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  • Qimage Component

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    In CakePhp we have a component called Quick Image Component or simply Qimage for uploading and manipulating images.

     

    Some of common methods that are used :

    • copy: to copy the uploaded images.
    • resize: to resize an image.
    • crop: to crop an image.
    • watermark: to add watermark in an image.

     

    While installing follow the following steps:

    • Copy QimageComponent.php file to /app/Controller/Component/
    • Add QimageComponent to components array of your controller: var $components = array('Qimage');
    • To call Qimage methods : $this->Qimage->methodName();

     

    Copy the code in QimageComponent.php

     

    <?php
    	
    	App::uses('Component', 'Controller');
    	
    	
    	/**
    	 *
    	 * CakePHP (version 2) component to upload, resize, crop and
    	 * add watermark to images.
    	 *
    	 * @author Angelito M. Goulart <ange.sap@hotmail.com>
    	 *
    	 */
    	class QimageComponent extends Component{
    		
    		/**
    		 * Watermark image file (must be png)
    		 *
    		 * @var string
    		 */
    		public $watermarkImage;		
    
    
    		/**
    		 * Jpeg image quality (0 - 100)
    		 *
    		 * @var int
    		 */
    		public $jpgQuality;
    
    		
    		/**
    		 * Property that will contain execution errors
    		 *
    		 * @var array
    		 */
    		private $errors;
    	
    		
    		/**
    		 * Initialize method. Initialize class properties.
    		 *
    		 * @param Controller $controller
    		 */
    		public function initialize(Controller $controller) {
    			$this->watermarkImage = "img" . DIRECTORY_SEPARATOR . "watermark.png";
    			$this->jpgQuality = 100;
    			$this->errors = array();
    		}
    	
    		
    		/**
    		 * Copy an uploaded image to the destination path
    		 *
    		 * $data['file'] 	-> array with image data (found in $_FILES)
    		 * $data['path'] 	-> destination path
    		 *
    		 * @param array $data
    		 * @return mixed
    		 */
    		public function copy($data){
    			
    			// Verify file and path
    			if (!isset($data['file']) || !isset($data['path']) || !is_array($data['file'])){
    				$this->errors[] = 'Name or path not found!';
    				return false;
    			}
    
    			if (!is_writable($data['path'])){
    				$this->errors[] = 'Destination path is not writable!';
    				return false;
    			}
    			
    			if (!$this->_verifyMime($data['file']['name'])){
    				$this->errors[] = 'The file must be an jpg, gif or png image!';
    				return false;
    			}
    			
    			// Generate filename and move file to destination path
    			$filename_array = explode('.', $data['file']['name']);
    			$ext = end($filename_array);
    			$ext = strtolower($ext);
    			$name = uniqid() . date('dmYHis') . '.' . $ext;
    			$complete_path = $data['path'] . DIRECTORY_SEPARATOR . $name;
    			
    			if (!move_uploaded_file($data['file']['tmp_name'], $data['path'] . $name)){
    				$this->errors[] = 'Error while upload the image!';
    				return false;
    			}
    			
    			// Return image filename
    			return $name;
    			
    		}
    		
    		
    		
    		/**
    		 * Adds a watermark on footer of an image.
    		 * The watermark image file must be informed in public $watermarkImage.
    		 *
    		 * $data['file'] -> image path
    		 *
    		 * @param array $data
    		 * @return bool
    		 */
    		public function watermark($data){
    			
    			// Verify files
    			if (!is_file($this->watermarkImage)){
    				$this->errors[] = 'Invalid watermark file!';
    				return false;
    			}
    			
    			if (!is_file($data['file'])){
    				$this->errors[] = 'Invalid file!';
    				return false;
    			}
    			
    			if(!$this->_verifyMime($data['file'])){
    				$this->errors[] = 'Invalid file type!';
    				return false;
    			}
    			
    			// Get image info
    			$img = getimagesize($data['file']);
    
    			// Get watermark image info
    			$wimg = getimagesize($this->watermarkImage);
    			if ($wimg['mime'] !== 'image/png') {
    				$this->errors[] = 'Watermark image must be png!';
    				return false;
    			}
    
    			$watermark = imagecreatefrompng($this->watermarkImage);
    			$watermark_width = imagesx($watermark);
    			$watermark_height = imagesy($watermark);
    			
    			// Defines watermark margin
    			$margin_right = $img[0] - $watermark_width - 15;
    			$margin_bottom = $img[1] - $watermark_height - 15;
    			
    			$createFunction = $this->_getCreateFunction($img['mime']);
    			$finishFunction = $this->_getFinishFunction($img['mime']);
    			if (false === $createFunction || false === $finishFunction) {
    				$this->errors[] = 'Invalid file type!';
    				return false;
    			}
    			
    			// Generate image with watermark
    			$image = $createFunction($data['file']);
    			imagecopy($image, $watermark, $margin_right, $margin_bottom, 0, 0, $watermark_width, $watermark_height);
    			
    			// Replace the original image with the new image with watermark
    			if ($img['mime'] == 'image/jpeg' || $img['mime'] == 'image/pjpeg'){
    				$finishFunction($image, $data['file'], (int) $this->jpgQuality);
    			} else {
    				$finishFunction($image, $data['file']);
    			}
    			
    			return true;
    		
    		}
    		
    		
    		/**
    		 * Method responsible for resize an image. Return false on error.
    		 *
    		 * $data['file']                -> complete path of original image file
    		 * $data['width']               -> new width
    		 * $data['height']              -> new height
    		 * $data['output']              -> output path where resized image will be saved
    		 * $data['proportional']        -> (true or false). If true, the image will be resized 
    		 * only if its dimensions are larger than the values reported in width and height 
    		 * parameters. Default: true.
    		 *
    		 * If only the width or height is given, the function will automatically calculate 
    		 * whether the image is horizontal or vertical and will automatically apply the informed 
    		 * size in the correct property (width or height).
    		 *
    		 * @param array $data
    		 * @return bool
    		 */
    		public function resize($data){
    			
    			// Verify parameters
    			if (!isset($data['file']) || (!isset($data['width']) && !isset($data['height']))){
    				$this->errors[] = 'Invalid filename or width/height!';
    				return false;
    			}
    			
    			if (!isset($data['output']) || !is_dir($data['output'])){
    				$this->errors[] = 'Invalid output dir!';
    				return false;
    			}
    			
    			$data['proportional'] = (isset($data['proportional'])) ? $data['proportional'] : true;
    
    			$data['height'] = (isset($data['height'])) ? $data['height'] : 0;
    			$data['width']  = (isset($data['width']))  ? $data['width']  : 0;
    			
    			if (!is_writable($data['output'])){
    				$this->errors[] = 'Output dir is not writable!';
    				return false;
    			}
    			
    			if (!is_file($data['file'])){
    				$this->errors[] = 'Invalid file!';
    				return false;
    			}
    		
    			if(!$this->_verifyMime($data['file'])){
    				$this->errors[] = 'Invalid file type!';
    				return false;
    			}
    			
    			// Validates width and height
    			$width  = (isset($data['width']))  ? (int) $data['width']  : 0;
    			$height = (isset($data['height'])) ? (int) $data['height'] : 0;		
    			
    			// Get attributes of image
    			$img = getimagesize($data['file']);
    			$original_width = $img[0];
    			$original_height = $img[1];
    			$mime = $img['mime'];
    					 			
    			$source = ($mime == 'image/png') ? imagecreatefrompng($data['file']) : imagecreatefromstring(file_get_contents($data['file']));
    			$filename = basename($data['file']);
    			$output = $data['output'] . $filename;
    			
    			// Verify if resize it's necessary
    			if (($width > $original_width || $height > $original_height) && $data['proportional'] === true){
    			
    				$width = $original_width;
    				$height = $original_height;
    			
    			} else {
    				
    				// If width or height not defined, it's necessary calculate proportional size
    				if (!($width > 0 && $height > 0)){
    					
    					
    					// Verify if image is horizontal or vertical
    					if ($original_height > $original_width){
    						$height = ($data['width'] > 0) ? $data['width'] : $data['height'];
    						$width  = ($height / $original_height) * $original_width;
    					} else {
    						$width = ($data['height'] > 0) ? $data['height'] : $data['width'];
    						$height = ($width / $original_width) * $original_height;
    					}
    					
    				} 
    			
    			}
    			
    			// Generate thumb
    			$thumb = imagecreatetruecolor($width, $height);
    			
    			// Add transparency if image is png
    			if ($mime == 'image/png') {
    				imagealphablending($thumb, false);
    				imagesavealpha($thumb,true);
    				$transparent = imagecolorallocatealpha($thumb, 255, 255, 255, 127);
    				imagefilledrectangle($thumb, 0, 0, $width, $height, $transparent);
    			} 
    			
