Mistralys / application-utils

src/ImageHelper.php

Indentation +394 added lines, -394 removed lines

@@ -66,54 +66,54 @@ 
     
     const ERROR_GD_LIBRARY_NOT_INSTALLED = 513024;
 
-   /**
-    * @var string
-    */
+    /**
+     * @var string
+     */
     protected $file;
 
-   /**
-    * @var ImageHelper_Size
-    */
+    /**
+     * @var ImageHelper_Size
+     */
     protected $info;
 
-   /**
-    * @var string
-    */
+    /**
+     * @var string
+     */
     protected $type;
 
-   /**
-    * @var resource|NULL
-    */
+    /**
+     * @var resource|NULL
+     */
     protected $newImage;
 
-   /**
-    * @var resource
-    */
+    /**
+     * @var resource
+     */
     protected $sourceImage;
 
-   /**
-    * @var int
-    */
+    /**
+     * @var int
+     */
     protected $width;
 
-   /**
-    * @var int
-    */
+    /**
+     * @var int
+     */
     protected $height;
 
-   /**
-    * @var int
-    */
+    /**
+     * @var int
+     */
     protected $newWidth = 0;
 
-   /**
-    * @var int
-    */
+    /**
+     * @var int
+     */
     protected $newHeight = 0;
 
-   /**
-    * @var int
-    */
+    /**
+     * @var int
+     */
     protected $quality = 85;
     
     protected static $imageTypes = array(
@@ -201,17 +201,17 @@ 
         }
     }
 
-   /**
-    * Factory method: creates a new helper with a blank image.
-    * 
-    * @param integer $width
-    * @param integer $height
-    * @param string $type The target file type when saving
-    * @return ImageHelper
-    * @throws ImageHelper_Exception
-    *
-    * @see ImageHelper::ERROR_CANNOT_CREATE_IMAGE_OBJECT
-    */
+    /**
+     * Factory method: creates a new helper with a blank image.
+     * 
+     * @param integer $width
+     * @param integer $height
+     * @param string $type The target file type when saving
+     * @return ImageHelper
+     * @throws ImageHelper_Exception
+     *
+     * @see ImageHelper::ERROR_CANNOT_CREATE_IMAGE_OBJECT
+     */
     public static function createNew($width, $height, $type='png')
     {
         $img = imagecreatetruecolor($width, $height);
@@ -226,18 +226,18 @@ 
         );
     }
     
-   /**
-    * Factory method: creates an image helper from an
-    * existing image resource.
-    *
-    * Note: while the resource is type independent, the
-    * type parameter is required for some methods, as well
-    * as to be able to save the image.
-    *
-    * @param resource $resource
-    * @param string $type The target image type, e.g. "jpeg", "png", etc.
-    * @return ImageHelper
-    */
+    /**
+     * Factory method: creates an image helper from an
+     * existing image resource.
+     *
+     * Note: while the resource is type independent, the
+     * type parameter is required for some methods, as well
+     * as to be able to save the image.
+     *
+     * @param resource $resource
+     * @param string $type The target image type, e.g. "jpeg", "png", etc.
+     * @return ImageHelper
+     */
     public static function createFromResource($resource, ?string $type=null)
     {
         self::requireResource($resource);
@@ -245,29 +245,29 @@ 
         return new ImageHelper(null, $resource, $type);
     }
     
-   /**
-    * Factory method: creates an image helper from an
-    * image file on disk.
-    *
-    * @param string $path
-    * @return ImageHelper
-    */
+    /**
+     * Factory method: creates an image helper from an
+     * image file on disk.
+     *
+     * @param string $path
+     * @return ImageHelper
+     */
     public static function createFromFile($file)
     {
         return new ImageHelper($file);
     }
     
-   /**
-    * Sets a global image helper configuration value. Available
-    * configuration settings are:
-    * 
-    * <ul>
-    * <li><code>auto-memory-adjustment</code> <i>boolean</i> Whether totry and adjust the memory limit automatically so there will be enough to load/process the target image.</li>
-    * </ul>
-    * 
-    * @param string $name
-    * @param mixed $value
-    */
+    /**
+     * Sets a global image helper configuration value. Available
+     * configuration settings are:
+     * 
+     * <ul>
+     * <li><code>auto-memory-adjustment</code> <i>boolean</i> Whether totry and adjust the memory limit automatically so there will be enough to load/process the target image.</li>
+     * </ul>
+     * 
+     * @param string $name
+     * @param mixed $value
+     */
     public static function setConfig($name, $value)
     {
         if(isset(self::$config[$name])) {
@@ -275,22 +275,22 @@ 
         }
     }
     
