hypothesis-geometry 6.0.0

hypothesis strategies for geometric objects (points, polygons, etc.).

hypothesis_geometry

In what follows python is an alias for python3.5 or pypy3.5 or any later version (python3.6, pypy3.6 and so on).

Installation

Install the latest pip & setuptools packages versions

python -m pip install --upgrade pip setuptools

User

Download and install the latest stable version from PyPI repository:

python -m pip install --upgrade hypothesis_geometry

Developer

Download the latest version from GitHub repository

git clone https://github.com/lycantropos/hypothesis_geometry.git
cd hypothesis_geometry

Install dependencies

python -m pip install --force-reinstall -r requirements.txt

Install

python setup.py install

Usage

With setup

>>> from ground.base import get_context
>>> from hypothesis import strategies
>>> from hypothesis_geometry import planar
>>> context = get_context()
>>> Contour = context.contour_cls
>>> Empty = context.empty_cls
>>> Mix = context.mix_cls
>>> Multipoint = context.multipoint_cls
>>> Multipolygon = context.multipolygon_cls
>>> Multisegment = context.multisegment_cls
>>> Point = context.point_cls
>>> Polygon = context.polygon_cls
>>> Segment = context.segment_cls
>>> min_coordinate, max_coordinate = -100, 100
>>> coordinates_type = int
>>> coordinates = strategies.integers(min_coordinate, max_coordinate)
>>> import warnings
>>> from hypothesis.errors import NonInteractiveExampleWarning
>>> # ignore hypothesis warnings caused by `example` method call
... warnings.filterwarnings('ignore', category=NonInteractiveExampleWarning)

let's take a look at what can be generated and how.

Empty geometries

>>> empty_geometries = planar.empty_geometries()
>>> empty = empty_geometries.example()
>>> isinstance(empty, Empty)
True

Points

>>> points = planar.points(coordinates)
>>> point = points.example()
>>> isinstance(point, Point)
True
>>> (isinstance(point.x, coordinates_type)
...  and isinstance(point.y, coordinates_type))
True
>>> (min_coordinate <= point.x <= max_coordinate
...  and min_coordinate <= point.y <= max_coordinate)
True

Multipoints

>>> min_size, max_size = 5, 10
>>> multipoints = planar.multipoints(coordinates,
...                                  min_size=min_size,
...                                  max_size=max_size)
>>> multipoint = multipoints.example()
>>> isinstance(multipoint, Multipoint)
True
>>> min_size <= len(multipoint.points) <= max_size
True
>>> all(isinstance(point.x, coordinates_type)
...     and isinstance(point.y, coordinates_type)
...     for point in multipoint.points)
True
>>> all(min_coordinate <= point.x <= max_coordinate
...     and min_coordinate <= point.y <= max_coordinate
...     for point in multipoint.points)
True

Segments

>>> segments = planar.segments(coordinates)
>>> segment = segments.example()
>>> isinstance(segment, Segment)
True
>>> (isinstance(segment.start.x, coordinates_type)
...  and isinstance(segment.start.y, coordinates_type)
...  and isinstance(segment.end.x, coordinates_type)
...  and isinstance(segment.end.y, coordinates_type))
True
>>> (min_coordinate <= segment.start.x <= max_coordinate 
...  and min_coordinate <= segment.start.y <= max_coordinate
...  and min_coordinate <= segment.end.x <= max_coordinate 
...  and min_coordinate <= segment.end.y <= max_coordinate)
True

