Edit report at https://bugs.php.net/bug.php?id=34020&edit=1
ID: 34020
Updated by: cmb@php.net
Reported by: yorick at gmx dot ch
Summary: ImagePolygon draws broken lines when using
Antialiasing
-Status: Assigned
+Status: Closed
Type: Bug
Package: GD related
Operating System: *
PHP Version: 5.2.6
Assigned To: pajoye
Block user comment: N
Private report: N
New Comment:
Thank you for your bug report. This issue has already been fixed
in the latest released version of PHP, which you can download at
http://www.php.net/downloads.php
Fixed since at least GD 2.1.0
Previous Comments:
------------------------------------------------------------------------
[2005-12-26 17:27:29] sniper@php.net
Assuming this happens also with PHP 5.
------------------------------------------------------------------------
[2005-08-06 19:36:36] pajoye@php.net
I do not need more examples, as I said, it seems to be a blending problem, pixel are blended 2 times
near the intersections.
------------------------------------------------------------------------
[2005-08-06 19:13:02] yorick at gmx dot ch
If you need more examples let me know.
It's often happening at places where the 'curve' comes
close to 45 degrees and is ascending. I know this might
sound weird but I've seen tons of cases where these 2
facts seem to be present.
------------------------------------------------------------------------
[2005-08-06 19:06:26] pajoye@php.net
Blending does that. I will try to figure out how to fix that.
--Pierre
------------------------------------------------------------------------
[2005-08-06 19:02:36] yorick at gmx dot ch
Description:
------------
ImagePolygon draws broken lines when Antialiasing is
enabled. See example at http://
glassdbase.unibas.ch/test.php
Reproduce code:
---------------
<?php
$image = imagecreatetruecolor(500, 300);
$bg = imagecolorallocate($image, 0, 0, 0);
$col_poly = imagecolorallocate($image, 255, 255, 255);
$poly = array(35, 190, 42, 191, 45, 192, 48, 186, 51, 182, 63, 180, 78, 175, 91, 177, 115, 185,
121, 184,
131, 177,
174, 133,
201, 121,
429, 60,
435, 82,
435, 260,
35, 260
);
imageantialias($image, true);
imagepolygon($image, $poly, count($poly) / 2, $col_poly);
header("Content-type: image/png");
imagepng($image);
?>
Expected result:
----------------
An antialiased polygon (=no interruption) as described
in documentation.
Actual result:
--------------
See output of above example at http://
glassdbase.unibas.ch/test.php
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=34020&edit=1