-   /**
-    * Shorthand for setting the automatic memory adjustment
-    * global configuration setting.
-    * 
-    * @param bool $enabled
-    */
+    /**
+     * Shorthand for setting the automatic memory adjustment
+     * global configuration setting.
+     * 
+     * @param bool $enabled
+     */
     public static function setAutoMemoryAdjustment($enabled=true)
     {
         self::setConfig('auto-memory-adjustment', $enabled);
     }
     
-   /**
-    * Duplicates an image resource.
-    * @param resource $img
-    * @return resource
-    */
+    /**
+     * Duplicates an image resource.
+     * @param resource $img
+     * @return resource
+     */
     protected function duplicateImage($img)
     {
         self::requireResource($img);
@@ -302,12 +302,12 @@ 
         return $duplicate;
     }
     
-   /**
-    * Duplicates the current state of the image into a new
-    * image helper instance.
-    * 
-    * @return ImageHelper
-    */
+    /**
+     * Duplicates the current state of the image into a new
+     * image helper instance.
+     * 
+     * @return ImageHelper
+     */
     public function duplicate()
     {
         return ImageHelper::createFromResource($this->duplicateImage($this->newImage));
@@ -495,13 +495,13 @@ 
         ));
     }
     
-   /**
-    * Resamples the image to a new width, maintaining
-    * aspect ratio.
-    * 
-    * @param int $width
-    * @return ImageHelper
-    */
+    /**
+     * Resamples the image to a new width, maintaining
+     * aspect ratio.
+     * 
+     * @param int $width
+     * @return ImageHelper
+     */
     public function resampleByWidth(int $width) : ImageHelper
     {
         $size = $this->getSizeByWidth($width);
@@ -511,12 +511,12 @@ 
         return $this;
     }
 
-   /**
-    * Resamples the image by height, and creates a new image file on disk.
-    * 
-    * @param int $height
-    * @return ImageHelper
-    */
+    /**
+     * Resamples the image by height, and creates a new image file on disk.
+     * 
+     * @param int $height
+     * @return ImageHelper
+     */
     public function resampleByHeight($height) : ImageHelper
     {
         $size = $this->getSizeByHeight($height);
@@ -524,13 +524,13 @@ 
         return $this->resampleImage($size->getWidth(), $size->getHeight());
     }
 
-   /**
-    * Resamples the image without keeping the aspect ratio.
-    * 
-    * @param int $width
-    * @param int $height
-    * @return ImageHelper
-    */
+    /**
+     * Resamples the image without keeping the aspect ratio.
+     * 
+     * @param int $width
+     * @param int $height
+     * @return ImageHelper
+     */
     public function resample(?int $width = null, ?int $height = null) : ImageHelper
     {
         if($this->isVector()) {
@@ -595,12 +595,12 @@ 
     
     protected $alpha = false;
 
-   /**
-    * Configures the specified image resource to make it alpha compatible.
-    * 
-    * @param resource $canvas
-    * @param bool $fill Whether to fill the whole canvas with the transparency
-    */
+    /**
+     * Configures the specified image resource to make it alpha compatible.
+     * 
+     * @param resource $canvas
+     * @param bool $fill Whether to fill the whole canvas with the transparency
+     */
     public static function addAlphaSupport($canvas, $fill=true)
     {
         self::requireResource($canvas);
@@ -715,12 +715,12 @@ 
         $this->quality = $quality * 1;
     }
 
-   /**
-    * Attempts to adjust the memory to the required size
-    * to work with the current image.
-    * 
-    * @return boolean
-    */
+    /**
+     * Attempts to adjust the memory to the required size
+     * to work with the current image.
+     * 
+     * @return boolean
+     */
     protected function adjustMemory() : bool
     {
         if(!self::$config['auto-memory-adjustment']) {
@@ -760,27 +760,27 @@ 
         return false;
     }
 
-   /**
-    * Stretches the image to the specified dimensions.
-    * 
-    * @param int $width
-    * @param int $height
-    * @return ImageHelper
-    */
+    /**
+     * Stretches the image to the specified dimensions.
+     * 
+     * @param int $width
+     * @param int $height
+     * @return ImageHelper
+     */
     public function stretch(int $width, int $height) : ImageHelper
     {
         return $this->resampleImage($width, $height);
     }
 
