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Add polygon triangulation algorithms and Tri data structure #775

Merged
merged 57 commits into from
Sep 14, 2021
Merged

Add polygon triangulation algorithms and Tri data structure #775

merged 57 commits into from
Sep 14, 2021

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dr-jts
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@dr-jts dr-jts commented Sep 14, 2021 •
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Adds two kinds of polygon triangulation:

  • via ear-clipping (fast but low-quality)
  • via Constrained Delaunay Triangulation (best quality)

Also adds the Tri class to represent triangulations in an efficient way.

As an illustration the following images show the ear-clipping and Constrained Delaunay triangulations of a large lake:
image

image

dr-jts added 30 commits August 24, 2021 12:46
@dr-jts
Initial commit
c4567c0 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Naming changes
c665806 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactor Triangle methods
fcaa795 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactoring
81d6137 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactoring
716e0f0 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactor, clean up code
36f9fdc 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Renaming, refactoring
fb830fc 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactor
7a7d077 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactoring
efa2b41 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactoring
e478e53 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactor out ConstrainedDelaunayTriangulator
be42f58 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Add PolygonTriangulatorTest
63b8265 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
15f5964 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Add Corner envelope test
0052b9d 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Remove debug code
9650c73 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
e613ed7 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Add index to PolygonEarClipper
fb088a3 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
59822e7 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Various updates
21f8978 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Rename VertexSequencePackedRtree
5f8747d 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Fix imports
08a0943 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Improve ApproximateMedialAxis quality
12d101d 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Improve position of corridor exit points
4e23b83 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Improve construction of wedge exit points
4d61afb 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Improve axis
661da83 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactoring
a10def6 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Cleanup, add flag for skipping collinear vertices
e81e181 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
05a63da 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
62d5b48 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Renaming, Javadoc
5771e34 
Signed-off-by: Martin Davis <[email protected]>
dr-jts added 20 commits August 28, 2021 22:00
@dr-jts
Optimize PolygonHoleJoiner
5a8fbf2 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Switch flip for swap
b26a272 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Debugging code
908e259 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Fix EarClipper to handled repeated points
426d89a 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
c955567 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Clean up VSPRtree
e7cd95e 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Remove medial axis code for now
77436d6 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Remove medial axis test for now
7657b77 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactor corner handling
1c1e2bd 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
renaming
b3e0cbc 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Improve ear-clipping code
8940086 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Refactor packages
d2de4e2 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Improve tri.flip method to ensure adjacency
671c4d7 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Add TriTest
0b313ab 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc for Tri
e39031e 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
4f61778 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Remove unused field
8f34c43 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Fix imports
7a9cf57 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
renaming, Javadoc
1bbd505 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts
Javadoc
f7f901b 
Signed-off-by: Martin Davis <[email protected]>
@dr-jts dr-jts self-assigned this Sep 14, 2021
@dr-jts dr-jts changed the title Add polygon triangulation classes Add polygon triangulation algorithms and Tri data structure Sep 14, 2021
@dr-jts dr-jts merged commit 102f680 into locationtech:master Sep 14, 2021
@dr-jts dr-jts deleted the add-polygon-triangulation branch September 14, 2021 19:40
strk pushed a commit to libgeos/geos that referenced this pull request Sep 23, 2021
@pramsey
Port locationtech/jts#775, a constrained
896af22 
delaunay triangulation algorithm.

Adds PolygonTriangulator::triangulate() for a naive ear-clipped
triangulation, and ConstrainedDelaunayTriangulator::triangulate()
for a more aesthetically pleasing polygon triangulation.

Access for the CAPI is via GEOSConstrainedDelaunayTriangulation()
@jodygarnett jodygarnett added this to the 1.19.0 milestone Jun 21, 2022
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