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Default to simpler quadratic approximation of cubic beziers

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This commit is contained in:
Grant Sanderson
2023-01-12 18:29:19 -08:00
parent 9464f83d18
commit 644ea41443
1 changed files with 17 additions and 4 deletions
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21
manimlib/mobject/types/vectorized_mobject.py
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@ -20,6 +20,7 @@ from manimlib.utils.bezier import get_smooth_quadratic_bezier_handle_points
from manimlib.utils.bezier import integer_interpolate
from manimlib.utils.bezier import interpolate
from manimlib.utils.bezier import inverse_interpolate
from manimlib.utils.bezier import find_intersection
from manimlib.utils.bezier import partial_quadratic_bezier_points
from manimlib.utils.bezier import outer_interpolate
from manimlib.utils.color import color_gradient
@ -87,6 +88,7 @@ class VMobject(Mobject):
# Could also be "no_joint", "bevel", "miter"
joint_type: str = "auto",
flat_stroke: bool = False,
allow_cubic_to_quad_approx: bool = True,
# Measured in pixel widths
anti_alias_width: float = 1.0,
**kwargs
@ -101,6 +103,7 @@ class VMobject(Mobject):
self.long_lines = long_lines
self.joint_type = joint_type
self.flat_stroke = flat_stroke
self.allow_cubic_to_quad_approx = allow_cubic_to_quad_approx
self.anti_alias_width = anti_alias_width
self.needs_new_triangulation = True
@ -455,15 +458,25 @@ class VMobject(Mobject):
self,
handle1: Vect3,
handle2: Vect3,
anchor: Vect3
anchor: Vect3,
):
"""
Add cubic bezier curve to the path.
"""
self.throw_error_if_no_points()
quadratic_approx = get_quadratic_approximation_of_cubic(
self.get_last_point(), handle1, handle2, anchor
)
last = self.get_last_point()
# If the two relevant tangents are close in angle to each other,
# then just approximate with a single quadratic bezier curve.
# Otherwise, approximate with two
v1 = handle1 - last
v2 = anchor - handle2
angle = angle_between_vectors(v1, v2)
if self.allow_cubic_to_quad_approx and angle < 45 * DEGREES:
quadratic_approx = [last, find_intersection(last, v1, anchor, -v2), anchor]
else:
quadratic_approx = get_quadratic_approximation_of_cubic(
last, handle1, handle2, anchor
)
if self.consider_points_equal(quadratic_approx[1], self.get_last_point()):
# This is to prevent subpaths from accidentally being marked closed
quadratic_approx[1] = midpoint(*quadratic_approx[1:3])