Multisegments

>>> min_size, max_size = 5, 10
>>> multisegments = planar.multisegments(coordinates, 
...                                      min_size=min_size,
...                                      max_size=max_size)
>>> multisegment = multisegments.example()
>>> isinstance(multisegment, Multisegment)
True
>>> min_size <= len(multisegment.segments) <= max_size
True
>>> all(isinstance(segment.start.x, coordinates_type)
...     and isinstance(segment.start.y, coordinates_type)
...     and isinstance(segment.end.x, coordinates_type)
...     and isinstance(segment.end.y, coordinates_type)
...     for segment in multisegment.segments)
True
>>> all(min_coordinate <= segment.start.x <= max_coordinate
...     and min_coordinate <= segment.start.y <= max_coordinate
...     and min_coordinate <= segment.end.x <= max_coordinate
...     and min_coordinate <= segment.end.y <= max_coordinate
...     for segment in multisegment.segments)
True

Contours

>>> min_size, max_size = 5, 10
>>> contours = planar.contours(coordinates, 
...                            min_size=min_size,
...                            max_size=max_size)
>>> contour = contours.example()
>>> isinstance(contour, Contour)
True
>>> min_size <= len(contour.vertices) <= max_size
True
>>> all(isinstance(vertex.x, coordinates_type)
...     and isinstance(vertex.y, coordinates_type)
...     for vertex in contour.vertices)
True
>>> all(min_coordinate <= vertex.x <= max_coordinate
...     and min_coordinate <= vertex.y <= max_coordinate
...     for vertex in contour.vertices)
True

also planar.concave_contours & planar.convex_contours options are available.

Multicontours

>>> min_size, max_size = 5, 10
>>> min_contour_size, max_contour_size = 4, 8
>>> multicontours = planar.multicontours(coordinates, 
...                                      min_size=min_size,
...                                      max_size=max_size,
...                                      min_contour_size=min_contour_size,
...                                      max_contour_size=max_contour_size)
>>> multicontour = multicontours.example()
>>> isinstance(multicontour, list)
True
>>> all(isinstance(contour, Contour) for contour in multicontour)
True
>>> min_size <= len(multicontour) <= max_size
True
>>> all(min_contour_size <= len(contour.vertices) <= max_contour_size
...     for contour in multicontour)
True
>>> all(isinstance(vertex.x, coordinates_type)
...     and isinstance(vertex.y, coordinates_type)
...     for contour in multicontour
...     for vertex in contour.vertices)
True
>>> all(min_coordinate <= vertex.x <= max_coordinate
...     and min_coordinate <= vertex.y <= max_coordinate
...     for contour in multicontour
...     for vertex in contour.vertices)
True

Polygons

>>> min_size, max_size = 5, 10
>>> min_holes_size, max_holes_size = 1, 3
>>> min_hole_size, max_hole_size = 4, 8
>>> polygons = planar.polygons(coordinates, 
...                            min_size=min_size,
...                            max_size=max_size,
...                            min_holes_size=min_holes_size,
...                            max_holes_size=max_holes_size,
...                            min_hole_size=min_hole_size,
...                            max_hole_size=max_hole_size)
>>> polygon = polygons.example()
>>> isinstance(polygon, Polygon)
True
>>> min_size <= len(polygon.border.vertices) <= max_size
True
>>> min_holes_size <= len(polygon.holes) <= max_holes_size
True
>>> all(min_hole_size <= len(hole.vertices) <= max_hole_size for hole in polygon.holes)
True
>>> polygon_contours = [polygon.border, *polygon.holes]
>>> all(isinstance(vertex.x, coordinates_type)
...     and isinstance(vertex.y, coordinates_type)
...     for contour in polygon_contours
...     for vertex in contour.vertices)
True
>>> all(min_coordinate <= vertex.x <= max_coordinate
...     and min_coordinate <= vertex.y <= max_coordinate
...     for contour in polygon_contours
...     for vertex in contour.vertices)
True

