[Gerbv-devel] [ gerbv-Bugs-2607102 ] Polygon disappears at certain zoom levels

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Bugs item #2607102, was opened at 2009-02-16 16:16
Message generated for change (Comment added) made by tblackmon
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Category: Drawing Engine
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Todd Blackmon (tblackmon)
Assigned to: Nobody/Anonymous (nobody)
Summary: Polygon disappears at certain zoom levels

Initial Comment:
In the included file, there is a polygon in the center when rendered at zoom to fit.  But when zoomed in twice or more, it is no longer rendered.

Sometimes if I put it at the edge of the screen, I can get closer before it disappears.

I also cannot select it when it doesn't render

I'm using the latest build, but it also happens with the Ubuntu release.  I am using all the defaults for the build.

The file was generated from the latest version of Altium Designer.

Todd

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>Comment By: Todd Blackmon (tblackmon)
Date: 2009-02-16 22:24

Message:
Good fix.  It works now.  I was commenting while you were fixing it.

Actually the rs274x spec pdf has an example of closing out a polygon in
this fashion, so it's a valid method.

BTW, that link on the main gerbv page appears to be broken.  I had to find
it elsewhere.

Todd

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Comment By: Todd Blackmon (tblackmon)
Date: 2009-02-16 22:16

Message:
I've found a better definition of the problem now. 

It has to do with a polygon ending with a D02 code.  If the origin is
off-screen, it will not paint that polygon.  I'm not familiar enough with
the code base yet to find it, but I'm including an update of the
test-polygon-fill-1.gbx file to show this error.

The diamond uses a D02 code on it's own line, while the square ends its
last coordinate with D02.  If you pan the origin offscreen, they will both
disappear.

File Added: test-polygon-fill-1.gbx

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Comment By: Julian Lamb (thepurlieu)
Date: 2009-02-16 22:07

Message:
Good catch Todd.  Altrium closes out poylgons in an uncommon fashion, and
apparently I missed some bounding box calcs with it's method.  Fixed in
CVS...let me know if you still see problems with disappearing objects.  The
render optimization code was new in v2.2 and thus probably needs more
testing.

Cheers--
Julian

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