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# Copyright (c) 2021, Manfred Moitzi
# License: MIT License
from typing import List
import math
import pytest
from ezdxf.math import ConstructionPolyline, Vec3
@pytest.fixture(scope="module")
def poly1() -> ConstructionPolyline:
return ConstructionPolyline([(0, 0), (1, 0), (1, 1), (0, 1)])
@pytest.fixture(scope="module")
def poly2() -> ConstructionPolyline:
return ConstructionPolyline([(0, 0), (1, 0), (1, 1), (0, 1)], close=True)
class TestSequenceInterface:
def test_empty_polyline(self):
cp = ConstructionPolyline([])
assert len(cp) == 0
def test_len_open_polyline(self, poly1):
assert len(poly1) == 4
def test_len_closed_polyline(self, poly2):
assert len(poly2) == 5
def test_get_single_vertex(self, poly1):
assert poly1[1] == (1, 0)
def test_get_last_vertex(self, poly1):
assert poly1[-1] == (0, 1)
def test_get_vertex_slice(self, poly1):
assert list(poly1[1:3]) == [(1, 0), (1, 1)]
def test_vertex_slice_has_same_type(self, poly1):
assert isinstance(poly1[1:3], ConstructionPolyline)
def test_is_immutable(self, poly1):
with pytest.raises(TypeError):
poly1[1] = (1, 0)
with pytest.raises(TypeError):
del poly1[1]
class TestExtendedData:
"""The data() method returns the distance from the start vertex along the
polyline, the distance from the previous vertex and the vertex itself for
a give index.
"""
def test_empty_polyline_raises_Value_error(self):
with pytest.raises(ValueError):
ConstructionPolyline([]).data(0)
def test_data_0(self, poly1):
assert poly1.data(0) == (0, 0, (0, 0))
def test_data_1(self, poly1):
assert poly1.data(1) == (1, 1, (1, 0))
def test_data_2(self, poly1):
assert poly1.data(2) == (2, 1, (1, 1))
def test_data_3(self, poly1):
assert poly1.data(3) == (3, 1, (0, 1))
def test_data_for_negative_index(self, poly1):
assert poly1.data(-1) == (3, 1, (0, 1))
assert poly1.data(-2) == (2, 1, (1, 1))
def test_vertices_at_the_same_location(self):
cp = ConstructionPolyline([(0, 0), (0, 0), (0, 0)])
assert cp.data(0) == (0, 0, (0, 0))
assert cp.data(1) == (0, 0, (0, 0))
assert cp.data(2) == (0, 0, (0, 0))
def test_raises_index_error(self, poly1):
with pytest.raises(IndexError):
poly1.data(4)
class TestLength:
def test_empty_polyline(self):
assert ConstructionPolyline([]).length == 0.0
def test_open_polyline(self, poly1):
assert poly1.length == 3.0
def test_closed_polyline(self, poly2):
assert poly2.length == 4.0
def test_vertices_at_the_same_location(self):
cp = ConstructionPolyline([(0, 0), (0, 0), (0, 0)])
assert cp.length == 0.0
class TestIsClosed:
def test_empty_polyline_is_not_closed(self):
assert ConstructionPolyline([]).is_closed is False
def test_polyline_with_too_few_vertices_is_not_closed(self):
assert ConstructionPolyline([(0, 0)]).is_closed is False
assert ConstructionPolyline([(0, 0), (0, 0)]).is_closed is False
def test_poly1_is_not_closed(self, poly1):
assert poly1.is_closed is False
def test_poly2_is_closed(self, poly2):
assert poly2.is_closed is True
class TestIndexAt:
@pytest.mark.parametrize("d", [-1, 0, 1])
def test_empty_polyline(self, d):
assert ConstructionPolyline([]).index_at(d) == 0
@pytest.mark.parametrize("d", [-1, 0, 1])
def test_polyline_with_one_vertex(self, d):
assert ConstructionPolyline([(1, 1)]).index_at(d) == 0
def test_short_polyline(self):
poly = ConstructionPolyline([(0, 0), (1, 0)])
assert poly.index_at(0.0) == 0
assert poly.index_at(0.5) == 1
assert poly.index_at(1) == 1
def test_long_polyline(self):
poly = ConstructionPolyline([(0, 0), (1, 0), (2, 0), (3, 0)])
assert poly.index_at(0.0) == 0
assert poly.index_at(0.999) == 1
assert poly.index_at(1.0) == 1
assert poly.index_at(1.001) == 2
assert poly.index_at(1.999) == 2
assert poly.index_at(2.0) == 2
assert poly.index_at(2.001) == 3
assert poly.index_at(2.999) == 3
