Library untuk resize dan crop image sekaligus

 
if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 
class Myresizer {
 
    function resizecrop($params){
		//ambil nilai dari parameter
		$file=$params['file'];
		$width=$params['width'];
		$height=$params['height'];
		$newwidth=$params['newwidth'];
		$newheight=$params['newheight'];
 
		//load library image_lib CodeIgniter 			
		$CI =& get_instance();
		$CI->load->library('image_lib');
 
		$config['source_image'] = $file;
		if(!empty($params['newfile']) )
			$config['new_image'] = $params['newfile'];
		$config['width'] = $newwidth;
		$config['height'] = $newheight;
		$config['maintain_ratio'] = TRUE;
 
		//menghitung posisi tengah untuk crop dan master_dim untuk resize	
		if( ($width/$newwidth) <= ($height/$newheight) ){
			$diff = ($newwidth/$width*$height)-$newheight;
			$x_axis = 0;
			$y_axis = round($diff / 2);
			$config['master_dim'] = 'width';
		}else{
			$diff = ($newheight/$height*$width)-$newwidth;
			$x_axis = round($diff / 2);
			$y_axis = 0;
			$config['master_dim'] = 'height';
		}
		$CI->image_lib->initialize($config);
		if ( ! $CI->image_lib->resize()){
			echo $CI->image_lib->display_errors();
		}
		unset($config);            
		$CI->image_lib->clear();
 
		//cropping
		if(!empty($params['newfile']) )
			$config['source_image'] = $params['newfile'];
		else
			$config['source_image'] = $file;
		$config['x_axis'] = $x_axis;
		$config['y_axis'] = $y_axis;
		$config['maintain_ratio'] = FALSE;
		$config['width'] = $newwidth;
		$config['height'] = $newheight;
 
		$CI->image_lib->initialize($config);
		if ( ! $CI->image_lib->crop()){
			echo $CI->image_lib->display_errors();
		}
		unset($config);            
		$CI->image_lib->clear();
    }
}

if($this->upload->do_upload('image')){ //contoh kasus upload image
					$tp=$this->upload->data(); //ambil atribut data yang baru saja diupload
					$image= "images/userimages/".$tp['file_name']; //jangan lupa diset permissionnya
					$newwidth=320; //width yang diinginkan
					$newheight=200; //height yang diinginkan
 
					$this->load->library('myresizer'); //load library
					$params = array(
						'file' => $image, 
						'width' => $tp['image_width'],
						'height' => $tp['image_height'],
						'newwidth' => $newwidth,
						'newheight' => $newheight
					);
					$this->myresizer->resizecrop($params);
				} else {
					echo $this->upload->display_errors();
				}