PROPixx Demo 1 -- Drawing dots at 480 Hz
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This demo is a simple demonstration of the PROPixx's 480 Hz sequencer. We show four random-color dots around the center of the screen, cycling at a rate of 480 Hz. The demo ends when a key is pressed.

Currently, there is no graphics card capable of drawing individual frames at 480 Hz. In order to achieve this refresh rate, the PROPixx uses a built-in "sequencer" that takes a 1920 x 1080, 120 Hz video signal and breaks it into multiple frames which are then displayed in sequence. In 480 Hz mode, we divide the 1920 x 1080 image into four full color 960 x 540 images, or "quadrants" and show these in a sequence starting with the top left quadrant. All quadrants are displayed full-screen.

.. image:: Quad4xStill.*
  :width: 500
  :align: center

To create our stimuli, we draw our targets as if they were full resolution, full screen. The helper script ``convertToQuadrant`` reassigns and rescales the target positon to the correct quadrant. A screen running in 120 Hz mode will show the four quadrants drawn on the same frame:

.. image:: 480HzDemoFullHD.*
  :width: 300
  :align: center

The PROPixx in 480 Hz mode will display the four quadrants in sequence:

.. image:: 480HzDemoGif.*
  :width: 300
  :align: center

.. literalinclude:: ../DatapixxToolbox/DatapixxDemos/PPxDraw480HzDots.m
   :language: matlab
   :emphasize-lines: 44, 45, 74, 82, 90, 98, 112, 113, 118-132
   :linenos: