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ef00ae5e66When the angle passed to `Circle.point_at_angle` is not in the interval [0, 2 * pi], an error is thrown. This commit maps all angles into the interval [0, 2 * pi].
297 lines
8.4 KiB
Python
297 lines
8.4 KiB
Python
from math import cos, sin
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import numpy as np
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import pytest
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from manim import Circle, Line, Mobject, RegularPolygon, Square, VDict, VGroup, VMobject
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from manim.constants import PI
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def test_vmobject_point_from_propotion():
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obj = VMobject()
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# One long line, one short line
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obj.set_points_as_corners(
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[
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np.array([0, 0, 0]),
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np.array([4, 0, 0]),
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np.array([4, 2, 0]),
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],
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)
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# Total length of 6, so halfway along the object
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# would be at length 3, which lands in the first, long line.
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assert np.all(obj.point_from_proportion(0.5) == np.array([3, 0, 0]))
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with pytest.raises(ValueError, match="between 0 and 1"):
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obj.point_from_proportion(2)
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obj.clear_points()
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with pytest.raises(Exception, match="with no points"):
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obj.point_from_proportion(0)
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def test_vgroup_init():
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"""Test the VGroup instantiation."""
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VGroup()
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VGroup(VMobject())
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VGroup(VMobject(), VMobject())
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with pytest.raises(TypeError):
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VGroup(Mobject())
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with pytest.raises(TypeError):
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VGroup(Mobject(), Mobject())
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def test_vgroup_add():
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"""Test the VGroup add method."""
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obj = VGroup()
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assert len(obj.submobjects) == 0
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obj.add(VMobject())
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assert len(obj.submobjects) == 1
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with pytest.raises(TypeError):
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obj.add(Mobject())
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assert len(obj.submobjects) == 1
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with pytest.raises(TypeError):
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# If only one of the added object is not an instance of VMobject, none of them should be added
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obj.add(VMobject(), Mobject())
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assert len(obj.submobjects) == 1
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with pytest.raises(ValueError):
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# a Mobject cannot contain itself
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obj.add(obj)
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def test_vgroup_add_dunder():
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"""Test the VGroup __add__ magic method."""
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obj = VGroup()
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assert len(obj.submobjects) == 0
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obj + VMobject()
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assert len(obj.submobjects) == 0
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obj += VMobject()
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assert len(obj.submobjects) == 1
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with pytest.raises(TypeError):
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obj += Mobject()
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assert len(obj.submobjects) == 1
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with pytest.raises(TypeError):
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# If only one of the added object is not an instance of VMobject, none of them should be added
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obj += (VMobject(), Mobject())
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assert len(obj.submobjects) == 1
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with pytest.raises(ValueError):
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# a Mobject cannot contain itself
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obj += obj
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def test_vgroup_remove():
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"""Test the VGroup remove method."""
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a = VMobject()
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c = VMobject()
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b = VGroup(c)
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obj = VGroup(a, b)
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assert len(obj.submobjects) == 2
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assert len(b.submobjects) == 1
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obj.remove(a)
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b.remove(c)
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assert len(obj.submobjects) == 1
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assert len(b.submobjects) == 0
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obj.remove(b)
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assert len(obj.submobjects) == 0
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def test_vgroup_remove_dunder():
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"""Test the VGroup __sub__ magic method."""
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a = VMobject()
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c = VMobject()
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b = VGroup(c)
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obj = VGroup(a, b)
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assert len(obj.submobjects) == 2
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assert len(b.submobjects) == 1
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assert len(obj - a) == 1
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assert len(obj.submobjects) == 2
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obj -= a
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b -= c
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assert len(obj.submobjects) == 1
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assert len(b.submobjects) == 0
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obj -= b
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assert len(obj.submobjects) == 0
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def test_vmob_add_to_back():
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"""Test the Mobject add_to_back method."""
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a = VMobject()
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b = Line()
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c = "text"
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with pytest.raises(ValueError):
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# Mobject cannot contain self
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a.add_to_back(a)
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with pytest.raises(TypeError):
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# All submobjects must be of type Mobject
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a.add_to_back(c)
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# No submobject gets added twice
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a.add_to_back(b)
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a.add_to_back(b, b)
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assert len(a.submobjects) == 1
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a.submobjects.clear()
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a.add_to_back(b, b, b)
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a.add_to_back(b, b)
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assert len(a.submobjects) == 1
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a.submobjects.clear()
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# Make sure the ordering has not changed
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o1, o2, o3 = Square(), Line(), Circle()
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a.add_to_back(o1, o2, o3)
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assert a.submobjects.pop() == o3
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assert a.submobjects.pop() == o2
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assert a.submobjects.pop() == o1
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def test_vdict_init():
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"""Test the VDict instantiation."""
