Reference 〉 Class


A skeletal class to be subclassed when creating new visualizations from scratch. New visualizations using Matplotlib should use MPLVisualization instead. The class should only be subclassed; it should not be instantiated itself and cannot be used directly as a visualizer.

Subclasses are required to implement the launch(), update(), and event() methods.


Click a method name for more detailed documentation.

  • event( t, color, **kwargs )

    Called when an event is triggered, in order to be reflected in the visualization. For example, a line is drawn in TimeSeries, and the background flashes in Charts. Any kwargs passed to Events.add() are passed to this function, allowing subclasses to receive custom arguments (for example, linestyle in TimeSeries.event()). This method is mandatory for subclasses to implement.

    This function is called automatically when an event is triggered and should not be called by user code.

  • launch( title )

    Launches the visualization window (if in Tkinter) or cell (if in Jupyter). This method is required to be implemented by subclasses.

  • refresh( data )

    Updates the visualization with new data and refreshes the display. This is mandatory for any subclasses to implement. Subclasses implementing this method should also use it to store any data necessary for future visualizer operations.

    This function should only rarely be called by the user; call model.step() instead to increment the model by one period and update the graph.

  • terminate( )

    Cleanup on model termination. This function is called automatically from model.terminate() and should not be called from user code.

Object Properties

  • isNull bool

    True when the model should run as-if with no visualization, for example if all the plots are unselected. False indicates the window can be launched.

  • lastUpdate int

    Because the model can be set to refresh the visualization only every so many periods, this property records the model time when data was last drawn to the visualization. This property is None until the visualization window is launched.

    Initial value: None


Click a hook name for more detailed documentation.

  • visualRefresh( model, visual )

    Runs when the visualizer updates, every n periods as determined by the refresh parameter.

  • visualLaunch( model, visual )

    Runs when model.launchVisual() is called, after the visualization is launched. Use the modelPostSetup hook to catch before the visualization is launched.

Notes and Examples

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