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C mapfunc.f
C
C VIS-5D version 3.1 */
C
C vis5d program for visualizing five dimensional gridded data sets
C Copyright (C) 1990, 1991, 1992, 1993 Bill Hibbard, Brian Paul,
C Dave Santek, and Andre Battaiola.
C
C This program is free software; you can redistribute it and/or modify
C it under the terms of the GNU General Public License as published by
C the Free Software Foundation; either version 1, or (at your option)
C any later version.
C
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
C GNU General Public License for more details.
C
C You should have received a copy of the GNU General Public License
C along with this program; if not, write to the Free Software
C Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
C
C
C FORTRAN subroutine to transform map line vertices. This is
C called from the newmap.c program.
C
C
SUBROUTINE TRANSFORM( OLDLAT, OLDLON, NEWLAT, NEWLON )
C Input/Output arguments are in degrees:
REAL*4 OLDLAT, OLDLON, NEWLAT, NEWLON
C Some local variables:
REAL*4 LAT, LON, LAT2, LON2, ANGLE
C Example: Rotate a map by 10 degrees clockwise about an origin
C in Wisconsin.
C Move Wisconsin to origin:
LAT = OLDLAT - 43.0
LON = OLDLON - 90.0
C Rotate by 10 degrees:
ANGLE = 10 * 3.14159 / 180.0
LAT2 = LON * SIN(ANGLE) + LAT * COS(ANGLE)
LON2 = LON * COS(ANGLE) - LAT * SIN(ANGLE)
C Translate back to Wisconsin
NEWLAT = LAT2 + 43.0
NEWLON = LON2 + 90.0
RETURN
END
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