-   /**
-    * Creates a new image from the current image,
-    * resampling it to the new size.
-    * 
-    * @param int $newWidth
-    * @param int $newHeight   
-    * @throws ImageHelper_Exception
-    * @return ImageHelper
-    */
+    /**
+     * Creates a new image from the current image,
+     * resampling it to the new size.
+     * 
+     * @param int $newWidth
+     * @param int $newHeight   
+     * @throws ImageHelper_Exception
+     * @return ImageHelper
+     */
     protected function resampleImage(int $newWidth, int $newHeight) : ImageHelper
     {
         if($this->isVector()) {
@@ -920,31 +920,31 @@ 
         readfile($imageFile);
     }
     
-   /**
-    * Displays the current image.
-    */
+    /**
+     * Displays the current image.
+     */
     public function display()
     {
         $this->displayImageStream($this->newImage, $this->getType(), $this->resolveQuality());
     }
     
-   /**
-    * Trims the current loaded image.
-    * 
-    * @param array $color A color definition, as an associative array with red, green, and blue keys. If not specified, the color at pixel position 0,0 will be used.
-    */
+    /**
+     * Trims the current loaded image.
+     * 
+     * @param array $color A color definition, as an associative array with red, green, and blue keys. If not specified, the color at pixel position 0,0 will be used.
+     */
     public function trim($color=null)
     {
         return $this->trimImage($this->newImage, $color);
     }
     
-   /**
-    * Retrieves a color definition by its index.
-    * 
-    * @param resource $img A valid image resource.
-    * @param int $colorIndex The color index, as returned by imagecolorat for example.
-    * @return array An array with red, green, blue and alpha keys.
-    */
+    /**
+     * Retrieves a color definition by its index.
+     * 
+     * @param resource $img A valid image resource.
+     * @param int $colorIndex The color index, as returned by imagecolorat for example.
+     * @return array An array with red, green, blue and alpha keys.
+     */
     public function getIndexedColors($img, int $colorIndex) : array
     {
         $color = imagecolorsforindex($img, $colorIndex);
@@ -962,14 +962,14 @@ 
         );
     }
         
-   /**
-    * Trims the specified image resource by removing the specified color.
-    * Also works with transparency.
-    * 
-    * @param resource $img
-    * @param array $color A color definition, as an associative array with red, green, blue and alpha keys. If not specified, the color at pixel position 0,0 will be used.
-    * @return ImageHelper
-    */
+    /**
+     * Trims the specified image resource by removing the specified color.
+     * Also works with transparency.
+     * 
+     * @param resource $img
+     * @param array $color A color definition, as an associative array with red, green, blue and alpha keys. If not specified, the color at pixel position 0,0 will be used.
+     * @return ImageHelper
+     */
     protected function trimImage($img, ?array $color=null) : ImageHelper
     {
         if($this->isVector()) {
@@ -1057,12 +1057,12 @@ 
         return $this;
     }
     
-   /**
-    * Sets the new image after a transformation operation:
-    * automatically adjusts the new size information.
-    * 
-    * @param resource $image
-    */
+    /**
+     * Sets the new image after a transformation operation:
+     * automatically adjusts the new size information.
+     * 
+     * @param resource $image
+     */
     protected function setNewImage($image)
     {
         self::requireResource($image);
@@ -1072,12 +1072,12 @@ 
         $this->newHeight= imagesy($image);
     }
     
-   /**
-    * Requires the subject to be a resource.
-    * 
-    * @param resource $subject
-    * @throws ImageHelper_Exception
-    */
+    /**
+     * Requires the subject to be a resource.
+     * 
+     * @param resource $subject
+     * @throws ImageHelper_Exception
+     */
     protected static function requireResource($subject)
     {
         if(is_resource($subject)) {
@@ -1094,14 +1094,14 @@ 
         );
     }
     
-   /**
-    * Creates a new image resource, with transparent background.
-    * 
-    * @param int $width
-    * @param int $height
-    * @throws ImageHelper_Exception
-    * @return resource
-    */
+    /**
+     * Creates a new image resource, with transparent background.
+     * 
+     * @param int $width
+     * @param int $height
+     * @throws ImageHelper_Exception
+     * @return resource
+     */
     protected function createNewImage(int $width, int $height)
     {
         $img = imagecreatetruecolor($width, $height);
@@ -1120,54 +1120,54 @@ 
         return $img;
     }
     
