#45552 [Com]: Full circle drawn instead of arc with very small angle

From: Date: Tue, 26 Aug 2008 16:26:15 +0000
Subject: #45552 [Com]: Full circle drawn instead of arc with very small angle
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-128425@lists.php.net to get a copy of this message 
 ID:               45552
 Comment by:       michal dot dziemianko at gmail dot com
 Reported By:      kore@php.net
 Status:           Open
 Bug Type:         GD related
 Operating System: Linux 2.6.25-gentoo-r6
 PHP Version:      5.2.6
 New Comment:

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


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

[2008-07-18 09:27:07] 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


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


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