title: Visualization of a discrete-event simulation on a grid / warehouse layout
body: <p>I need to simulate a warehouse with several autonomous vehicles moving on a given layout with simple priority rules. In my understanding, the problem can easily be tackled with discrete-event simulation (DES) and I would use <a href="http://simpy.readthedocs.io/en/latest/" rel="noreferrer">SimPy</a> for this. </p>
  
  <p>The problem I see is that it seems very hard to me to visualize the actual trajectories and interactions of these vehicles. Of course, I can log all positions of all vehicles in all periods but how can I proceed then to create a visualization? </p>
  
  <p>The dumbest way would be to create a million pictures, but there has to be a better way. Is there any library or tool to visualize movements of objects on a grid by moving symbols before a background?</p>
  
  <p>Another option would be to use an agent-based approach with a software like <a href="http://www.anylogic.com" rel="noreferrer">AnyLogic</a>, but this seems more complicated to me and I would like to apply a DES approach, preferably with open-source software.</p>