def __init__(self, point, color=YELLOW, **kwargs):
digest_config(self, kwargs)
lines = VGroup()
for angle in np.arange(0, TAU, TAU / self.num_lines):
line = Line(ORIGIN, self.line_length * RIGHT)
line.shift((self.flash_radius - self.line_length) * RIGHT)
line.rotate(angle, about_point=ORIGIN)
lines.add(line)
lines.move_to(point)
lines.set_color(color)
lines.set_stroke(width=3)
line_anims = [
ShowCreationThenDestruction(
line, rate_func=squish_rate_func(smooth, 0, 0.5)
)
for line in lines
]
fade_anims = [
UpdateFromAlphaFunc(
line, lambda m, a: m.set_stroke(
width=self.line_stroke_width * (1 - a)
),
rate_func=squish_rate_func(smooth, 0, 0.75)
)
for line in lines
]
AnimationGroup.__init__(
self, *line_anims + fade_anims, **kwargs
)
def create_lines(self):
lines = VGroup()
for angle in np.arange(0, TAU, TAU / self.num_lines):
line = Line(ORIGIN, self.line_length * RIGHT)
line.shift((self.flash_radius - self.line_length) * RIGHT)
line.rotate(angle, about_point=ORIGIN)
lines.add(line)
lines.set_color(self.color)
lines.set_stroke(width=3)
lines.add_updater(lambda l: l.move_to(self.point))
return lines
def gen_text_backgrounds(self, text):
text_with_visible_chars = text.replace(" ", "").replace('\t', "")
text_list = text_with_visible_chars.split("\n")
text_backgrounds = VGroup()
start_i = 0
for line_no in range(text_list.__len__()):
rect_counts = len(text_list[line_no])
text_backgrounds.add(*self[start_i:rect_counts])
start_i += 2 * rect_counts
text_backgrounds.set_color(self.background_color)
return text_backgrounds
def add_remark(self):
nl_text = TextMobject("数轴")
nl_arrow = Arrow(ORIGIN, UP).match_height(nl_text)
nl_remark = VGroup(nl_arrow, nl_text)
nl_remark.scale(0.8)
nl_remark.set_color(LIGHT_GREY)
nl_remark.arrange_submobjects(RIGHT, buff = 0.1)
nl_remark.next_to(self.axes.coords_to_point(0, 0), DOWN, buff = 0.1)
nl_remark.to_edge(LEFT, buff = 0.15)
frac_remark = TextMobject("圆内分数为圆心横坐标")
frac_remark.scale(0.6)
frac_remark.to_corner(DL, buff = 0.15)
farey_sum_remark = TexMobject(
"\\text{Farey Sum: }", "\\dfrac{a}{b} \\oplus \\dfrac{c}{d}", "=", "\\dfrac{a+c}{b+d}"
)
farey_sum_remark[1].set_color(YELLOW)
farey_sum_remark[-1].set_color(PINK)
farey_sum_remark.to_corner(DR, buff = 0.15)
self.add(nl_remark, frac_remark, farey_sum_remark)
