#38517 [Opn->Asn]: imagefilledarc() with alpha blending mode

From: Date: Mon, 21 Aug 2006 08:31:38 +0000
Subject: #38517 [Opn->Asn]: imagefilledarc() with alpha blending mode
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-101037@lists.php.net to get a copy of this message 
 ID:               38517
 Updated by:       tony2001@php.net
 Reported By:      wkpark at kldp dot org
-Status:           Open
+Status:           Assigned
 Bug Type:         GD related
 Operating System: Linux
 PHP Version:      5.1.5
-Assigned To:      
+Assigned To:      pajoye


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

[2006-08-20 09:08:46] wkpark at kldp dot org

and this is my first try to fix this problem.

this patch use Bresenham algorithm and some simple trick to make
integer based imagefilledarc()

http://chem.skku.ac.kr/~wkpark/linux/patch/php5.x-gd-bresenham3.patch

http://kldp.org/files/gd_try1.png

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[2006-08-20 08:46:48] wkpark at kldp dot org

Description:
------------
there are already similar imagefilledellipse() bug #22103.

but it is not corrected with the imagefilledarc().

the reason why this results are obtained is same as described in
#22103.





Reproduce code:
---------------
<?php
$im = imagecreatetruecolor(401, 802);
imagesavealpha($im, true);
imagealphablending($im, false);
imagefilledrectangle($im, 0, 0, 400, 801, 0x7fffffff);
imagealphablending($im, true);
imagefilledarc($im, 200, 200, 400, 400, 30, 270, 0xff0000, 0);
imagefilledarc($im, 200, 601, 400, 400, 30, 270, 0x40ff0000, 0);
imagepng($im, 'test.png');

echo
'<img src="test.png" />';
?>

and the result http://kldp.org/files/test_0.png



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