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fixed and expanded GeneralizedPascalsTriangle

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This commit is contained in:
Ben Hambrecht 2018-04-05 18:49:42 +02:00
parent 23634dbf11
commit 34d4d4316e
1 changed files with 15 additions and 6 deletions
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21
once_useful_constructs/combinatorics.py
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@ -1,7 +1,8 @@
from constants import *
from mobject.svg.tex_mobject import TexMobject
from mobject.types.vectorized_mobject import VMobject
from mobject.types.vectorized_mobject import VMobject, VGroup
from mobject.numbers import Integer
from scene.scene import Scene
from utils.simple_functions import choose
@ -85,9 +86,8 @@ class CountingScene(Scene):
self.number = num_mob
return self
class CombinationTexMobject(TexMobject):
def __init(self,n,k,**kwargs):
TexMobject.__init__(str(choose(n,k)),**kwargs)
def combinationMobject(n,k):
return Integer(choose(n,k))
class GeneralizedPascalsTriangle(VMobject):
@ -96,7 +96,7 @@ class GeneralizedPascalsTriangle(VMobject):
"height" : FRAME_HEIGHT - 1,
"width" : 1.5*FRAME_X_RADIUS,
"portion_to_fill" : 0.7,
"submob_class" : CombinationTexMobject,
"submob_class" : combinationMobject,
}
def generate_points(self):
self.cell_height = float(self.height) / self.nrows
@ -173,9 +173,18 @@ class GeneralizedPascalsTriangle(VMobject):
self.add(mob)
return self
def get_lowest_row(self):
n = self.nrows - 1
lowest_row = VGroup(*[
self.coords_to_mobs[n][k]
for k in range(n+1)
])
return lowest_row
class PascalsTriangle(GeneralizedPascalsTriangle):
CONFIG = {
"submob_class" : CombinationTexMobject,
"submob_class" : combinationMobject,
}