diff options
Diffstat (limited to 'platform/www/lib/plugins/farmer/3rdparty/RingIcon.php')
| -rw-r--r-- | platform/www/lib/plugins/farmer/3rdparty/RingIcon.php | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/platform/www/lib/plugins/farmer/3rdparty/RingIcon.php b/platform/www/lib/plugins/farmer/3rdparty/RingIcon.php new file mode 100644 index 0000000..c8dfdbc --- /dev/null +++ b/platform/www/lib/plugins/farmer/3rdparty/RingIcon.php @@ -0,0 +1,186 @@ +<?php + +namespace splitbrain\RingIcon; + +/** + * Class RingIcon + * + * Generates a identicon/visiglyph like image based on concentric rings + * + * @todo add a mono color version + * @author Andreas Gohr <andi@splitbrain.org> + * @license MIT + * @package splitbrain\RingIcon + */ +class RingIcon +{ + + protected $size; + protected $fullsize; + protected $rings; + protected $center; + protected $ringwidth; + protected $seed; + protected $ismono = false; + protected $monocolor = null; + + /** + * RingIcon constructor. + * @param int $size width and height of the resulting image + * @param int $rings number of rings + */ + public function __construct($size, $rings = 3) + { + $this->size = $size; + $this->fullsize = $this->size * 5; + $this->rings = 4; + + $this->center = floor($this->fullsize / 2); + $this->ringwidth = floor($this->fullsize / $rings); + + $this->seed = mt_rand() . time(); + } + + /** + * Generates an ring image + * + * If a seed is given, the image will be based on that seed + * + * @param string $seed initialize the genrator with this string + * @param string $file if given, the image is saved at that path, otherwise is printed to browser + */ + public function createImage($seed = '', $file = '') + { + if (!$seed) { + $seed = mt_rand() . time(); + } + $this->seed = $seed; + + // monochrome wanted? + if($this->ismono) { + $this->monocolor = array( + $this->rand(20,255), + $this->rand(20,255), + $this->rand(20,255) + ); + } else { + $this->monocolor = null; + } + + // create + $image = $this->createTransparentImage($this->fullsize, $this->fullsize); + $arcwidth = $this->fullsize; + for ($i = $this->rings; $i > 0; $i--) { + $this->drawRing($image, $arcwidth); + $arcwidth -= $this->ringwidth; + } + + // resample for antialiasing + $out = $this->createTransparentImage($this->size, $this->size); + imagecopyresampled($out, $image, 0, 0, 0, 0, $this->size, $this->size, $this->fullsize, $this->fullsize); + if ($file) { + imagepng($out, $file); + } else { + header("Content-type: image/png"); + imagepng($out); + } + imagedestroy($out); + imagedestroy($image); + } + + /** + * When set to true a monochrome version is returned + * + * @param bool $ismono + */ + public function setMono($ismono) { + $this->ismono = $ismono; + } + + /** + * Generate number from seed + * + * Each call runs MD5 on the seed again + * + * @param int $min + * @param int $max + * @return int + */ + protected function rand($min, $max) + { + $this->seed = md5($this->seed); + $rand = hexdec(substr($this->seed, 0, 8)); + return ($rand % ($max - $min + 1)) + $min; + } + + /** + * Drawas a single ring + * + * @param resource $image + * @param int $arcwidth outer width of the ring + */ + protected function drawRing($image, $arcwidth) + { + $color = $this->randomColor($image); + $transparency = $this->transparentColor($image); + + $start = $this->rand(20, 360); + $stop = $this->rand(20, 360); + if($stop < $start) list($start, $stop) = array($stop, $start); + + imagefilledarc($image, $this->center, $this->center, $arcwidth, $arcwidth, $stop, $start, $color, IMG_ARC_PIE); + imagefilledellipse($image, $this->center, $this->center, $arcwidth - $this->ringwidth, + $arcwidth - $this->ringwidth, $transparency); + + imagecolordeallocate($image, $color); + imagecolordeallocate($image, $transparency); + } + + /** + * Allocate a transparent color + * + * @param resource $image + * @return int + */ + protected function transparentColor($image) + { + return imagecolorallocatealpha($image, 0, 0, 0, 127); + } + + /** + * Allocate a random color + * + * @param $image + * @return int + */ + protected function randomColor($image) + { + if($this->ismono) { + return imagecolorallocatealpha($image, $this->monocolor[0], $this->monocolor[1], $this->monocolor[2], $this->rand(0, 96)); + } + return imagecolorallocate($image, $this->rand(0, 255), $this->rand(0, 255), $this->rand(0, 255)); + } + + /** + * Create a transparent image + * + * @param int $width + * @param int $height + * @return resource + * @throws \Exception + */ + protected function createTransparentImage($width, $height) + { + $image = @imagecreatetruecolor($width, $height); + if (!$image) { + throw new \Exception('Missing libgd support'); + } + imagealphablending($image, false); + $transparency = $this->transparentColor($image); + imagefill($image, 0, 0, $transparency); + imagecolordeallocate($image, $transparency); + imagesavealpha($image, true); + return $image; + } + +} |