$i-1].' ^ ('.$this->MT[$i-1]." >> 30)) + $i) & 0xffffffff");
     }
         $this->generateNumbers();
 }

    //(some) PHP integers don't have enough bits for Mersenne Twister so use mysql
    function mysql_math($equation){
        $equation='select '.$equation;
        //echo $equation;
        $dblink=mysql_connect("localhost","username","password") or die (mysql_error());
        $res = mysql_query($equation,$dblink) or die (mysql_error());
            $arr=mysql_fetch_array($res);

        mysql_close($dblink) or die (mysql_error());

        //global $wpdb;
        //$query="SELECT ".$equation;
        //$answer=$wpdb->get_var($query);
        //echo $equation;
        //echo $arr[0].'<br/>';

        return $arr[0];//$answer;
    }

 // Generate an array of 624 untempered numbers
 function generateNumbers() {
     for ($i=0;$i<624;$i++) {
         $y = $this->mysql_math('('.$this->MT[$i].' & 0x7fffffff) + ('.$this->MT[($i+1)%624].' & 0xfffffffe)');
                 $even=$this->mysql_math($y.' ^ 0x00000001');
         if ($even) {
             $this->MT[$i] = $this->mysql_math($this->MT[($i + 397) % 624]." ^ ($y >> 1)");
         } else {
             $this->MT[$i] = $this->mysql_math($this->MT[($i + 397) % 624]." ^ ($y >>1) ^ (2567483615)"); // 0x9908b0df
         }
     }
 }

 // Extract a tempered pseudorandom number based on the i-th value
 // generateNumbers() will have to be called again once the array of 624 numbers is exhausted
 function extractNumber() {
     $y = $this->MT[$this->i];
     $y = $this->mysql_math("$y ^ ($y >>11) ^ (($y << 7) & 2636928640) ^ (($y << 15) & 4022730752) ^ ($y >>18)");
         $this->i++;
     return $y/0xffffffff;
 }

    function rand($low,$high){
        $pick=floor($low+($high-$low+1)*$this->extractNumber());
        return ($pick);
    }
    function array_rand($array){
        return($this->rand(0,count($array)-1));
    }
}

echo $identicon->identicon_build($_GET['hash'], '', true, '', true, true);
echo '<br/>';
echo '<br/>';
echo $identicon->identicon_build($_GET['hash'].'1', '', true, '', true, true);
echo '<br/>';
echo '<br/>';
echo $identicon->identicon_build($_GET['hash'].'2', '', true, '', true, true);
echo '<br/>';
echo '<br/>';
?>