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io_ascii.c
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Created
Sun, Aug 18, 07:34
Size
1 KB
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text/x-c
Expires
Tue, Aug 20, 07:34 (2 d)
Engine
blob
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Handle
19978782
Attached To
rSCINTROPARALLEL Poisson code for introduction to parallelism
io_ascii.c
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#include "io_ascii.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
/* -------------------------------------------------------------------------- */
int write_to_file(int n, float ** x, unsigned int iter, float minval,
float maxval) {
FILE * fp;
char filename[256];
char prefix[] = "out_";
char suffix[] = ".pgm";
char number[5];
int i, j, lines;
int v;
strcpy(filename, prefix);
sprintf(number, "%u", iter);
while (iter < 1000) {
strcat(filename, "0");
if (iter == 0)
iter = 1;
iter *= 10;
}
strcat(filename, number);
strcat(filename, suffix);
fp = fopen(filename, "w");
if (fp == NULL) {
fprintf(stderr, "Can't open output file %s!\n", filename);
exit(1);
}
fprintf(fp, "%s\n%s\n", "P2", "# CREATOR: poisson program");
fprintf(fp, "%d %d\n", n, n);
fprintf(fp, "%d\n", 255);
lines = 4;
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
v = (int)roundf(255 * (x[i][j] - minval) / (maxval - minval));
v = v <= 255 ? v : 255;
fprintf(fp, "%d \n", (int)(v));
lines++;
}
}
fclose(fp);
printf("%d lines written to file %s\n", lines, filename);
return 0;
}
/* -------------------------------------------------------------------------- */
int colormap(int n) {
FILE * fp;
int i, j;
double v;
fp = fopen("colormap.pgm", "w");
fprintf(fp, "%s\n%s\n", "P2", "# CREATOR: poisson program");
fprintf(fp, "%d %d\n", 20, n);
fprintf(fp, "%d\n", 255);
for (j = 0; j < n; j++) {
v = (int)roundf(255.0 * j / (n - 1));
for (i = 0; i < 20; i++) {
fprintf(fp, "%d \n", (int)(v));
}
}
fclose(fp);
return 0;
}
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