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Request #45552 Full circle drawn instead of arc with very small angle
Submitted: 2008-07-18 09:27 UTC Modified: 2021-08-25 11:55 UTC
Votes:4
Avg. Score:4.0 ± 1.0
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:1 (50.0%)
From: kore@php.net Assigned: pajoye (profile)
Status: Wont fix Package: GD related
PHP Version: * OS: Linux 2.6.25-gentoo-r6
Private report: No CVE-ID: None
View Developer Edit
 [2008-07-18 09:27 UTC] kore@php.net 
Description:
------------
Instead of a very small arc slice, a full circle is drawn when calling imagefilledarc with very small angles.

Reproduce code:
---------------
<?php

$image = imagecreatetruecolor( 200, 200 );

$bgColor = imagecolorallocatealpha( $image, 255, 255, 255, 127 );
imagealphablending( $image, true );
imagesavealpha( $image, true );
imagefill( $image, 1, 1, $bgColor );

$drawColor = imagecolorallocate( $image, 0, 0, 200 );
imagefilledarc( $image, 100, 100, 100, 100, 30, 30.1, $drawColor, IMG_ARC_PIE );

imagepng( $image, 'imagefilledarc_test.png' );
?>

Expected result:
----------------
An image with a very small arc slice.

Actual result:
--------------
A full circle, like: http://k023.de/imagefilledarc_test.png

Patches

Pull Requests

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 [2008-08-26 16:26 UTC] michal dot dziemianko at gmail dot com 
Hi,
For me it does not seem to be a bug. In the documentation the following declaration is given:

bool imagefilledarc  ( resource $image  , int $cx  , int $cy  , int $width  , int $height  , int $start  , int $end  , int $color  , int $style  )

Your 30.1 is truncated to 30 (conversion to int), then the function is called with parameters $start=30 and $end =30. 

Please note that start and end values are *angles* at which the arc starts/ends with respect to 0 degrees. As both start and end are 30 then it is full circle (drawing starts at 30degrees and goes clockwise all the way round until 30degrees is hit again). That is behaving as expected I think. 

Cheers,
Michal
 [2008-11-25 19:52 UTC] jani@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php
 [2008-11-25 19:53 UTC] pajoye@php.net 
It is more like a feature request.
 [2015-05-07 18:24 UTC] cmb@php.net
-Type: Bug +Type: Feature/Change Request
 [2017-01-22 23:36 UTC] cmb@php.net
-Status: Assigned +Status: Suspended
 [2017-01-22 23:36 UTC] cmb@php.net 
As this is a general libgd issue, I've forwarded the request to
<https://github.com/libgd/libgd/issues/372>, and suspend this
ticket for the time being.
 [2021-07-13 04:06 UTC] pajoye@php.net 
This may benefit from a coming vector 2D support in GD:

https://github.com/libgd/libgd/wiki/3.0-Roadmap#use-of-advance-vector-raster

I don't think that will be fixed before (won't be accurate).
 [2021-08-25 11:55 UTC] cmb@php.net
-Status: Suspended +Status: Wont fix
 [2021-08-25 11:55 UTC] cmb@php.net 
Good point.  So I'm closing this as WONTFIX.
 
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