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Request #28761 thick line endings drawn with imageline() are ugly
Submitted: 2004-06-13 06:13 UTC Modified: 2017-01-22 23:00 UTC
From: odarcan at hotmail dot com Assigned:
Status: Suspended Package: GD related
PHP Version: Irrelevant OS: Irrelevant
Private report: No CVE-ID: None
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 [2004-06-13 06:13 UTC] odarcan at hotmail dot com
Description:
------------
i dont think this is a bug, it may be, and i dont know if reporting this here will do any good,

when drawing lines in gd, other than 90degree angles; the endings of the lines always become horisontal

and it looks really, REALLY cheap! it doesnt show when the lines are 1 pixel wide but when drawing thicker lines, it becomes VERY obvious, this is my greatest obstacle in my project right now, ive emailed boutell.com but got no answer.

thanks,
Osman Darcan

Reproduce code:
---------------
<?
$im = imagecreate(400, 400) or die ("Cannot Initialize new GD image stream");
header ("Content-type: image/png");

$grey = imagecolorallocate ($im, 155, 155, 155);
$blue = imagecolorallocate ($im, 0, 0, 255);
$green = imagecolorallocate ($im, 0, 155, 0);

imagesetthickness($im,9);

imageline($im,5,5,50,50,$blue);
imageline($im,50,50,100,300,$blue);
imageline($im,100,300,300,40,$blue);

imageline($im,5+20,5+20,50+20,50+20,$green);
imageline($im,50+20,50+20,60+20,300+20,$green);
imageline($im,100+20,300+20,300+20,40+20,$green);

imagepng($im,"",60);
?>

Expected result:
----------------
try different values for imagesetthickness

Actual result:
--------------
you'll see that some lines look very weird..  im not sure its a bug but it's sure ugly allright..

php and gd deserves something as simple as a decent option to set thickness to lines.. shouldnt be so hard to implement?

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2004-06-13 06:18 UTC] odarcan at hotmail dot com
clarification:
the uglyness appears in the junctions of different lines when the first one's ending coords. is the second one's beginning coords., the drawn lines should be more seamless
 [2015-09-07 17:19 UTC] cmb@php.net
-Summary: lines drawn with imageline() are ugly +Summary: thick line endings drawn with imageline() are ugly -Package: Feature/Change Request +Package: GD related
 [2015-09-07 17:19 UTC] cmb@php.net
I agree that this should be improved. Furthermore being able to
choose the desired line-caps ("butt", "round", "square") would be
nice.
 [2015-09-07 22:05 UTC] yohgaki@php.net
-Operating System: win xp +Operating System: Irrelevant
 [2015-09-07 22:05 UTC] yohgaki@php.net
Modified script to make it work with PHP 5.6/7.0

<?php
$im = imagecreate(400, 400) or die ("Cannot Initialize new GD image stream");
header ("Content-type: image/png");

$grey = imagecolorallocate ($im, 155, 155, 155);
$blue = imagecolorallocate ($im, 0, 0, 255);
$green = imagecolorallocate ($im, 0, 155, 0);

imagesetthickness($im,9);

imageline($im,5,5,50,50,$blue);
imageline($im,50,50,100,300,$blue);
imageline($im,100,300,300,40,$blue);

imageline($im,5+20,5+20,50+20,50+20,$green);
imageline($im,50+20,50+20,60+20,300+20,$green);
imageline($im,100+20,300+20,300+20,40+20,$green);

imagepng($im,NULL,9);
?>
 [2017-01-22 23:00 UTC] cmb@php.net
-Status: Open +Status: Suspended
 [2017-01-22 23:00 UTC] cmb@php.net
Actually, this is a general libgd issue, so I've forwarded to
<https://github.com/libgd/libgd/issues/371>, and suspend this
ticket in the meantime.
 
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