Month: May 2011

Adding preliminary TUIO support for multi-touch systems (parsing OSC packets for 2D cursor descriptions)

In this post we will begin to add TUIO (Tangible User Interface Object) support to our project by implementing a server module to parse OSC (Open Sound Control) packets for 2D cursor descriptions. This will allow us to import blob events from a client application. We will use the TUIOdroid application available for android devices …

A calibration method based on barycentric coordinates for multi-touch systems

In this post we will touch upon the calibration component for multi-touch systems. By the end of this post we will implement a calibration widget that is integrated with our tracker modules, but before we do that we'll discuss the mathematics behind one method for mapping camera space to screen space. Below is a screen …

Implementing a multi-touch event system to deliver blob events to registered widgets (and creating a demo photo application with inertia) part 2 of 2

In the previous post we discussed the event queue and the abstract base class for the widgets. Now we will concentrate on creating some widgets that we can use by extending the base class, and we will look at setting up the queue, registering widgets, and calling the processEvents() method in our programs main loop. …