Interactive Plotting

Interactive plotting in hyperspy is handled through matplotlib and is primarily driven though event handling.

Specifically, for some signal s, when the index value for some BaseDataAxis is changed, then the signal plot is updated to reflect the data at that index. Each signal has a _get_current_data function, which will return the data at the current navigation index.

For lazy signals, the _get_current_data function works slightly differently as the current chunk is cached. As a result, the _get_current_data function first checks if the current chunk is cached and then either computes the chunk where the navigation index resides or just pulls the value from the cached chunk.