Multipolygons

>>> min_size, max_size = 2, 5
>>> min_border_size, max_border_size = 5, 10
>>> min_holes_size, max_holes_size = 1, 3
>>> min_hole_size, max_hole_size = 4, 8
>>> multipolygons = planar.multipolygons(coordinates, 
...                                      min_size=min_size,
...                                      max_size=max_size,
...                                      min_border_size=min_border_size,
...                                      max_border_size=max_border_size,
...                                      min_holes_size=min_holes_size,
...                                      max_holes_size=max_holes_size,
...                                      min_hole_size=min_hole_size,
...                                      max_hole_size=max_hole_size)
>>> multipolygon = multipolygons.example()
>>> isinstance(multipolygon, Multipolygon)
True
>>> min_size <= len(multipolygon.polygons) <= max_size
True
>>> all(min_border_size <= len(polygon.border.vertices) <= max_border_size
...     and min_holes_size <= len(polygon.holes) <= max_holes_size
...     and all(min_hole_size <= len(hole.vertices) <= max_hole_size
...             for hole in polygon.holes)
...     for polygon in multipolygon.polygons)
True
>>> all(all(isinstance(vertex.x, coordinates_type)
...         and isinstance(vertex.y, coordinates_type)
...         for vertex in polygon.border.vertices)
...     and all(isinstance(vertex.x, coordinates_type)
...             and isinstance(vertex.y, coordinates_type)
...             for hole in polygon.holes
...             for vertex in hole.vertices)
...     for polygon in multipolygon.polygons)
True
>>> all(all(min_coordinate <= vertex.x <= max_coordinate
...         and min_coordinate <= vertex.y <= max_coordinate
...         for vertex in polygon.border.vertices)
...     and all(min_coordinate <= vertex.x <= max_coordinate
...             and min_coordinate <= vertex.y <= max_coordinate
...             for hole in polygon.holes
...             for vertex in hole.vertices)
...     for polygon in multipolygon.polygons)
True

Mixes

>>> min_points_size, max_points_size = 2, 3
>>> min_segments_size, max_segments_size = 1, 4
>>> min_polygons_size, max_polygons_size = 0, 5
>>> min_polygon_border_size, max_polygon_border_size = 5, 10
>>> min_polygon_holes_size, max_polygon_holes_size = 1, 4
>>> min_polygon_hole_size, max_polygon_hole_size = 3, 5
>>> mixes = planar.mixes(coordinates,
...                      min_points_size=min_points_size,
...                      max_points_size=max_points_size,
...                      min_segments_size=min_segments_size,
...                      max_segments_size=max_segments_size,
...                      min_polygons_size=min_polygons_size,
...                      max_polygons_size=max_polygons_size,
...                      min_polygon_border_size=min_polygon_border_size,
...                      max_polygon_border_size=max_polygon_border_size,
...                      min_polygon_holes_size=min_polygon_holes_size,
...                      max_polygon_holes_size=max_polygon_holes_size,
...                      min_polygon_hole_size=min_polygon_hole_size,
...                      max_polygon_hole_size=max_polygon_hole_size)
>>> mix = mixes.example()
>>> isinstance(mix, Mix)
True
>>> isinstance(mix.discrete, (Empty, Multipoint))
True
>>> points = [] if isinstance(mix.discrete, Empty) else mix.discrete.points
>>> min_points_size <= len(points) <= max_points_size
True
>>> all(isinstance(point.x, coordinates_type)
...     and isinstance(point.y, coordinates_type)
...     for point in points)
True
>>> all(min_coordinate <= point.x <= max_coordinate
...     and min_coordinate <= point.y <= max_coordinate
...     for point in points)
True
>>> isinstance(mix.linear, (Empty, Segment, Contour, Multisegment))
True
>>> segments = ([]
...             if isinstance(mix.linear, Empty)
...             else ([mix.linear]
...                   if isinstance(mix.linear, Segment)
...                   else (mix.linear.segments
...                         if isinstance(mix.linear, Multisegment)
...                         else context.contour_edges(mix.linear))))
>>> min_segments_size <= len(segments) <= max_segments_size
True
>>> all(isinstance(segment.start.x, coordinates_type)
...     and isinstance(segment.start.y, coordinates_type)
...     and isinstance(segment.end.x, coordinates_type)
...     and isinstance(segment.end.y, coordinates_type)
...     for segment in segments)
True
>>> all(min_coordinate <= segment.start.x <= max_coordinate
...     and min_coordinate <= segment.start.y <= max_coordinate
...     and min_coordinate <= segment.end.x <= max_coordinate
...     and min_coordinate <= segment.end.y <= max_coordinate
...     for segment in segments)
True
>>> isinstance(mix.shaped, (Empty, Polygon, Multipolygon))
True
>>> polygons = ([]
...             if isinstance(mix.shaped, Empty)
...             else ([mix.shaped]
...                   if isinstance(mix.shaped, Polygon)
...                   else mix.shaped.polygons))
>>> min_polygons_size <= len(polygons) <= max_polygons_size
True
>>> all(min_polygon_border_size
...     <= len(polygon.border.vertices)
...     <= max_polygon_border_size
...     and (min_polygon_holes_size
...          <= len(polygon.holes)
...          <= max_polygon_holes_size)
...     and all(min_polygon_hole_size
...             <= len(hole.vertices)
...             <= max_polygon_hole_size
...             for hole in polygon.holes)
...     for polygon in polygons)
True
>>> all(all(isinstance(vertex.x, coordinates_type)
...         and isinstance(vertex.y, coordinates_type)
...         for vertex in polygon.border.vertices)
...     and all(isinstance(vertex.x, coordinates_type)
...             and isinstance(vertex.y, coordinates_type)
...             for hole in polygon.holes
...             for vertex in hole.vertices)
...     for polygon in polygons)
True
>>> all(all(min_coordinate <= vertex.x <= max_coordinate
...         and min_coordinate <= vertex.y <= max_coordinate
...         for vertex in polygon.border.vertices)
...     and all(min_coordinate <= vertex.x <= max_coordinate
...             and min_coordinate <= vertex.y <= max_coordinate
...             for hole in polygon.holes
...             for vertex in hole.vertices)
...     for polygon in polygons)
True

