Interactive data updates

In Example: Tiles plot we have shown how to draw a (non-interactive) Mandelbrot set.

In this example, we show how to realize interactive visualizations with cost consuming calculations using the Mandelbrot set as an example. See also Example: Reacting to changes of axis limits for updating the plot according to the axis limits.

The code is almost the same as in Example: Tiles plot. The differences are

1. the event handler updateLimits() is called if the range of the axis is changed, and
2. a request to (re)draw the graph using requestAnimationFrame() is made only when a previous redraw is finished.

Here a variable dataUpdateScheduled works like an exclusive lock.

The basic structure of the code is as follows: