#include <stdlib.h>
#include <time.h>
#include <gtk/gtk.h>
#define ROWS 20
#define COLS 30
const double pi = 3.141592653589793;
const int size = 20;
int field1[COLS][ROWS];
int field2[COLS][ROWS];
GtkWidget *drawing_area;
GtkWidget *toggle_button;
int get_cell(int x, int y) {
x = (x + COLS)%COLS;
y = (y + ROWS)%ROWS;
return field1[x][y];
}
gboolean timeout(gpointer data) {
if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(toggle_button))) {
for(int i = 0; i < COLS; ++i) {
for(int j = 0; j < ROWS; ++j) {
int count = 0;
count += get_cell(i-1, j-1);
count += get_cell(i-1, j);
count += get_cell(i-1, j+1);
count += get_cell(i, j-1);
count += get_cell(i, j+1);
count += get_cell(i+1, j-1);
count += get_cell(i+1, j);
count += get_cell(i+1, j+1);
if (field1[i][j]) {
field2[i][j] = (count == 2 || count == 3);
} else {
field2[i][j] = (count == 3);
}
}
}
for(int i = 0; i < COLS; ++i)
for(int j = 0; j < ROWS; ++j)
field1[i][j] = field2[i][j];
gtk_widget_queue_draw(drawing_area);
}
return TRUE;
}
gboolean draw(GtkWidget *widget, cairo_t *cr, gpointer data) {
cairo_set_source_rgba(cr, 0.9, 0.9, 0.9, 1);
cairo_paint(cr);
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1);
for(int i = 0; i <= COLS; ++i) {
cairo_move_to(cr, i*size, 0.0);
cairo_line_to(cr, i*size, ROWS*size);
}
for(int j = 0; j < ROWS; ++j) {
cairo_move_to(cr, 0.0, j*size);
cairo_line_to(cr, COLS*size, j*size);
}
cairo_stroke(cr);
for(int i = 0; i < COLS; ++i) {
for(int j = 0; j < ROWS; ++j) {
if (field1[i][j]) {
cairo_arc(cr, (i + 0.5)*size, (j + 0.5)*size, 0.5*size, 0.0, 2.0*pi);
cairo_fill(cr);
}
}
}
return TRUE;
}
gboolean button_press(GtkWidget *widget, GdkEventButton *event, gpointer data) {
int x = (int)(event->x)/size;
int y = (int)(event->y)/size;
if (x >= 0 && y >= 0 && x < COLS && y < ROWS) {
field1[x][y] = !field1[x][y];
gtk_widget_queue_draw(drawing_area);
}
return TRUE;
}
void activate(GtkApplication* app, gpointer data) {
srand(time(NULL));
GtkWidget *window = gtk_application_window_new (app);
GtkWidget *hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 10);
gtk_container_add(GTK_CONTAINER(window), hbox);
drawing_area = gtk_drawing_area_new();
gtk_widget_set_size_request(GTK_WIDGET(drawing_area), COLS*size, ROWS*size);
gtk_widget_set_hexpand(drawing_area, TRUE);
gtk_widget_add_events(drawing_area, GDK_BUTTON_PRESS_MASK);
g_signal_connect(drawing_area, "draw", G_CALLBACK(draw), NULL);
g_signal_connect(drawing_area, "button-press-event", G_CALLBACK(button_press), NULL);
gtk_container_add(GTK_CONTAINER(hbox), drawing_area);
toggle_button = gtk_toggle_button_new_with_label("Start/Stop");
gtk_widget_set_valign(toggle_button, GTK_ALIGN_START);
gtk_container_add(GTK_CONTAINER(hbox), toggle_button);
gtk_widget_show_all(window);
g_timeout_add(100, timeout, NULL);
}
int main(int argc, char **argv) {
GtkApplication *application = gtk_application_new(NULL, 0);
g_signal_connect(application, "activate", G_CALLBACK(activate), NULL);
int status = g_application_run(G_APPLICATION(application), argc, argv);
g_object_unref(application);
return status;
}