ChartDirector 6.0 (C++ Edition)

QChartViewer.needUpdateImageMap


Usage

bool needUpdateImageMap();

Description

Determines if the current viewPortChanged signal requires image map update.

The signal handler for a QChartViewer.viewPortChanged signal can use this method to determine if image map update is necessary.

This method is only valid during handling of the viewPortChanged signal. Its behaviour is undefined at other times.

Arguments

None

Return Value

A boolean value that indicates if the viewPortChanged signal requires image map update.