Handles drag zooming of charts on a {@link ChartCanvas}. This handler should be configured with the required modifier keys and installed as a live handler (not an auxiliary handler). This handler only works for a
ChartCanvas that is embedded in a {@link ChartViewer}, since it relies on the
ChartViewer for drawing the zoom rectangle.
THE API FOR THIS CLASS IS SUBJECT TO CHANGE IN FUTURE RELEASES. This is so that we can incorporate feedback on the (new) JavaFX support in JFreeChart.
@since 1.0.18