How to hide edges during animation?

[HHGG]

For not moving crossing shapes I can use "Hide edge" to hide edges.

But is there a tool to hide edges during animation that
automatically shortens or lengthens lines to hide edges?

For example I have an oval and a moving rectangle.
Hide edges at frame 1:



I moved the rectangle in frame 24 to this position:



But I want that the rectangle lines are be lengthens until the crossing
points of the oval for every frame.

Have I to shorten/lengthen the rectangle line for every frame manually or is
there a tool to do this automatically if I only draw frame 1 and frame 24?

[hayasidist]

I'm sure there are many ways to do this ... and I'm guessing that this is just a simplification of the actual artwork.

however - in this simple case one way it can be done is with layers ...

Group:
>copy by ref of circle - but no stroke
>rectangle - all edges have stroke
>circle (to keep the line widths looking the same the stroke width here needs to be twice that of rectangle).

now you can move either or both however you like

[RyanSurrey]

You could use a patch layer between circle and rectangle.

[sbtamu]

Try this and use bone A to move the sq. make sure the bones are not parented together.