-   /**
-    * Whether the two specified colors are the same.
-    * 
-    * @param array $a
-    * @param array $b
-    * @return boolean
-    */
-	protected function colorsMatch($a, $b) : bool
-	{
-		$parts = array('red', 'green', 'blue');
-		foreach($parts as $part) {
-			if($a[$part] != $b[$part]) {
-				return false;
-			}
-		} 
+    /**
+     * Whether the two specified colors are the same.
+     * 
+     * @param array $a
+     * @param array $b
+     * @return boolean
+     */
+    protected function colorsMatch($a, $b) : bool
+    {
+        $parts = array('red', 'green', 'blue');
+        foreach($parts as $part) {
+            if($a[$part] != $b[$part]) {
+                return false;
+            }
+        } 
 		
-		return true;
-	}
+        return true;
+    }
 	
-	public function fillWhite($x=0, $y=0)
-	{
-	    $this->addRGBColor('white', 255, 255, 255);
+    public function fillWhite($x=0, $y=0)
+    {
+        $this->addRGBColor('white', 255, 255, 255);
         return $this->fill('white', $x, $y);
-	}
+    }
 	
-	public function fillTransparent() : ImageHelper
-	{
+    public function fillTransparent() : ImageHelper
+    {
         $this->enableAlpha();
 	    
-	    self::fillImageTransparent($this->newImage);
+        self::fillImageTransparent($this->newImage);
 	    
-	    return $this;
-	}
+        return $this;
+    }
 	
-	public static function fillImageTransparent($resource)
-	{
-	    self::requireResource($resource);
+    public static function fillImageTransparent($resource)
+    {
+        self::requireResource($resource);
 	    
-	    $transparent = imagecolorallocatealpha($resource, 89, 14, 207, 127);
-	    imagecolortransparent ($resource, $transparent);
-	    imagefill($resource, 0, 0, $transparent);
-	}
+        $transparent = imagecolorallocatealpha($resource, 89, 14, 207, 127);
+        imagecolortransparent ($resource, $transparent);
+        imagefill($resource, 0, 0, $transparent);
+    }
 	
-	public function fill($colorName, $x=0, $y=0)
-	{
-	    imagefill($this->newImage, $x, $y, $this->colors[$colorName]);
-	    return $this;
-	}
+    public function fill($colorName, $x=0, $y=0)
+    {
+        imagefill($this->newImage, $x, $y, $this->colors[$colorName]);
+        return $this;
+    }
 	
     protected $colors = array();
 
@@ -1188,9 +1188,9 @@ 
         return $this;
     }
     
-   /**
-    * @return resource
-    */
+    /**
+     * @return resource
+     */
     public function getImage()
     {
         return $this->newImage;
@@ -1208,27 +1208,27 @@ 
         return $this;
     }
     
-   /**
-    * Retrieves the size of the image.
-    * 
-    * @param bool $exception Whether to trigger an exception when the image does not exist
-    * @return ImageHelper_Size
-    * @throws ImageHelper_Exception
-    * @see ImageHelper::ERROR_CANNOT_GET_IMAGE_SIZE
-    */
-	public function getSize() : ImageHelper_Size
+    /**
+     * Retrieves the size of the image.
+     * 
+     * @param bool $exception Whether to trigger an exception when the image does not exist
+     * @return ImageHelper_Size
+     * @throws ImageHelper_Exception
+     * @see ImageHelper::ERROR_CANNOT_GET_IMAGE_SIZE
+     */
+    public function getSize() : ImageHelper_Size
     {
-	    return self::getImageSize($this->newImage);
+        return self::getImageSize($this->newImage);
     }
     
     protected $TTFFile;
     
-   /**
-    * Sets the TTF font file to use for text operations.
-    * 
-    * @param string $filePath
-    * @return ImageHelper
-    */
+    /**
+     * Sets the TTF font file to use for text operations.
+     * 
+     * @param string $filePath
+     * @return ImageHelper
+     */
     public function setFontTTF($filePath)
     {
         $this->TTFFile = $filePath;
@@ -1300,63 +1300,63 @@ 
             return;
         }
         
