Expose msMapOffsetExtent, msMapScaleExtent and msMapSetCenter to the PHP API

[tamas]

The following functions have been exposed to SWIG and should also be updated in the PHP API

mapObj.offsetExtent( float x, float y) : int

Offset the map extent based on the given distances in map coordinates, returns MS_SUCCESS or MS_FAILURE.

mapObj.scaleExtent( float zoomfactor, float minscaledenom, float maxscaledenom) : int

Scale the map extent using the zoomfactor and ensure the extent within the minscaledenom and maxscaledenom domain. If minscaledenom and/or maxscaledenom is 0 then the parameter is not taken into account. returns MS_SUCCESS or MS_FAILURE.

mapObj.setCenter( pointObj_ center ) : int

Set the map center to the given map point, returns MS_SUCCESS or MS_FAILURE.

The corresponding C API functions are: MS_DLL_EXPORT int msMapOffsetExtent( mapObj *map, double x, double y); MS_DLL_EXPORT int msMapScaleExtent( mapObj *map, double zoomfactor,

double minscaledenom, double maxscaledenom);

MS_DLL_EXPORT int msMapSetCenter( mapObj *map, pointObj *center);