Beiträge von danielo007

<?php
if(!class_exists('Image_Resizer')):




	class Image_Resizer {
		
		// *** Class variables
		private $image;
		private $width;
		private $height;
		private $imageResized;




		function __construct($fileName)
		{
			// *** Open up the file
			$this->image = $this->openImage($fileName);




			// *** Get width and height
			$this->width  = imagesx($this->image);
			$this->height = imagesy($this->image);
		}




		private function openImage($file)
		{
			// *** Get extension
			$extension = strtolower(strrchr($file, '.'));




			switch($extension)
			{
				case '.jpg':
				case '.jpeg':
					$img = @imagecreatefromjpeg($file);
					break;
				case '.gif':
					$img = @imagecreatefromgif($file);
					break;
				case '.png':
					$img = @imagecreatefrompng($file);
					break;
				default:
					$img = false;
					break;
			}
			return $img;
		}




		public function resizeImage($newWidth, $newHeight, $option="auto")
		{
			// *** Get optimal width and height - based on $option
			$optionArray = $this->getDimensions($newWidth, $newHeight, $option);




			$optimalWidth  = $optionArray['optimalWidth'];
			$optimalHeight = $optionArray['optimalHeight'];








			// *** Resample - create image canvas of x, y size
			$this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
			/*** Preserve PNG transparency start ***/
			imagealphablending($this->imageResized, false); 
			imagesavealpha($this->imageResized, true);
			$transparent = imagecolorallocatealpha($this->imageResized, 255, 255, 255, 127);
			imagefilledrectangle($this->imageResized, 0, 0, $optimalWidth, $optimalHeight, $transparent);
			/*** Preserve PNG transparency end ***/
			imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);








			// *** if option is 'crop', then crop too
			if ($option == 'crop') {
				$this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
			}
		}




		public function getDimensions($newWidth, $newHeight, $option)
		{




		   switch ($option)
			{
				case 'exact':
					$optimalWidth = $newWidth;
					$optimalHeight= $newHeight;
					break;
				case 'portrait':
					$optimalWidth = $this->getSizeByFixedHeight($newHeight);
					$optimalHeight= $newHeight;
					break;
				case 'landscape':
					$optimalWidth = $newWidth;
					$optimalHeight= $this->getSizeByFixedWidth($newWidth);
					break;
				case 'auto':
					$optionArray = $this->getSizeByAuto($newWidth, $newHeight);
					$optimalWidth = $optionArray['optimalWidth'];
					$optimalHeight = $optionArray['optimalHeight'];
					break;
				case 'crop':
					$optionArray = $this->getOptimalCrop($newWidth, $newHeight);
					$optimalWidth = $optionArray['optimalWidth'];
					$optimalHeight = $optionArray['optimalHeight'];
					break;
			}
			return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
		}




		private function getSizeByFixedHeight($newHeight)
		{
			$ratio = $this->width / $this->height;
			$newWidth = $newHeight * $ratio;
			return $newWidth;
		}




		private function getSizeByFixedWidth($newWidth)
		{
			$ratio = $this->height / $this->width;
			$newHeight = $newWidth * $ratio;
			return $newHeight;
		}




		private function getSizeByAuto($newWidth, $newHeight)
		{
			if ($this->height < $this->width)
			// *** Image to be resized is wider (landscape)
			{
				$optimalWidth = $newWidth;
				$optimalHeight= $this->getSizeByFixedWidth($newWidth);
			}
			elseif ($this->height > $this->width)
			// *** Image to be resized is taller (portrait)
			{
				$optimalWidth = $this->getSizeByFixedHeight($newHeight);
				$optimalHeight= $newHeight;
			}
			else
			// *** Image to be resizerd is a square
			{
				if ($newHeight < $newWidth) {
					$optimalWidth = $newWidth;
					$optimalHeight= $this->getSizeByFixedWidth($newWidth);
				} else if ($newHeight > $newWidth) {
					$optimalWidth = $this->getSizeByFixedHeight($newHeight);
					$optimalHeight= $newHeight;
				} else {
					// *** Square being resized to a square
					$optimalWidth = $newWidth;
					$optimalHeight= $newHeight;
				}
			}




			return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
		}




		private function getOptimalCrop($newWidth, $newHeight)
		{




			$heightRatio = $this->height / $newHeight;
			$widthRatio  = $this->width /  $newWidth;




			if ($heightRatio < $widthRatio) {
				$optimalRatio = $heightRatio;
			} else {
				$optimalRatio = $widthRatio;
			}




			$optimalHeight = $this->height / $optimalRatio;
			$optimalWidth  = $this->width  / $optimalRatio;




			return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
		}




		private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
		{
			// *** Find center - this will be used for the crop
			$cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );
			$cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );




			$crop = $this->imageResized;
			//imagedestroy($this->imageResized);




			// *** Now crop from center to exact requested size
			$this->imageResized = imagecreatetruecolor($newWidth , $newHeight);
			imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);
		}




		public function saveImage($savePath, $imageQuality="100")
		{
			// *** Get extension
			$extension = strrchr($savePath, '.');
			$extension = strtolower($extension);




			switch($extension)
			{
				case '.jpg':
				case '.jpeg':
					if (imagetypes() & IMG_JPG) {
						imagejpeg($this->imageResized, $savePath, $imageQuality);
					}
					break;




				case '.gif':
					if (imagetypes() & IMG_GIF) {
						imagegif($this->imageResized, $savePath);
					}
					break;




				case '.png':
					// *** Scale quality from 0-100 to 0-9
					$scaleQuality = round(($imageQuality/100) * 9);




					// *** Invert quality setting as 0 is best, not 9
					$invertScaleQuality = 9 - $scaleQuality;




					if (imagetypes() & IMG_PNG) {
						 imagepng($this->imageResized, $savePath, $invertScaleQuality);
					}
					break;




				// ... etc




				default:
					// *** No extension - No save.
					break;
			}




			imagedestroy($this->imageResized);
		}




	}




endif;