1TDPRPI(3NCARG)                   NCAR GRAPHICS                  TDPRPI(3NCARG)
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NAME

6       TDPRPI - Given a point in the projection plane, retrieve the
7       parallelogram coordinates of that point in the reference parallelogram
8       (as defined by the last call to TDPARA) that projects into it.  This
9       routine is essentially the inverse of the routine TDPRPA.
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SYNOPSIS

12       CALL TDPRPI (XI2D, YI2D, XIPA, YIPA)
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C-BINDING SYNOPSIS

15       #include <ncarg/ncargC.h>
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17       void c_tdprpi(float xi2d, float yi2d, float *xipa, float *yipa)
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DESCRIPTION

20       The arguments of TDPRPI are as follows:
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22       XI2D and YI2D
23               (input expressions of type REAL) - the coordinates of a point
24               in the projection plane.
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26       XIPA and YIPA
27               (output variables of type REAL) - the parallelogram coordinates
28               of that point in the reference parallelogram that projects into
29               (XI2D,YI2D).  (The parallelogram is as defined by a prior call
30               to TDPARA.)
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C-BINDING DESCRIPTION

33       The C-binding argument descriptions are the same as the FORTRAN
34       argument descriptions.
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ACCESS

37       To use TDPRPI or c_tdprpi, load the NCAR Graphics libraries ncarg,
38       ncarg_gks, and ncarg_c, preferably in that order.
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SEE ALSO

41       Online: tdclrs, tdctri, tddtri, tdgeti, tdgetr, tdgrds, tdgrid, tdgtrs,
42       tdinit, tditri, tdlbla, tdlbls, tdline, tdlnpa, tdmtri, tdotri, tdpack,
43       tdpack_params, tdpara, tdplch, tdprpa, tdprpt, tdseti, tdsetr, tdsort,
44       tdstri, tdstrs
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47       Copyright (C) 1987-2009
48       University Corporation for Atmospheric Research
49       The use of this Software is governed by a License Agreement.
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53UNIX                               July 1997                    TDPRPI(3NCARG)
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