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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) 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 #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:] p1, p2 = self.points[-2:]
else: start_arrow = Arrow(
p2, p1 = self.points[:2] p1, 2*p2 - p1,
arrow = Arrow( tip_length = tip_length,
p1, 2*p2 - p1, max_tip_length_to_length_ratio = 2.0
tip_length = tip_length, )
max_tip_length_to_length_ratio = 2.0 self.add(start_arrow.split()[-1])
)
self.add(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()) self.highlight(self.get_color())
return self return self