def test_scene_add_remove():
"""Test Scene.add() and Scene.remove()."""
with tempconfig({"dry_run": True}):
scene = Scene()
container_add(scene, lambda: scene.mobjects)
scene = Scene()
container_remove(scene, lambda: scene.mobjects)
def __init__(self, origin: m.Mobject, scene: m.Scene):
self.entries = m.Group(
m.Tex("Contexte~:", color=m.GRAY).next_to(origin,
m.UP * 2,
aligned_edge=m.LEFT))
scene.play(m.FadeInFrom(self.entries, direction=m.DOWN))
self.scene = scene
def test_add_sound(tmpdir):
# create sound file
sound_loc = Path(tmpdir, "noise.wav")
f = wave.open(str(sound_loc), "w")
f.setparams((2, 2, 44100, 0, "NONE", "not compressed"))
for _ in range(22050): # half a second of sound
packed_value = struct.pack("h", 14242)
f.writeframes(packed_value)
f.writeframes(packed_value)
f.close()
scene = Scene()
scene.add_sound(sound_loc)
def test_add_sound():
# create sound file
f = wave.open("noise.wav", "w")
f.setparams((2, 2, 44100, 0, "NONE", "not compressed"))
for _ in range(22050): # half a second of sound
packed_value = struct.pack("h", 14242)
f.writeframes(packed_value)
f.writeframes(packed_value)
f.close()
scene = Scene()
scene.add_sound("noise.wav")
os.remove("noise.wav")
def test_ABC():
"""Test that the Container class cannot be instantiated."""
with pytest.raises(TypeError):
Container()
# The following should work without raising exceptions
Mobject()
Scene()
def test_scene_time():
with tempconfig({"dry_run": True}):
scene = Scene()
assert scene.renderer.time == 0
scene.wait(2)
assert scene.renderer.time == 2
scene.play(FadeIn(Circle()), run_time=0.5)
assert pytest.approx(scene.renderer.time) == 2.5
scene.renderer._original_skipping_status = True
scene.play(FadeIn(Square()), run_time=5) # this animation gets skipped.
assert pytest.approx(scene.renderer.time) == 7.5
def test_custom_animation_mobject_list():
G = Graph([1, 2, 3], [(1, 2), (2, 3)])
scene = Scene()
scene.add(G)
assert scene.mobjects == [G]
with tempconfig({"dry_run": True, "quality": "low_quality"}):
scene.play(G.animate.add_vertices(4))
assert str(G) == "Graph on 4 vertices and 2 edges"
assert scene.mobjects == [G]
scene.play(G.animate.remove_vertices(2))
assert str(G) == "Graph on 3 vertices and 0 edges"
assert scene.mobjects == [G]
def animate(self, scene: Scene):
for actor in self.actors.values():
actor.stretch(
sum(item.get_height() + 0.5 for item in self.interactions))
if scene.renderer.camera.frame_height < self.get_height() + 1.5:
height_scale = scene.renderer.camera.frame_height / (
self.get_height() + 1.5)
else:
height_scale = 1
if scene.renderer.camera.frame_width < self.get_width() + 5:
width_scale = scene.renderer.camera.frame_width / (
self.get_width() + 5)
else:
width_scale = 1
scale = min(1, height_scale, width_scale)
self.scale(scale)
self.to_edge(UP)
self.to_edge(LEFT)
start_y = self.get_edge_center(UP)[1] - 1.5 * scale
scene.play(ShowCreation(self))
last: Interaction = None
for interaction in [item for item in self.interactions if item.target]:
interaction.scale(scale)
if not last:
interaction.set_y(start_y, direction=UP)
else:
interaction.set_y(last.get_y(DOWN) - 0.5 * scale, direction=UP)
scene.play(ShowCreation(interaction))
last = interaction
def test_background_color(using_opengl_renderer):
S = Scene()
S.renderer.background_color = "#ff0000"
S.renderer.update_frame(S)
assert np.all(S.renderer.get_frame()[0, 0] == np.array([255, 0, 0, 255]))
S.renderer.background_color = "#436f80"
S.renderer.update_frame(S)
assert np.all(S.renderer.get_frame()[0,
