Mercurial > judyates

     1 <?php

     2 /**

     3  * Styx::Image - Provides an Interface to the GD-Library for image manipulation

     4  *

     5  * @package Styx

     6  * @subpackage Utility

     7  *

     8  * @license MIT-style License

     9  * @author Christoph Pojer <christoph.pojer@gmail.com>

    10  *

    11  * @link http://www.bin-co.com/php/scripts/classes/gd_image/ Based on work by "Binny V A"

    12  */

    13 

    14 class Image {

    15 	/**

    16 	 * The path to the image file

    17 	 *

    18 	 * @var string

    19 	 */

    20 	private $file;

    21 	/**

    22 	 * The image resource

    23 	 *

    24 	 * @var resource

    25 	 */

    26 	private $image;

    27 	/**

    28 	 * Metadata regarding the image

    29 	 *

    30 	 * @var array

    31 	 */

    32 	private $meta;

    33 	

    34 	/**

    35 	 * @param string $file The path to the image file

    36 	 */

    37 	public function __construct($file){

    38 		$file = realpath($file);

    39 		if(!file_exists($file))

    40 			return;

    41 		

    42 		$this->file = $file;

    43 		$img = getimagesize($file);

    44 

    45 		$this->meta = array(

    46 			'width' => $img[0],

    47 			'height' => $img[1],

    48 			'mime' => $img['mime'],

    49 			'ext' => end(explode('/', $img['mime'])),

    50 		);

    51 		if($this->meta['ext']=='jpg')

    52 			$this->meta['ext'] = 'jpeg';

    53 		

    54 		if(!in_array($this->meta['ext'], array('gif', 'png', 'jpeg')))

    55 			return;

    56 		

    57 		if(in_array($this->meta['ext'], array('gif', 'png'))){

    58 			$this->image = $this->create();

    59 			

    60 			$fn = 'imagecreatefrom'.$this->meta['ext'];

    61 			$original = $fn($file);

    62 			imagecopyresampled($this->image, $original, 0, 0, 0, 0, $this->meta['width'], $this->meta['height'], $this->meta['width'], $this->meta['height']);

    63 		}else{

    64 			$this->image = imagecreatefromjpeg($file);

    65 		}

    66 	}

    67 	

    68 	public function __destruct(){

    69 		if(!empty($this->image)) imagedestroy($this->image);

    70 	}

    71 	

    72 	/**

    73 	 * Returns the size of the image

    74 	 *

    75 	 * @return array

    76 	 */

    77 	public function getSize(){

    78 		return array(

    79 			'width' => $this->meta['width'],

    80 			'height' => $this->meta['height'],

    81 		);

    82 	}

    83 	

    84 	/**

    85 	 * Creates a new, empty image with the desired size

    86 	 *

    87 	 * @param int $x

    88 	 * @param int $y

    89 	 * @param string $ext

    90 	 * @return resource

    91 	 */

    92 	private function create($x = null, $y = null, $ext = null){

    93 		if(!$x) $x = $this->meta['width'];

    94 		if(!$y) $y = $this->meta['height'];

    95 		

    96 		$image = imagecreatetruecolor($x, $y);

    97 		if(!$ext) $ext = $this->meta['ext'];

    98 		if($ext=='png'){

    99 			imagealphablending($image, false);

   100 			imagefilledrectangle($image, 0, 0, $x, $y, imagecolorallocatealpha($image, 0, 0, 0, 127));

   101 		}

   102 		

   103 		return $image;

   104 	}

   105 	

   106 	/**

   107 	 * Replaces the image resource with the given parameter

   108 	 *

   109 	 * @param resource $new

   110 	 */

   111 	private function set($new){

   112 		imagedestroy($this->image);

   113 		$this->image = $new;

   114 		

   115 		$this->meta['width'] = imagesx($this->image);

   116 		$this->meta['height'] = imagesy($this->image);

   117 	}

   118 	

   119 	/**

   120 	 * Returns the path to the image file

   121 	 *

   122 	 * @return string

   123 	 */

   124 	public function getPathname(){

   125 		return $this->file;

   126 	}

   127 	

   128 	/**

   129 	 * Rotates the image by the given angle

   130 	 *

   131 	 * @param int $angle

   132 	 * @param array $bgcolor An indexed array with red/green/blue/alpha values

   133 	 * @return Image

   134 	 */

   135 	public function rotate($angle, $bgcolor = null){

   136 		if(empty($this->image) || !$angle || $angle>=360) return $this;

   137 		

   138 		$this->set(imagerotate($this->image, $angle, is_array($bgcolor) ? imagecolorallocatealpha($this->image, $bgcolor[0], $bgcolor[1], $bgcolor[2], !empty($bgcolor[3]) ? $bgcolor[3] : null) : $bgcolor));

   139 

   140 		return $this;

   141 	}

   142 	

   143 	/**

   144 	 * Resizes the image to the given size, automatically calculates

   145 	 * the new ratio if parameter {@link $ratio} is set to true

   146 	 *

   147 	 * @param int $x

   148 	 * @param int $y

   149 	 * @param bool $ratio

   150 	 * @return Image

   151 	 */

   152 	public function resize($x = null, $y = null, $ratio = true){

   153 		if(empty($this->image) || (!$x && !$y)) return $this;

