/usr/share/ncarg/hluex/streamlineplot/st02c.c is in libncarg-data 6.3.0-6build1.
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* $Id: st02c.c,v 1.4 2010-03-15 22:49:24 haley Exp $
*/
/***********************************************************************
* *
* Copyright (C) 1993 *
* University Corporation for Atmospheric Research *
* All Rights Reserved *
* *
***********************************************************************/
/*
* File: st02c.c
*
* Author: David Brown
* National Center for Atmospheric Research
* PO 3000, Boulder, Colorado
*
* Date: Wed Apr 3 17:00:55 MST 1996
*
* Description: Given a simple mathematically generated data set,
* demonstrates line-drawn streamline arrows and the use
* of some basic StreamlinePlot resources
*/
#include <math.h>
#include <ncarg/gks.h>
#include <ncarg/ncargC.h>
#include <ncarg/hlu/hlu.h>
#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/StreamlinePlot.h>
#define M 25
#define N 30
#define PI 3.14159
int main(int argc, char *argv[])
{
char const *wks_type = "x11";
int appid,wid,stid,vfid;
int rlist,grlist;
ng_size_t len_dims[2];
float stepsize,arrowlength,spacing;
float U[N][M],V[N][M];
/*
* Generate vector data arrays
*/
{
float igrid, jgrid;
int i,j;
igrid = 2.0 * PI / (float) M;
jgrid = 2.0 * PI / (float) N;
for (j = 0; j < N; j++) {
for (i = 0; i < M; i++) {
U[j][i] = 10.0 * cos(jgrid * (float) j);
V[j][i] = 10.0 * cos(igrid * (float) i);
}
}
}
/*
* 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.
*/
rlist = NhlRLCreate(NhlSETRL);
grlist = NhlRLCreate(NhlGETRL);
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"st02",NhlappClass,NhlDEFAULT_APP,rlist);
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a meta file workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkMetaName,"./st02c.ncgm");
NhlCreate(&wid,"st02Work",
NhlncgmWorkstationClass,NhlDEFAULT_APP,rlist);
}
else if (!strcmp(wks_type,"x11") || !strcmp(wks_type,"X11")) {
/*
* Create an X workstation.
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNwkPause,True);
NhlCreate(&wid,"st02Work",NhlcairoWindowWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPSFileName,"st02c.ps");
NhlCreate(&wid,"st02Work",NhlpsWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPDFFileName,"st02c.pdf");
NhlCreate(&wid,"st02Work",NhlpdfWorkstationClass,appid,rlist);
}
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(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"st02c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"st02Work",NhlcairoDocumentWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"st02c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"st02Work",NhlcairoImageWorkstationClass,appid,rlist);
}
/*
* Create a VectorField data object using the data set defined above.
* By default the array bounds will define the data boundaries (zero-based,
* as in C language conventions)
*/
len_dims[0] = N;
len_dims[1] = M;
NhlRLClear(rlist);
NhlRLSetMDFloatArray(rlist,NhlNvfUDataArray,&U[0][0],2,len_dims);
NhlRLSetMDFloatArray(rlist,NhlNvfVDataArray,&V[0][0],2,len_dims);
NhlCreate(&vfid,"vectorfield",NhlvectorFieldClass,appid,rlist);
/*
* Create a StreamlinePlot object, supplying the VectorField object as data
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,
"Modifying StreamlinePlot resources");
NhlRLSetInteger(rlist,NhlNstVectorFieldData,vfid);
NhlCreate(&stid,"streamlineplot",NhlstreamlinePlotClass,wid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Get the values of several resources that are set dynamically based
* on the assumed NDC size of a grid cell. Each of this will be separately
* modified in the course of this example to illustrate their effect.
*/
NhlRLClear(grlist);
NhlRLGetFloat(grlist,NhlNstStepSizeF,&stepsize);
NhlRLGetFloat(grlist,NhlNstArrowLengthF,&arrowlength);
NhlRLGetFloat(grlist,NhlNstMinLineSpacingF,&spacing);
NhlGetValues(stid,grlist);
/*
* Increase the step size
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Larger Step Size");
NhlRLSetFloat(rlist,NhlNstStepSizeF,stepsize * 4.0);
NhlSetValues(stid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Decrease the step size
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Smaller Step Size");
NhlRLSetFloat(rlist,NhlNstStepSizeF,stepsize * 0.25);
NhlSetValues(stid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Increase the minimum line spacing
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Larger Minimum Line Spacing");
NhlRLSetFloat(rlist,NhlNstStepSizeF,stepsize);
NhlRLSetFloat(rlist,NhlNstMinLineSpacingF, spacing * 4.0);
NhlSetValues(stid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Decrease the minimum line spacing
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Smaller Minimum Line Spacing");
NhlRLSetFloat(rlist,NhlNstMinLineSpacingF,spacing * 0.25);
NhlSetValues(stid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Increase the line starting grid stride
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Larger Line Starting Grid Stride");
NhlRLSetFloat(rlist,NhlNstMinLineSpacingF,spacing);
NhlRLSetInteger(rlist,NhlNstLineStartStride,3);
NhlSetValues(stid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Decrease the line starting grid stride
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Smaller Line Starting Grid Stride");
NhlRLSetInteger(rlist,NhlNstLineStartStride,1);
NhlSetValues(stid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Increase the arrow size
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Larger Arrows");
NhlRLSetInteger(rlist,NhlNstLineStartStride,2);
NhlRLSetFloat(rlist,NhlNstArrowLengthF, arrowlength * 2.0);
NhlSetValues(stid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Destroy the objects created, close the HLU library and exit.
*/
NhlDestroy(appid);
NhlClose();
exit(0);
}
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