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include <math.h>
# The dimensionality.
define N_DIM 2
# Define some memory management.
define ONER Memr[$1+$2-1]
# sp_rotate - Rotate a vector.
#
# History
# 8Mar91 - Created by Jonathan D. Eisenhamer, STScI.
#---------------------------------------------------------------------------
procedure sp_rotate( x, y, npts, angle, nx, ny )
real x[npts], y[npts] # I: The vectors to rotate.
int npts # I: The number of points in the vectors.
real angle # I: The angle to rotate (radians).
real nx[npts], ny[npts] # O: The translated vectors.
# Declarations
pointer center # To specify the center.
pointer mw # MWCS structure.
pointer sp # Stack pointer.
# Function prototypes.
pointer mw_open(), mw_sctran()
begin
# Suck some memory.
call smark( sp )
call salloc( center, N_DIM, TY_REAL )
mw = mw_open( NULL, N_DIM )
ONER(center,1) = 0.
ONER(center,2) = 0.
call mw_rotate( mw, -DEGTORAD( angle ), ONER(center,1), 3b )
call mw_v2tranr( mw_sctran( mw, "physical", "logical", 3b ),
x, y, nx, ny, npts )
call mw_close( mw )
call sfree( sp )
end
#---------------------------------------------------------------------------
# End of sp_rotate
#---------------------------------------------------------------------------
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