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<?php |
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/** |
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* Water mark |
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* Adds a watermark to an image |
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* |
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* @Author: Jens Kooij |
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* @Version: 1.0 |
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* @package: JNS MVC |
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* @Licence: http://creativecommons.org/licenses/by-nc-nd/3.0/ Attribution-NonCommercial-NoDerivs 3.0 Unported |
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*/ |
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namespace CloudControl\Cms\images\methods { |
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use CloudControl\Cms\images\Image; |
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use CloudControl\Cms\images\IMethod; |
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class Watermark extends IMethod |
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{ |
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protected $_x = 0; |
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protected $_y = 0; |
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protected $_transparency = 100; |
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/** |
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* @var Image |
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*/ |
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protected $_watermark; |
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protected function init() |
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{ |
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} |
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/** |
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* Sets transparency for watermark |
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* |
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* @param int $transparency |
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* @return self |
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*/ |
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public function SetTransparency($transparency) |
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{ |
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$this->_transparency = (int)$transparency; |
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return $this; |
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} |
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/** |
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* Use build-in logic to position the watermark |
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* |
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* @param string $x |
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* @param string $y |
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* @return self |
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*/ |
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public function SetPosition($x, $y) |
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{ |
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$this->SetX($x); |
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$this->SetY($y); |
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return $this; |
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} |
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/** |
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* Use build-in logic to position the x of watermark |
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* |
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* @param resource $imageResource |
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* @return int |
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* @throws \Exception |
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*/ |
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protected function calculateX($imageResource) |
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{ |
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if ((int)$this->_x === $this->_x) { |
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return $this->_x; |
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} |
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$x = strtolower($this->_x); |
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$imageWidth = imagesx($imageResource); |
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$watermarkWidth = imagesx($this->GetWatermark()->getImageResource()); |
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if ($x == 'left') { |
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$x = 0; |
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} elseif ($x == 'center') { |
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$x = $imageWidth / 2 - ($watermarkWidth / 2); |
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} elseif ($x == 'right') { |
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$x = $imageWidth - $watermarkWidth; |
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} |
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return (int)$x; |
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} |
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/** |
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* Use build-in logic to position the y of watermark |
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* |
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* @param resource $imageResource |
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* @return int |
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* @throws \Exception |
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*/ |
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public function calculateY($imageResource) |
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{ |
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if ((int)$this->_y === $this->_y) { |
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return $this->_y; |
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} |
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$y = strtolower($this->_y); |
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$imageHeight = imagesy($imageResource); |
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$watermarkHeight = imagesy($this->GetWatermark()->getImageResource()); |
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if ($y == 'top') { |
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$y = 0; |
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} elseif ($y == 'center') { |
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$y = $imageHeight / 2 - ($watermarkHeight / 2); |
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} elseif ($y == 'bottom') { |
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$y = $imageHeight - $watermarkHeight; |
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} |
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return (int)$y; |
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} |
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/** |
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* Sets the image that will be used as watermark |
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* |
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* @param Image $image |
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* @return Watermark |
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*/ |
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public function SetWatermark(Image $image) |
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{ |
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$this->_watermark = $image; |
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return $this; |
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} |
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/** |
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* Returns the watermark. |
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* Throws an Exception if it's not set or if it's not an \CloudControl\Cms\image\Image |
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* @return Image |
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* @throws \Exception |
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*/ |
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public function GetWatermark() |
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{ |
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if ($this->_watermark == null) { |
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throw new \Exception('A watermark is not set. Please supply a \CloudControl\Cms\image\Image using $this->SetWatermark'); |
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} |
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return $this->_watermark; |
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} |
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/** |
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* Set the x |
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* |
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* @param int | string $x |
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* @return self |
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*/ |
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public function SetX($x) |
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{ |
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$this->_x = $x; |
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return $this; |
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} |
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/** |
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* Set the y |
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* |
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* @param int | string $y |
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* @return self |
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*/ |
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public function SetY($y) |
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{ |
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$this->_y = $y; |
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return $this; |
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} |
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/** |
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* @param resource $imageResource |
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* @return resource |
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* @throws \Exception |
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*/ |
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public function Execute($imageResource) |
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{ |
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$watermark = $this->GetWatermark(); |
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$watermarkWidth = imagesx($watermark->getImageResource()); |
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$watermarkHeight = imagesy($watermark->getImageResource()); |
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$x = $this->calculateX($imageResource); |
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$y = $this->calculateY($imageResource); |
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$imageWidth = imagesx($imageResource); |
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$imageHeight = imagesy($imageResource); |
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$new = imagecreatetruecolor($imageWidth, $imageHeight); |
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// Preserve transparency of the image |
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imagecolortransparent($new, imagecolorallocatealpha($new, 0, 0, 0, 127)); |
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imagealphablending($new, false); |
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imagesavealpha($new, true); |
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// Preserve transparency of the watermark |
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imagecolortransparent($watermark->getImageResource(), |
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imagecolorallocatealpha($watermark->getImageResource(), 0, 0, 0, 127)); |
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imagealphablending($watermark->getImageResource(), false); |
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imagesavealpha($watermark->getImageResource(), true); |
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imagealphablending($new, true); |
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imagealphablending($watermark->getImageResource(), true); |
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imagecopy($new, $imageResource, 0, 0, 0, 0, $imageWidth, $imageHeight); |
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imagecopymerge($new, $watermark->getImageResource(), $x, $y, 0, 0, $watermarkWidth, $watermarkHeight, |
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$this->_transparency); |
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return $new; |
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} |
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} |
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} |