NAME

       DPSMTH - Used to draw a curve when fractional coordinates are available and smoothing is
       to be done.

SYNOPSIS

       CALL DPSMTH (XCPF,YCPF,IFVL)

C-BINDING SYNOPSIS

       #include <ncarg/ncargC.h>

       void c_dpsmth (float xcpf, float ycpf, int ifvl);

DESCRIPTION

       XCPF        (an input expression of type REAL) specifies the X coordinate of a point in
                   the fractional coordinate system.  Ignored when IFVL = 2.

       YCPF        (an input expression of type REAL) specifies the Y coordinate of a point in
                   the fractional coordinate system.  Ignored when IFVL = 2.

       IFVL        (an input expression of type INTEGER) indicates what type of call is being
                   done: "0" implies a "first-point" call, "1" implies a "vector" call, and "2"
                   implies a "last-point" or "buffer-flush" call.

C-BINDING DESCRIPTION

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

USAGE

       Use "CALL DPSMTH(XCPF,YCPF,0)" to do a "pen-up" move to the first point in a sequence of
       points defining a curve.

       Use "CALL DPSMTH(XCPF,YCPF,1)" to do "pen-down" moves to the second and following points
       in a sequence of points defining a curve.

       Use "CALL DPSMTH(0.,0.,2) to terminate a sequence of calls, finish drawing the curve, and
       flush internal buffers.

       DPSMTH accumulates points until it has an internal buffer-load or until the last one has
       been received.  It then creates a smooth curve passing through all the points,
       interpolates points along that smooth curve, and passes those points along to the routine
       DPDRAW.  If the internal parameter 'TCS' has a value less than or equal to zero, the
       smoothing is done using simple cubic splines; if 'TCS' has a value greater than zero, the
       smoothing is done using cubic splines under tension and 'TCS' specifies the desired
       tension.

EXAMPLES

       Use the ncargex command to see the following relevant examples: tdshpk.

ACCESS

       To use DPSMTH or c_dpsmth, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c,
       preferably in that order.

SEE ALSO

       Online: dashpack, dashpack_params, dpcurv, dpdraw, dpfrst, dpgetc, dpgeti, dpgetr, dplast,
       dpline, dpsetc, dpseti, dpsetr, dpvect, ncarg_cbind.

       Hardcopy: None.

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.