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Randolph and Mortimer

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This commit is contained in:
Grant Sanderson
2015-06-13 19:00:23 -07:00
parent e47f240840
commit 344290068c
18 changed files with 414 additions and 279 deletions
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20
animation/transform.py
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@ -59,19 +59,21 @@ class Transform(Animation):
)
class SemiCircleTransform(Transform):
def __init__(self, mobject1, mobject2, counterclockwise = True,
*args, **kwargs):
Transform.__init__(self, mobject1, mobject2, *args, **kwargs)
self.axis = (0, 0, 1) if counterclockwise else (0, 0, -1)
def update_mobject(self, alpha):
sm, em = self.starting_mobject, self.ending_mobject
midpoints = (sm.points + em.points) / 2
angle = alpha * np.pi
rotation_matrix = np.matrix([
[np.cos(angle), np.sin(angle), 0],
[-np.sin(angle), np.cos(angle), 0],
[0, 0, 1],
])
self.mobject.points = np.dot(
sm.points - midpoints,
np.transpose(rotation_matrix)
) + midpoints
rot_matrix = rotation_matrix(angle, self.axis)[:2, :2]
self.mobject.points[:,:2] = np.dot(
(sm.points - midpoints)[:,:2],
np.transpose(rot_matrix)
) + midpoints[:,:2]
self.mobject.points[:,2] = (1-alpha)*sm.points[:,2] + alpha*em.points[:,2]
self.mobject.rgbs = (1-alpha)*sm.rgbs + alpha*em.rgbs
class FadeToColor(Transform):