[VB]	Public Sub updateViewPort(needUpdateChart As Boolean, needUpdateImageMap As Boolean)
[C#]	public void updateViewPort(bool needUpdateChart, bool needUpdateImageMap);

Triggers the ViewPortChanged event.

WinChartViewer may fire ViewPortChanged events when the mouse clicks or drags on the plot area (see WinChartViewer.MouseUsage). WinChartViewer also allows external objects (such as scroll bars, navigation buttons, timers, etc) to modify the view port. This method allows external objects to request WinChartViewer to fire ViewPortChanged events.

Many controls are able to update the view port continuously as they are used. For example, a scroll bar may update the view port continuously as the mouse drags on it. For these cases, the chart display may be updated continuously as the view port changes. However, the image map does not need to update until the scrolling is completed (when the mouse button is released on the scroll bar and the mouse moves over the chart surface).

The needUpdateChart argument and needUpdateImageMap argument allows one to specify if the event requires a chart update, and/or an image map update.

For charts with a lot of hot spots and tool tips, the CPU power needed to handle the image map may not be negligible. Removing unnecessary image map updates may increase the update rate when the chart is being updated continuously.

Argument	Default	Description
needUpdateChart	(Mandatory)	A boolean value to indicate if the chart needs to be updated.
needUpdateImageMap	(Mandatory)	A boolean value to indicate if the image map needs to be updated.

None