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<?php
/**
* 随机头像生成
* 生成算法来自Github,具体出处找不到了,做了少量修改
* @author loveyu
*/
/**
* 头像HASH值
*/
define("AVATAR_HASH", (isset($_GET['hash']) && !empty($_GET['hash'])) ? md5($_GET['hash']) : md5(rand(0, 1000000)));
/**
* 头像大小
*/
define("AVATAR_SIZE", (isset($_GET['size']) && $_GET['size'] > 10) ? $_GET['size'] : 100);
/**
* generate sprite for corners and sides
* @param $shape
* @param $R
* @param $G
* @param $B
* @param $rotation
* @return resource
*/
function getsprite($shape, $R, $G, $B, $rotation){
global $spriteZ;
$sprite = imagecreatetruecolor($spriteZ, $spriteZ);
imageantialias($sprite, true);
$fg = imagecolorallocate($sprite, $R, $G, $B);
$bg = imagecolorallocate($sprite, 255, 255, 255);
imagefilledrectangle($sprite, 0, 0, $spriteZ, $spriteZ, $bg);
switch($shape){
case 0: // triangle
$shape = array(0.5, 1, 1, 0, 1, 1);
break;
case 1: // parallelogram
$shape = array(0.5, 0, 1, 0, 0.5, 1, 0, 1);
break;
case 2: // mouse ears
$shape = array(0.5, 0, 1, 0, 1, 1, 0.5, 1, 1, 0.5);
break;
case 3: // ribbon
$shape = array(0, 0.5, 0.5, 0, 1, 0.5, 0.5, 1, 0.5, 0.5);
break;
case 4: // sails
$shape = array(0, 0.5, 1, 0, 1, 1, 0, 1, 1, 0.5);
break;
case 5: // fins
$shape = array(1, 0, 1, 1, 0.5, 1, 1, 0.5, 0.5, 0.5);
break;
case 6: // beak
$shape = array(0, 0, 1, 0, 1, 0.5, 0, 0, 0.5, 1, 0, 1);
break;
case 7: // chevron
$shape = array(0, 0, 0.5, 0, 1, 0.5, 0.5, 1, 0, 1, 0.5, 0.5);
break;
case 8: // fish
$shape = array(0.5, 0, 0.5, 0.5, 1, 0.5, 1, 1, 0.5, 1, 0.5, 0.5, 0, 0.5);
break;
case 9: // kite
$shape = array(0, 0, 1, 0, 0.5, 0.5, 1, 0.5, 0.5, 1, 0.5, 0.5, 0, 1);
break;
case 10: // trough
$shape = array(0, 0.5, 0.5, 1, 1, 0.5, 0.5, 0, 1, 0, 1, 1, 0, 1);
break;
case 11: // rays
$shape = array(0.5, 0, 1, 0, 1, 1, 0.5, 1, 1, 0.75, 0.5, 0.5, 1, 0.25);
break;
case 12: // double rhombus
$shape = array(0, 0.5, 0.5, 0, 0.5, 0.5, 1, 0, 1, 0.5, 0.5, 1, 0.5, 0.5, 0, 1);
break;
case 13: // crown
$shape = array(0, 0, 1, 0, 1, 1, 0, 1, 1, 0.5, 0.5, 0.25, 0.5, 0.75, 0, 0.5, 0.5, 0.25);
break;
case 14: // radioactive
$shape = array(0, 0.5, 0.5, 0.5, 0.5, 0, 1, 0, 0.5, 0.5, 1, 0.5, 0.5, 1, 0.5, 0.5, 0, 1);
break;
default: // tiles
$shape = array(0, 0, 1, 0, 0.5, 0.5, 0.5, 0, 0, 0.5, 1, 0.5, 0.5, 1, 0.5, 0.5, 0, 1);
break;
}
/* apply ratios */
for($i = 0; $i < count($shape); $i++){
$shape[$i] = $shape[$i] * $spriteZ;
}
imagefilledpolygon($sprite, $shape, count($shape) / 2, $fg);
/* rotate the sprite */
for($i = 0; $i < $rotation; $i++){
$sprite = imagerotate($sprite, 90, $bg);
}
return $sprite;
}
/**
* generate sprite for center block
* @param $shape
* @param $fR
* @param $fG
* @param $fB
* @param $bR
* @param $bG
* @param $bB
* @param $usebg
* @return resource
*/
function getcenter($shape, $fR, $fG, $fB, $bR, $bG, $bB, $usebg){
global $spriteZ;
$sprite = imagecreatetruecolor($spriteZ, $spriteZ);
imageantialias($sprite, true);
$fg = imagecolorallocate($sprite, $fR, $fG, $fB);
/* make sure there's enough contrast before we use background color of side sprite */
if($usebg > 0 && (abs($fR - $bR) > 127 || abs($fG - $bG) > 127 || abs($fB - $bB) > 127)){
$bg = imagecolorallocate($sprite, $bR, $bG, $bB);
} else{
$bg = imagecolorallocate($sprite, 255, 255, 255);
}
imagefilledrectangle($sprite, 0, 0, $spriteZ, $spriteZ, $bg);
switch($shape){
case 0: // empty
$shape = array();
break;
case 1: // fill
$shape = array(0, 0, 1, 0, 1, 1, 0, 1);
break;
case 2: // diamond
$shape = array(0.5, 0, 1, 0.5, 0.5, 1, 0, 0.5);
break;
case 3: // reverse diamond
$shape = array(0, 0, 1, 0, 1, 1, 0, 1, 0, 0.5, 0.5, 1, 1, 0.5, 0.5, 0, 0, 0.5);
break;
case 4: // cross
$shape = array(0.25, 0, 0.75, 0, 0.5, 0.5, 1, 0.25, 1, 0.75, 0.5, 0.5, 0.75, 1, 0.25, 1, 0.5, 0.5, 0, 0.75, 0, 0.25, 0.5, 0.5);
break;
case 5: // morning star
$shape = array(0, 0, 0.5, 0.25, 1, 0, 0.75, 0.5, 1, 1, 0.5, 0.75, 0, 1, 0.25, 0.5);
break;
case 6: // small square
