Bug #50036 [Asn->Nab]: imagefilledarc ignores angle when start and end are the same

Edit report at https://bugs.php.net/bug.php?id=50036&edit=1 ID: 50036 Updated by: cmb@php.net Reported by: gavin dot miller at areva-td dot com Summary: imagefilledarc ignores angle when start and end are the same -Status: Assigned +Status: Not a bug Type: Bug Package: GD related Operating System: Windows XP PHP Version: 5.2.11 -Assigned To: pajoye +Assigned To: cmb Block user comment: N Private report: N New Comment: This is not a bug, but rather a deliberate design decision. Drawing an arc of 0° does not really make sense, because there's nothing to be drawn, so this case is treated as an arc of 360° has been requested[1]. The strange result is due to the use of IMG_ARC_NOFILL, by the way; if this option is not given, a full black circle is drawn. [1] <https://github.com/php/php-src/blob/php-5.6.10/ext/gd/libgd/gd.c#L1685-L1686> Previous Comments: ------------------------------------------------------------------------ [2009-12-08 12:04:37] felipe@php.net This looks like was introduced by libgd/gd.c:rev.237682 (- Fixed regression introduced by the fix for the libgd bug#74) ------------------------------------------------------------------------ [2009-10-29 16:46:47] gavin dot miller at areva-td dot com Description: ------------ When doing a imagefilledarc where the start and end angle are the same the angle is ignored and zero is used instead. Just upgraded from PHP 5.1.4 to 5.2.11 Using 5.1.4 the function would correctly position a line at the request angle with 5.2.11 zero is always used. the start and end must be at least 1 degree different to produce the correct result. Reproduce code: --------------- --- From manual page: function.imagefilledarc#Description --- <?php $img = imagecreate(200, 200); $white = imagecolorallocate($img, 255, 255, 255); $blue = imagecolorallocate($img, 153, 204, 255); $black = imagecolorallocate($img, 0, 0, 0); imagefilledarc($img, 100, 100, 175, 175,0,360, $blue,IMG_ARC_PIE); imagefilledarc($img, 100, 100, 175, 175, 150,150, $black,IMG_ARC_PIE|IMG_ARC_NOFILL |IMG_ARC_EDGED); header("Content-type: image/png"); imagepng($img); imagedestroy($img); ?> Expected result: ---------------- blue circle with black line drawn at 150degrees Actual result: -------------- blue circle with black line drawn at 0degrees ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=50036&edit=1