assert poly.index_at(3.0) == 3
assert poly.index_at(3.001) == 3
class TestVertexAt:
def test_empty_polyline_raises_error(self):
with pytest.raises(ValueError):
ConstructionPolyline([]).vertex_at(0.0)
def test_too_few_vertices_raises_error(self):
with pytest.raises(ValueError):
ConstructionPolyline([(0, 0)]).vertex_at(0.0)
def test_out_of_range_raises_error(self, poly1):
with pytest.raises(ValueError):
poly1.vertex_at(-1)
with pytest.raises(ValueError):
poly1.vertex_at(poly1.length + 0.01)
def test_interpolation_at_vertex_location(self, poly1):
assert poly1.vertex_at(0.0) == (0, 0)
assert poly1.vertex_at(1.0) == (1, 0)
assert poly1.vertex_at(2.0) == (1, 1)
assert poly1.vertex_at(3.0) == (0, 1)
def test_interpolate_last_vertex_of_closed_polyline(self, poly2):
assert poly2.vertex_at(0.0) == (0, 0)
assert poly2.vertex_at(poly2.length) == (0, 0)
def test_interpolate_at_first_edge(self, poly1):
"""Interpolate edge (0, 0) -> (1, 0)"""
assert poly1.vertex_at(0.1).isclose((0.1, 0))
assert poly1.vertex_at(0.5).isclose((0.5, 0))
assert poly1.vertex_at(0.9).isclose((0.9, 0))
def test_interpolate_at_second_edge(self, poly1):
"""Interpolate edge (1, 0) -> (1, 1)"""
assert poly1.vertex_at(1.1).isclose((1.0, 0.1))
assert poly1.vertex_at(1.5).isclose((1.0, 0.5))
assert poly1.vertex_at(1.9).isclose((1.0, 0.9))
def test_interpolation_for_coincident_vertices_in_front(self):
cp = ConstructionPolyline([(0, 0), (0, 0), (0, 0), (1, 0)])
assert cp.vertex_at(0.0).isclose((0.0, 0.0))
assert cp.vertex_at(0.1).isclose((0.1, 0.0))
assert cp.vertex_at(0.5).isclose((0.5, 0.0))
assert cp.vertex_at(0.9).isclose((0.9, 0.0))
assert cp.vertex_at(1.0).isclose((1.0, 0.0))
def test_interpolation_for_coincident_vertices_after(self):
cp = ConstructionPolyline([(0, 0), (1, 0), (1, 0), (1, 0)])
assert cp.vertex_at(0.0).isclose((0.0, 0.0))
assert cp.vertex_at(0.1).isclose((0.1, 0.0))
assert cp.vertex_at(0.5).isclose((0.5, 0.0))
assert cp.vertex_at(0.9).isclose((0.9, 0.0))
assert cp.vertex_at(1.0).isclose((1.0, 0.0))
def test_interpolation_for_coincident_vertices_between(self):
cp = ConstructionPolyline(
[(0, 0), (0.5, 0), (0.5, 0), (0.5, 0), (1, 0)]
)
assert cp.vertex_at(0.0).isclose((0.0, 0.0))
assert cp.vertex_at(0.1).isclose((0.1, 0.0))
assert cp.vertex_at(0.5).isclose((0.5, 0.0))
assert cp.vertex_at(0.9).isclose((0.9, 0.0))
assert cp.vertex_at(1.0).isclose((1.0, 0.0))
class TestDivide:
@pytest.mark.parametrize("count", [-1, 0, 1])
def test_raises_error_invalid_count(self, count, poly1):
with pytest.raises(ValueError):
list(poly1.divide(count))
def test_divide_by_3(self, poly1):
vertices: List[Vec3] = list(poly1.divide(3))
assert vertices[0].isclose(poly1[0])
assert vertices[1].isclose((1, 0.5))
assert vertices[2].isclose(poly1[-1])
def test_divide_by_length(self, poly1):
vertices: List[Vec3] = list(poly1.divide_by_length(0.7))
assert len(vertices) == 5
assert vertices[-1].isclose(poly1.vertex_at(2.8))
def test_divide_by_length_force_last_vertex(self, poly1):
vertices: List[Vec3] = list(
poly1.divide_by_length(0.7, force_last=True)
)
assert len(vertices) == 6
assert vertices[-1].isclose(poly1[-1])
class TestApproximationAccuracy:
def test_unit_circle(self):
from ezdxf.entities import Circle
# create unit circle
circle: Circle = Circle.new(
dxfattribs={"center": (0, 0), "radius": 1.0}
)
cp = ConstructionPolyline(circle.flattening(0.01))
assert cp.is_closed is True
assert len(cp) > 20
assert abs(cp.length - math.tau) < 0.02
def test_unit_circle_by_path(self):
from ezdxf import path
p = path.unit_circle()
cp = ConstructionPolyline(p.flattening(0.01, segments=16))
assert cp.is_closed is True
assert len(cp) > 60
assert abs(cp.length - math.tau) < 0.002
if __name__ == "__main__":
pytest.main([__file__])
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