Caveats

• Strategies may be slow depending on domain, so it may be necessary to add HealthCheck.filter_too_much, HealthCheck.too_slow in suppress_health_check and set deadline to None.

• Unbounded floating point strategies for coordinates (like hypothesis.strategies.floats with unset min_value/max_value) do not play well with bounded sizes and may cause a lot of searching iterations with no success, so it is recommended to use bounded floating point coordinates with bounded sizes or unbounded coordinates with unbounded sizes.

• decimal.Decimal coordinates are not supported, because they seem to be too hard to work with correctly (e.g. sometimes self-intersecting contours arise), so it is suggested to use float or fractions.Fraction instead.

Development

Bumping version

Preparation

Install bump2version.

Pre-release

Choose which version number category to bump following semver specification.

Test bumping version

bump2version --dry-run --verbose $CATEGORY

where $CATEGORY is the target version number category name, possible values are patch/minor/major.

Bump version

bump2version --verbose $CATEGORY

This will set version to major.minor.patch-alpha.

Release

Test bumping version

bump2version --dry-run --verbose release

Bump version

bump2version --verbose release

This will set version to major.minor.patch.

Running tests

Install dependencies

python -m pip install --force-reinstall -r requirements-tests.txt

Plain

pytest

Inside Docker container:

• with CPython

  docker-compose --file docker-compose.cpython.yml up
  

• with PyPy

  docker-compose --file docker-compose.pypy.yml up
  

Bash script (e.g. can be used in Git hooks):

• with CPython

  ./run-tests.sh
  

  or

  ./run-tests.sh cpython
  

• with PyPy

  ./run-tests.sh pypy
  

PowerShell script (e.g. can be used in Git hooks):

• with CPython

  .\run-tests.ps1
  

  or

  .\run-tests.ps1 cpython
  

• with PyPy

  .\run-tests.ps1 pypy