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fire.c
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fire.c
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#include <signal.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#define INPUT_BUFFER_SIZE 4096
#define LINES 24
#define COLUMNS 80
#define ESC "\x1B"
#define BEL "\x07"
#define SS2 ESC "N"
#define OSC ESC "]"
#define CSI ESC "["
static int color(int value)
{
int palette[] = { 16, 52, 88, 124, 160, 196, 202, 208, 214, 220, 15};
//int palette[] = { 16, 22, 28, 34, 40, 46, 82, 118, 154, 190, 15};
if (value >= 254)
value = 254;
value /= (255 / (sizeof(palette) / sizeof(int) - 1));
return palette[value];
}
int main(int argc, char **argv)
{
srand(time(NULL));
printf(OSC "0;FIRE" BEL, argc);
printf(CSI "2J");
printf(CSI "?25l");
unsigned int fire[LINES][COLUMNS];
memset(fire, 0, sizeof(fire));
int i, j;
int frame = 0;
for (;;)
{
int lbeg = rand() % COLUMNS;
int lend = lbeg + (rand() % (COLUMNS - lbeg));
if (frame % (rand() % 50 + 1) == 0) {
for (j = 0; j < LINES / 2; j++) {
for (i = lbeg; i < lend; i++) {
if (i < 4 || i > COLUMNS - 4)
fire[j][i] = 0;
else
fire[j][i] = 0.25 * (rand() % 4) * 1024;
}
}
}
int oldcolor = 0;
int newcolor;
for (j = 1; j < LINES; j++) {
printf(CSI "%d;0H", LINES - j);
for (i = 0; i < COLUMNS; i++) {
fire[j][i] += fire[j-1][i-1];
fire[j][i] += fire[j-1][i];
fire[j][i] += fire[j-1][i+1];
fire[j][i] /= 4.2 + (rand() % 4) / (1.0 * j);
newcolor = color(fire[j][i]);
if (newcolor != oldcolor)
printf(CSI "48;5;%dm ", newcolor);
else
printf(" ");
oldcolor = newcolor;
}
}
fflush(stdout);
usleep(100000);
frame++;
}
return 0;
}