helpers/imageLibrary.php5

<?php

    /*
                Author: Monte D. Evans (mevans@shodor.org)
                Date: July 6, 2005
                All Rights Reserved

        This is a collection of PHP function that perform image manipulation
        task for an external source.  This function file provides means to
        create a thumbnail of an image, a collage of image, as well as to
        parse text out of a text file and to replace the default string
        with a an approriate destination file.

     */


function resize($originalImage, $width, $height, $dest = "", $name = "", $strict = false) {


    $imageData = @getimagesize($originalImage);

    $defaultWidth = $imageData[0];
    $defaultHeight = $imageData[1];

    if (@$imageData["bits"] != "") {
        $bits = $imageData["bits"];
    } else {
        $bits = 1;
    }

    if (@$imageData["channels"] != "") {
        $channel = $imageData["channels"];
    } else {
        $channel = 1;
    }

    $oriImageTemp = substr($originalImage, 0, strlen($originalImage ) - 4);
    $memoryNeeded = Round(($defaultWidth * $defaultHeight * $bits * $channel / 8 + Pow(2, 16)) * 1.65);
    $memoryNeeded .= "K";
    ini_set("memory_limit", "$memoryNeeded");

    if ($dest != "") {
        $pos = 0;
        $iArray = explode("/", $oriImageTemp);
            for ($j = 0; $j < count($iArray); $j++) {
                $pos++;
                }

            if ($name == "") {
                $name = $$iArray[$pos-1];
            }

            $oriImageTemp = ($dest . $name);
        } else {
            $oriImageTemp = $name . ".jpg";
        }

        if ($strict == false) {
            // In this implementation of the program we will set the new width to
            // be proportional to the height.  So, there is probably a more elegent
            // way of doing this, but here's how we do it.  We will take the original height
            // and subtract it from the new height and find the percent of change then we will
            // divide this change by the width of the new photo to get the resulting width

            $heightDifference = ($defaultHeight/$height);

            $width = (int)($defaultWidth/$heightDifference);

        }

         $im2 = ImageCreateTrueColor($width,$height);

        $image = ImageCreateFromJpeg($originalImage);


        //print ("location is $oriImageTemp\n");

        imagecopyResampled ($im2, $image, 0, 0, 0, 0, $width, $height, $defaultWidth, $defaultHeight);



        if (!ImageJpeg($im2, $oriImageTemp, 100)) {
            $oriImageTemp = ("/images/imgerr.jpg");
        }


    ImageDestroy($im2);
    ImageDestroy($image);


    return ($oriImageTemp);
}

function resizeStream($originalImage, $width, $height, $strict = false) {

    // The first thing we do is create an image from the string
    $im = ImageCreateFromString($originalImage);

    if (!$im)
        return (false);

    $originalWidth = imagesx($im);
    $originalHeight = imagesy($im);


    if ($strict == false) {
        // In this implementation of the program we will set the new width to
        // be proportional to the height.  So, there is probably a more elegent
        // way of doing this, but here's how we do it.  We will take the original height
        // and subtract it from the new height and find the percent of change then we will
        // divide this change by the width of the new photo to get the resulting width

        $heightDifference = ($originalHeight/$height);

        $width = (int)($originalWidth/$heightDifference);

    }

    $im2 = ImageCreateTrueColor($width,$height);

    @imagecopyResampled($im2, $im, 0, 0, 0, 0, $width, $height, $originalWidth, $originalHeight);

    ob_start(); // start a new output buffer
    imagejpeg($im2, NULL, 100);
    $output = ob_get_contents();
    ob_end_clean(); // stop this output buffer


    ImageDestroy($im);
    ImageDestroy($im2);

    return($output);

}


?>

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