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128 lines
5.0 KiB
128 lines
5.0 KiB
18 years ago
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<?php
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/*
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==============================================================================
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Dokeos - elearning and course management software
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Copyright (c) 2004 Dokeos S.A.
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Copyright (c) 2003 Ghent University (UGent)
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For a full list of contributors, see "credits.txt".
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The full license can be read in "license.txt".
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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See the GNU General Public License for more details.
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Contact: Dokeos, 181 rue Royale, B-1000 Brussels, Belgium, info@dokeos.com
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==============================================================================
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*/
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/**
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==============================================================================
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* @author Patrick Cool
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* @package dokeos.document
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* @todo convert comments to be understandable to phpDocumentor
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==============================================================================
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*/
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/*
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==============================================================================
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Developped by Patrick Cool
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patrick.cool@UGent.be
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Ghent University
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Mai 2004
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http://icto.UGent.be
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Please bear in mind that this is only an alpha release.
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I wrote this quite quick and didn't think too much about it in advance.
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It is not perfect at all but it is workable and usefull (I think)
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Do not consider this as a powerpoint replacement, although it has
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the same starting point.
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==============================================================================
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*/
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/*
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==============================================================================
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Description:
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This is a plugin for the documents tool. It looks for .jpg, .jpeg, .gif, .png
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files (since these are the files that can be viewed in a browser) and creates
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a slideshow with it by allowing to go to the next/previous image.
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You can also have a quick overview (thumbnail view) of all the images in
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that particular folder.
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Maybe it is important to notice that each slideshow is folder based. Only
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the images of the chosen folder are shown.
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This file has two large sections.
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1. code that belongs in document.php, but to avoid clutter I put the code here
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2. the function resize_image that handles the image resizing
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==============================================================================
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*/
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// ====================================================================================================
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// function resize_image($image, $target_width, $target_height, $slideshow=0)
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// ====================================================================================================
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// this functions calculates the resized width and resized heigt according to the source and target widths
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// and heights, height so that no distortions occur
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// parameters
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// $image = the absolute path to the image
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// $target_width = how large do you want your resized image
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// $target_height = how large do you want your resized image
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// $slideshow (default=0) = indicates weither we are generating images for a slideshow or not, t
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// this overrides the $_SESSION["image_resizing"] a bit so that a thumbnail
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// view is also possible when you choose not to resize the source images
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function resize_image($image, $target_width, $target_height, $slideshow=0)
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{
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// 1. grabbing the image height and width of the original image
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$image_properties=getimagesize($image);
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$source_width=$image_properties["0"];
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$source_height=$image_properties["1"];
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//print_r($image_properties);
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// 2. calculate the resize factor
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if ($_SESSION["image_resizing"]=="resizing" or $slideshow==1)
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{
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$resize_factor_width=$target_width/$source_width;
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$resize_factor_height=$target_height/$source_height;
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//echo $resize_factor_width."//".$resize_factor_height."<br>";
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} // if ($_SESSION["image_resizing"]=="resizing")
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// 4. calculate the resulting heigt and width
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if ($_SESSION["image_resizing"]=="resizing" or $slideshow==1)
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{
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if ($resize_factor_width<=1 and $resize_factor_height<=1)
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{
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if ($resize_factor_width > $resize_factor_height)
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{
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$image_width=$target_width;
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$image_height=ceil($source_height*$resize_factor_width);
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}
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if ($resize_factor_width < $resize_factor_height)
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{
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$image_width=ceil($source_width*$resize_factor_height);
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$image_height=$target_height;
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}
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else // both resize factors are equal
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{
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$image_width=ceil($source_width*$resize_factor_width);
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$image_height=ceil($source_height*$resize_factor_height);
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}
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//echo "image width=".$image_width."<br>";
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//echo "image height=".$image_height;
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} //if ($resize_factor_width<=1 and $resize_factor_height<=1)
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else // no resizing required
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{
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$image_width=$source_width;
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$image_height=$source_height;
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}
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} //if ($_SESSION["image_resizing"]=="resizing")
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// storing the resulting height and width in an array and returning it
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$image_height_width[]=$image_height;
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$image_height_width[]=$image_width;
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return $image_height_width;
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}
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?>
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