Method chaining

Every method in Plotter.js returns the object it operates on. This is not true if it would not make sense to do so (e.g. getter methods). This feature simplifies API calls on the same object. For example, instead of writing this:

const canvas = diagram.getCanvas()
diagram.setColor('#5599FF') // call every method
diagram.setPointSize(5)     // in a separate
diagram.drawLineChart()     // statement

one could also write this:

const canvas = diagram.getCanvas() // this cannot be part of the method chain
diagram.setColor('#5599FF').setPointSize(5).drawLineChart() // call the methods in a method chain

This works with the methods of the classes Point and PointList, as well:

const maxY = pointList.addPoints(pointA, pointB).sort().getMaximumY()

Of course, you do not have to use this technique.