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# Test empty VDict
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VDict()
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# Test VDict made from list of pairs
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VDict([("a", VMobject()), ("b", VMobject()), ("c", VMobject())])
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# Test VDict made from a python dict
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VDict({"a": VMobject(), "b": VMobject(), "c": VMobject()})
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# Test VDict made using zip
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VDict(zip(["a", "b", "c"], [VMobject(), VMobject(), VMobject()]))
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# If the value is of type Mobject, must raise a TypeError
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with pytest.raises(TypeError):
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VDict({"a": Mobject()})
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def test_vdict_add():
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"""Test the VDict add method."""
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obj = VDict()
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assert len(obj.submob_dict) == 0
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obj.add([("a", VMobject())])
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assert len(obj.submob_dict) == 1
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with pytest.raises(TypeError):
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obj.add([("b", Mobject())])
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def test_vdict_remove():
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"""Test the VDict remove method."""
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obj = VDict([("a", VMobject())])
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assert len(obj.submob_dict) == 1
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obj.remove("a")
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assert len(obj.submob_dict) == 0
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with pytest.raises(KeyError):
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obj.remove("a")
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def test_vgroup_supports_item_assigment():
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"""Test VGroup supports array-like assignment for VMObjects"""
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a = VMobject()
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b = VMobject()
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vgroup = VGroup(a)
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assert vgroup[0] == a
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vgroup[0] = b
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assert vgroup[0] == b
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assert len(vgroup) == 1
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def test_vgroup_item_assignment_at_correct_position():
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"""Test VGroup item-assignment adds to correct position for VMObjects"""
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n_items = 10
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vgroup = VGroup()
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for _i in range(n_items):
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vgroup.add(VMobject())
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new_obj = VMobject()
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vgroup[6] = new_obj
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assert vgroup[6] == new_obj
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assert len(vgroup) == n_items
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def test_vgroup_item_assignment_only_allows_vmobjects():
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"""Test VGroup item-assignment raises TypeError when invalid type is passed"""
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vgroup = VGroup(VMobject())
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with pytest.raises(TypeError, match="All submobjects must be of type VMobject"):
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vgroup[0] = "invalid object"
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def test_trim_dummy():
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o = VMobject()
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o.start_new_path(np.array([0, 0, 0]))
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o.add_line_to(np.array([1, 0, 0]))
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o.add_line_to(np.array([2, 0, 0]))
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o.add_line_to(np.array([2, 0, 0])) # Dummy point, will be stripped from points
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o.start_new_path(np.array([0, 1, 0]))
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o.add_line_to(np.array([1, 2, 0]))
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o2 = VMobject()
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o2.start_new_path(np.array([0, 0, 0]))
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o2.add_line_to(np.array([0, 1, 0]))
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o2.start_new_path(np.array([1, 0, 0]))
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o2.add_line_to(np.array([1, 1, 0]))
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o2.add_line_to(np.array([1, 2, 0]))
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def path_length(p):
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return len(p) // o.n_points_per_cubic_curve
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assert tuple(map(path_length, o.get_subpaths())) == (3, 1)
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assert tuple(map(path_length, o2.get_subpaths())) == (1, 2)
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o.align_points(o2)
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assert tuple(map(path_length, o.get_subpaths())) == (2, 2)
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assert tuple(map(path_length, o2.get_subpaths())) == (2, 2)
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def test_bounded_become():
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"""Tests that align_points generates a bounded number of points.
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https://github.com/ManimCommunity/manim/issues/1959
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"""
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o = VMobject()
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def draw_circle(m: VMobject, n_points, x=0, y=0, r=1):
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center = np.array([x, y, 0])
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m.start_new_path(center + [r, 0, 0])
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for i in range(1, n_points + 1):
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theta = 2 * PI * i / n_points
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m.add_line_to(center + [cos(theta) * r, sin(theta) * r, 0])
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# o must contain some points, or else become behaves differently
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draw_circle(o, 2)
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for _ in range(20):
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# Alternate between calls to become with different subpath sizes
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a = VMobject()
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draw_circle(a, 20)
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o.become(a)
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b = VMobject()
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draw_circle(b, 15)
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draw_circle(b, 15, x=3)
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o.become(b)
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# The number of points should be similar to the size of a and b
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assert len(o.points) <= (20 + 15 + 15) * 4
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def test_vmobject_same_points_become():
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a = Square()
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b = Circle()
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a.become(b)
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assert np.array_equal(a.points, b.points)
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assert len(a.submobjects) == len(b.submobjects)
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def test_vmobject_same_num_submobjects_become():
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a = Square()
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b = RegularPolygon(n=6)
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a.become(b)
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assert np.array_equal(a.points, b.points)
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assert len(a.submobjects) == len(b.submobjects)
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def test_vmobject_different_num_points_and_submobjects_become():
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a = Square()
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b = VGroup(Circle(), Square())
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a.become(b)
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assert np.array_equal(a.points, b.points)
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assert len(a.submobjects) == len(b.submobjects)
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def test_vmobject_point_at_angle():
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a = Circle()
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p = a.point_at_angle(4 * PI)
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assert np.array_equal(a.points[0], p)
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