Reference 〉 Class

Charts( Helipad model )

A Matplotlib-based visualizer for a variety of visualizations that display data that reflects only a single point in time (as opposed to TimeSeries, which displays data over time).


  • Can display a variety of plot types alongside one another, including bar charts, network and spatial plots, and time series, and can also register custom plot types with subclasses of ChartPlot (see the tutorial for an example). See the specific plot classes for features specific to built-in plot types.
  • Time bar at the bottom allows the user to scrub back over the model history

Initialization Parameters

  • model Helipad, required

    The model object.


Click a method name for more detailed documentation.

  • addKeypress( key, fn )

    Registers a function to be run when a key is pressed in a Matplotlib visualizer. fn will run if key is pressed at any time when the plot window is in focus. To narrow the focus to a particular plot, define catchKeypress() in a subclass of ChartPlot.

  • addPlot( name, label, type, … )

    Adds a plot area to the Chart visualizer. Defaults to a bar chart, but can be set to any subclass of ChartPlot.

  • addPlotType( clss )

    Registers a new plot type for the Charts visualizer. Registered plot types can then be added to the visualization area with Charts.addPlot().

  • 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 model.addEvent() 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, which should call super().launch(title) after creating the Matplotlib figure object.

  • scrub( t )

    Updates the visualizer with the values from model time t. This function is called when the time slider is modified and should not be called from user code.

  • sendEvent( event )

    An event handler for Matplotlib-based visualizations that executes functions registered with MPLVisualization.addKeypress() and routes other events to the appropriate ChartPlot object depending on the current mouse position, which are received by ChartPlot.MPLEvent(). This function should not be called directly by user code.

    sendEvent() currently routes key_press_event (keystrokes), button_press_event (mouse clicks), and pick_event (mouse clicks associated with particular pickable Artists).

  • terminate( )

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

  • update( 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.


  • 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.

    Initial value: 0

  • fig matplotlib.Figure

    The Matplotlib Figure object used for rendering the visualization as a whole.

  • plots dict{str:Plot}

    A dict of registered TimeSeriesPlot objects.

  • activePlots dict{str:Plot}

    A dynamic property consisting of the subset of the plots containing the Plots that are currently active.

  • keys dict{str: list[func]}

    Where functions defined in MPLVisualization.addKeypress() are stored.

    Initial value: {}


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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