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Re: [cgal-discuss] 回复: 回复: 回复: difference for 2d polygons return incorrect polygon

From: axnmol <>
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Subject: Re: [cgal-discuss] 回复: 回复: 回复: difference for 2d polygons return incorrect polygon
Date: Mon, 27 Apr 2020 02:58:12 -0500 (CDT)
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Hey Luoyo,
I don't think the points you are expecting here are collinear. Thats why the
resultant polygon includes the point (220.240005 , -121.932671).
<http://cgal-discuss.949826.n4.nabble.com/file/t376209/Capture.png>
The graphing software you are using may be doing some rounding error as i
may not be using exact predicates. You can check if these points are
collinear in CGAL as :
Point_2 x, y, z;
x = Point_2(220.240005, -121.932671);
y = Point_2(-369.040009, -439.420013);
z = Point_2(-49.0955925, -267.043030);
if (CGAL::collinear(x, y, z))std::cout << "yes";

Regards.

--
Sent from: http://cgal-discuss.949826.n4.nabble.com/

[cgal-discuss] difference for 2d polygons return incorrect polygon, Luoyu, 04/26/2020
- Re: [cgal-discuss] difference for 2d polygons return incorrect polygon, Efi Fogel, 04/26/2020
  - [cgal-discuss] 回复: difference for 2d polygons return incorrect polygon, 落域, 04/26/2020
    - Re: [cgal-discuss] 回复: difference for 2d polygons return incorrect polygon, Efi Fogel, 04/26/2020
      - [cgal-discuss] 回复: 回复: difference for 2d polygons return incorrect polygon, 落域, 04/26/2020
        
        Re: [cgal-discuss] 回复: 回复: difference for 2d polygons return incorrect polygon, Luoyu, 04/27/2020
      - [cgal-discuss] 回复: 回复: difference for 2d polygons return incorrect polygon, 落域, 04/27/2020
        
        Re: [cgal-discuss] 回复: 回复: difference for 2d polygons return incorrect polygon, axnmol, 04/27/2020
        
        [cgal-discuss] 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, 落域, 04/27/2020
        
        Re: [cgal-discuss] 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, axnmol, 04/27/2020
        [cgal-discuss] 回复: 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, 落域, 04/27/2020
        Re: [cgal-discuss] 回复: 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, axnmol, 04/27/2020
        [cgal-discuss] 回复: 回复: 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, 落域, 04/27/2020
        Re: [cgal-discuss] 回复: 回复: 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, axnmol, 04/27/2020
        [cgal-discuss] 回复: 回复: 回复: 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, 落域, 04/27/2020
        Re: [cgal-discuss] 回复: 回复: 回复: 回复: 回复: 回复: difference for 2d polygons return incorrect polygon, axnmol, 04/27/2020
- Re: [cgal-discuss] difference for 2d polygons return incorrect polygon, axnmol, 04/27/2020

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Re: [cgal-discuss] 回复: 回复: 回复: difference for 2d polygons return incorrect polygon