0] == np.array([67, 111, 128, 255]))
S.renderer.background_color = "#fff"
S.renderer.update_frame(S)
assert np.all(S.renderer.get_frame()[0,
0] == np.array([255, 255, 255, 255]))
def test_background_color():
S = Scene()
S.camera.background_color = "#ff0000"
S.renderer.update_frame(S)
assert np.all(S.renderer.get_frame()[0, 0] == np.array([255, 0, 0, 255]))
S.camera.background_color = "#436f80"
S.renderer.update_frame(S)
assert np.all(S.renderer.get_frame()[0,
0] == np.array([67, 111, 128, 255]))
S.camera.background_color = "#bbffbb"
S.camera.background_opacity = 0.5
S.renderer.update_frame(S)
assert np.all(S.renderer.get_frame()[0,
0] == np.array([187, 255, 187, 127]))
def test_subcaption():
with tempconfig({"dry_run": True}):
scene = Scene()
scene.add_subcaption("Testing add_subcaption", duration=1, offset=0)
scene.wait()
scene.play(
Wait(),
run_time=2,
subcaption="Testing Scene.play subcaption interface",
subcaption_duration=1.5,
subcaption_offset=0.5,
)
subcaptions = scene.renderer.file_writer.subcaptions
assert len(subcaptions) == 2
assert subcaptions[0].start == datetime.timedelta(seconds=0)
assert subcaptions[0].end == datetime.timedelta(seconds=1)
assert subcaptions[0].content == "Testing add_subcaption"
assert subcaptions[1].start == datetime.timedelta(seconds=1.5)
assert subcaptions[1].end == datetime.timedelta(seconds=3)
assert subcaptions[
1].content == "Testing Scene.play subcaption interface"
def test_background_color():
S = Scene()
S.camera.background_color = "#ff0000"
S.renderer.update_frame(S)
np.testing.assert_array_equal(S.renderer.get_frame()[0, 0],
np.array([255, 0, 0, 255]))
S.camera.background_color = "#436f80"
S.renderer.update_frame(S)
np.testing.assert_array_equal(S.renderer.get_frame()[0, 0],
np.array([67, 111, 128, 255]))
S.camera.background_color = "#fff"
S.renderer.update_frame(S)
np.testing.assert_array_equal(S.renderer.get_frame()[0, 0],
np.array([255, 255, 255, 255]))
S.camera.background_color = "#bbffbb"
S.camera.background_opacity = 0.5
S.renderer.update_frame(S)
np.testing.assert_array_equal(S.renderer.get_frame()[0, 0],
np.array([93, 127, 93, 127]))
def test_scene_add_remove():
with tempconfig({"dry_run": True}):
scene = Scene()
assert len(scene.mobjects) == 0
scene.add(Mobject())
assert len(scene.mobjects) == 1
scene.add(*(Mobject() for _ in range(10)))
assert len(scene.mobjects) == 11
# Check that adding a mobject twice does not actually add it twice
repeated = Mobject()
scene.add(repeated)
assert len(scene.mobjects) == 12
scene.add(repeated)
assert len(scene.mobjects) == 12
# Check that Scene.add() returns the Scene (for chained calls)
assert scene.add(Mobject()) is scene
to_remove = Mobject()
scene = Scene()
scene.add(to_remove)
scene.add(*(Mobject() for _ in range(10)))
assert len(scene.mobjects) == 11
scene.remove(to_remove)
assert len(scene.mobjects) == 10
scene.remove(to_remove)
assert len(scene.mobjects) == 10
# Check that Scene.remove() returns the instance (for chained calls)
assert scene.add(Mobject()) is scene
def test_scene_remove():
"""Test Scene.remove()."""
scene = Scene()
container_remove(scene, lambda: scene.mobjects)
def test_scene_add():
"""Test Scene.add()."""
scene = Scene()
container_add(scene, lambda: scene.mobjects)
def replace_expr(scene: m.Scene, expr: m.Mobject, text: str, **kwargs) -> None:
"""Play an animation that transforms an expression in an other
kwargs are given to a call to the new Mobject's `move_to` method
"""
scene.play(m.Transform(expr, m.Tex(text).move_to(expr, **kwargs)))
