setZoomDirection(direction)

Sets the zoom direction for mouse zoom in/out actions.

In zoom operations for charts, it is common to restrict zooming to one direction only. For example, in a chart plotting temperature against time, zooming in from a yearly chart to a daily chart may mean the time axis (x-axis) is zoomed in by 36500%, while the temperature axis (y-axis) may be auto-scaled and not zoomed in at all. The user may be surprise if you also zoom in the y-axis by 36500%, in which case the chart may become hardly readable.

This method allows you to determine the zoom direction for mouse zoom actions (see JsChartViewer.setMouseUsage), specified using the following predefined constants:

Constant	Value	Description
JsChartViewer.Horizontal	0	Zoom actions apply to horizontal direction only.
JsChartViewer.Vertical	1	Zoom actions apply to vertical direction only.
JsChartViewer.HorizontalVertical	2	Zoom actions apply to both horizontal and vertical directions.

Argument	Default	Description
direction	(Mandatory)	The zoom direction for mouse zoom actions.

None