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Added round_corners method to Polygon

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Grant Sanderson 2019-02-07 21:57:40 -08:00
parent da0f4ef918
commit 5b5415cc3e
1 changed files with 32 additions and 28 deletions
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60
manimlib/mobject/geometry.py
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@ -7,8 +7,11 @@ from manimlib.mobject.types.vectorized_mobject import VGroup
from manimlib.mobject.types.vectorized_mobject import VMobject
from manimlib.mobject.types.vectorized_mobject import DashedVMobject
from manimlib.utils.config_ops import digest_config
from manimlib.utils.iterables import adjacent_n_tuples
from manimlib.utils.iterables import adjacent_pairs
from manimlib.utils.simple_functions import fdiv
from manimlib.utils.space_ops import angle_of_vector
from manimlib.utils.space_ops import angle_between_vectors
from manimlib.utils.space_ops import compass_directions
from manimlib.utils.space_ops import line_intersection
from manimlib.utils.space_ops import get_norm
@ -230,7 +233,7 @@ class Arc(TipableVMobject):
class ArcBetweenPoints(Arc):
def __init__(self, start_point, end_point, angle=TAU / 4, **kwargs):
def __init__(self, start, end, angle=TAU / 4, **kwargs):
Arc.__init__(
self,
angle=angle,
@ -238,7 +241,7 @@ class ArcBetweenPoints(Arc):
)
if angle == 0:
self.set_points_as_corners([LEFT, RIGHT])
self.put_start_and_end_on(start_point, end_point)
self.put_start_and_end_on(start, end)
class CurvedArrow(ArcBetweenPoints):
@ -641,6 +644,30 @@ class Polygon(VMobject):
def get_vertices(self):
return self.get_start_anchors()
def round_corners(self, radius=0.5):
vertices = self.get_vertices()
self.clear_points()
arcs = []
for v1, v2, v3 in adjacent_n_tuples(vertices, 3):
vect1 = v2 - v1
vect2 = v3 - v2
unit_vect1 = normalize(vect1)
unit_vect2 = normalize(vect2)
angle = angle_between_vectors(vect1, vect2)
# Distance between vertex and start of the arc
cut_off_length = radius * np.tan(angle / 2)
arcs.append(ArcBetweenPoints(
v2 - unit_vect1 * cut_off_length,
v2 + unit_vect2 * cut_off_length,
angle=angle
))
# To ensure that we loop through starting with last
arcs = [arcs[-1], *arcs[:-1]]
for arc1, arc2 in adjacent_pairs(arcs):
self.append_points(arc1.points)
self.add_line_to(arc2.get_start())
return self
class RegularPolygon(Polygon):
CONFIG = {
@ -724,32 +751,9 @@ class RoundedRectangle(Rectangle):
"close_new_points": True
}
def generate_points(self):
y, x = self.height / 2., self.width / 2.
r = self.corner_radius
arc_ul = ArcBetweenPoints(x * LEFT + (y - r) * UP, (x - r) * LEFT + y * UP, angle = -TAU/4)
arc_ur = ArcBetweenPoints((x - r) * RIGHT + y * UP, x * RIGHT + (y - r) * UP, angle = -TAU/4)
arc_lr = ArcBetweenPoints(x * RIGHT + (y - r) * DOWN, (x - r) * RIGHT + y * DOWN, angle = -TAU/4)
arc_ll = ArcBetweenPoints(x * LEFT + (y - r) * DOWN, (x - r) * LEFT + y * DOWN, angle = TAU/4) # sic! bug in ArcBetweenPoints?
points = arc_ul.points
points = np.append(points,np.array([y * UP]), axis = 0)
points = np.append(points,np.array([y * UP]), axis = 0)
points = np.append(points,arc_ur.points, axis = 0)
points = np.append(points,np.array([x * RIGHT]), axis = 0)
points = np.append(points,np.array([x * RIGHT]), axis = 0)
points = np.append(points,arc_lr.points, axis = 0)
points = np.append(points,np.array([y * DOWN]), axis = 0)
points = np.append(points,np.array([y * DOWN]), axis = 0)
points = np.append(points,arc_ll.points[::-1], axis = 0) # sic! see comment above
points = np.append(points,np.array([x * LEFT]), axis = 0)
points = np.append(points,np.array([x * LEFT]), axis = 0)
points = np.append(points,np.array([x * LEFT + (y - r) * UP]), axis = 0)
points = points[::-1]
self.set_points(points)
def __init__(self, **kwargs):
Rectangle.__init__(self, **kwargs)
self.round_corners(self.corner_radius)
class Grid(VMobject):