/usr/share/ncarg/hluex/ngmath/nm03c.c is in libncarg-data 6.4.0-9.
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* $Id: nm03c.c,v 1.10 2010-03-15 22:49:24 haley Exp $
*/
/************************************************************************
* *
* Copyright (C) 1997 *
* University Corporation for Atmospheric Research *
* All Rights Reserved *
* *
************************************************************************/
/*
* File: nm03c.c
*
* Author: Mary Haley (taken from one of Fred Clare's examples)
* National Center for Atmospheric Research
* PO 3000, Boulder, Colorado
*
* Date: Fri Dec 12 09:43:32 MST 1997
*
* Description: How to compute aspects and slopes.
*/
#include <math.h>
#include <stdio.h>
#include <ncarg/gks.h>
#include <ncarg/ncargC.h>
#include <ncarg/hlu/hlu.h>
#include <ncarg/ngmath.h>
/*
* Include a header file for each object created
*/
#include <ncarg/hlu/App.h>
#include <ncarg/hlu/NcgmWorkstation.h>
#include <ncarg/hlu/PSWorkstation.h>
#include <ncarg/hlu/PDFWorkstation.h>
#include <ncarg/hlu/CairoWorkstation.h>
#include <ncarg/hlu/ScalarField.h>
#include <ncarg/hlu/ContourPlot.h>
#include <ncarg/hlu/VectorPlot.h>
#define NumIn 171
#define NumXOut 21
#define NumYOut 21
#define RAD2DEG 57.29578
extern void drwsrfc (int nx, int ny, float *x, float *y, float *z,
float s1, float s2, float s3);
int main(int argc, char *argv[])
{
/*
* Coordinate data are defined as random numbers between
* -0.2 and 1.2. and are explicitly defined here for uniformity
* across platforms.
*/
float x[] = {
1.16, 0.47, 0.29, 0.72, 0.52, 1.12, 0.33, 0.20, 0.30,
0.78, 0.92, 0.52, 0.44, 0.22, -0.10, 0.11, 0.59, 1.13,
0.68, 1.11, 0.93, 0.29, 0.74, 0.43, 0.87, 0.87, -0.10,
0.26, 0.85, 0.00, -0.02, 1.01, -0.12, 0.65, 0.39, 0.96,
0.39, 0.38, 0.94, -0.03, -0.17, 0.00, 0.03, 0.67, -0.06,
0.82, -0.03, 1.08, 0.37, 1.02, -0.11, -0.13, 1.03, 0.61,
0.26, 0.18, 0.62, 0.42, 1.03, 0.72, 0.97, 0.08, 1.18,
0.00, 0.69, 0.10, 0.80, 0.06, 0.82, 0.20, 0.46, 0.37,
1.16, 0.93, 1.09, 0.96, 1.00, 0.80, 0.01, 0.12, 1.01,
0.48, 0.79, 0.04, 0.42, 0.48, -0.18, 1.16, 0.85, 0.97,
0.14, 0.40, 0.78, 1.12, 1.19, 0.68, 0.65, 0.41, 0.90,
0.84, -0.11, -0.01, -0.02, -0.10, 1.04, 0.58, 0.61, 0.12,
-0.02, -0.03, 0.27, 1.17, 1.02, 0.16, -0.17, 1.03, 0.13,
0.04, -0.03, 0.15, 0.00, -0.01, 0.91, 1.20, 0.54, -0.14,
1.03, 0.93, 0.42, 0.36, -0.10, 0.57, 0.22, 0.74, 1.15,
0.40, 0.82, 0.96, 1.09, 0.42, 1.13, 0.24, 0.51, 0.60,
0.06, 0.38, 0.15, 0.59, 0.76, 1.16, 0.02, 0.86, 1.14,
0.37, 0.38, 0.26, 0.26, 0.07, 0.87, 0.90, 0.83, 0.09,
0.03, 0.56, -0.19, 0.51, 1.07, -0.13, 0.99, 0.84, 0.22
};
float y[] = {
-0.11, 1.07, 1.11, -0.17, 0.08, 0.09, 0.91, 0.17, -0.02,
0.83, 1.08, 0.87, 0.46, 0.66, 0.50, -0.14, 0.78, 1.08,
0.65, 0.00, 1.03, 0.06, 0.69, -0.16, 0.02, 0.59, 0.19,
0.54, 0.68, 0.95, 0.30, 0.77, 0.94, 0.76, 0.56, 0.12,
0.05, -0.07, 1.01, 0.61, 1.04, -0.07, 0.46, 1.07, 0.87,
0.11, 0.63, 0.06, 0.53, 0.95, 0.78, 0.48, 0.45, 0.77,
0.78, 0.29, 0.38, 0.85, -0.10, 1.17, 0.35, 1.14, -0.04,
0.34, -0.18, 0.78, 0.17, 0.63, 0.88, -0.12, 0.58, -0.12,
1.00, 0.99, 0.45, 0.86, -0.15, 0.97, 0.99, 0.90, 0.42,
0.61, 0.74, 0.41, 0.44, 1.08, 1.06, 1.18, 0.89, 0.74,
0.74, -0.06, 0.00, 0.99, 0.03, 1.00, -0.04, 0.24, 0.65,
