A PathMotion that takes a Path pattern and applies it to the separation between two points.
This base class can be extended to provide motion along a Path to Transitions.
Transitions such as ChangeBounds move Views, typically
in a straight path between the start and end positions. Applications that desire to
have these motions move in a curve can change how Views interpolate in two dimensions
by extending PathMotion and implementing getPath(float, float, float, float).
This may be used in XML as an element inside a transition.
A Path along which the points should be interpolated. The returned Path
must start at point (startX, startY), typically using
moveTo(float, float) and end at (endX, endY).