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<?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;
}
}
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