JImage Method for resize

gistfile1.php

<?php
/**
 * @package     Vehicles
 * @subpackage  com_vehicles
 * @copyright   Copyright (C) 2012 AtomTech, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

// No direct access
defined('_JEXEC') or die;

jimport('joomla.image.image');
jimport('joomla.filesystem.folder');
jimport('joomla.filesystem.file');

/**
 * Image component helper.
 *
 * @package     Hello
 * @subpackage  com_hello
 * @since       2.5
 */
abstract class ImageHelper
{
	/**
	 * Function to create thumb
	 *
	 * @param   string   $image   The path to full image
	 * @param   array    $sizes   The thumb sizes. Example: array('50x50','120x250');
	 * @param   string   $folder  The thumbs destination folder
	 * @param   integer  $method  The thumbnail creation method.
	 *
	 * @return  array of generated thumbnails
	 *
	 * @since   2.5
	 */
	public static function createThumb($image, $sizes, $folder, $method = 2)
	{
		if (!empty($sizes) && JFile::exists($image))
		{
			// Accept a single size string as parameter
			if (!is_array($sizes))
			{
				$sizes = array($sizes);
			}

			// Check | try to creaate folder
			if (JFolder::exists($folder) || JFolder::create($folder))
			{
				$generated = array();

				// Process thumbs
				foreach ($sizes as $size)
				{
					// Get thumb size
					$size = explode('x', strtolower($size));

					if (count($size) != 2)
					{
						return false;
					}

					$width = $size[0];
					$height = $size[1];

					// Source object
					$sourceImage = new JImage($image);
					$srcHeight = $sourceImage->getHeight();
					$srcWidth = $sourceImage->getWidth();
					$properties = JImage::getImageFileProperties($image);

					// Generate thumb name
					$filename = JFile::getName($image);
					$extension = JFile::getExt($filename);
					$thumbname = str_replace('.' . $extension, '_' . $width . 'x' . $height . '.' . $extension, $filename);

					// Try to generate the thumb
					if ($method == 4)
					{
						// Auto crop centered coordinates
						$left = round(($srcWidth - $width) / 2);
						$top = round(($srcHeight - $height) / 2);

						// Crop image
						$thumb = $sourceImage->crop($width, $height, $left, $top, true);
					}
					else
					{
						// Resize image
						$thumb = $sourceImage->resize($width, $height, true, $method);
					}
					
					if ($properties->type == 3)
					{
						$quality = 9;
					}
					elseif ($properties->type == 2)
					{
						$quality = 60;
					}

					$thumbname = $folder . '/' . $thumbname;

					if (!JFile::exists($thumbname))
					{
						$thumb->toFile($thumbname, $properties->type, array('quality' => $quality));
						$generated[] = $thumbname;
					}
					else
					{
						$generated[] = $thumbname;
					}
				}

				return $generated;
			}
		}

		return false;
	}
}