ThumbnailFilterService.php

<?php 

use \Imagine;

use Avalanche\Bundle\ImagineBundle\Imagine\Filter\Loader\LoaderInterface;

class ThumbnailFilterService implements LoaderInterface, Imagine\Filter\FilterInterface
{
	const DEFAULT_WIDTH = 120;
	const DEFAULT_HEIGHT = 120;
	const DEFAULT_BACKGROUND_COLOR = '222'; // HEX x222
	const DEFAULT_ALPHA = 0;
	
	protected $canvas_width;
	protected $canvas_height;
	protected $canvas_background_color;
	protected $canvas_alpha;
	
	public function load(array $options = array())
	{
		if(isset($options['size']) && count($options['size']) == 2)
		{
			list($this->canvas_width, $this->canvas_height) = $options['size'];
		}
		else
		{
			$this->canvas_width = self::DEFAULT_WIDTH;
			$this->canvas_height = self::DEFAULT_HEIGHT;
		}
		
		$this->canvas_background_color = isset($options['background_color']) ? $options['background_color'] : self::DEFAULT_BACKGROUND_COLOR;
		$this->canvas_alpha = isset($options['alpha']) ? $options['alpha'] : self::DEFAULT_ALPHA;  
		
		return $this;
	}

	public function apply(Imagine\Image\ImageInterface $image)
	{
		$canvas_box = new Imagine\Image\Box($this->canvas_width, $this->canvas_height);
		$image = $image->thumbnail($canvas_box, Imagine\Image\ImageInterface::THUMBNAIL_INSET);
		
		$image_height = $image->getSize()->getHeight();
		$image_width = $image->getSize()->getWidth();
		
		$imagine = new Imagine\Gd\Imagine();
		$canvas = $imagine->create(
			$canvas_box,
			new Imagine\Image\Color($this->canvas_background_color, $this->canvas_alpha)
		);
		
		$center_x = abs($this->canvas_width - $image_width) / 2;
		$center_y = abs($this->canvas_height - $image_height) / 2;
		
		$start_point = new Imagine\Image\Point($center_x, $center_y);
		
		/*
		var_dump(array(
			'canvas_alpha' => $this->canvas_alpha,
			'canvas_width' => $canvas_box->getWidth(),
			'canvas_height' => $canvas_box->getHeight(),
			'image_width' => $image_width,
			'image_height' => $image_height,
			'center_x' => $center_x,
			'center_y' => $center_y
		)); die();
		*/
		
		return $canvas->paste($image, $start_point);
	}
}