0.12, 0.13, -0.09, -0.05, 1.03, 1.07, -0.02, 1.18, 0.19,
0.03, -0.03, 0.86, 1.12, 0.38, 0.72, -0.20, -0.08, -0.18,
0.32, 0.13, -0.19, 0.93, 0.81, 0.31, 1.09, -0.03, 1.01,
-0.17, 0.84, -0.11, 0.45, 0.18, 0.23, 0.81, 0.39, 1.09,
-0.05, 0.58, 0.53, 0.96, 0.43, 0.48, 0.96, -0.03, 1.13,
1.16, 0.16, 1.15, 0.57, 0.13, 0.71, 0.35, 1.04, 0.62,
1.03, 0.98, 0.31, 0.70, 0.97, 0.87, 1.14, 0.08, 1.19,
0.88, 1.00, 0.51, 0.03, 0.17, 1.01, 0.44, 0.17, -0.11
};
float z[NumIn];
float *out, xo[NumXOut], yo[NumYOut], xc, yc;
float u[NumXOut][NumYOut], v[NumXOut][NumYOut], uvtmp;
ng_size_t len_dims[2];
int appid,wid,dataid,cnid,vfid,vcid,gkswid;
int srlist, grlist;
int i, j, ier;
const char *wks_type = "ncgm";
/*
* Initialize the high level utility library
*/
NhlInitialize();
/*
* Create an application context. Set the app dir to the current directory
* so the application looks for a resource file in the working directory.
*/
srlist = NhlRLCreate(NhlSETRL);
grlist = NhlRLCreate(NhlGETRL);
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"nm03",NhlappClass,NhlDEFAULT_APP,srlist);
len_dims[0] = 9;
len_dims[1] = 3;
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a meta file workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkMetaName,"./nm03c.ncgm");
NhlCreate(&wid,"nm03Work",
NhlncgmWorkstationClass,NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"x11") || !strcmp(wks_type,"X11")) {
/*
* Create an X workstation.
*/
NhlRLClear(srlist);
NhlRLSetInteger(srlist,NhlNwkPause,True);
NhlCreate(&wid,"nm03Work",NhlcairoWindowWorkstationClass,NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkPSFileName,"./nm03c.ps");
NhlCreate(&wid,"nm03Work",NhlpsWorkstationClass,NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkPDFFileName,"./nm03c.pdf");
NhlCreate(&wid,"nm03Work",NhlpdfWorkstationClass,NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"pdf") || !strcmp(wks_type,"PDF") ||
!strcmp(wks_type,"ps") || !strcmp(wks_type,"PS")) {
/*
* Create a cairo PS/PDF workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkFileName,"./nm03c");
NhlRLSetString(srlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"nm03Work",NhlcairoDocumentWorkstationClass,NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkFileName,"./nm03c");
NhlRLSetString(srlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"nm03Work",NhlcairoImageWorkstationClass,NhlDEFAULT_APP,srlist);
}
for (i = 0 ; i < NumIn ; i++) {
z[i] = (x[i]-0.25)*(x[i]-0.25) + (y[i]-0.50)*(y[i]-0.50);
}
xc = 1./(NumXOut-1.);
for( i = 0; i < NumXOut; i++ ) {
xo[i] = i * xc;
}
yc = 1./(NumYOut-1.);
for( i = 0; i < NumYOut; i++ ) {
yo[i] = i * yc;
}
/*
* Turn on gradient estimate calculations, flag calculation of
* aspects and slopes, set flag to return aspects and slopes in
* radians.
*/
c_nnseti("igr",1);
c_nnseti("sdi",1);
c_nnseti("rad",1);
/*
* Do the interpolation.
*/
out = c_natgrids(NumIn, y, x, z, NumYOut, NumXOut, yo, xo, &ier);
if (ier != 0) {
printf (" Error return from c_natgrids = %d\n",ier);
}
/*
* Get Workstation ID.
*/
NhlRLClear(grlist);
NhlRLGetInteger(grlist,NhlNwkGksWorkId,&gkswid);
NhlGetValues(wid,grlist);
/*
* There's no HLU object for surface plots yet, so we need to call the
* LLUs to get a surface plot.
