On 10/20/2016 2:02 AM, Paul Rubin wrote:
pozz <pozzu...@gmail.com> writes:
What can I do and what *can't* I do with Tkinter?
I look at the very carefully tuned and sometimes animated UI's in fancy
desktop applications like Gimp and don't see a way to do similar things
in Tkinter.
Since I have not seen Gimp, I don't know what 'similar things' consist of.
However, one does animation (timed changes in some configuration
attribute of a widget or widget item) with chained .after(milliseconds,
function, *args) callbacks.
Tkinter is ok for simple basic GUIs with text labels,
buttons, an event loop that lets you catch mouse clicks, etc. Gimp uses
Gtk (I think) and does all kinds of fancy effects that seem difficult
with tkinter, though now that I think about it, they might be doable
with enough effort.
I have done simple animations (movement, color and size changes) for
either my own learning or to answer StackOverflow questions. Others
have also posted demonstration code. Search '[tkinter] animation', for
example.
Tk and tkinter do not come with animation functions or classes per se.
However, Python does have the turtle module, which animates canvas items.
> python -m turtle # runs a demo and test
> python -m turtledemo # front end for about 20 animation demos.
There may also be modules available in PyPI.
If I were doing many animations, I would write functions or classes such
as (writing this for the first time)
animate_ramp(widget, option, milliseconds, steps, end_value)
animate_flip(widget, option, milliseconds, steps, alt_value)
If these were functions, they would be closures defining an inner
function passed as the .after callback.
The first would linearly interpolate between start_value and end_value.
The second would flip back and forth. Possible enhancements: recognize
option 'xy' to mean x,y position and interpolate both together. Allow
milliseconds to be a list of ints so that time steps do not have to be
uniform. For ramp, allow steps and end_values to both be lists (of
equal length) so one call can interpolate multiple segments of a path.
Allow alt_value to be a list that is cycled through. Steps == None
means run forever.
Terry Jan Reedy
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