From: lbayuk at pobox dot com Operating system: Linux PHP version: 5.2.5 PHP Bug Type: GD related Bug description: Thick styled lines have scrambled patterns
Description: ------------ Styled lines with thickness greater than 1 are not drawn correctly. The style pattern is not visible, and the lines have a 'scrambled' or 'plaid' appearance. Reproduce code: --------------- <?php $img = imagecreate(800,800); $bg = ImageColorAllocate($img, 255, 255, 255); $fg = ImageColorAllocate($img, 0, 0, 0); $style = array(); # Make a pattern of 16 on, 4 off, 8 on, 4 off for ($i = 0; $i < 16; $i++) $style[] = $fg; for ($i = 0; $i < 4; $i++) $style[] = IMG_COLOR_TRANSPARENT; for ($i = 0; $i < 8; $i++) $style[] = $fg; for ($i = 0; $i < 4; $i++) $style[] = IMG_COLOR_TRANSPARENT; ImageSetStyle($img, $style); ImageSetThickness($img, 1); ImagePolygon($img,array(50,250,550,250,550,750),3,IMG_COLOR_STYLED); ImageSetThickness($img, 2); ImagePolygon($img,array(100,200,600,200,600,700),3,IMG_COLOR_STYLED); ImageSetThickness($img, 4); ImagePolygon($img,array(150,150,650,150,650,650),3,IMG_COLOR_STYLED); ImageSetThickness($img, 6); ImagePolygon($img,array(200,100,700,100, 700,600),3,IMG_COLOR_STYLED); ImagePng($img); Expected result: ---------------- The output of the script is a PNG file. The image should contain 4 triangles drawn with a styled line (16 pixels on, 4 off, 8 on, 4 off). >From lower left to upper right, the triangles are drawn with line thickness 1, 2, 4, and 6 respectively. The styled pattern should be visible in all of the triangles. Actual result: -------------- The triangle with thickness 1 is correctly drawn. The other triangles are not correctly drawn with the desired line style, although the diagonal part of the thickness 2 triangle looks correct. The other lines appear to have a 'plaid' pattern. Using a 4x screen magnifier, I can see that the multiple parallel lines which make up the thick lines each have the correct style, but the patterns in these lines are offset relative to each other, so the overall appearance does not reflect the desired style. -- Edit bug report at http://bugs.php.net/?id=43475&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=43475&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=43475&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=43475&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=43475&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=43475&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=43475&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=43475&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=43475&r=needscript Try newer version: http://bugs.php.net/fix.php?id=43475&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=43475&r=support Expected behavior: http://bugs.php.net/fix.php?id=43475&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=43475&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=43475&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=43475&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43475&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=43475&r=dst IIS Stability: http://bugs.php.net/fix.php?id=43475&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=43475&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=43475&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=43475&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=43475&r=mysqlcfg
