def add_T_label(self, x_val, side=RIGHT, label=None, color=WHITE, animated=False, **kwargs):
triangle = RegularPolygon(n=3, start_angle=np.pi / 2)
triangle.set_height(MED_SMALL_BUFF)
triangle.move_to(self.coords_to_point(x_val, 0), UP)
triangle.set_fill(color, 1)
triangle.set_stroke(width=0)
if label == None:
T_label = TexMobject(self.variable_point_label, fill_color=color)
else:
T_label = TexMobject(label, fill_color=color)
T_label.next_to(triangle, DOWN)
v_line = self.get_vertical_line_to_graph(
x_val, self.v_graph,
color=YELLOW
)
if animated:
self.play(
DrawBorderThenFill(triangle),
ShowCreation(v_line),
Write(T_label, run_time=1),
**kwargs
)
if np.all(side == LEFT):
self.left_T_label_group = VGroup(T_label, triangle)
self.left_v_line = v_line
self.add(self.left_T_label_group, self.left_v_line)
elif np.all(side == RIGHT):
self.right_T_label_group = VGroup(T_label, triangle)
self.right_v_line = v_line
self.add(self.right_T_label_group, self.right_v_line)
def generate_symbol(self):
symbol = RegularPolygon(
n=3,
stroke_width=0,
fill_color=self.color,
fill_opacity=1,
)
symbol.set_height(self.inner_radius)
return symbol
def generate_points(self):
self.points = []
inner_tri = RegularPolygon(n=3, start_angle=np.pi / 2)
outer_tri = RegularPolygon(n=3, start_angle=np.pi / 2)
inner_tri.flip()
inner_tri.set_height(self.inner_height, about_point=ORIGIN)
outer_tri.set_height(self.outer_height, about_point=ORIGIN)
self.points = outer_tri.points
self.add_subpath(inner_tri.points)
