Posts tagged resizing

<?php
 
/****************************************************
*
* Purpose: Photo Resizing Class
* Author:  Matt West, http://mattdanger.net
* Date:    January 12th, 2007
*
****************************************************/
 
class Photo {
 
    // Private variables
    private $orig_image;
    private $portrait_frame;    // 1 = Landscape, 2 = Portrait
    private $image_size;
    private $src_width;
    private $src_height;
    private $src_image;
    private $dest_height;
    private $dest_width;
    private $dest_image;
    private $ratio;
    private $scale;
 
    // Public variables
    public $allowed_types = array('jpeg', 'jpg', 'png', 'gif');
 
    /**
     * Constructor:         Contruct the photo object
     * @param array $photo  Array of photo data, usually $_FILES['photo_name']
     */
    public function __construct($photo) {
 
        $this->photo($photo);
 
    }
 
    /**
     * photo():             Create new image resource
     * @param string $photo Array of photo data
     */
    public function photo($photo) {
 
        $this->orig_image = $photo;
 
        // Confirm photo is an allowed type;
        if ( !in_array(ereg_replace('image/', '', $this->orig_image['type']), $this->allowed_types) ) {
 
            exit("Photo type is '" . $this->orig_image['type'] . "' which is not allowed");
 
        }
 
        // Get image X and Y values in order to determine photo framing
        $this->image_size = getimagesize($this->orig_image['tmp_name']);
        $this->src_width = $this->image_size[0];
        $this->src_height = $this->image_size[1];
        $this->dest_height = 0;
 
        // 1 = Landscape, 2 = Portrait
        $this->photo_framing = ($this->src_width > $this->src_height) ? 1 : 2 ;
 
        // Calculate the ratio at which to resize based on the dimentions
        $this->ratio = $this->src_width / $this->src_height;
 
    }
 
    /**
     * scale_to_width():    Sets the width of the resize value
     * @param int $width    Width in pixels
     * @returns boolean     Returns true if successful, false if it was not.
     */
    public function scale_to_width($width) {
 
        // Set the destination width value
        $this->dest_width = $width;
 
        // Calculate the value at which to scale the image
        $this->scale = ($this->ratio) ? $this->dest_width / $this->src_width : $this->dest_height / $this->src_height; 
 
        if ($this->scale_image()) {
 
            return true;
 
        } else {
 
            return false;
 
        }
 
    }
 
    /**
     * scale_to_height():   Sets the height of the resize value
     * @param int $height   Height in pixels
     * @returns boolean     Returns true if successful, false if it was not.
     */
    public function scale_to_height($height) {
 
        // Set the destination height value
        $this->dest_height = $height;
 
        // Calculate the ratio at which to resize based on the dimentions
        $this->ratio = $this->src_width / $this->src_height;
 
        // Calculate the value at which to scale the image
        $this->scale = ($this->ratio) ? $this->dest_height / $this->src_height : $this->dest_width / $this->src_width ; 
 
        if ($this->scale_image()) {
 
            return true;
 
        } else {
 
            return false;
 
        }
 
    }
 
    /**
     * scale_image():   Resize image proportionally
     * @returns boolean Returns true if successful, false if it was not.
     */
    private function scale_image () {
 
        if ($this->scale > 1) {
 
            exit ("The scale width supplied is larger than the original image. Please try a smaller number.");
 
        }
 
        $this->dest_width = $this->src_width * $this->scale;
        $this->dest_height = $this->src_height * $this->scale;
 
        if ( $this->dest_width >= $this->src_width && $this->dest_width >= $this->src_width ) $this->scale = 1;
 
        $this->src_image = imagecreatefromjpeg ($this->orig_image['tmp_name']);
 
        $this->dest_image = imagecreatetruecolor ($this->src_width * $this->scale, $this->src_height * $this->scale);
 
        if ( imagecopyresampled(   $this->dest_image, 
                                    $this->src_image, 
                                    0, 0, 0, 0, 
                                    $this->dest_width, 
                                    $this->dest_height, 
                                    $this->src_width, 
                                    $this->src_height) ) { 
 
            return true;
 
        } else {
 
            return false;
 
        }
 
    }
 
    /**
     * save_photo():            Saves the resized photo
     * @param string $filename  The path and filename to save the file (ex: "/path/to/image.jpg")
     * @param int $compression  A number from 1-100 representing the level of compression. 100 is the least compression.
     * @returns boolean         Returns true if save was successful, false if it was not.
     */
    public function save_photo ($filename, $compression = 80) {
 
        if ( imagejpeg($this->dest_image, $filename, $compression) ) {
 
            $return_value = true;
 
        } else {
 
            $return_value = false;
 
        }
 
        imagedestroy($this->src_image);
        imagedestroy($this->dest_image);
        return $return_value;
 
    }
 
}
 
?>