transform.php

完美的在线教育系统

<?php
/***********************************************************************
** Title.........:  Image Transformation Interface
** Version.......:  1.0
** Author........:  Xiang Wei ZHUO <[e-mail]>
** Filename......:  Transform.php
** Last changed..:  30 Aug 2003 
** Notes.........:  Orginal is from PEAR
                    
                    Added a few extra,
                        - create unique filename in a particular directory,
                          used for temp image files.
                        - added cropping to GD, NetPBM, ImageMagick
**/

// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Peter Bowyer <[e-mail]>                      |
// |          Alan Knowles <[e-mail]>                            |
// |          Vincent Oostindie <[e-mail]>              |
// +----------------------------------------------------------------------+
//
// $Id: Transform.php 26 2004-03-31 02:35:21Z Wei Zhuo $
//
// Image Transformation interface
//


/**
 * The main "Image_Resize" class is a container and base class which
 * provides the static methods for creating Image objects as well as
 * some utility functions (maths) common to all parts of Image Resize.
 *
 * The object model of DB is as follows (indentation means inheritance):
 *
 * Image_Resize The base for each Image implementation.  Provides default
 * |            implementations (in OO lingo virtual methods) for
 * |            the actual Image implementations as well as a bunch of
 * |            maths methods.
 * |
 * +-Image_GD   The Image implementation for the PHP GD extension .  Inherits
 *              Image_Resize
 *              When calling DB::setup for GD images the object returned is an
 *              instance of this class.
 *
 * @package  Image Resize
 * @version  1.00
 * @author   Peter Bowyer <[e-mail]>
 * @since    PHP 4.0
 */
Class Image_Transform
{
    /**
     * Name of the image file
     * @var string
     */
    var $image = '';
    /**
     * Type of the image file (eg. jpg, gif png ...)
     * @var string
     */
    var $type = '';
    /**
     * Original image width in x direction
     * @var int
     */
    var $img_x = '';
    /**
     * Original image width in y direction
     * @var int
     */
    var $img_y = '';
    /**
     * New image width in x direction
     * @var int
     */
    var $new_x = '';
    /**
     * New image width in y direction
     * @var int
     */
    var $new_y = '';
    /**
     * Path the the library used
     * e.g. /usr/local/ImageMagick/bin/ or
     * /usr/local/netpbm/
     */
    var $lib_path = '';
    /**
     * Flag to warn if image has been resized more than once before displaying
     * or saving.
     */
     var $resized = false;


     var $uid = '';

     var $lapse_time =900; //15 mins

    /**
     * Create a new Image_resize object
     *
     * @param string $driver name of driver class to initialize
     *
     * @return mixed a newly created Image_Transform object, or a PEAR
     * error object on error
     *
     * @see PEAR::isError()
     * @see Image_Transform::setOption()
     */
    function &factory($driver)
    {
        if ('' == $driver) {
            die("No image library specified... aborting.  You must call ::factory() with one parameter, the library to load.");

        }
        $this->uid = md5($_SERVER['REMOTE_ADDR']);

        include_once "$driver.php";

        $classname = "Image_Transform_Driver_{$driver}";
        $obj =& new $classname;
        return $obj;
    }


    /**
     * Resize the Image in the X and/or Y direction
     * If either is 0 it will be scaled proportionally
     *
     * @access public
     *
     * @param mixed $new_x (0, number, percentage 10% or 0.1)
     * @param mixed $new_y (0, number, percentage 10% or 0.1)
     *
     * @return mixed none or PEAR_error
     */
    function resize($new_x = 0, $new_y = 0)
    {
        // 0 means keep original size
        $new_x = (0 == $new_x) ? $this->img_x : $this->_parse_size($new_x, $this->img_x);
        $new_y = (0 == $new_y) ? $this->img_y : $this->_parse_size($new_y, $this->img_y);
        // Now do the library specific resizing.
        return $this->_resize($new_x, $new_y);
    } // End resize


    /**
     * Scale the image to have the max x dimension specified.
     *
     * @param int $new_x Size to scale X-dimension to
     * @return none
     */
    function scaleMaxX($new_x)
    {
        $new_y = round(($new_x / $this->img_x) * $this->img_y, 0);
        return $this->_resize($new_x, $new_y);
    } // End resizeX

    /**
     * Scale the image to have the max y dimension specified.
     *
     * @access public
     * @param int $new_y Size to scale Y-dimension to
     * @return none
     */
    function scaleMaxY($new_y)
    {
        $new_x = round(($new_y / $this->img_y) * $this->img_x, 0);
        return $this->_resize($new_x, $new_y);
    } // End resizeY

    /**
     * Scale Image to a maximum or percentage
     *
     * @access public
     * @param mixed (number, percentage 10% or 0.1)
     * @return mixed none or PEAR_error
     */
    function scale($size)
    {
        if ((strlen($size) > 1) && (substr($size,-1) == '%')) {
            return $this->scaleByPercentage(substr($size, 0, -1));
        } elseif ($size < 1) {
            return $this->scaleByFactor($size);
        } else {
            return $this->scaleByLength($size);
        }
    } // End scale

    /**
     * Scales an image to a percentage of its original size.  For example, if
     * my image was 640x480 and I called scaleByPercentage(10) then the image
     * would be resized to 64x48
     *
     * @access public
     * @param int $size Percentage of original size to scale to
     * @return none
     */
    function scaleByPercentage($size)
    {
        return $this->scaleByFactor($size / 100);
    } // End scaleByPercentage

    /**
     * Scales an image to a factor of its original size.  For example, if
     * my image was 640x480 and I called scaleByFactor(0.5) then the image
     * would be resized to 320x240.
     *
     * @access public
     * @param float $size Factor of original size to scale to
     * @return none
     */
    function scaleByFactor($size)
    {
        $new_x = round($size * $this->img_x, 0);
        $new_y = round($size * $this->img_y, 0);
        return $this->_resize($new_x, $new_y);
    } // End scaleByFactor

    /**
     * Scales an image so that the longest side has this dimension.
     *
     * @access public
     * @param int $size Max dimension in pixels
     * @return none
     */
    function scaleByLength($size)
    {
         if ($this->img_x >= $this->img_y) {
            $new_x = $size;
            $new_y = round(($new_x / $this->img_x) * $this->img_y, 0);
        } else {
            $new_y = $size;
            $new_x = round(($new_y / $this->img_y) * $this->img_x, 0);
        }
        return $this->_resize($new_x, $new_y);
    } // End scaleByLength


    /**
     *
     * @access public
     * @return void
     */
    function _get_image_details($image)
    {
        //echo $image;
        $data = @GetImageSize($image);
        #1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order), 8 = TIFF(motorola byte order,
        # 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC
        if (is_array($data)){
            switch($data[2]){
                case 1:
                    $type = 'gif';
                    break;
                case 2:
                    $type = 'jpeg';
                    break;
                case 3:
                    $type = 'png';
                    break;
                case 4:
                    $type = 'swf';
                    break;
                case 5:
                    $type = 'psd';
                case 6:
                    $type = 'bmp';
                case 7:
                case 8:
                    $type = 'tiff';
                default:
                    echo("We do not recognize this image format");