For mouse clicks, the display will be zoomed-in such that the map centre is the position of the mouse click and the map width and height are calculated as:
{@code len = len.old / z} where {@code z} is the linear zoom increment (>= 1.0)The tool also responds to the user drawing a box on the map mapPane with mouse click-and-drag to define the zoomed-in area. @author Michael Bedward @since 2.6 @source $URL$ @version $Id$
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