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Wrap concavehull #218

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b370c5f
Wrap `concavehull`
asinghvi17 Mar 11, 2025
1cb652b
Add concavehull to tests
asinghvi17 Mar 11, 2025
4e288b8
Add context to each test, so we know which functions failed!
asinghvi17 Mar 11, 2025
ddf358c
refactor to have one required arg and then kwarg that changes method …
asinghvi17 Mar 11, 2025
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2 changes: 2 additions & 0 deletions src/geo_interface.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -332,6 +332,8 @@ for f in (
:envelope,
:minimumRotatedRectangle,
:convexhull,
:concavehull,
:concavehull_of_polygons,
:boundary,
:unaryUnion,
:pointOnSurface,
Expand Down
47 changes: 47 additions & 0 deletions src/geos_functions.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -677,6 +677,53 @@ function convexhull(obj::Geometry, context::GEOSContext = get_context(obj))
geomFromGEOS(result, context)
end

"""
concavehull(geom, ratio; bylength = false, allow_holes = true)

Compute the concave hull of a geometry, according to the chi-shape generated from
`geom` with the given `ratio`.

If `bylength` is true, the chi-shape is generated from the length of the geometry,
calling `GEOSConcaveHullByLength`; otherwise it is generated from the area, calling
`GEOSConcaveHull`.

If `allow_holes` is true, the concave hull may have holes. If false, then holes are disallowed.

See also [`convexhull`](@ref), [`concavehull_of_polygons`](@ref).
"""
function concavehull(obj::Geometry; ratio::Union{Real, Nothing} = nothing, length_ratio::Union{Real, Nothing} = nothing, allow_holes::Bool = true, context::GEOSContext = get_context(obj))
result = if isnothing(ratio) && isnothing(length_ratio)
throw(ArgumentError("Either `ratio` or `length_ratio` must be provided to `LibGEOS.concavehull`, none were provided."))
elseif !isnothing(ratio) && !isnothing(length_ratio)
throw(ArgumentError("Only one of `ratio` or `length_ratio` may be provided to `LibGEOS.concavehull`; got both."))
elseif !isnothing(ratio) && isnothing(length_ratio)
GEOSConcaveHull_r(context, obj, ratio, allow_holes)
elseif isnothing(ratio) && !isnothing(length_ratio)
GEOSConcaveHullByLength_r(context, obj, ratio, allow_holes)
end
if result == C_NULL
error("LibGEOS: Error in GEOSConcaveHull")
end
geomFromGEOS(result, context)
end

"""
concavehull_of_polygons(obj::Geometry, ratio; tight = false, allow_holes = true)

Compute the concave hull of a geometry, according to the chi-shape generated from
`obj` with the given `ratio`.

If `tight` is true, the chi-shape is generated from the tightest fit of the geometry,
otherwise it is generated from the area.
"""
function concavehull_of_polygons(obj::Geometry, ratio::Real; tight::Bool = false, allow_holes::Bool = true, context::GEOSContext = get_context(obj))
result = GEOSConcaveHullOfPolygons_r(context, obj, ratio, tight, allow_holes)
if result == C_NULL
error("LibGEOS: Error in GEOSConcaveHullOfPolygons")
end
geomFromGEOS(result, context)
end

function difference(
obj1::Geometry,
obj2::Geometry,
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53 changes: 37 additions & 16 deletions test/test_geo_interface.jl
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Expand Up @@ -318,6 +318,7 @@ const LG = LibGEOS
LG.delaunayTriangulationEdges,
LG.delaunayTriangulation,
LG.constrainedDelaunayTriangulation,
Base.Fix2(LG.concavehull, 0.3),
# these have different signatures
# LG.simplify, LG.topologyPreserveSimplify,
)
Expand Down Expand Up @@ -358,39 +359,51 @@ const LG = LibGEOS
@test geom isa MultiPoint
@test GeoInterface.coordinates(geom) == coords
for f in one_arg_functions
@test f(LibGEOS.MultiPoint(coords)) == f(GeoInterface.MultiPoint(coords))
@testset let current_function = f
@test f(LibGEOS.MultiPoint(coords)) == f(GeoInterface.MultiPoint(coords))
end
end
coords2 = [[0.0, 10], [0.5, 10], [20.0, 20], [10.0, 10], [0.0, 10]]
for f in two_arg_functions
@test f(LibGEOS.LineString(coords), LibGEOS.LineString(coords)) ==
f(GeoInterface.LineString(coords), GeoInterface.LineString(coords))
@testset let current_function = f
@test f(LibGEOS.LineString(coords), LibGEOS.LineString(coords)) ==
f(GeoInterface.LineString(coords), GeoInterface.LineString(coords))
end
end

