Maslosoft Sprite API
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/**
* This software package is licensed under AGPL or Commercial license.
*
* @package maslosoft/sprite
* @licence AGPL or Commercial
* @copyright Copyright (c) Piotr Masełkowski <pmaselkowski@gmail.com>
* @copyright Copyright (c) Maslosoft
* @copyright Copyright (c) Others as mentioned in code
* @link http://maslosoft.com/sprite/
*/
namespace Maslosoft\Sprite\Models;
use Maslosoft\Sprite\Helpers\ImageSorter;
/**
* Collection of image groups
*
* @author Piotr Maselkowski <pmaselkowski at gmail.com>
*/
class Collection
{
/**
* Total width of all groups
* @var int
*/
public $width = 0;
/**
* Total height of all groups
* @var int
*/
public $height = 0;
private $sprites = [];
/**
* Image groups
* @var Group[]
*/
private $groups = [];
/**
*
* @param SpriteImage[] $sprites
*/
public function __construct($sprites = [])
{
ImageSorter::sort($sprites);
$this->sprites = $sprites;
}
/**
* Get groups
* @return Group[]
*/
public function getGroups()
{
if (empty($this->groups))
{
$this->createGroups();
}
return $this->groups;
}
/**
* Get all sprites
* @return SpriteImage[]
*/
public function getSprites()
{
return $this->sprites;
}
private function createGroups()
{
/**
* TODO Sprites should be regrouped by hash,
* however packages need to be merged too.
* Without hash grouping resulting images
* and CSS might contain duplicates.
*/
$imagesCount = count($this->sprites);
$splitFactor = floor(sqrt($imagesCount));
$split = ceil($imagesCount / $splitFactor);
$m = 0;
$i = 1;
$totalHeight = 0;
$totalWidth = 0;
$height = 0;
$doSplit = false;
$counter = 0;
$column = [];
$columns = [];
$groups = [];
// Integer indexed sprites
$images = array_values($this->sprites);
foreach ($images as $id => $image)
{
/* @var $image SpriteImage */
/* @var $nextImage SpriteImage */
$counter++;
$column['widths'][] = $image->width;
$column['heights'][] = $image->height;
$column['images'][] = $image;
$column['width'] = max($column['widths']);
$column['height'] = (int) array_sum($column['heights']);
if (isset($images[$id + 1]))
{
$nextImage = $images[$id + 1];
}
else
{
$nextImage = [];
}
// Split because it's last image
if ($counter == $imagesCount)
{
$doSplit = true;
}
// Split because image number is above split treshold
if ($i > $split)
{
$doSplit = true;
}
// Ignore small image width differences
if ($nextImage && round($nextImage->width / 10) > round($image->width / 10))
{
$doSplit = true;
}
// Split because height is different
if ($height && $column['height'] >= $height)
{
$doSplit = true;
}
// Do split (create new column of images) if nessesary
if ($doSplit)
{
// Ignore first small images if there are not enough of them
if (count($column['heights']) > $split || $height)
{
$height = max($height, $column['height']);
}
unset($column['widths']);
unset($column['heights']);
$group = new Group();
$group->sprites = $column['images'];
$group->width = (int) $column['width'];
$group->height = (int) $column['height'];
$groups[$m] = $group;
$columns[$m] = $column;
$i = 0;
$m++;
$column = [];
$doSplit = false;
}
$i++;
}
foreach ($columns as $key => $dimensions)
{
$groups[$key]->offset = $totalWidth;
$totalWidth += $dimensions['width'];
if ($dimensions['height'] > $totalHeight)
{
$totalHeight = $dimensions['height'];
}
}
$this->height = $totalHeight;
$this->width = $totalWidth;
$this->groups = $groups;
}
}
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