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Edge case for degenerate lines/arrows

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This commit is contained in:
Grant Sanderson
2016-01-07 16:25:01 -08:00
parent 66b0c39fb5
commit d6d47e4e06
1 changed files with 7 additions and 4 deletions
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11
topics/geometry.py
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@ -63,9 +63,11 @@ class Line(Mobject1D):
for arg, unit in zip([start, end], [1, -1])
]
start_to_end = self.end - self.start
start_to_end /= np.linalg.norm(start_to_end)
self.start = self.start + self.buff*start_to_end
self.end = self.end - self.buff*start_to_end
length = np.linalg.norm(start_to_end)
if length > 2*self.buff:
start_to_end /= np.linalg.norm(start_to_end)
self.start = self.start + self.buff*start_to_end
self.end = self.end - self.buff*start_to_end
def generate_points(self):
self.add_line(self.start, self.end)
@ -100,7 +102,8 @@ class Arrow(Line):
def add_tip(self):
num_points = self.get_num_points()
vect = self.start-self.end
vect = vect*self.tip_length/np.linalg.norm(vect)
length = np.linalg.norm(vect)
vect = vect*self.tip_length/length
self.add_points([
interpolate(self.end, self.end+v, t)
for t in np.arange(0, 1, self.tip_length*self.epsilon)