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Improve how brace sets its width

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Grant Sanderson 2021-01-30 22:11:48 -08:00
parent e3b74ffd7a
commit 53cfbacab4
1 changed files with 20 additions and 14 deletions
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34
manimlib/mobject/svg/brace.py
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@ -1,46 +1,52 @@
import numpy as np import numpy as np
import math
from manimlib.animation.composition import AnimationGroup from manimlib.animation.composition import AnimationGroup
from manimlib.constants import * from manimlib.constants import *
from manimlib.animation.fading import FadeIn from manimlib.animation.fading import FadeIn
from manimlib.animation.growing import GrowFromCenter from manimlib.animation.growing import GrowFromCenter
from manimlib.mobject.svg.tex_mobject import Tex from manimlib.mobject.svg.tex_mobject import Tex
from manimlib.mobject.svg.tex_mobject import SingleStringTex
from manimlib.mobject.svg.tex_mobject import TexText from manimlib.mobject.svg.tex_mobject import TexText
from manimlib.mobject.types.vectorized_mobject import VMobject from manimlib.mobject.types.vectorized_mobject import VMobject
from manimlib.utils.config_ops import digest_config from manimlib.utils.config_ops import digest_config
from manimlib.utils.space_ops import get_norm from manimlib.utils.space_ops import get_norm
class Brace(Tex): class Brace(SingleStringTex):
CONFIG = { CONFIG = {
"buff": 0.2, "buff": 0.2,
"width_multiplier": 2, "tex_string": r"\underbrace{\qquad}"
"max_num_quads": 15,
"min_num_quads": 0,
"background_stroke_width": 0,
} }
def __init__(self, mobject, direction=DOWN, **kwargs): def __init__(self, mobject, direction=DOWN, **kwargs):
digest_config(self, kwargs, locals()) digest_config(self, kwargs, locals())
angle = -np.arctan2(*direction[:2]) + np.pi angle = -math.atan2(*direction[:2]) + PI
mobject.rotate(-angle, about_point=ORIGIN) mobject.rotate(-angle, about_point=ORIGIN)
left = mobject.get_corner(DOWN + LEFT) left = mobject.get_corner(DOWN + LEFT)
right = mobject.get_corner(DOWN + RIGHT) right = mobject.get_corner(DOWN + RIGHT)
target_width = right[0] - left[0] target_width = right[0] - left[0]
# Adding int(target_width) qquads gives approximately the right width super().__init__(self.tex_string, **kwargs)
num_quads = np.clip(
int(self.width_multiplier * target_width),
self.min_num_quads, self.max_num_quads
)
tex_string = "\\underbrace{%s}" % (num_quads * "\\qquad")
Tex.__init__(self, tex_string, **kwargs)
self.tip_point_index = np.argmin(self.get_all_points()[:, 1]) self.tip_point_index = np.argmin(self.get_all_points()[:, 1])
self.stretch_to_fit_width(target_width) self.set_initial_width(target_width)
self.shift(left - self.get_corner(UP + LEFT) + self.buff * DOWN) self.shift(left - self.get_corner(UP + LEFT) + self.buff * DOWN)
for mob in mobject, self: for mob in mobject, self:
mob.rotate(angle, about_point=ORIGIN) mob.rotate(angle, about_point=ORIGIN)
def set_initial_width(self, width):
width_diff = width - self.get_width()
if width_diff > 0:
for tip, rect, vect in [(self[0], self[1], RIGHT), (self[5], self[4], LEFT)]:
rect.set_width(
width_diff / 2 + rect.get_width(),
about_edge=vect, stretch=True
)
tip.shift(-width_diff / 2 * vect)
else:
self.set_width(width, stretch=True)
return self
def put_at_tip(self, mob, use_next_to=True, **kwargs): def put_at_tip(self, mob, use_next_to=True, **kwargs):
if use_next_to: if use_next_to:
mob.next_to( mob.next_to(