$shape = array(0.33, 0.33, 0.67, 0.33, 0.67, 0.67, 0.33, 0.67);
break;
case 7: // checkerboard
$shape = array(0, 0, 0.33, 0, 0.33, 0.33, 0.66, 0.33, 0.67, 0, 1, 0, 1, 0.33, 0.67, 0.33, 0.67, 0.67, 1, 0.67, 1, 1, 0.67, 1, 0.67, 0.67,
0.33, 0.67, 0.33, 1, 0, 1, 0, 0.67, 0.33, 0.67, 0.33, 0.33, 0, 0.33);
break;
}
/* apply ratios */
for($i = 0; $i < count($shape); $i++){
$shape[$i] = $shape[$i] * $spriteZ;
}
if(count($shape) > 0){
imagefilledpolygon($sprite, $shape, count($shape) / 2, $fg);
}
return $sprite;
}
/**
* 调整颜色
* @param $r
* @param $g
* @param $b
*/
function fix_rgb(&$r, &$g, &$b){
if($r==0){
$r = 10;
}
if($g==0){
$g = 10;
}
if($b ==0){
$b = 10;
}
while($r < 210){
$r *= 1.3;
}
while($g < 100){
$g *= 1.3;
}
while($b < 180){
$b *= 1.3;
}
if($r > 255){
$r = 511 - $r;
}
if($g > 255){
$g = 511 - $g;
}
if($b > 255){
$b = 511 - $b;
}
}
$csh = hexdec(substr(AVATAR_HASH, 0, 1)); // corner sprite shape
$ssh = hexdec(substr(AVATAR_HASH, 1, 1)); // side sprite shape
$xsh = hexdec(substr(AVATAR_HASH, 2, 1)) & 7; // center sprite shape
$cro = hexdec(substr(AVATAR_HASH, 3, 1)) & 3; // corner sprite rotation
$sro = hexdec(substr(AVATAR_HASH, 4, 1)) & 3; // side sprite rotation
$xbg = hexdec(substr(AVATAR_HASH, 5, 1)) % 2; // center sprite background
/* corner sprite foreground color */
$cfr = hexdec(substr(AVATAR_HASH, 6, 2));
$cfg = hexdec(substr(AVATAR_HASH, 8, 2));
$cfb = hexdec(substr(AVATAR_HASH, 10, 2));
fix_rgb($cfr, $cfg, $cfb);
/* side sprite foreground color */
$sfr = hexdec(substr(AVATAR_HASH, 12, 2));
$sfg = hexdec(substr(AVATAR_HASH, 14, 2));
$sfb = hexdec(substr(AVATAR_HASH, 16, 2));
fix_rgb($sfr, $sfg, $sfb);
/* final angle of rotation */
$angle = hexdec(substr(AVATAR_HASH, 18, 2));
/* size of each sprite */
$spriteZ = 128;
/* start with blank 3x3 identicon */
$identicon = imagecreatetruecolor($spriteZ * 3, $spriteZ * 3);
imageantialias($identicon, true);
/* assign white as background */
$bg = imagecolorallocate($identicon, 255, 255, 255);
imagefilledrectangle($identicon, 0, 0, $spriteZ, $spriteZ, $bg);
/* generate corner sprites */
$corner = getsprite($csh, $cfr, $cfg, $cfb, $cro);
imagecopy($identicon, $corner, 0, 0, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, 0, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, $spriteZ * 2, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$corner = imagerotate($corner, 90, $bg);
imagecopy($identicon, $corner, $spriteZ * 2, 0, 0, 0, $spriteZ, $spriteZ);
/* generate side sprites */
$side = getsprite($ssh, $sfr, $sfg, $sfb, $sro);
imagecopy($identicon, $side, $spriteZ, 0, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, 0, $spriteZ, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, $spriteZ, $spriteZ * 2, 0, 0, $spriteZ, $spriteZ);
$side = imagerotate($side, 90, $bg);
imagecopy($identicon, $side, $spriteZ * 2, $spriteZ, 0, 0, $spriteZ, $spriteZ);
/* generate center sprite */
$center = getcenter($xsh, $cfr, $cfg, $cfb, $sfr, $sfg, $sfb, $xbg);
imagecopy($identicon, $center, $spriteZ, $spriteZ, 0, 0, $spriteZ, $spriteZ);
// $identicon=imagerotate($identicon,$angle,$bg);
/* make white transparent */
imagecolortransparent($identicon, $bg);
/* create blank image according to specified dimensions */
$resized = imagecreatetruecolor(AVATAR_SIZE, AVATAR_SIZE);
imageantialias($resized, true);
/* assign white as background */
$bg = imagecolorallocate($resized, 255, 255, 255);
imagefilledrectangle($resized, 0, 0, AVATAR_SIZE, AVATAR_SIZE, $bg);
/* resize identicon according to specification */
imagecopyresampled($resized, $identicon, 0, 0, (imagesx($identicon) - $spriteZ * 3) / 2, (imagesx($identicon) - $spriteZ * 3) / 2, AVATAR_SIZE, AVATAR_SIZE, $spriteZ * 3, $spriteZ * 3);
/* make white transparent */
imagecolortransparent($resized, $bg);
/* and finally, send to standard output */
header("Content-Type: image/png");
imagepng($resized);
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