*/
gactivate_ws (gkswid);
drwsrfc(NumYOut,NumXOut,yo,xo,out,10.,-25.,50.);
gdeactivate_ws (gkswid);
/*
* Get the aspects.
*/
for (i = 0 ; i < NumXOut ; i++) {
for (j = 0 ; j < NumYOut ; j++) {
c_nngetaspects(i, j, &uvtmp, &ier);
u[i][j] = sin(uvtmp);
v[i][j] = cos(uvtmp);
}
}
/*
* Create a VectorField object; then use its id as the value of
* the 'vcVectorFieldData' resource when creating the VectorPlot object.
*/
len_dims[0] = NumXOut;
len_dims[1] = NumYOut;
NhlRLClear(srlist);
NhlRLSetMDFloatArray(srlist,NhlNvfUDataArray,&v[0][0],2,len_dims);
NhlRLSetMDFloatArray(srlist,NhlNvfVDataArray,&u[0][0],2,len_dims);
NhlCreate(&vfid,"vectorfield",NhlvectorFieldClass,appid,srlist);
NhlRLClear(srlist);
NhlRLSetInteger(srlist,NhlNvcVectorFieldData,vfid);
NhlCreate(&vcid,"VectorPlot",NhlvectorPlotClass,wid,srlist);
NhlDraw(vcid);
NhlFrame(wid);
/*
* Get the slopes.
*/
for (i = 0 ; i < NumXOut ; i++) {
for (j = 0 ; j < NumYOut ; j++) {
c_nngetslopes(i, j, &uvtmp, &ier);
u[i][j] = RAD2DEG*uvtmp;
}
}
/*
* Create a ScalarField data object using the data set defined above.
*/
NhlRLClear(srlist);
len_dims[0] = NumXOut;
len_dims[1] = NumYOut;
NhlRLSetMDFloatArray(srlist,NhlNsfDataArray,&u[0][0],2,len_dims);
NhlCreate(&dataid,"data",NhlscalarFieldClass,appid,srlist);
NhlRLClear(srlist);
NhlRLSetInteger(srlist,NhlNcnScalarFieldData,dataid);
NhlCreate(&cnid,"ContourPlot",NhlcontourPlotClass,wid,srlist);
NhlDraw(cnid);
NhlFrame(wid);
/*
* Destroy the objects created, close the HLU library and exit.
*/
NhlDestroy(vfid);
NhlDestroy(dataid);
NhlDestroy(cnid);
NhlDestroy(wid);
NhlDestroy(appid);
NhlClose();
exit(0);
}
float armn(int, float *);
float armx(int, float *);
/*
* Procedure drwsrfc uses the NCAR Graphics function c_srface to
* draw a surface plot of the data values in z.
*
* The point of observation is calculated from the 3D coordinate
* (s1, s2, s3); the point looked at is the center of the surface.
*
* nx - Dimension of the X-axis variable x.
* ny - Dimension of the Y-axis variable y.
* x - An array of X-axis values.
* y - An array of Y-axis values.
* z - An array dimensioned for nx x ny containing data
* values for each (X,Y) coordinate.
* s1 - X value for the eye position.
* s2 - Y value for the eye position.
* s3 - Z value for the eye position.
* iwk - Work space dimensioned for at least 2*nx*ny.
*
*/
void drwsrfc (int nx, int ny, float *x, float *y, float *z,
float s1, float s2, float s3)
{
float xmn, xmx, ymn, ymx, zmn, zmx, eye[6];
int *iwk;
iwk = (int *)malloc(2*nx*ny*sizeof(int));
/*
* Find the extreme data values.
*/
xmn = armn(nx, x);
xmx = armx(nx, x);
ymn = armn(ny, y);
ymx = armx(ny, y);
zmn = armn(nx * ny, z);
zmx = armx(nx * ny, z);
if ( (s1 == 0.) && (s2 == 0.) && (s3 == 0.) ) {
s1 = -3.;
s2 = -1.5;
s3 = 0.75;
}
eye[0] = 5. * s1 * (xmx-xmn);
eye[1] = 5. * s2 * (ymx-ymn);
eye[2] = 5. * s3 * (zmx-zmn);
eye[3] = 0.5 * (xmx-xmn);
eye[4] = 0.5 * (ymx-ymn);
eye[5] = 0.5 * (zmx-zmn);
/*
* Plot the surface.
*/
c_srface (x,y,z,iwk,nx,nx,ny,eye,0.);
free(iwk);
}
float armn(int num, float *x)
{
int i;
float amin;
amin = x[0];
for (i = 1 ; i < num ; i++)
if (x[i] < amin) amin = x[i];
return(amin);
}
float armx(int num, float *x)
{
int i;
float amax;
amax = x[0];
for (i = 1 ; i < num ; i++)
if (x[i] > amax) amax = x[i];
return(amax);
}
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