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Changed default Mobject.scale behavior to scale about center of mobject. Also added easier functionality for scaling about the mobject's edge. This will very likely break certain functionality in any old projects that expect scale to scale about ORIGIN by default

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This commit is contained in:
Grant Sanderson 2018-01-17 09:01:46 -08:00
parent b837bab25f
commit 0bf1a9e303
1 changed files with 15 additions and 5 deletions
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20
mobject/mobject.py
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@ -138,13 +138,22 @@ class Mobject(object):
mob.points += total_vector
return self
def scale(self, scale_factor, about_point = None):
if about_point is not None:
self.shift(-about_point)
def scale(self, scale_factor, about_point = None, about_edge = ORIGIN):
"""
Default behavior is to scale about the center of the mobject.
The argument about_edge can be a vector, indicating which side of
the mobject to scale about, e.g., mob.scale(about_edge = RIGHT)
scales about mob.get_right().
Otherwise, if about_point is given a value, scaling is done with
respect to that point.
"""
if about_point is None:
about_point = self.get_critical_point(about_edge)
self.shift(-about_point)
for mob in self.family_members_with_points():
mob.points *= scale_factor
if about_point is not None:
self.shift(about_point)
self.shift(about_point)
return self
def rotate_about_origin(self, angle, axis = OUT, axes = []):
@ -234,6 +243,7 @@ class Mobject(object):
return self
def scale_in_place(self, scale_factor):
#Redundant with default behavior of scale now.
self.do_in_place(self.scale, scale_factor)
return self