GD Image Functions

[hearn]

Does anyone have some good code to give me for this:

I want to be able to open a set of images from an array, compress them and output them as an image to the browser.

Later on I'm going to set it up so a user can rotate them and so forth.

Any ideas?

Thanks in advance!
Cheers,
Tom

[feldon23]

When someone asks for an entire script from scratch, they rarely get a finished bug-free script handed to them. Why? Because programming is work and work usually = money. 🙂

If you had some questions about a script you are working on and need a nudge in the right direction, I'm sure you would get some good responses.

[hearn]

Thanks for the informational tips, but I know what programming is.

I AM asking for some code and not an entire script.

Compression in GD is done through the function, not by writing an entire script. All I'm asking for is two or three lines of code because I couldn't get it to work.

[feldon23]

Could you post some of your code?

When you say an array, the array is filenames or the entire data of the image?

Realize that .GIF is not supported by GD.

To spit out a processed image, you should be able to just do something like:

<img src="processimage.php?do=compress&filename=DSCF4029.jpg">

Note that some browsers don't like this.

[hearn]

This is kinda long I know but this is the entire dynamic page:

<?
    include("connect.php");
    $query = "SELECT * FROM settings";
    if(!$connection->doQuery($query)) {
        echo $connection->showStatus();
        die;
    }
    $settings = $connection->GetData();

$gallery = $settings["gallery"];

$query = "SELECT * FROM galleries WHERE id=$gallery";
if(!$connection->doQuery($query)) {
    echo $connection->showStatus();
    die;
}
$current = $connection->GetData();  

if (!empty($gallery)) {
    $counter=1;
    if ($handle = opendir($path . $current["id"] . "_" . $current["title"])) {
        while (false !== ($file = readdir($handle))) {
            if ($file!="." && $file!="..") {
                $image[$counter]=$file;
                $counter++;
            }
        }
        closedir($handle);
    }
    $total = sizeof($image);

    echo "<TABLE WIDTH=\"100%\" BORDER=\"0\" CELLPADDING=\"0\" CELLSPACING=\"0\">\n";
    echo "<TR>\n";
    echo "<TD ALIGN=\"LEFT\"><B>Gallery Of " . $current["title"] . " ($total Pictures Total)</B></TD>\n";
    echo "<TD ALIGN=\"RIGHT\"><B>Event Date Of " . date("l, F jS, Y", $current["date"]) . "</B></TD>\n";
    echo "</TR>\n";
    echo "</TABLE>\n";
    echo "<HR WIDTH=\"100%\" COLOR=\"000000\">\n";

    if ($total>0) {
        if (empty($start)) {
            $start=1;
        }
        if (empty($end)) {
            if ($settings["perpage"]>$total) {
                $end=$total;
            } else {
                $end = $settings["perpage"];
            }
        }

        echo "<CENTER>\n";
        echo "<TABLE>\n";
        $offset=0;
        for ($a=$start; $a<=$end; $a++) {
            if ($offset==0) {
                echo "<TR>";
            }
            //$src_img = imagecreatefromJPEG($path . $current["id"] . "_" . $current["title"] . "/" . $image[$a]) or die("Failed to create image");
            $compression = 80;
            $new_height = 100;
            $new_width = 100;
            $dst_img = imagecreatetruecolor($new_width,$new_height);
            $image = imagejpeg($path . $current["id"] . "_" . $current["title"] . "/" . $image[$a], 0, $compression) or die("Died on call to imagejpeg() function");

            echo "<TD><IMG SRC=\"$image\" WIDTH=\"100\"></TD>\n";
            if ($offset==1) {
                echo "</TR>\n";
                $offset=0;
            } else {
                $offset++;
            }
        }
        echo "</TABLE>\n";
        $start=1;
        $printcounter=$total;
        $increment=$settings["perpage"];
        for ($a=$start; $a<=$total; $a+=$increment) {
            if ($total-$a<$increment) {
                $b=$total-$a;
            } else {
                $b=$increment-1;
            }
            echo "[ <A HREF=\"?start=$a&end=" . ($a+$b) . "\">$a - " . ($a+$b) . "</A> ]\n";
            $printcounter-=$b;
        }

        echo "</CENTER>\n";
    } else {
        echo "There are currently no photos in this gallery.";
    }
} else {
    echo "<B>A gallery has currently not been selected.  Please ask the system administrator to do so.</B>\n";
    echo "<BR /><BR />\n";
}
?>

[feldon23]

I'll have to ignore the MySQL bits cause I don't know MySQL.

There's a bit of waste/confusion with $counter and $total. Just use count($image) everywhere you need the # of images.

Let's use:

        if ($handle = opendir($path . $current["id"] . "_" . $current["title"])) { 
            while (false !== ($file = readdir($handle))) { 
                if ($file!="." && $file!="..") { 
                    $image[]=$file; 
                } 
            } 
            closedir($handle); 
        }

Also, you are using globals like $perpage instead of $_GET['perpage'] which makes the code a bit harder to follow.

I see a big problem!

$image is your big array of all the files in one directory. Yet you are replacing that array with the guts of a single image here:

$image = imagejpeg($path . $current["id"] . "_" . $current["title"] . "/" . $image[$a]...

You are trying to pass a wad of data, a JPG, thru an IMG SRC tag:

echo "<TD><IMG SRC=\"$image\" WIDTH=\"100\"></TD>\n";

IMG SRC is supposed to be the FILENAME of a JPG, not the actual file data. You have two choices:

1. Write the JPG somewhere on the server temporarily and img src="tempdir\image.jpg".

2. Rework your script so it can call itself like:

<img src="imagehandler.php?action=dumpjpeg&name=DSCF0032.jpg">, then it will return just the image data.