Subject:
RE: [nanogui] GrFillPoly doesn't work on concave polygon
From:
Simon Wood ####@####.####
Date:
8 Mar 2002 14:56:54 -0000
Message-Id: <44632C76B97BD211AF6B00805FADCAB208790B76@exchange.saltaire.pace.co.uk>
I'll probably regret asking, but....
1). Is anyone looking at this?
2). What style of crossing polygon fill do we need (Odd Parity, Non
Exterior or Winding)?
Simon.
-----Original Message-----
From: Jordan Crouse ####@####.####
Sent: Friday, March 01, 2002 3:39 PM
To: Patrice Mancini
Subject: Re: [nanogui] GrFillPoly doesn't work on concave polygon
This is true.
The previous release had an algorithm that was causing many issues, so
in the interest of stability we pulled it out before 0.89-pre-8. If
anyone is interested these sort of algorithms, then the polygon fill
code definitely needs some tender loving care.
Jordan
On Fri, 2002-03-01 at 08:37, Patrice Mancini wrote:
>
> If I try to fill a concave polygone, nothing is drawn...
>
>
>
> GR_POINT pt1[5] = {{10,20},{150,30},{120,120},{60,60},{15,100}};
> GR_POINT pt2[5] = {{10,20},{150,30},{120,120},{60,160},{15,100}};
>
>
> GrPoly(w1,gc1,5,pt1); // OK
> GrFillPoly(w1,gc1,5,pt1); // Fail to draw
>
> GrPoly(w1,gc1,5,pt2); // OK
> GrFillPoly(w1,gc1,5,pt2); // OK
>
> I have this problem with the last release (0.89-pre-8) seems OK with previous release.
>
> Patrice
