tick artifact when using very large line width

[duidae]

hi:
currently we are using AST for rendering coordinate systems, really a great library, thanks for your effort! However we met a problem which is the tick artifact when using very large line width. I wonder why is there a strange triangle after the rectangular tick? Hope there could be a fix for this, thanks again!

[dsberry]

That looks very much like it may be a problem in the Grf module that AST uses for drawing its primitive graphics (see "Choosing a Graphics Package" http://www.starlink.ac.uk/docs/sun211.htx/sun211se21.html#x22-21100015). Are you using a standard Grf module or have you written your own?

[duidae]

wow thanks for the feedback! I'll check it first, thanks again!

[duidae]

hi @dsberry we found the problem & it's actually caused by our customized grf function, so really appreciate your help! thank you & ast library again!