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Constructs a drag control with default settings. The drag control allows the user to pan the map with the mouse by clicking and dragging.

Adds this control to the specified map x, removes this control from its current map, or returns the current map. This method is typically not called directly, but is needed to support the map’s add method and remove methods.

If the argument x is specified, this method returns this. If x is null, this control is removed from its current map; otherwise, this control is added to the specified map. If no arguments are specified, this method returns the current map, which may be null. Whew!

Polymaps is a project from SimpleGeo and Stamen.