#50971 [Opn->Fbk]: imagettftext/imagettfbbox return wrong coordinates if angle != 0

From: Date: Tue, 09 Feb 2010 09:53:59 +0000
Subject: #50971 [Opn->Fbk]: imagettftext/imagettfbbox return wrong coordinates if angle != 0
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-147353@lists.php.net to get a copy of this message 
 ID:               50971
 Updated by:       pajoye@php.net
 Reported By:      sks76543210 at gmail dot com
-Status:           Open
+Status:           Feedback
 Bug Type:         GD related
 Operating System: CentOS 5
 PHP Version:      5.3SVN-2010-02-09 (snap)
 New Comment:

Which GD library do you use? Bundled?


Previous Comments:
------------------------------------------------------------------------

[2010-02-09 06:39:41] sks76543210 at gmail dot com

Description:
------------
imagettftext() and imagettfbbox() both return wrong bounding box if the
angle is not set to 0. This sounds similar to a bug closed last year at
http://bugs.php.net/bug.php?id=43073

See http://www.yessum.org/gdbug2/ for font and samples.
This bug
appears to be in 5.1.6, and has since gotten worse in the latest svn. 

Also, in 5.3.3-dev, the text doesn't seem to even be on the same
baseline on many of the angles.

Reproduce code:
---------------
<?php
    $font = './cour.ttf'; // Courier New
    
    $im = imagecreatetruecolor(600, 600);
    
    imagefill($im, 0, 0, imagecolorallocate($im, 224, 224, 224));
    $black = imagecolorallocate($im, 0, 0, 0);
    $red = imagecolorallocate($im, 255, 0, 0);
    
    $angle = 0;
    do {
        $bbox = imagettftext($im, 16, $angle, 299, 299, $black, $font,
'The quick brown fox');
        imagepolygon($im, $bbox, 4, $red);
        $angle += 45;
    } while ($angle < 360);
    
    header('content-type: image/png');
    imagepng($im);

Expected result:
----------------
The bounding box should be a bounding box

Actual result:
--------------
The string is not contained in the bounding box.


------------------------------------------------------------------------


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