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"""Unit tests for the CollisionPredicates class"""
# Copyright (C) 2014 Anders Logg and August Johansson
#
# This file is part of DOLFIN.
#
# DOLFIN is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# DOLFIN is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
#
# First added: 2014-02-16
# Last changed: 2016-11-22
import pytest
from dolfin import *
from dolfin_utils.test import skip_in_parallel
import numpy as np
@skip_in_parallel
def create_mesh(a, b):
editor = MeshEditor()
mesh = Mesh()
editor.open(mesh, "interval", 1, 2)
editor.init_cells(1)
editor.init_vertices(2)
editor.add_cell(0, np.array( (0, 1), dtype='uint') )
editor.add_vertex(0, np.array( (a.x(), a.y()), dtype='float'))
editor.add_vertex(1, np.array( (b.x(), b.y()), dtype='float'))
editor.close()
return mesh;
@skip_in_parallel
def test_L_version_1():
mesh0 = create_mesh(Point(0., 0.), Point(1., 0.))
mesh1 = create_mesh(Point(0., 0.), Point(0., 1.))
cell0 = Cell(mesh0, 0)
cell1 = Cell(mesh1, 0)
assert cell0.collides(cell1) == True
@skip_in_parallel
def test_L_version_2():
# mesh0 = create_mesh(Point(np.finfo(np.float32).eps, 0.), Point(1., 0.))
# mesh0 = create_mesh(Point(eps(), 0.), Point(1., 0.))
mesh0 = create_mesh(Point(2.23e-15, 0.), Point(1., 0.))
mesh1 = create_mesh(Point(0., 0.), Point(0., 1.))
# print(mesh0.str(True))
# print(mesh1.str(True))
cell0 = Cell(mesh0, 0)
cell1 = Cell(mesh1, 0)
assert cell0.collides(cell1) == False
@skip_in_parallel
def test_L_version_3():
# mesh0 = create_mesh(Point(np.finfo(np.float32).eps, 0.), Point(1., 0.))
# mesh0 = create_mesh(Point(eps(), 0.), Point(1., 0.))
a = Point(2.23e-100, 0.) # assume shewchuk works
b = Point(1., 0.)
c = Point(0., 0.)
d = Point(0., 1.)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(a, b, c, d) == False
@skip_in_parallel
def test_aligned_version_1():
mesh0 = create_mesh(Point(0,0), Point(1,0))
mesh1 = create_mesh(Point(1,0), Point(2,0))
cell0 = Cell(mesh0, 0)
cell1 = Cell(mesh1, 0)
assert cell0.collides(cell1) == True
@skip_in_parallel
def test_aligned_version_2():
mesh0 = create_mesh(Point(0,0), Point(1,0))
mesh1 = create_mesh(Point(2,0), Point(3,0))
cell0 = Cell(mesh0, 0)
cell1 = Cell(mesh1, 0)
assert cell0.collides(cell1) == False
@skip_in_parallel
def test_collinear_1():
p0 = Point(0.05, 0.15)
p1 = Point(0.85, 0.95)
q0 = Point(0.2875, 0.3875)
q1 = Point(0.6125, 0.7125)
meshp = create_mesh(p0, p1)
meshq = create_mesh(q0, q1)
cellp = Cell(meshp, 0)
cellq = Cell(meshq, 0)
assert cellp.collides(cellq) == True
@skip_in_parallel
def test_collinear_2():
res = cpp.geometry.CollisionPredicates.collides_segment_segment_2d(Point(.5, .3),
Point(.5, .4),
Point(.5, .5),
Point(.5, .6))
assert not res
@skip_in_parallel
def test_segment_segment_2d():
# p0 is on segment q0-q1
p0 = Point(1e-30, 0)
p1 = Point(1, 2)
p2 = Point(2, 1)
q0 = Point(1, 0)
q1 = Point(0, 0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p1, q0, q1)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p1, p0, q0, q1)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p1, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p1, p0, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p2, q0, q1)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p2, p0, q0, q1)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p2, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p2, p0, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p1, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p1, p0, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p1, q0, q1)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p1, p0, q0, q1)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p2, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p2, p0, q1, q0)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p0, p2, q0, q1)
assert cpp.geometry.CollisionPredicates.collides_segment_segment_2d(p2, p0, q0, q1)
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