Edit report at https://bugs.php.net/bug.php?id=63814&edit=1
ID: 63814
Updated by: ab@php.net
Reported by: webmaster at fxtop dot com
Summary: angles parameters in imagefilledarc are integers,
they should be float
Status: Wont fix
Type: Feature/Change Request
Package: GD related
Operating System: Windows
PHP Version: 5.4.9
Block user comment: N
Private report: N
New Comment:
Of course you can discuss that on https://bitbucket.org/pierrejoye/gd-libgd , but
i don't think it's possible to get around that without using some anti aliasing technics.
Also you might want to take a look at the Cairo binding which provides a vector graphics API.
Previous Comments:
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[2012-12-28 14:12:53] webmaster at fxtop dot com
Hello, thanks for your investigation.
I don't blame that coordinates in pixel are integers, that's normal.
The problem is that angles are integers, which is an undue limitation : angles are rounded to
nearest degree. In astronomy, they deal with seconds of arc, which is 1/3600 of a degree.
If problem is inside an external library, it should be reported to that library.
What is the proper website to report such limitation ?
Regards
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[2012-12-28 10:57:57] ab@php.net
That's right, gd takes only integers for coordinates as they're literally pixels. See here
for arcs
http://lxr.php.net/xref/PHP_5_4/ext/gd/libgd/gd.h#546
If you work with float data, you probably will need to do conversion from/to int.
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[2012-12-20 15:24:21] remi@php.net
the gd extension is mostly a wrapper for gd library.
As gd library doesn't accept float values for this comment, I think this is not possible.
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[2012-12-20 12:32:55] webmaster at fxtop dot com
Description:
------------
see sample result at
http://mon-convertisseur.fr/php/imgangle.php?DEGRE=172.3
angles are truncated to nearest integer, in imagefilledarc function, they shouldn't
you can change parameter if you like
---
From manual page: http://www.php.net/function.imagefilledarc#refsect1-function.imagefilledarc-description
---
Test script:
---------------
header("Content-type: image/jpeg");
if (isset($_GET["DEGRE"])){ $lDegre=$_GET["DEGRE"];}
$lSizeX=916;
$lSizeY=945;
$image = imagecreatetruecolor($lSizeX, $lSizeY);
$colorGreen = imagecolorallocate($image, 0, 255, 0);
// background coming from http://commons.wikimedia.org/wiki/File:Protractor_katomierz.jpg
with some little changes
$fond=imagecreatefromjpeg("Protractor_katomierz_tourne05b.jpg");
//HERE I ROUND DEGRE PARAMETER BECAUSE imagefilledarc only accept integers (I prefer it rounded than
truncated)
$lNumDegre=round($lDegre);
$lResult|=imagefilledarc ($image , 460 , 474 , 2*430 , 2*430 , -$lNumDegre , 0, $colorGreen ,
IMG_ARC_PIE );
$lResult|=imagecopymerge($image, $fond, 0, 0, 0 , 0, $lSizeX,$lSizeY,75);
imagejpeg($image, "temp.jpg");
imagedestroy($image);
echo file_get_contents("temp.jpg");
Expected result:
----------------
imagefilledarc should accept float parameters for "start" and "end" parameters.
As you can see on sample at http://mon-convertisseur.fr/php/imgangle.php?DEGRE=172.3
green backgound allways fall on a degre graduation of the protactor.
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Edit this bug report at https://bugs.php.net/bug.php?id=63814&edit=1