Writing text to images

DeadlySin3

I'm writing a script that generates thumbnails on demand and i've run into a slight problem..

I decided I wanted to write some text to the image using the GD Library.. Simple enough.

Now, when I thumbnail images, I scale them down proportionately. This is where my problem lies: I don't know exactly how large (or small!) each image will be..

What I've been trying to figure out is how do I pinpoint the very bottom of the image, or more specific, the bottom left corner of an image so I can write my text there?

Since they're all different sizes, the text i'm writing to some of the images gets cut off completely, whereas some shows up much higher than expected. Is there a simple way to figure this out? A tutorial written about this somewhere?

Any help on this matter is greatly appreciated!

-Paul

topsub

don't know if this works but when i have messed with images there is a function were u can grab information about the image and inside that is the width and the height. That would be were i start.

kburger

getimagesize()

DeadlySin3

I appreciate the replies!

After reading a particular section in Sam's Teach Yourself PHP in 24 Hours, I've learned how to (almost) precisely center text on an image of any size.

I've tried quite a few different ways to add text to the bottom right and left corners of an image of any size but I haven't been able to figure that one out just yet. Anybody have a pointer or two on how I can do this?

edit: a friend showed me the light: imagestring()

The code to draw text on an images bottom left corner is as follows

<?php
$max_width  = "125";
$max_height = "80";
$font = "Vera"; # Note the name & location here. Change as needed. Note the lack of the .ttf ext.
$text = "My text here";

# Set the enviroment variable for GD
putenv('GDFONTPATH=' . realpath('.'));
    $img = imagecreatetruecolor($max_width, $max_height);
    $red = imagecolorallocate($img, 255,0,0);

$textwidth = $max_width;
$textheight;
$fontsize = 15;

while ( true ) {
    $box = imageTTFbbox( $fontsize, 0, $font, $text );
    $textwidth = abs( $box[2] );
    $textbodyheight = ( abs($box[7]) )-2;
    if ( $textwidth < $max_width -20 )
        break;
    $fontsize--;
}

# Determine the approx. center point
/*
    $pngXcenter = (int) ( $max_width/2 );
    $pngYcenter = (int) ( $max_height/2 );
    imageTTFtext( $img, $fontsize, 0,
            (int) ($pngXcenter-($textwidth/2)),
            (int) ($pngYcenter+(($textbodyheight)/2) ),
            $red, $font, $text );
Uncomment this section if you want the text centered.
and comment out the imagestring function below
*/

imagestring($img, 5, 0, $max_height-$textbodyheight, $text, $red);

# Display the image
header("Content-type: image/png");
imagepng($img);
?>

DeadlySin3

As unbelievable as it may be.. i've been messing with different ways to do this for 3 days now.. with no luck. If I enter in the x and y axis variables manually, I can "guess" at where the bottom left or right should be and I can come pretty close on most images...

I'm beginning to wonder if this is even possible or if my simple mind just isn't able to comprehend how to do this.

Once I have the center position of the image pinpointed - mathematically, how would I go about finding the image corners?