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Modern Event Touch
and Gestures for Pharo
Merwan Ouddane
University Lille 1
RMoD Team
ESUG 2015
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Where are touch devices present ?
Library
Meeting room
Museum
Schools
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What do we need ?
Receive touch events
Recognize a gesture from a sequence of events
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Pharo’s windowing system before
Event are generated by the VM
It’s old…
Incosmplete (Mouse, Keyboard, Complex)
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OSWindow
API created to handle system window + their events
At image side instead of VM side
Cross-platform
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OSWindow
OSWindow
SDL TUIO VM ...
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SDL
 https://www.libsdl.org/
 Development library
 Cross-platform
 Allows a low level access to
hardware
 Large list of events
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Syberia II, game made with SDL

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Existing gestures
Scroll
Rotation
Pinch
Swipe
Hold
Double tap
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Demo time !

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Event path
 Generated event by the driver
 The event is converted into an OSWindow event
 The event is send to the window
 Event handled
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SDL Event
OSWindow
Event
OSWindow
Event
Handler
SDL Events do not creep into Pharo !

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Interactions between handler and gesture detector
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Create and compose gestures
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Where can it used ?
 Interactive table like the TUIO table
 Infra-red table, sending events by web socket
 Phones, tablets, computers with touch screen
 Computers with touchpad
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Where it has been used ?
3D modelisation with Woden
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Where it has been used ?
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How to play ?
Everything will be on CI (as soon as I can) :
https://ci.inria.fr/gestures
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Thanks to Thales for the sponsor
For any information: merwan.ouddane@inria.fr
Videos on Pharo Project’s youtube account ! 17