-	    throw new ImageHelper_Exception(
+        throw new ImageHelper_Exception(
             'No true type font specified',
             'This functionality requires a TTF font file to be specified with the [setFontTTF] method.',
             self::ERROR_NO_TRUE_TYPE_FONT_SET    
         );
     }
     
-   /**
-	 * Retrieves the size of an image file on disk, or
-	 * an existing image resource.
-	 *
-	 * <pre>
-	 * array(
-	 *     0: (width),
-	 *     1: (height),
-	 *     "channels": the amount of channels
-	 *     "bits": bits per channel
+    /**
+     * Retrieves the size of an image file on disk, or
+     * an existing image resource.
+     *
+     * <pre>
+     * array(
+     *     0: (width),
+     *     1: (height),
+     *     "channels": the amount of channels
+     *     "bits": bits per channel
      * )     
-	 * </pre>
-	 *
-	 * @param string|resource $pathOrResource
-	 * @return ImageHelper_Size Size object, can also be accessed like the traditional array from getimagesize
-	 * @see ImageHelper_Size
-	 * @throws ImageHelper_Exception
-	 * @see ImageHelper::ERROR_CANNOT_GET_IMAGE_SIZE
-	 * @see ImageHelper::ERROR_CANNOT_READ_SVG_IMAGE
-	 * @see ImageHelper::ERROR_SVG_SOURCE_VIEWBOX_MISSING
-	 * @see ImageHelper::ERROR_SVG_VIEWBOX_INVALID
-	 */
-	public static function getImageSize($pathOrResource) : ImageHelper_Size
-	{
-	    if(is_resource($pathOrResource)) 
-	    {
-	        return new ImageHelper_Size(array(
-	            'width' => imagesx($pathOrResource),
-	            'height' => imagesy($pathOrResource),
-	            'channels' => 1,
-	            'bits' => 8
-	        ));
-	    }
+     * </pre>
+     *
+     * @param string|resource $pathOrResource
+     * @return ImageHelper_Size Size object, can also be accessed like the traditional array from getimagesize
+     * @see ImageHelper_Size
+     * @throws ImageHelper_Exception
+     * @see ImageHelper::ERROR_CANNOT_GET_IMAGE_SIZE
+     * @see ImageHelper::ERROR_CANNOT_READ_SVG_IMAGE
+     * @see ImageHelper::ERROR_SVG_SOURCE_VIEWBOX_MISSING
+     * @see ImageHelper::ERROR_SVG_VIEWBOX_INVALID
+     */
+    public static function getImageSize($pathOrResource) : ImageHelper_Size
+    {
+        if(is_resource($pathOrResource)) 
+        {
+            return new ImageHelper_Size(array(
+                'width' => imagesx($pathOrResource),
+                'height' => imagesy($pathOrResource),
+                'channels' => 1,
+                'bits' => 8
+            ));
+        }
 	    
-	    $type = self::getFileImageType($pathOrResource);
+        $type = self::getFileImageType($pathOrResource);
 	    
-	    $info = false;
-	    $method = 'getImageSize_'.$type;
-	    if(method_exists(__CLASS__, $method)) 
-	    {
-	        $info = call_user_func(array(__CLASS__, $method), $pathOrResource);
-	    } 
-	    else 
-	    {
-	        $info = getimagesize($pathOrResource);
-	    }
+        $info = false;
+        $method = 'getImageSize_'.$type;
+        if(method_exists(__CLASS__, $method)) 
+        {
+            $info = call_user_func(array(__CLASS__, $method), $pathOrResource);
+        } 
+        else 
+        {
+            $info = getimagesize($pathOrResource);
+        }
 	    
-	    if($info !== false) {
-	        return new ImageHelper_Size($info);
-	    }
+        if($info !== false) {
+            return new ImageHelper_Size($info);
+        }
 	    
         throw new ImageHelper_Exception(
             'Error opening image file',
@@ -1366,96 +1366,96 @@ 
             ),
             self::ERROR_CANNOT_GET_IMAGE_SIZE
         );
-	}
+    }
 	
-   /**
-    * @param string $imagePath
-    * @throws ImageHelper_Exception
-    * @return array
-    * 
-    * @todo This should return a ImageHelper_Size instance.
-    */
-	protected static function getImageSize_svg(string $imagePath) : array
-	{
-	    $xml = XMLHelper::createSimplexml();
-	    $xml->loadFile($imagePath);
+    /**
+     * @param string $imagePath
+     * @throws ImageHelper_Exception
+     * @return array
+     * 
+     * @todo This should return a ImageHelper_Size instance.
+     */
+    protected static function getImageSize_svg(string $imagePath) : array
+    {
+        $xml = XMLHelper::createSimplexml();
+        $xml->loadFile($imagePath);
 	    