   154 		

   155 		if(!$y) $y = $ratio ? $this->meta['height']*$x/$this->meta['width'] : $this->meta['height'];

   156 		if(!$x) $x = $ratio ? $this->meta['width']*$y/$this->meta['height'] : $this->meta['width'];

   157 		

   158 		$new = $this->create($x, $y);

   159 		imagecopyresampled($new, $this->image, 0, 0, 0, 0, $x, $y, $this->meta['width'], $this->meta['height']);

   160 		$this->set($new);

   161 		

   162 		return $this;

   163 	}

   164 	

   165 	/**

   166 	 * Crops the image. The values are given like margin/padding values in css

   167 	 *

   168 	 * <b>Example</b>

   169 	 * <ul>

   170 	 * <li>crop(10) - Crops by 10px on all sides</li>

   171 	 * <li>crop(10, 5) - Crops by 10px on top and bottom and by 5px on left and right sides</li>

   172 	 * <li>crop(10, 5, 5) - Crops by 10px on top and by 5px on left, right and bottom sides</li>

   173 	 * <li>crop(10, 5, 3, 2) - Crops by 10px on top, 5px by right, 3px by bottom and 2px by left sides</li>

   174 	 * </ul>

   175 	 *

   176 	 * @param int $top

   177 	 * @param int $right

   178 	 * @param int $bottom

   179 	 * @param int $left

   180 	 * @return Image

   181 	 */

   182 	public function crop($top, $right = null, $bottom = null, $left = null){

   183 		if(empty($this->image)) return $this;

   184 		

   185 		if(!is_numeric($right) && !is_numeric($bottom) && !is_numeric($left))

   186 			$right = $bottom = $left = $top;

   187 		

   188 		if(!is_numeric($bottom) && !is_numeric($left)){

   189 			$bottom = $top;

   190 			$left = $right;

   191 		}

   192 		

   193 		if(!is_numeric($left))

   194 			$left = $right;

   195 		

   196 		$x = $this->meta['width']-$left-$right;

   197 		$y = $this->meta['height']-$top-$bottom;

   198 

   199 		if($x<0 || $y<0) return $this;

   200 		

   201 		$new = $this->create($x, $y);

   202 		imagecopy($new, $this->image, 0, 0, $left, $top, $x, $y);

   203 		$this->set($new);

   204 		

   205 		return $this;

   206 	}

   207 	

   208 	/**

   209 	 * Flips the image horizontally or vertically. To Flip both just use ->rotate(180)

   210 	 *

   211 	 * @see Image::rotate()

   212 	 * @param string $type Either horizontal or vertical

   213 	 * @return Image

   214 	 */

   215 	public function flip($type){

   216 		if(empty($this->image) || !in_array($type, array('horizontal', 'vertical'))) return $this;

   217 		

   218 		$new = $this->create();

   219 		

   220 		if($type=='horizontal')

   221 			for($x=0;$x<$this->meta['width'];$x++)

   222 				imagecopy($new, $this->image, $this->meta['width']-$x-1, 0, $x, 0, 1, $this->meta['height']);

   223 		elseif($type=='vertical')

   224 			for($y=0;$y<$this->meta['height'];$y++)

   225 				imagecopy($new, $this->image, 0, $this->meta['height']-$y-1, 0, $y, $this->meta['width'], 1);

   226 		

   227 		$this->set($new);

   228 		

   229 		return $this;

   230 	}

   231 	

   232 	/**

   233 	 * Stores the image in the desired directory or outputs it

   234 	 *

   235 	 * @param string $ext

   236 	 * @param string $file

   237 	 */

   238 	private function process($ext = null, $file = null){

   239 		if(!$ext) $ext = $this->meta['ext'];

   240 		

   241 		if($ext=='png') imagesavealpha($this->image, true);

   242 		$fn = 'image'.$ext;

   243 		$fn($this->image, $file);

   244 		

   245 		// If there is a new filename change the internal name too

   246 		if($file) $this->file = $file;

   247 	}

   248 

   249 	/**

   250 	 * Saves the image to the given path

   251 	 *

   252 	 * @param string $file Leave empty to replace the original file

   253 	 * @return Image

   254 	 */

   255 	public function save($file = null){

   256 		if(empty($this->image)) return $this;

   257 		

   258 		if(!$file) $file = $this->file;

   259 		

   260 		$ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));

   261 		if(!$ext){

   262 			$file .= '.'.$this->meta['ext'];

   263 			$ext = $this->meta['ext'];

   264 		}

   265 		

   266 		if($ext=='jpg') $ext = 'jpeg';

   267 		

   268 		if(!in_array($ext, array('png', 'jpeg', 'gif')))

   269 			return $this;

   270 		

   271 		$this->process($ext, $file);

   272 		

   273 		return $this;

   274 	}

   275 

   276 	/**

   277 	 * Outputs the manipulated image

   278 	 *

   279 	 * @return Image

   280 	 */

   281 	public function show(){

   282 		if(empty($this->image)) return $this;

   283 		

   284 		header('Content-type: '.$this->meta['mime']);

   285 		$this->process();

   286 		

   287 		return $this;

   288 	}

   289 	

   290 }
author	Robert McIntyre <rlm@mit.edu>
date	Sun, 08 Sep 2013 00:47:09 -0400
parents	3f6b44aa6b35
children