Graph classes (e.g. graph.Line_Graph()) should allow for more flexible data updates to data_points

[gabrielDiaz-performlab]

Some major limitations with the pyglui graph.Line_graph() class:

• the data source is a fixed size (in cinit: data_points = 25). It does not appear one can adjust this.

• One can only update data_points using the add() function, or by assigning a source function. Furthermore, one can pass only a single value at a time, which is and prepended it onto the existing data source.

I would like some added functionality:

• the ability to change the size of data_points
• the ability to overwrite the data_points by passing in a numpy array of the same size.

[gabrielDiaz-performlab]

I have been introduced to the timeline class, which seems the more appropriate method for implementation.