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Producing polygon offsets using Clipper lib in python


Producing polygon offsets using Clipper lib in python

By : anna
Date : November 22 2020, 09:00 AM
this one helps. I want to produce offset in closed polygons using Clipper lib (http://www.angusj.com/delphi/clipper.php). , the same in pyclipper would be:
code :
subj = ((348, 257), (364, 148), (362, 148), (326, 241), (295, 219), (258, 88), (440, 129), (370, 196), (372, 275))

pco = pyclipper.PyclipperOffset()
pco.AddPath(subj, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON)
pco.Execute(-7.0)

""" Result (2 polygons, see image below):
[[[365, 260], [356, 254], [363, 202]], [[425, 133], [365, 191], [371, 149], [370, 145], [368, 142], [364, 141], [362, 141], [358, 142], [355, 145], [322, 230], [301, 215], [268, 98]]]
"""


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Does the GPC polygon clipper do triangulation?

Does the GPC polygon clipper do triangulation?


By : Dan Stackow
Date : March 29 2020, 07:55 AM
Any of those help GPC will either produce contour (polygon boundary) output, or will give a result as a series of triangle strips for the solid rendering of polygon interiors. Two functions select between the two kinds of output: gpc_polygon_clip() and gpc_tristrip_clip(). Cheers, --Toby Howard, GPC Licensing Manager.
Calculate polygon intersection area with GPC or Clipper

Calculate polygon intersection area with GPC or Clipper


By : Clay Crawley
Date : March 29 2020, 07:55 AM
this will help It seems you're wrong about Clipper and GPC "they only output boolean results". Both libraries calculate intersection polygon - for example, look at the code snippet with picture on Clipper page.
Is it possible to check if a polygon intersects with itself using Clipper?

Is it possible to check if a polygon intersects with itself using Clipper?


By : Ngwe Pan Tee
Date : March 29 2020, 07:55 AM
like below fixes the issue Can I use Clipper to check if my polygon contour intersects with itself (if it is a complex or a simple polygon)? , No, there's no function for that in the library.
Intersection between line and Polygon using clipper library

Intersection between line and Polygon using clipper library


By : user3280909
Date : March 29 2020, 07:55 AM
hop of those help?
You're using the wrong override of Execute for open path intersections. When the subject is a line then the solution needs to be PolyTree and not Paths.
code :
c.AddPath(line, ptSubject, false); // a line is open
c.AddPath(poly, ptClip, true); // a polygon is closed
PolyTree soln; // the solution is a tree
c.Execute(ctIntersection, soln);
General Polygon Clipper: Triangulate without additional vertices

General Polygon Clipper: Triangulate without additional vertices


By : user3844292
Date : March 29 2020, 07:55 AM
To fix the issue you can do Use a different triangulator. poly2tri looks promising.
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