Bug #53154 [Opn]: Zero-height rectangle has whiskers

Edit report at https://bugs.php.net/bug.php?id=53154&edit=1 ID: 53154 User updated by: lbayuk at users dot sourceforge dot net Reported by: lbayuk at users dot sourceforge dot net Summary: Zero-height rectangle has whiskers Status: Open Type: Bug Package: GD related Operating System: Linux PHP Version: 5.3.3 Block user comment: N Private report: N New Comment: Verified still there in PHP-5.6.10 Previous Comments: ------------------------------------------------------------------------ [2010-10-25 21:31:01] lbayuk at users dot sourceforge dot net Description: ------------ Using imagerectangle() to draw a rectangle that happens to have zero height results in a horizontal line with small 'whiskers' at the ends. The whiskers extend up and down 1 pixel from the line. This looks weird. This only happens with unit line thickness. It does not happen with zero width rectangles, nor with imagefilledrectangle(). Note: Using PHP-bundled GD library. Test script: --------------- <?php $img = imagecreate(400, 200); $white = imagecolorallocate($img, 255, 255, 255); $black = imagecolorallocate($img, 0, 0, 0); $red = imagecolorallocate($img, 255, 0, 0); imagestring($img, 4, 5, 5, "RECTANGLES", $black); imagestring($img, 4, 150, 5, "Filled", $black); imagestring($img, 4, 300, 5, "Unfilled", $black); imagestring($img, 4, 5, 75, "Height=0", $black); imagestring($img, 4, 5, 145, "Width=0", $black); imagefilledrectangle($img, 150, 95, 200, 95, $black); imagerectangle($img, 300, 95, 350, 95, $black); imagefilledrectangle($img, 175, 125, 175, 175, $black); imagerectangle($img, 325, 125, 325, 175, $black); imageellipse($img, 325, 95, 90, 50, $red); // Circle the bad one imagepng($img); Expected result: ---------------- In all 4 cases, a single line should be drawn. Actual result: -------------- The upper right case (zero height, unfilled rectangle) has whiskers at the ends. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=53154&edit=1