DATAPixx Demo 1 -- Setting up a gaze-contingent display with a DATAPixx
==================================================================================

This demo contains more PTB commands than DATAPixx commands, it creates a gaze-contingent display using an overlay.

In the DATAPixx, the overlay is defined as the right half of the display. We figure out what the gaze-contingent information is (or we simulate it 
in this demo), and we move the overlay bounds with the current gaze (or mouse) position. 

.. Tip::
    This demo will only work on a **DATAPixx**
   
.. literalinclude:: ../DatapixxToolbox/DatapixxDemos/DatapixxGazeContingentDemo.m
   :language: matlab
   :emphasize-lines: 78, 94, 107
   :linenos: