[GRASS-dev] G_point_in_region() ?

[Hamish]

Before I add one to libgis, does anyone know if there is an existing lib
function that will test if a coordinate pair is inside or outside the
current region?


e.g.

/* is e,n in the current region? */
int point_in_region(double easting, double northing)
{
    struct Cell_head window;

    G_get_window(&window);

    return point_in_window(easting, northing, window);
}

/* use directly when speed is important or for eg point in map */
int point_in_window(double easting, double northing,
		    struct Cell_head window)
{
    if ( easting > window.east || easting < window.west ||
	 northing > window.north || northing < window.south)
      return FALSE;

    return TRUE;
}



a C question:

  if (FALSE && G_something()) 

will stop as soon as it tests the first term (FALSE) and won't execute
G_something(), does OR work the same way?

  if(TRUE || G_something())

is there a chance G_somthing() will get run in the OR case?
(the first term will know if the G_() call will be valid)


thanks,
Hamish