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colored triangle indicator in GraphScene

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Ben Hambrecht 2018-04-12 15:17:25 +02:00
parent c0c202072b
commit 8e7f33c65a
1 changed files with 14 additions and 10 deletions
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24
scene/graph_scene.py
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@ -4,12 +4,13 @@ from constants import *
import itertools as it import itertools as it
from scene.scene import Scene from scene.scene import Scene
from animation.creation import Write from animation.creation import Write, DrawBorderThenFill, ShowCreation
from animation.transform import Transform from animation.transform import Transform
from animation.update import UpdateFromAlphaFunc from animation.update import UpdateFromAlphaFunc
from mobject.functions import ParametricFunction from mobject.functions import ParametricFunction
from mobject.geometry import Line from mobject.geometry import Line
from mobject.geometry import Rectangle from mobject.geometry import Rectangle
from mobject.geometry import RegularPolygon
from mobject.number_line import NumberLine from mobject.number_line import NumberLine
from mobject.svg.tex_mobject import TexMobject from mobject.svg.tex_mobject import TexMobject
from mobject.svg.tex_mobject import TextMobject from mobject.svg.tex_mobject import TextMobject
@ -438,25 +439,28 @@ class GraphScene(Scene):
return group return group
def add_T_label(self, x_val, **kwargs): def add_T_label(self, x_val, color = WHITE, animated = False, **kwargs):
triangle = RegularPolygon(n=3, start_angle = np.pi/2) triangle = RegularPolygon(n=3, start_angle = np.pi/2)
triangle.scale_to_fit_height(MED_SMALL_BUFF) triangle.scale_to_fit_height(MED_SMALL_BUFF)
triangle.move_to(self.coords_to_point(x_val, 0), UP) triangle.move_to(self.coords_to_point(x_val, 0), UP)
triangle.set_fill(WHITE, 1) triangle.set_fill(color, 1)
triangle.set_stroke(width = 0) triangle.set_stroke(width = 0)
T_label = TexMobject(self.variable_point_label) T_label = TexMobject(self.variable_point_label, fill_color = color)
T_label.next_to(triangle, DOWN) T_label.next_to(triangle, DOWN)
v_line = self.get_vertical_line_to_graph( v_line = self.get_vertical_line_to_graph(
x_val, self.v_graph, x_val, self.v_graph,
color = YELLOW color = YELLOW
) )
self.play( if animated:
DrawBorderThenFill(triangle), self.play(
ShowCreation(v_line), DrawBorderThenFill(triangle),
Write(T_label, run_time = 1), ShowCreation(v_line),
**kwargs Write(T_label, run_time = 1),
) **kwargs
)
else:
self.add(triangle, v_line, T_label)
self.T_label_group = VGroup(T_label, triangle) self.T_label_group = VGroup(T_label, triangle)
self.right_v_line = v_line self.right_v_line = v_line