def generate_points(self):
start_angle = np.pi / 2 + self.arc_angle / 2
end_angle = np.pi / 2 - self.arc_angle / 2
self.add(Arc(
start_angle=start_angle,
angle=-self.arc_angle
))
tick_angle_range = np.linspace(start_angle, end_angle, self.num_ticks)
for index, angle in enumerate(tick_angle_range):
vect = rotate_vector(consts.RIGHT, angle)
tick = Line((1 - self.tick_length) * vect, vect)
label = TexMobject(str(10 * index))
label.set_height(self.tick_length)
label.shift((1 + self.tick_length) * vect)
self.add(tick, label)
needle = Polygon(
consts.LEFT, consts.UP, consts.RIGHT,
stroke_width=0,
fill_opacity=1,
fill_color=self.needle_color
)
needle.stretch_to_fit_width(self.needle_width)
needle.stretch_to_fit_height(self.needle_height)
needle.rotate(start_angle - np.pi / 2, about_point=consts.ORIGIN)
self.add(needle)
self.needle = needle
self.center_offset = self.get_center()
def add_axes(self):
x_axis = Line(self.tick_width * consts.LEFT / 2,
self.width * consts.RIGHT)
y_axis = Line(consts.MED_LARGE_BUFF * consts.DOWN,
self.height * consts.UP)
ticks = VGroup()
heights = np.linspace(0, self.height, self.n_ticks + 1)
values = np.linspace(0, self.max_value, self.n_ticks + 1)
for y, value in zip(heights, values):
tick = Line(consts.LEFT, consts.RIGHT)
tick.set_width(self.tick_width)
tick.move_to(y * consts.UP)
ticks.add(tick)
y_axis.add(ticks)
self.add(x_axis, y_axis)
self.x_axis, self.y_axis = x_axis, y_axis
if self.label_y_axis:
labels = VGroup()
for tick, value in zip(ticks, values):
label = TexMobject(str(np.round(value, 2)))
label.set_height(self.y_axis_label_height)
label.next_to(tick, consts.LEFT, consts.SMALL_BUFF)
labels.add(label)
self.y_axis_labels = labels
self.add(labels)