def coords_to_lines(cls, coords, **kwargs):
if not coords:
return []
last_coord = coords[0]
lines = [Line([coords[-1], coords[0]])]
for coord in coords[1:]:
lines.append(Line([last_coord, coord]))
last_coord = coord
return lines
def manufacture(coords, x=0, y=0, rotation=0):
last_coord = coords[0]
lines = [Line([coords[-1], coords[0]])]
for coord in coords[1:]:
lines.append(Line([last_coord, coord]))
last_coord = coord
polygon = Polygon(lines)
polygon.set_position_rotation(x, y, rotation)
polygon.freeze()
return polygon
def find_lines_of_ear(cls, lines, clockwise):
for line1, line2 in cls.iterate_overlapping_pairs(lines):
if not line1.delta_radii_to(line2) > 0 == clockwise:
continue
line3 = Line([(line2.x2, line2.y2), (line1.x1, line1.y1)])
if any(map(lambda line: line1.on_left_side(line.x1, line.y1) == clockwise and
line2.on_left_side(line.x1, line.y1) == clockwise and
line3.on_left_side(line.x1, line.y1) == clockwise,
filterfalse([line1, line2].__contains__, lines))):
continue
return line1, line2, line3
raise AttributeError("No ears found, are you sure this polygon is " +
(clockwise and "clockwise?" or "counter-clockwise?"))
class TestLineRotation(object):
def setup(self):
self.target = Line([(-1, 0), (1, 0)])
def test_line_is_vertical(self):
self.target.rotate(radians(90))
assert round(self.target.x1, 4) == round(self.target.x2, 4)
def test_line_is_same_length(self):
self.target.rotate(radians(90))
assert abs(round(self.target.dy, 4)) == 2
def test_line_radi_is_zero(self):
assert self.target.radii == radians(90)
class TestLineIntersectionMutation(object):
def setup(self):
self.line1 = Line([(-2, 0), (-1, 0)])
self.line2 = Line([(0, -2), (0, -1)])
self.line1.intersection_point(self.line2)
def test_finding_intersection_point_does_not_alter_left_hand_line(self):
assert self.line1.x1 == -2
assert self.line1.x2 == -1
assert self.line1.y1 == 0
assert self.line1.y2 == 0
def test_finding_intersection_point_does_not_alter_right_hand_line(self):
assert self.line2.x1 == 0
assert self.line2.x2 == 0
assert self.line2.y1 == -2
assert self.line2.y2 == -1
class TestLineIntersectionMutationOnHorizontalLine(object):
def setup(self):
self.line1 = Line([(-10, 0), (0, 0)])
self.line2 = Line([(10, 0), (0, 0)])
self.line1.intersection_point(self.line2)
def test_finding_intersection_point_does_not_alter_left_hand_line(self):
assert self.line1.x1 == -10
assert self.line1.x2 == 0
assert self.line1.y1 == 0
assert self.line1.y2 == 0
def test_finding_intersection_point_does_not_alter_right_hand_line(self):
assert self.line2.x1 == 10
assert self.line2.x2 == 0
assert self.line2.y1 == 0
assert self.line2.y2 == 0
def build_polygon(self):
if self._n_parts_alive <= 1:
self._callback("broken")
raise PartConnectionError("Not enough parts")
lines = []
for part, next_part in self._pairwise():
lines.append(Line([(part.position.x, part.position.z), (next_part.position.x, next_part.position.z)]))
polygon = Polygon(lines)
#if self.validate_connection_function(polygon):
return polygon
def setup(self):
line1 = Line([(-2, 0), (-1, 0)])
line2 = Line([(0, -2), (0, -1)])
self.target = line1.intersection_point(line2)
def setup(self):
self.target = Line([(-1, 0), (1, 0)])
def setup(self):
line1 = Line([(1, 1), (-1, -1)])
line2 = Line([(-1, 1), (1, -1)])
self.target = line1.intersection_point(line2)
def setup(self):
line1 = Line([(-2, -3), (1, 0)])
line2 = Line([(2, 3), (5, 0)])
self.target = line1.intersection_point(line2)
self.target2 = line2.intersection_point(line1)
def setup(self):
self.line1 = Line([(-10, 0), (0, 0)])
self.line2 = Line([(10, 0), (0, 0)])
self.line1.intersection_point(self.line2)
def setup(self):
self.target = Line([(0, 0), (10, 10)])
class TestLine(object):
def setup(self):
self.target = Line([(0, 0), (10, 10)])
def test_set_position_rotation(self):
self.target.set_position_rotation(10, 0, 0)
assert self.target.x1 == 10
assert self.target.x2 == 20
assert self.target.y1 == 0
assert self.target.y2 == 10
def test_freeze(self):
self.target.set_position_rotation(10, 0, 0)
self.target.freeze()
assert self.target.x1 == 10
assert self.target.x2 == 20
assert self.target.y1 == 0
assert self.target.y2 == 10
def test_moving_after_freeze(self):
self.target.set_position_rotation(10, 0, 0)
self.target.freeze()
self.target.set_position_rotation(10, 0, 0)
assert self.target.x1 == 20
assert self.target.x2 == 30
assert self.target.y1 == 0
assert self.target.y2 == 10
def __iadd__(self, other):
self._lines += [
Line([(line.x1, line.y1), (line.x2, line.y2)])
for line in other.lines
]
return self
def setup(self):
self.line1 = Line([(-2, 0), (-1, 0)])
self.line2 = Line([(0, -2), (0, -1)])
self.line1.intersection_point(self.line2)
def point_inside(self, x, y):
outside_point = (self.moving_polygon.left - 1, self.moving_polygon.bottom - 1)
break_line = Line([(x, y), outside_point])
n_broken_lines = sum(1 for l in self.moving_polygon.lines if l.intersection_point(break_line)[0])
return n_broken_lines % 2 == 1