-	    if($xml->hasErrors()) {
-	        throw new ImageHelper_Exception(
-	            'Error opening SVG image',
-	            sprintf(
-	                'The XML content of the image [%s] could not be parsed.',
-	                $imagePath
+        if($xml->hasErrors()) {
+            throw new ImageHelper_Exception(
+                'Error opening SVG image',
+                sprintf(
+                    'The XML content of the image [%s] could not be parsed.',
+                    $imagePath
                 ),
-	            self::ERROR_CANNOT_READ_SVG_IMAGE
+                self::ERROR_CANNOT_READ_SVG_IMAGE
             );
-	    }
+        }
 	    
-	    $data = $xml->toArray();
-	    $xml->dispose();
-	    unset($xml);
+        $data = $xml->toArray();
+        $xml->dispose();
+        unset($xml);
 	    
-	    if(!isset($data['@attributes']) || !isset($data['@attributes']['viewBox'])) {
-	        throw new ImageHelper_Exception(
-	            'SVG Image is corrupted',
-	            sprintf(
-	                'The [viewBox] attribute is missing in the XML of the image at path [%s].',
-	                $imagePath
+        if(!isset($data['@attributes']) || !isset($data['@attributes']['viewBox'])) {
+            throw new ImageHelper_Exception(
+                'SVG Image is corrupted',
+                sprintf(
+                    'The [viewBox] attribute is missing in the XML of the image at path [%s].',
+                    $imagePath
                 ),
-	            self::ERROR_SVG_SOURCE_VIEWBOX_MISSING
+                self::ERROR_SVG_SOURCE_VIEWBOX_MISSING
             );
-	    }
+        }
 	    
-	    $svgWidth = parseNumber($data['@attributes']['width'])->getNumber();
-	    $svgHeight = parseNumber($data['@attributes']['height'])->getNumber();
+        $svgWidth = parseNumber($data['@attributes']['width'])->getNumber();
+        $svgHeight = parseNumber($data['@attributes']['height'])->getNumber();
 	    
-	    $viewBox = str_replace(' ', ',', $data['@attributes']['viewBox']);
-	    $viewBox = explode(',', $viewBox);
-	    if(count($viewBox) != 4) {
-	        throw new ImageHelper_Exception(
-	            'SVG image has an invalid viewBox attribute',
-	            sprintf(
-	               'The [viewBox] attribute does not have an expected value: [%s] in path [%s].',
-	                $viewBox,
-	                $imagePath
+        $viewBox = str_replace(' ', ',', $data['@attributes']['viewBox']);
+        $viewBox = explode(',', $viewBox);
+        if(count($viewBox) != 4) {
+            throw new ImageHelper_Exception(
+                'SVG image has an invalid viewBox attribute',
+                sprintf(
+                    'The [viewBox] attribute does not have an expected value: [%s] in path [%s].',
+                    $viewBox,
+                    $imagePath
                 ),
-	            self::ERROR_SVG_VIEWBOX_INVALID
+                self::ERROR_SVG_VIEWBOX_INVALID
             );
-	    }
+        }
 	    
-	    $boxWidth = $viewBox[2];
-	    $boxHeight = $viewBox[3];
+        $boxWidth = $viewBox[2];
+        $boxHeight = $viewBox[3];
 	    
-	    // calculate the x and y units of the document: 
-	    // @see http://tutorials.jenkov.com/svg/svg-viewport-view-box.html#viewbox
-	    //
-	    // The viewbox combined with the width and heigt of the svg
-	    // allow calculating how many pixels are in one unit of the 
-	    // width and height of the document.
+        // calculate the x and y units of the document: 
+        // @see http://tutorials.jenkov.com/svg/svg-viewport-view-box.html#viewbox
+        //
+        // The viewbox combined with the width and heigt of the svg
+        // allow calculating how many pixels are in one unit of the 
+        // width and height of the document.
         //
-	    $xUnits = $svgWidth / $boxWidth;
-	    $yUnits = $svgHeight / $boxHeight;
+        $xUnits = $svgWidth / $boxWidth;
+        $yUnits = $svgHeight / $boxHeight;
 	    
