Sets the image map that defines the hot spots on the chart image.
The CChartViewer control uses an ImageMapHandler object to handle the image map. Please refer to the documentation on
ImageMapHandler on how the image map is processed.
If an image map is defined for a chart, the CChartViewer control will display tool tips for the hot spots when the mouse is over the hot spots. Furthermore, the mouse cursor will change to a "hand" shape to provide visual feedback if the mouse is over a clickable hot spot. A clickable hot spot is defined as a hot spot with a non-empty path attribute.
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