man WMDRRG (3): plots weather map regions (indicating snow, rain, etc.), or

SYNOPSIS

CALL WMDRRG(N,X,Y,ITYPE,NC,XC,YC)

C-BINDING SYNOPSIS

#include <ncarg/gks.h>

void c_wmdrrg(int n, float *x, float *y, char *itype, int nc, float *xc, float *yc)

DESCRIPTION

N

(Integer, Input) - The number of points supplied in the second and third arguments.

X

(Real, Input) - The X coordinates (specified in world coordinates) of N points that specify the control points of a spline curve that will be fitted to represent the requested region.

Y

(Real, Input) - The Y coordinates (specified in world coordinates) of N points that specify the control points of a spline curve that will be fitted to represent the requested region.

ITYPE

(Character, Input) - Indicates the weather type to fill the region with, or a solid color.

ITYPE can be one of:

'T' for thunderstorms

'SH' for showers

'R' for rain

'F' for flurries

'SN' for snow

'I' for ice

'INDEXnn' where the number "nn" denotes a color index for a solid fill.

NC

(Integer, input) - If NC is greater than 2, then the region resulting from the spline fit to ((X(I),Y(I)),I=1,N) will be clipped against the region in ((XC(I),YC(I)),I=1,NC). If no clipping is to be done, then set NC equal to 1.

XC

(Real, Input) - The X coordinates (specified in world coordinates) of NC points that specify a clipping polygon for the region resulting from the spline fit to ((X(I),Y(I)),I=1,N), if NC is greater than 2.

YC

(Real, Input) - The Y coordinates (specified in world coordinates) of NC points that specify a clipping polygon for the region resulting from the spline fit to ((X(I),Y(I)),I=1,N), if NC is greater than 2.

USAGE

Set the values for the appropriate internal parameters before calling WMDRRG to produce the desired region. The internal parameters that control the appearance of regions are: COL and RHT. As mentioned above, the points specified in the X and Y arrays serve as control points for a spline curve that is fitted to the input polygon. X(N) should equal X(1) and Y(N) should equal Y(1).

ACCESS

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

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