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#include "cpgplot.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
static void demo1();
static void demo2();
static void demo3();
/* ---------------------------------------------------------------------
* Demonstration program for PGPLOT called from C.
* (Note that conventions for calling Fortran from C and C from FORTRAN
* are system-dependent).
* Usage:
* cc -c cpgdemo.c
* f77 -o cpgdemo cpgdemo.o -lcpgplot -lpgplot -lX11
*----------------------------------------------------------------------
*/
int main()
{
/*
* Call ppgbeg to initiate PGPLOT and open the output device; cpgbeg
* will prompt the user to supply the device name and type.
*/
if(cpgbeg(0, "?", 1, 1) != 1)
exit(EXIT_FAILURE);
cpgask(1);
/*
* Call each demo.
*/
demo1();
demo2();
demo3();
/*
* Finally, call cpgend to terminate things properly.
*/
cpgend();
return EXIT_SUCCESS;
}
static void demo1()
{
int i;
static float xs[] = {1.0, 2.0, 3.0, 4.0, 5.0 };
static float ys[] = {1.0, 4.0, 9.0, 16.0, 25.0 };
float xr[60], yr[60];
int n = sizeof(xr) / sizeof(xr[0]);
/*
* Call cpgenv to specify the range of the axes and to draw a box, and
* cpglab to label it. The x-axis runs from 0 to 10, and y from 0 to 20.
*/
cpgenv(0.0, 10.0, 0.0, 20.0, 0, 1);
cpglab("(x)", "(y)", "PGPLOT Example 1: y = x\\u2\\d");
/*
* Mark five points (coordinates in arrays XS and YS), using symbol
* number 9.
*/
cpgpt(5, xs, ys, 9);
/*
* Compute the function at 'n=60' points, and use cpgline to draw it.
*/
for(i=0; i<n; i++) {
xr[i] = 0.1*i;
yr[i] = xr[i]*xr[i];
}
cpgline(n, xr, yr);
return;
}
/*----------------------------------------------------------------------
* Demonstration function for PGPLOT contouring routines.
*--------------------------------------------------------------------*/
static void demo2()
{
static int nx = 40, ny = 40;
int i, j, k, lw, ci, ls;
float f[1600], fmin, fmax, alev;
double x, y;
static float tr[6] = {0.0, 1.0, 0.0, 0.0, 0.0, 1.0};
/* Compute a suitable function. A C array is used to emulate
a 2D fortran array f(nx,ny). */
fmin = fmax = 0.0;
for (j=1; j<=ny; j++) {
for (i=1; i<=ny; i++) {
k = (j-1)*nx + (i-1); /* Fortran convention */
x = tr[0] + tr[1]*i + tr[2]*j;
y = tr[3] + tr[4]*i + tr[5]*j;
f[k] = cos(0.3*sqrt(x*2)-0.13333*y)*cos(0.13333*x)+
(x-y)/(double)nx;
if (f[k] < fmin) fmin = f[k];
if (f[k] > fmax) fmax = f[k];
}
}
/* Clear the screen. Set up window and viewport. */
cpgpage();
cpgsvp(0.05, 0.95, 0.05, 0.95);
cpgswin(1.0, (float) nx, 1.0, (float) ny);
cpgbox("bcts", 0.0, 0, "bcts", 0.0, 0);
cpgmtxt("t", 1.0, 0.0, 0.0, "Contouring using cpgcont()");
/* Draw the map. cpgcont is called once for each contour, using
different line attributes to distinguish contour levels. */
cpgbbuf();
for (i=1; i<21; i++) {
alev = fmin + i*(fmax-fmin)/20.0;
lw = (i%5 == 0) ? 3 : 1;
ci = (i < 10) ? 2 : 3;
ls = (i < 10) ? 2 : 1;
cpgslw(lw);
cpgsci(ci);
cpgsls(ls);
cpgcont(f, nx, ny, 1, nx, 1, ny, &alev, -1, tr);
}
cpgslw(1);
cpgsls(1);
cpgsci(1);
cpgebuf();
return;
}
static void demo3()
{
#define TWOPI (2.0*3.14159265)
#define NPOL 6
int i, j, k;
int n1[] = {3, 4, 5, 5, 6, 8};
int n2[] = {1, 1, 1, 2, 1, 3};
float x[10], y[10], y0;
char* lab[] = {"Fill style 1 (solid)",
"Fill style 2 (outline)",
"Fill style 3 (hatched)",
"Fill style 4 (cross-hatched)"};
/* Initialize the viewport and window. */
cpgbbuf();
cpgsave();
cpgpage();
cpgsvp(0.0, 1.0, 0.0, 1.0);
cpgwnad(0.0, 10.0, 0.0, 10.0);
/* Label the graph. */
cpgsci(1);
cpgmtxt("T", -2.0, 0.5, 0.5,
"PGPLOT fill area: routines cpgpoly(), cpgcirc(), cpgrect()");
/* Draw assorted polygons. */
for (k=1; k<5; k++) {
cpgsci(1);
y0 = 10.0 -2.0*k;
cpgtext(0.2, y0+0.6, lab[k-1]);
cpgsfs(k);
for (i=0; i<NPOL; i++) {
cpgsci(i+1);
for (j=0; j<n1[i]; j++) {
x[j] = i+1 + 0.5*cos(n2[i]*TWOPI*j/n1[i]);
y[j] = y0 + 0.5*sin(n2[i]*TWOPI*j/n1[i]);
}
cpgpoly(n1[i], x, y);
}
cpgsci(7);
cpgshs(0.0, 1.0, 0.0);
cpgcirc(7.0, y0, 0.5);
cpgsci(8);
cpgshs(-45.0, 1.0, 0.0);
cpgrect(7.8, 9.5, y0-0.5, y0+0.5);
}
cpgunsa();
cpgebuf();
return;
}
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