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Simplify initialization of Line with path arc

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This commit is contained in:
Grant Sanderson 2023-09-04 20:49:51 -04:00
parent 5f41e238ba
commit b53ab02675
1 changed files with 19 additions and 29 deletions
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48
manimlib/mobject/geometry.py
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@ -451,6 +451,7 @@ class Line(TipableVMobject):
):
super().__init__(**kwargs)
self.path_arc = path_arc
self.buff = buff
self.set_start_and_end_attrs(start, end)
self.set_points_by_ends(self.start, self.end, buff, path_arc)
@ -461,31 +462,15 @@ class Line(TipableVMobject):
buff: float = 0,
path_arc: float = 0
) -> Self:
vect = end - start
dist = get_norm(vect)
if np.isclose(dist, 0):
self.set_points_as_corners([start, end])
return self
if path_arc:
neg = path_arc < 0
if neg:
path_arc = -path_arc
start, end = end, start
radius = (dist / 2) / math.sin(path_arc / 2)
alpha = (PI - path_arc) / 2
center = start + radius * normalize(rotate_vector(end - start, alpha))
self.clear_points()
self.start_new_path(start)
self.add_arc_to(end, path_arc)
raw_arc_points = quadratic_bezier_points_for_arc(path_arc - 2 * buff / radius)
rot_matrix = rotation_about_z(angle_of_vector(start - center) + buff / radius)
raw_arc_points = raw_arc_points @ rot_matrix.T
if neg:
raw_arc_points = raw_arc_points[::-1]
self.set_points(center + radius * raw_arc_points)
else:
if buff > 0 and dist > 0:
start = start + vect * (buff / dist)
end = end - vect * (buff / dist)
self.set_points_as_corners([start, end])
# Apply buffer
if buff > 0:
length = self.get_arc_length()
alpha = min(buff / length, 0.5)
self.pointwise_become_partial(self, alpha, 1 - alpha)
return self
def set_path_arc(self, new_value: float) -> Self:
@ -666,6 +651,7 @@ class Arrow(Line):
self.tip_len_to_width = tip_len_to_width
self.max_tip_length_to_length_ratio = max_tip_length_to_length_ratio
self.max_width_to_length_ratio = max_width_to_length_ratio
self.n_tip_points = 3
super().__init__(
start, end,
stroke_color=stroke_color,
@ -694,10 +680,13 @@ class Arrow(Line):
alpha = self.max_tip_length_to_length_ratio
else:
alpha = tip_len / arc_len
self.pointwise_become_partial(self, 0, 1 - alpha)
# Dumb that this is needed
self.start_new_path(self.point_from_proportion(1 - 1e-5))
if self.path_arc > 0 and self.buff > 0:
self.insert_n_curves(10) # Is this needed?
self.pointwise_become_partial(self, 0.0, 1.0 - alpha)
self.append_points([self.get_end(), self.get_end()])
self.add_line_to(prev_end)
self.n_tip_points = 3
return self
@Mobject.affects_data
@ -708,8 +697,9 @@ class Arrow(Line):
float(self.get_stroke_width()),
self.max_width_to_length_ratio * self.get_length(),
)
self.data['stroke_width'][:-3] = self.data['stroke_width'][0]
self.data['stroke_width'][-3:, 0] = tip_width * np.linspace(1, 0, 3)
ntp = self.n_tip_points
self.data['stroke_width'][:-ntp] = self.data['stroke_width'][0]
self.data['stroke_width'][-ntp:, 0] = tip_width * np.linspace(1, 0, ntp)
return self
def reset_tip(self) -> Self: