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#include <ncurses.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define COLOR_DARK_BLUE "\033[38;5;19m" // cell value 4 (Dark Blue)
#define COLOR_MED_BLUE "\033[38;5;33m" // cell value 3 (Medium Blue)
#define COLOR_LIGHT_BLUE "\033[38;5;81m" // cell value 2 (Light Blue)
#define COLOR_ICE_BLUE "\033[38;5;195m" // cell value 1 (Very Light Blue)
struct sandpile {
size_t rows;
size_t columns;
size_t *cells;
size_t *next;
bool paused;
size_t steps;
};
static void init_sandpile(struct sandpile *sandpile);
static void destroy_sandpile(struct sandpile *sandpile);
static void add_grain(struct sandpile *sandpile);
static void update_sandpile(struct sandpile *sandpile);
static void draw_sandpile(struct sandpile *sandpile);
static void draw_status(struct sandpile *sandpile);
static bool handle_input(struct sandpile *sandpile);
int main(void)
{
struct sandpile sandpile;
if (initscr() == NULL) {
fprintf(stderr, "Failed to init ncurses screen");
}
if (has_colors()) {
start_color();
use_default_colors();
// colors
init_pair(1, COLOR_GREEN, COLOR_BLACK);
init_pair(2, COLOR_YELLOW, COLOR_BLACK);
init_pair(3, COLOR_CYAN, COLOR_BLACK);
init_pair(4, COLOR_WHITE, COLOR_BLACK);
}
cbreak();
noecho();
keypad(stdscr, true);
nodelay(stdscr, true);
curs_set(0);
init_sandpile(&sandpile);
bool running = true;
while (running) {
if (!sandpile.paused) {
add_grain(&sandpile);
}
update_sandpile(&sandpile);
draw_sandpile(&sandpile);
running = handle_input(&sandpile);
}
destroy_sandpile(&sandpile);
endwin();
return 0;
}
static void init_sandpile(struct sandpile *sandpile)
{
// gets screen dimensions
getmaxyx(stdscr, sandpile->rows, sandpile->columns);
sandpile->rows -= 1;
sandpile->columns /= 2;
sandpile->cells =
calloc(sandpile->rows * sandpile->columns, sizeof(size_t));
sandpile->next =
calloc(sandpile->rows * sandpile->columns, sizeof(size_t));
sandpile->paused = false;
sandpile->steps = 0;
erase();
}
static void destroy_sandpile(struct sandpile *sandpile)
{
free(sandpile->cells);
free(sandpile->next);
}
static void add_grain(struct sandpile *sandpile)
{
sandpile->cells[(sandpile->rows / 2) * sandpile->columns +
(sandpile->columns / 2)] += 1;
}
static void update_sandpile(struct sandpile *sandpile)
{
// clear next to all 0s
memset(sandpile->next, 0,
sandpile->rows * sandpile->columns * sizeof(size_t));
// calculating new positions
for (size_t row = 0; row < sandpile->rows; row++) {
for (size_t column = 0; column < sandpile->columns; column++) {
size_t value =
sandpile->cells[row * sandpile->columns + column];
size_t topples = value / 4;
sandpile->next[row * sandpile->columns + column] +=
value % 4;
if (column > 0) {
sandpile->next[row * sandpile->columns +
column - 1] += topples;
}
if (column + 1 < sandpile->columns) {
sandpile->next[row * sandpile->columns +
column + 1] += topples;
}
if (row > 0) {
sandpile->next[(row - 1) * sandpile->columns +
column] += topples;
}
if (row + 1 < sandpile->rows) {
sandpile->next[(row + 1) * sandpile->columns +
column] += topples;
}
}
}
size_t *tmp = sandpile->cells;
sandpile->cells = sandpile->next;
sandpile->next = tmp;
sandpile->steps++;
}
static void draw_status(struct sandpile *sandpile)
{
char status[256];
snprintf(status, sizeof(status), "STEP: %zu %s", sandpile->steps,
sandpile->paused ? "PAUSED" : "RUNNING");
attron(A_REVERSE);
move(0, 0);
mvaddnstr(0, 0, status, sandpile->columns);
for (int column = (int)strlen(status); column < sandpile->columns * 2;
column++) {
mvaddch(0, column, ' ');
}
attroff(A_REVERSE);
}
static void draw_sandpile(struct sandpile *sandpile)
{
char pixel;
size_t color_pair = 0;
bool is_bold = false;
for (size_t row = 0; row < sandpile->rows; row++) {
for (size_t column = 0; column < sandpile->columns; column++) {
// grab pixel value from array
size_t value =
sandpile->cells[row * sandpile->columns + column];
// set color and ASCII character
if (value == 0) {
color_pair = 4;
pixel = ' ';
} else if (value == 1) {
color_pair = 4;
pixel = '.';
is_bold = false;
} else if (value == 2) {
color_pair = 3;
pixel = ':';
is_bold = false;
} else if (value == 3) {
color_pair = 2;
pixel = '#';
is_bold = true;
} else {
color_pair = 1;
pixel = '@';
is_bold = true;
}
if (color_pair > 0) {
attron(COLOR_PAIR(color_pair));
if (is_bold) {
attron(A_BOLD);
}
}
mvaddch(row + 1, column * 2, pixel);
mvaddch(row + 1, column * 2 + 1, pixel);
if (color_pair > 0) {
attroff(COLOR_PAIR(color_pair));
if (is_bold) {
attroff(A_BOLD);
}
}
}
}
draw_status(sandpile);
refresh();
}
static bool handle_input(struct sandpile *sandpile)
{
int key = getch();
switch (key) {
case 'q':
case 'Q':
return false;
case ' ':
case 'p':
case 'P':
sandpile->paused = !sandpile->paused;
break;
// case 'r':
// case 'R':
// destroy_sandpile(sandpile);
// break;
default:
break;
}
return true;
}
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