#16654: Choose common coordinate system for animations
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Reporter: gagern | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: graphics | Keywords: animate
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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As #16570 demonstrates, choosing a suitable coordinate system for all
frames of an animations can be a non-trivial task. Quite often one will
explicitely specify `xmin`, `xmax`, `ymin` and `ymax` to set a fixed range
for all frames, which may require some trial and error and is therefore
more work that I'd like, particularly given the fact that creating
animations may be a rather time-consuming process.
What I'd like to see instead is an automatic choice of coordinate system
based on the content of all frames. I haven't looked at the implementation
yet, but conceptually I imagine the following: create a dummy Graphics
group containing all the frames suprtimposed over one another. Then do the
auto-layout magic for that whole thing to determine suitable ranges for
the axes. Then pass these to the individual frames.
Since there are situations where one specifically wants the coordinate
system to move, I'd like this automatic adjustment to be configurable. But
catering for the most common application, I'd make it opt-out, not opt-in.
So `animate()` could have some boolean flag, called `common_system` or
`common_ranges` or even `common_coordinate_system`, which defaults to
`True` but could be explicitely set to `False`.
Of course, choosing a default different from what we have so far would
mean breaking backwards compatibility. But since there is no way to
deprecate a given default setting, I see no way to avoid that unless we
want to pass that option as a part of red tape boilerplate to every call
in practical applications, just for the sake of compatibility.
--
Ticket URL: <http://trac.sagemath.org/ticket/16654>
Sage <http://www.sagemath.org>
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