    			// Finish image
    			imagecopyresampled($thumb, $source, 0, 0, 0, 0, $width, $height, $original_width, $original_height);
    			$finishFunction = $this->_getFinishFunction($mime); 
    						
    			if (false === $finishFunction) { 
    				$this->errors[] = 'Invalid file type.';
    				return false;	
    			} elseif ($mime == 'image/jpeg' || $mime == 'image/pjpeg') {
    				$finishFunction($thumb, $output, (int) $this->jpgQuality);
    			} else {
    				$finishFunction($thumb, $output);
    			} 
    
    			return true;
    			
    		}
    
    
    		/**
    		 * Method to crop an image
    		 * 
    		 * $data['file']        -> complete path of original image file
    		 * $data['w']           -> width of crop area
    		 * $data['h']           -> height of crop area
    		 * $data['x']           -> x coordinate of source point
    		 * $data['y']           -> y coordinate of source point
    		 * $data['output']      -> output path where cropped image will be saved
    		 *
    		 * @param array $data
    		 * @return bool
    		 */
    		public function crop($data = array()){
    
    			// Validates params
    			if (!isset($data['file']) ||
    			    !isset($data['w']) ||
    			    !isset($data['h']) ||
    			    !isset($data['x']) ||
    			    !isset($data['y']) ||
    			    !isset($data['output'])) {
    				 $this->errors[] = 'Params missing!';
    			}
    			
    			if (!is_file($data['file'])) {
    				$this->errors[] = 'Invalid image!';
    				return false;
    			}
    
    			if (!is_dir($data['output']) || !is_writable($data['output'])) {
    				$this->errors[] = 'Output dir is not a dir or not writeable!';
    				return false;
    			}
    
    			// Output path
    			$path = $data['output'] . DIRECTORY_SEPARATOR . basename($data['file']);
    
    			// Get image data
    			$img = getimagesize($data['file']);
    
    			$createFunction = $this->_getCreateFunction($img['mime']);
    			$finishFunction = $this->_getFinishFunction($img['mime']);
    
    			// Create source and destination image
    			$src_img = $createFunction($data['file']);
    			$dst_img = imagecreatetruecolor($data['w'], $data['h']);
    
    			// Crop image
    			imagecopyresampled($dst_img, 
    					   $src_img, 
    					   0, 
    					   0, 
    					   (int) $data['x'], 
    					   (int) $data['y'],
    	        			   (int) $data['w'],
    	        			   (int) $data['h'],
    	        			   (int) $data['w'], 
    	        			   (int) $data['h']);
    
    			// Finish image
    			if ($img['mime'] == 'image/jpeg' || $img['mime'] == 'image/pjpeg'){
    				$finishFunction($dst_img, $path, (int) $this->jpgQuality);
    			} else {
    				$finishFunction($dst_img, $path);
    			}
    
    		}
    		
    		
    		/** 
    		 * Verifies the mime-type of a file
    		 *
    		 * @param string $file
    		 * @return bool
    		 */
    		private function _verifyMime($file){
    			
    			$filename_array = explode('.',$file);
    
    			$extension = end($filename_array);
    			
    			$extension = strtolower($extension);
    			
    			$mimes = array('jpeg', 'jpg', 'png', 'gif');
    			
    			if (in_array($extension, $mimes)){
    				return true;
    			} else {
    				return false;
    			}
    			
    		}
    
    
    		/**
    		 * Method to get the specific function to create an image
    		 * 
    		 * @param string $mime
    		 * @return string
    		 */
    		private function _getCreateFunction($mime){
    		    if ($mime == 'image/jpeg' || $mime == 'image/pjpeg'){
    	            	return 'imagecreatefromjpeg';
    		    } elseif ($mime == 'image/gif') {
    		        return 'imagecreatefromgif';
    		    } elseif ($mime == 'image/png') {
    		        return 'imagecreatefrompng';
    		    } else {
    		        $this->errors[] = 'Invalid file type!';
    		        return false;
    		    }
    		}
    
    
    		/**
    		 * Method to get the specific function to finish an image
    		 *
    		 * @param string $mime
    		 * @return string
    		 */
    		private function _getFinishFunction($mime) {
    			if ($mime == 'image/jpeg' || $mime == 'image/pjpeg'){
    				return 'imagejpeg';
    			} elseif ($mime == 'image/gif') {
    				return 'imagegif';
    			} elseif ($mime == 'image/png') {
    				return 'imagepng';
    			} else {
    				$this->errors[] = 'Invalid file type.';
    				return false;	
    			}
    		}
    
    
    		/**
    		 * Get errors
    		 *
    		 * @return array
    		 */
    		public function getErrors() {
    			return $this->errors;
    		}
    
    		
    	}
    	
    ?>
    

     

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