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Arcs can now have arrows on both sides

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Ben Hambrecht 2018-01-22 16:30:07 -08:00
parent 6e1c84a305
commit c7f92d53cd
1 changed files with 24 additions and 10 deletions
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34
topics/geometry.py
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@ -36,18 +36,32 @@ class Arc(VMobject):
)
self.scale(self.radius, about_point = ORIGIN)
def add_tip(self, tip_length = 0.25, end = 0):
def add_tip(self, tip_length = 0.25, at_start = False, at_end = True):
#TODO, do this a better way
if end == 1:
p1 = p2 = p3 = p4 = None
start_arrow = end_arrow = None
if at_start:
p1, p2 = self.points[-2:]
else:
p2, p1 = self.points[:2]
arrow = Arrow(
p1, 2*p2 - p1,
tip_length = tip_length,
max_tip_length_to_length_ratio = 2.0
)
self.add(arrow.split()[-1])
start_arrow = Arrow(
p1, 2*p2 - p1,
tip_length = tip_length,
max_tip_length_to_length_ratio = 2.0
)
self.add(start_arrow.split()[-1])
if at_end:
p4, p3 = self.points[:2]
end_arrow = Arrow(
p3, 2*p4 - p3,
tip_length = tip_length,
max_tip_length_to_length_ratio = 2.0
)
self.add(end_arrow.split()[-1])
self.highlight(self.get_color())
return self