<?php
   # ==================================================================================#
   #  Author:    Jarrod Oberto
   #  Version:	 1.0
   #  Date:      17-Jan-10
   #  Usage Example:
   #                     include("classes/resize_class.php");
   #                     $resizeObj = new resize('images/cars/large/input.jpg');
   #                     $resizeObj -> resizeImage(150, 100, 0);
   #                     $resizeObj -> saveImage('images/cars/large/output.jpg', 100);
   # ==================================================================================#
   /**
    * /режимы: 1 - exact(по заданным height&width) 2 - portrait(fixed height) 3 - landscape(fixed width) 4 -auto(fixed heigth or width) 5 - crop
    */
   
	Class resize{
		// *** 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, $optimalHeight);
			imagecopyresampled($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);
			}
		}
			
		private 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{
					// *** Sqaure 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);
		}
	}
?>