For mouse clicks, the display will be zoomed-out 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)
@author Michael Bedward
@author Andrea Antonello (www.hydrologis.com)
@since 2.6
@source $URL$
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