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experimental changes to old Pascal's triangle code

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This commit is contained in:
Ben Hambrecht 2018-04-03 19:39:24 +02:00
parent 6f43be49bf
commit 9e1216397a
1 changed files with 15 additions and 6 deletions
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21
once_useful_constructs/combinatorics.py
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@ -85,12 +85,18 @@ class CountingScene(Scene):
self.number = num_mob
return self
class PascalsTriangle(VMobject):
class CombinationTexMobject(TexMobject):
def __init(self,n,k,**kwargs):
TexMobject.__init__(str(choose(n,k)),**kwargs)
class GeneralizedPascalsTriangle(VMobject):
CONFIG = {
"nrows" : 7,
"height" : FRAME_HEIGHT - 1,
"width" : 1.5*FRAME_X_RADIUS,
"portion_to_fill" : 0.7
"portion_to_fill" : 0.7,
"submob_class" : CombinationTexMobject,
}
def generate_points(self):
self.cell_height = float(self.height) / self.nrows
@ -98,16 +104,16 @@ class PascalsTriangle(VMobject):
self.bottom_left = (self.cell_width * self.nrows / 2.0)*LEFT + \
(self.cell_height * self.nrows / 2.0)*DOWN
num_to_num_mob = {}
self.coords_to_mobs = {}
self.coords_to_mobs = {}
self.coords = [
(n, k)
for n in range(self.nrows)
for k in range(n+1)
]
for n, k in self.coords:
num = choose(n, k)
num = choose(n, k)
center = self.coords_to_center(n, k)
num_mob = TexMobject(str(num))
num_mob = self.submob_class(n,k) #TexMobject(str(num))
scale_factor = min(
1,
self.portion_to_fill * self.cell_height / num_mob.get_height(),
@ -167,7 +173,10 @@ class PascalsTriangle(VMobject):
self.add(mob)
return self
class PascalsTriangle(GeneralizedPascalsTriangle):
CONFIG = {
"submob_class" : CombinationTexMobject,
}