def vector_coordinate_label(vector_mob,
integer_labels=True,
num_places=2,
n_dim=2,
color=WHITE):
vect = np.array(vector_mob.get_end())
if integer_labels:
vect = np.round(vect).astype(int)
else:
vect = np.around(vect, decimals=num_places)
vect = vect[:n_dim]
vect = vect.reshape((n_dim, 1))
label = Matrix(vect, add_background_rectangles_to_entries=False)
label.scale(VECTOR_LABEL_SCALE_FACTOR)
shift_dir = np.array(vector_mob.get_end())
if shift_dir[0] >= 0: # Pointing right
shift_dir -= label.get_left(
) + DEFAULT_MOBJECT_TO_MOBJECT_BUFFER * LEFT
else: # Pointing left
shift_dir -= label.get_right(
) + DEFAULT_MOBJECT_TO_MOBJECT_BUFFER * RIGHT
label.shift(shift_dir)
label.set_color(color)
label.rect = BackgroundRectangle(label)
label.add_to_back(label.rect)
return label
def construct(self):
square = Square(side_length=5, fill_color=YELLOW, fill_opacity=1)
label = TextMobject("Text at an angle")
label_bg = BackgroundRectangle(label, fill_opacity=1)
label_group = VGroup(label_bg, label)
label_group.rotate(TAU / 8)
label2 = TextMobject("Boxed text", color=BLACK)
label2_bg = SurroundingRectangle(label2,
color=BLUE,
fill_color=RED,
fill_opacity=.5)
label2_group = VGroup(label2, label2_bg)
label2_group.next_to(label_group, DOWN)
label3 = TextMobject("Rainbow")
label3.scale(2)
label3.set_color_by_gradient(RED, GREEN, BLUE)
label3.to_edge(DOWN)
self.add(square)
self.play(FadeIn(label_group))
self.play(FadeIn(label2_group))
self.play(FadeIn(label3))
self.wait(2)
def add_background_rectangle(self, color=BLACK, opacity=0.75, **kwargs):
from manimlib.mobject.shape_matchers import BackgroundRectangle
self.background_rectangle = BackgroundRectangle(self,
color=color,
fill_opacity=opacity,
**kwargs)
self.add_to_back(self.background_rectangle)
return self
def add_background_rectangle(self, color=BLACK, opacity=0.75, **kwargs):
# TODO, this does not behave well when the mobject has points,
# since it gets displayed on top
from manimlib.mobject.shape_matchers import BackgroundRectangle
self.background_rectangle = BackgroundRectangle(self,
color=color,
fill_opacity=opacity,
**kwargs)
self.add_to_back(self.background_rectangle)
return self