coords = [[0.0, 0], [0.0, 10], [10.0, 10], [10.0, 0], [0.0, 0]]
geom = GeoInterface.convert(LineString, GeoInterface.LineString(coords))
@test geom isa LineString
@test GeoInterface.coordinates(geom) == coords
for f in one_arg_functions
@test f(LibGEOS.LineString(coords)) == f(GeoInterface.LineString(coords))
@testset let current_function = f
@test f(LibGEOS.LineString(coords)) == f(GeoInterface.LineString(coords))
end
end
coords2 = [[0.0, 10], [0.5, 10], [20.0, 20], [10.0, 10], [0.0, 10]]
for f in two_arg_functions
@test f(LibGEOS.LineString(coords), LibGEOS.LineString(coords)) ==
f(GeoInterface.LineString(coords), GeoInterface.LineString(coords))
@testset let current_function = f
@test f(LibGEOS.LineString(coords), LibGEOS.LineString(coords)) ==
f(GeoInterface.LineString(coords), GeoInterface.LineString(coords))
end
end

coords = [[[0.0, 0], [0.0, 10], [10.0, 10], [10.0, 0], [0.0, 0]]]
geom = GeoInterface.convert(MultiLineString, GeoInterface.MultiLineString(coords))
@test geom isa MultiLineString
@test GeoInterface.coordinates(geom) == coords
for f in one_arg_functions
@test f(LibGEOS.MultiLineString(coords)) ==
f(GeoInterface.MultiLineString(coords))
@testset let current_function = f
@test f(LibGEOS.MultiLineString(coords)) ==
f(GeoInterface.MultiLineString(coords))
end
end
coords2 = [[[0.0, 10], [0.5, 10], [20.0, 20], [10.0, 10], [0.0, 10]]]
for f in two_arg_functions
@test f(LibGEOS.MultiLineString(coords), LibGEOS.MultiLineString(coords2)) ==
f(GeoInterface.MultiLineString(coords), LibGEOS.MultiLineString(coords2))
@testset let current_function = f
@test f(LibGEOS.MultiLineString(coords), LibGEOS.MultiLineString(coords2)) ==
f(GeoInterface.MultiLineString(coords), LibGEOS.MultiLineString(coords2))
end
end

coords = [[[0.0, 0], [0.0, 10], [10.0, 10], [10.0, 0], [0.0, 0]]]
Expand All @@ -401,12 +414,16 @@ const LG = LibGEOS
@test GeoInterface.nhole(geom) == 0
@test GeoInterface.coordinates(geom) == coords
for f in one_arg_functions
@test f(LibGEOS.Polygon(coords)) == f(GeoInterface.Polygon(coords))
@testset let current_function = f
@test f(LibGEOS.Polygon(coords)) == f(GeoInterface.Polygon(coords))
end
end
coords2 = [[[0.0, 10], [0.5, 10], [20.0, 20], [10.0, 10], [0.0, 10]]]
for f in two_arg_functions
@test f(LibGEOS.Polygon(coords), LibGEOS.Polygon(coords2)) ==
f(GeoInterface.Polygon(coords), LibGEOS.Polygon(coords2))
@testset let current_function = f
@test f(LibGEOS.Polygon(coords), LibGEOS.Polygon(coords2)) ==
f(GeoInterface.Polygon(coords), LibGEOS.Polygon(coords2))
end
end

pgeom = LibGEOS.prepareGeom(geom)
Expand All @@ -418,12 +435,16 @@ const LG = LibGEOS
@test geom isa MultiPolygon
@test GeoInterface.coordinates(geom) == coords
for f in one_arg_functions
@test f(LibGEOS.MultiPolygon(coords)) == f(GeoInterface.MultiPolygon(coords))
@testset let current_function = f
@test f(LibGEOS.MultiPolygon(coords)) == f(GeoInterface.MultiPolygon(coords))
end
end
coords2 = [[[[0.0, 10], [0.5, 10], [20.0, 20], [10.0, 10], [0.0, 10]]]]
for f in two_arg_functions
@test f(LibGEOS.MultiPolygon(coords), LibGEOS.MultiPolygon(coords2)) ==
f(GeoInterface.MultiPolygon(coords), LibGEOS.MultiPolygon(coords2))
@testset let current_function = f
@test f(LibGEOS.MultiPolygon(coords), LibGEOS.MultiPolygon(coords2)) ==
f(GeoInterface.MultiPolygon(coords), LibGEOS.MultiPolygon(coords2))
end
end
end

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