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bf_test.c
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183 lines (152 loc) · 4.13 KB
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/*
* This program creates some binary data files used by the demo
* binary.dem to exercise gnuplot's binary input routines.
* This code is not used by gnuplot itself.
*
* Copyright (c) 1992 Robert K. Cunningham, MIT Lincoln Laboratory
*
*/
/*
* Ethan A Merritt July 2014
* Remove dependence on any gnuplot source files
*/
#include <ctype.h>
#include <stdio.h>
#include <math.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#else
# ifdef HAVE_MALLOC_H
# include <malloc.h>
# endif
#endif
static float function (int p, double x, double y);
typedef struct {
float xmin, xmax;
float ymin, ymax;
} range;
#define NUM_PLOTS 2
static range TheRange[] = {{-3,3,-2,2},
{-3,3,-3,3},
{-3,3,-3,3}}; /* Sampling rate causes this to go from -3:6*/
static float
function(int p, double x, double y)
{
float t = 0; /* HBB 990828: initialize */
switch (p) {
case 0:
t = 1.0 / (x * x + y * y + 1.0);
break;
case 1:
t = sin(x * x + y * y) / (x * x + y * y);
if (t > 1.0)
t = 1.0;
break;
case 2:
t = sin(x * x + y * y) / (x * x + y * y);
/* sinc modulated sinc */
t *= sin(4. * (x * x + y * y)) / (4. * (x * x + y * y));
if (t > 1.0)
t = 1.0;
break;
default:
fprintf(stderr, "Unknown function\n");
break;
}
return t;
}
int
fwrite_matrix( FILE *fout, float **m, int xsize, int ysize, float *rt, float *ct)
{
int j;
int status;
float length = ysize;
if ((status = fwrite((char *) &length, sizeof(float), 1, fout)) != 1) {
fprintf(stderr, "fwrite 1 returned %d\n", status);
return (0);
}
fwrite((char *) ct, sizeof(float), ysize, fout);
for (j = 0; j < xsize; j++) {
fwrite((char *) &rt[j], sizeof(float), 1, fout);
fwrite((char *) (m[j]), sizeof(float), ysize, fout);
}
return (1);
}
#define ISOSAMPLES 5.0
int
main(void)
{
int plot;
int i, j;
int im;
float x, y;
float *rt, *ct;
float **m;
int xsize, ysize;
char buf[256];
FILE *fout;
/* Create a few standard test interfaces */
for (plot = 0; plot < NUM_PLOTS; plot++) {
xsize = (TheRange[plot].xmax - TheRange[plot].xmin) * ISOSAMPLES + 1;
ysize = (TheRange[plot].ymax - TheRange[plot].ymin) * ISOSAMPLES + 1;
sprintf(buf, "binary%d", plot + 1);
if (!(fout = fopen(buf, "wb"))) {
fprintf(stderr, "Could not open output file\n");
return EXIT_FAILURE;
}
rt = calloc(xsize, sizeof(float));
ct = calloc(ysize, sizeof(float));
m = calloc(xsize, sizeof(m[0]));
for (im = 0; im < xsize; im++) {
m[im] = calloc(ysize, sizeof(m[0][0]));
}
for (y = TheRange[plot].ymin, j = 0; j < ysize; j++, y += 1.0 / (double) ISOSAMPLES) {
ct[j] = y;
}
for (x = TheRange[plot].xmin, i = 0; i < xsize; i++, x += 1.0 / (double) ISOSAMPLES) {
rt[i] = x;
for (y = TheRange[plot].ymin, j = 0; j < ysize; j++, y += 1.0 / (double) ISOSAMPLES) {
m[i][j] = function(plot, x, y);
}
}
fwrite_matrix(fout, m, xsize, ysize, rt, ct);
free(rt);
free(ct);
for (im = 0; im < xsize; im++)
free(m[im]);
free(m);
}
/* Show that it's ok to vary sampling rate, as long as x1<x2, y1<y2... */
sprintf(buf, "binary%d", plot + 1);
if (!(fout = fopen(buf, "wb"))) {
fprintf(stderr, "Could not open output file\n");
return EXIT_FAILURE;
}
xsize = (TheRange[plot].xmax - TheRange[plot].xmin) * ISOSAMPLES + 1;
ysize = (TheRange[plot].ymax - TheRange[plot].ymin) * ISOSAMPLES + 1;
rt = calloc(xsize, sizeof(float));
ct = calloc(ysize, sizeof(float));
m = calloc(xsize, sizeof(m[0]));
for (im = 0; im < xsize; im++) {
m[im] = calloc(ysize, sizeof(m[0][0]));
}
for (y = TheRange[plot].ymin, j = 0; j < ysize; j++, y += 1.0 / (double) ISOSAMPLES) {
ct[j] = y > 0 ? 2 * y : y;
}
for (x = TheRange[plot].xmin, i = 0; i < xsize; i++, x += 1.0 / (double) ISOSAMPLES) {
rt[i] = x > 0 ? 2 * x : x;
for (y = TheRange[plot].ymin, j = 0; j < ysize; j++, y += 1.0 / (double) ISOSAMPLES) {
m[i][j] = function(plot, x, y);
}
}
fwrite_matrix(fout, m, xsize, ysize, rt, ct);
free(rt);
free(ct);
for (im = 0; im < xsize; im++)
free(m[im]);
free(m);
return 0;
}