opensource/manim
1
0
Fork 0
mirror of https://github.com/3b1b/manim.git synced 2025-08-02 19:46:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

A nice small commit capturing one atomic change, as usual

Browse Source
This commit is contained in:
Grant Sanderson
2016-08-25 17:15:48 -07:00
parent 15731dc9a2
commit 25efbbf0b0
9 changed files with 499 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
eola/chapter7.py
View File

@ -780,7 +780,7 @@ class Symbolic2To1DTransform(Scene):
class RecommendChapter3(Scene):
def construct(self):
title = TextMobject("""
Definite watch Chapter 3
Definitely watch Chapter 3
if you haven't already
""")
title.to_edge(UP)
@ -2316,7 +2316,56 @@ class NextVideo(Scene):
self.play(ShowCreation(rect))
self.dither()
class CrossAndDualWords(Scene):
def construct(self):
from eola.chapter5 import get_det_text
v_tex, u_tex, w_tex = [
"\\vec{\\textbf{%s}}"%s
for s in "vuw"
]
vector_word = TextMobject("Vector:")
transform_word = TextMobject("Dual transform:")
cross = TexMobject(
v_tex, "=", u_tex, "\\times", w_tex
)
for tex, color in zip([v_tex, u_tex, w_tex], [V_COLOR, U_COLOR, W_COLOR]):
cross.highlight_by_tex(tex, color)
input_array_tex = matrix_to_tex_string(["x", "y", "z"])
func = TexMobject("L\\left(%s\\right) = "%input_array_tex)
matrix = Matrix(np.array([
["x", "y", "z"],
["u_1", "u_2", "u_3"],
["w_1", "w_2", "w_3"],
]).T)
matrix.highlight_columns(WHITE, U_COLOR, W_COLOR)
det_text = get_det_text(matrix)
det_text.add(matrix)
dot_with_cross = TexMobject(
"%s \\cdot ("%input_array_tex,
u_tex, "\\times", w_tex, ")"
)
dot_with_cross.highlight_by_tex(u_tex, U_COLOR)
dot_with_cross.highlight_by_tex(w_tex, W_COLOR)
transform = Group(func, det_text)
transform.arrange_submobjects()
Group(transform, dot_with_cross).scale(0.7)
vector_word.to_corner(UP+LEFT)
transform_word.next_to(vector_word, DOWN, buff = MED_BUFF, aligned_edge = LEFT)
cross.next_to(vector_word, buff = MED_BUFF)
transform.next_to(transform_word, DOWN, buff = MED_BUFF, aligned_edge = LEFT)
dot_with_cross.next_to(func, RIGHT)
self.add(vector_word)
self.play(Write(cross))
self.dither()
self.play(FadeIn(transform_word))
self.play(Write(transform))
self.dither()
self.play(Transform(det_text, dot_with_cross))
self.dither()