Hi Paul,
please have a look at the thread on osg-submissions where I explain the
details and concepts of multi-touch to Robert:
Am 03.02.11 02:56, schrieb Paul Martz:
> I'm working on a project that needs to generate multitouch events, and I
> have a question about the current (2.9.10) implementation.
>
> There are three main EventQueue methods for adding three different
> multitouch events:
> touchBegan()
> touchMoved()
> touchEnded()
> And their purpose is quite clear from their names.
>
> However, all three of them take a TouchPhase parameter:
> enum TouchPhase {
> TOUCH_UNKNOWN,
> TOUCH_BEGAN,
> TOUCH_MOVED,
> TOUCH_STATIONERY,
> TOUCH_ENDED
> };
>
> It's not clear to me what it would mean if I were to, for example, call
> touchBegan, and pass in TOUCH_ENDED for the phase. This just doesn't
> make sense to specify a phase that contradicts with the type of event
> I'm adding.
>
> I must be misunderstanding the purpose of this interface. If you could
> provide some usage insight I would appreciate it. Thanks!
Ok, I'll try my best: An osg-event encapsulate all touch-points in one
event, so an osg event handler get all touchpoints via one event. From
the system side (IOS) I'll get one event with all touch-points (that
might differ for other multi-touch-implementations).
Here's a real life example:
one finger touch started -> one osg-event with touchBegan(TOUCH_BEGAN)
one finger is moving -> one osg-event with touchMoved(TOUCH_MOVED)
one finger released -> one osg-event with touchEnded(TOUCH_ENDED)
So to make it complicate and to illustrate the usage better:
one finger touch started -> one osg-event with touchBegan(TOUCH_BEGAN)
one finger is moving -> one osg-event with touchMoved(TOUCH_MOVED)
a second touch is registered, while the other touch-point is still valid:
a new osg-event is created with touchBegan
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