[Sugar-devel] [Physics] New features

[Gary C Martin]

Hi Walter,

On 31 Aug 2009, at 19:28, Walter Bender wrote:

> So we were using Physics on a really old, slow machine today and it
> ran rather slowly. This was a great feature. I would recommend a way
> to slow down the clock.

Were you testing Asaf's development rep of Physics (with trails), or  
was is Physic-3 release? I haven't run Asaf's latest experimental work  
on an XO-1 yet.

Thanks for the report!

Regards,
--Gary

> On Mon, Aug 31, 2009 at 2:10 PM, Gary C Martin<gary at garycmartin.com>  
> wrote:
>> Hi Asaf,
>>
>> On 31 Aug 2009, at 17:24, Asaf Paris Mandoki wrote:
>>
>>> I'm not sure if you saw my commit with the trace feature so here's a
>>> ping.
>>
>> Thanks for the ping :-) Yes saw your commit, but haven't had time to
>> try it hands on yet (trying to put my available time into new Sugar
>> toolbar work for 0.86, BTW will need to pick that up for Physics  
>> also,
>> I hope all that olpcgames/pygame wrapper stuff doesn't bite us too
>> hard ;-)
>>
>> It's likely going to be the end of the week before I can spend much
>> time on Physics. We need to carefully think about how to avoid
>> complicating the user interface with too many new tools – I can see
>> the need for a "World" tab, and "Material" tab, so that we don't
>> overload on too many features all at once (i.e a young kid could
>> ignore World and Material tabs, and just get on with building things
>> as they do now).
>>
>>> I was also thinking on another new feature. What about joint's
>>> displaying the tension they're in by changing their color?
>>
>> Ooh, yes I like that one, colour would be good, black --> red? Have
>> you had a look at the old Bridge Activity? It did this for the  
>> "rivet"
>> colour.
>>
>>> We could even break the joints if tension is too high.
>>
>> We could. But perhaps save this for when we have more material
>> controls else where, quick thought is that once we have a "Materials"
>> tab, there would be radio buttons for solid links (the default), and
>> breakable links... (and could we manage a 3rd elastic/stretchy links
>> in the code? That's another nice way to store potential energy in a
>> contraption).
>>
>> Regards,
>> --Gary
>>
>> P.S. I'll likely try and tackle Bills single click bug reports in the
>> main git repo before getting to play with new features, but don't let
>> that stop you! :-)
>>
>> P.P.S. Did you like the attempt at illustrating longitudinal wave
>> prorogation? It's a but more tricky to set-up than the transverse  
>> wave
>> example, as you need to get the spacing right to see a nice
>> longitudinal wave propagate before the energy is too dissipated.
>>
>>        http://wiki.sugarlabs.org/go/File:Physics_longitudinal_waves.png
>>
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>
> -- 
> Walter Bender
> Sugar Labs
> http://www.sugarlabs.org