-	    $pxWidth = $xUnits * $svgWidth;
-	    $pxHeight = $yUnits * $svgHeight;
+        $pxWidth = $xUnits * $svgWidth;
+        $pxHeight = $yUnits * $svgHeight;
 	    
-	    return array(
-	        $pxWidth,
-	        $pxHeight,
-	        'bits' => 8
-	    );
-	}
+        return array(
+            $pxWidth,
+            $pxHeight,
+            'bits' => 8
+        );
+    }
 	
-	/**
-    * Crops the image to the specified width and height, optionally
-    * specifying the origin position to crop from.
-    * 
-    * @param integer $width
-    * @param integer $height
-    * @param integer $x
-    * @param integer $y
-    * @return ImageHelper
-    */
+    /**
+     * Crops the image to the specified width and height, optionally
+     * specifying the origin position to crop from.
+     * 
+     * @param integer $width
+     * @param integer $height
+     * @param integer $x
+     * @param integer $y
+     * @return ImageHelper
+     */
     public function crop(int $width, int $height, int $x=0, int $y=0) : ImageHelper
     {
         $new = $this->createNewImage($width, $height);
@@ -1477,14 +1477,14 @@ 
         return $this->newHeight;
     }
 
-   /**
-    * Calculates the average color value used in 
-    * the image. Returns an associative array
-    * with the red, green, blue and alpha components.
-    * 
-    * @param int $format The format in which to return the color value.
-    * @return array|string
-    */
+    /**
+     * Calculates the average color value used in 
+     * the image. Returns an associative array
+     * with the red, green, blue and alpha components.
+     * 
+     * @param int $format The format in which to return the color value.
+     * @return array|string
+     */
     public function calcAverageColor(int $format=self::COLORFORMAT_RGB)
     {
         $image = $this->duplicate();
@@ -1507,18 +1507,18 @@ 
     
     const COLORFORMAT_HEX = 2;
     
-   /**
-    * Retrieves the color value at the specified pixel
-    * coordinates in the image.
-    * 
-    * @param int $x
-    * @param int $y
-    * @param int $format The format in which to return the color value.
-    * @return array|string
-    * 
-    * @see ImageHelper::COLORFORMAT_RGB
-    * @see ImageHelper::COLORFORMAT_HEX
-    */
+    /**
+     * Retrieves the color value at the specified pixel
+     * coordinates in the image.
+     * 
+     * @param int $x
+     * @param int $y
+     * @param int $format The format in which to return the color value.
+     * @return array|string
+     * 
+     * @see ImageHelper::COLORFORMAT_RGB
+     * @see ImageHelper::COLORFORMAT_HEX
+     */
     public function getColorAt(int $x, int $y, int $format=self::COLORFORMAT_RGB)
     {
         if($x > $this->getWidth() || $y > $this->getHeight()) 
@@ -1546,21 +1546,21 @@ 
         return $rgb;
     }
     
-   /**
-    * Converts an RGB value to its luminance equivalent.
-    * 
-    * @param array $rgb
-    * @return integer Integer, from 0 to 255 (0=black, 255=white)
-    */
+    /**
+     * Converts an RGB value to its luminance equivalent.
+     * 
+     * @param array $rgb
+     * @return integer Integer, from 0 to 255 (0=black, 255=white)
+     */
     public static function rgb2luma($rgb)
     {
         return (($rgb['red']*2)+$rgb['blue']+($rgb['green']*3))/6;
     }
     
-   /**
-    * Retrieves the brightness of the image, in percent.
-    * @return number
-    */
+    /**
+     * Retrieves the brightness of the image, in percent.
+     * @return number
+     */
     public function getBrightness()
     {
         $luma = self::rgb2luma($this->calcAverageColor());
@@ -1568,15 +1568,15 @@ 
         return $percent;
     }
     
-   /**
-    * Retrieves an md5 hash of the source image file.
-    * 
-    * NOTE: Only works when the helper has been created
-    * from a file. Otherwise an exception is thrown.
-    * 
-    * @return string
-    * @throws ImageHelper_Exception
-    */
+    /**
+     * Retrieves an md5 hash of the source image file.
+     * 
+     * NOTE: Only works when the helper has been created
+     * from a file. Otherwise an exception is thrown.
+     * 
+     * @return string
+     * @throws ImageHelper_Exception
+     */
     public function getHash()
     {
         ob_start();