<?php
Class Geo_Img_Resize {

    private $_image = null;
    
    
    function __construct($originalPath, $maxDim) {
        $this->process($originalPath, $maxDim);
    }
    
    private function process($path, $max) {
        $imageContent = file_get_contents($path);
        $image = imagecreatefromstring($imageContent);
        
        if ($image === false) {
            // Image corrupted
            return;
        }
        
        $imageHeight = imagesy($image);
        $imageWidth = imagesx($image);

        $newDim = null;
        
        if ($imageHeight > $imageWidth) {
            // Potrait
            $newDim = array(
                'height' => (int) $max,
                'width' =>  round($imageWidth * $max / $imageHeight)
            );
        } else {
            // Landscape
            $newDim = array(
                'height' => round($imageHeight * $max / $imageWidth),
                'width' => $max
            );
        }
       
        $newImage = imageCreateTrueColor($newDim['width'], $newDim['height']);
        
        imagecopyresized(
            $newImage, $image, 0,0,0,0,$newDim['width'],
            $newDim['height'],$imageWidth,$imageHeight
        );
        
        $this->_image = $newImage;
    }
    
    public function save($path) {
        if ($this->_image !== null) {
            imagepng($this->_image, $path);
        }
    }
    
    public function display() {
        imagepng($this->_image);
    }
}
?>