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Add an option for the Visvalingam simplification algorithm (#16)

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* First attempt at porting Paul Mach's Visvalingam implementation

* Make indent

* Mostly working

* Approximate equivalence from Douglas-Peucker to Visvalingam levels

* Don't simplify away tile boundary crossing points

* Add a command-line option and test for Visvalingam simplification

* Update changelog

* Cleanup in response to review feedback

* Include <stdio.h> to fix compiler warnings
This commit is contained in:
Erica Fischer
2022-09-30 12:00:07 -07:00
committed by GitHub
parent 6de00c15ec
commit 4ef430b913
11 changed files with 4282 additions and 4 deletions
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README.md
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@@ -483,6 +483,7 @@ the same layer, enclose them in an `all` expression so they will all be evaluate
* `-pn` or `--no-simplification-of-shared-nodes`: Don't simplify away nodes that appear in more than one feature or are used multiple times within the same feature, so that the intersection node will not be lost from intersecting roads. (This will not be effective if you also use `--coalesce` or `--detect-shared-borders`.)
* `-pt` or `--no-tiny-polygon-reduction`: Don't combine the area of very small polygons into small squares that represent their combined area.
* `--tiny-polygon-size=`_size_: Use the specified _size_ for tiny polygons instead of the default 2. Anything above 6 or so will lead to visible artifacts with the default tile detail.
* `-av` or `--visvalingam`: Use Visvalingam's simplification algorithm rather than Douglas-Peucker's.
### Attempts to improve shared polygon boundaries