box-o-sand/PracticingCurses/JustForFun/life.c

#include <curses.h>

int STARTX = 0;
int STARTY = 0;
int ENDX = 79;
int ENDY = 24;

#define CELL_CHAR '#'
#define TIME_OUT  300

typedef struct _state {
    int oldstate;
    int newstate;
}state;

void display(WINDOW *win, state **area, int startx, int starty, int endx, int endy);
void calc(state **area, int x, int y);
void update_state(state **area, int startx, int starty, int endx, int endy);

int main()
{    state **workarea;
    int i, j;

    initscr();
    cbreak();
    timeout(TIME_OUT);
    keypad(stdscr, TRUE);

    ENDX = COLS - 1;
    ENDY = LINES - 1;

    workarea = (state **)calloc(COLS, sizeof(state *));
    for(i = 0;i < COLS; ++i)
        workarea[i] = (state *)calloc(LINES, sizeof(state));

    /* For inverted U */
    workarea[39][15].newstate = TRUE;
    workarea[40][15].newstate = TRUE;
    workarea[41][15].newstate = TRUE;
    workarea[39][16].newstate = TRUE;
    workarea[39][17].newstate = TRUE;
    workarea[41][16].newstate = TRUE;
    workarea[41][17].newstate = TRUE;
    update_state(workarea, STARTX, STARTY, ENDX, ENDY);

    /* For block  */
/*
    workarea[37][13].newstate = TRUE;
    workarea[37][14].newstate = TRUE;
    workarea[38][13].newstate = TRUE;
    workarea[38][14].newstate = TRUE;

    update_state(workarea, STARTX, STARTY, ENDX, ENDY);
*/
    display(stdscr, workarea, STARTX, STARTY, ENDX, ENDY);
    while(getch() != KEY_F(1))
    {    for(i = STARTX; i <= ENDX; ++i)
            for(j = STARTY; j <= ENDY; ++j)
                calc(workarea, i, j);
        update_state(workarea, STARTX, STARTY, ENDX, ENDY);
        display(stdscr,  workarea, STARTX, STARTY, ENDX, ENDY);
    }

    endwin();
    return 0;
}

void display(WINDOW *win, state **area, int startx, int starty, int endx, int endy)
{    int i, j;
    wclear(win);
    for(i = startx; i <= endx; ++i)
        for(j = starty;j <= endy; ++j)
            if(area[i][j].newstate == TRUE)
                mvwaddch(win, j, i, CELL_CHAR);
    wrefresh(win);
}

void calc(state **area, int i, int j)
{    int neighbours;
    int newstate;

    neighbours    =
        area[(i - 1 + COLS) % COLS][j].oldstate        +
        area[(i - 1 + COLS) % COLS][(j - 1 + LINES) % LINES].oldstate     +
        area[(i - 1 + COLS) % COLS][(j + 1) % LINES].oldstate     +
        area[(i + 1) % COLS][j].oldstate        +
        area[(i + 1) % COLS][(j - 1 + LINES) % LINES].oldstate     +
        area[(i + 1) % COLS][(j + 1) % LINES].oldstate     +
        area[i][(j - 1 + LINES) % LINES].oldstate        +
        area[i][(j + 1) % LINES].oldstate;

    newstate = FALSE;
    if(area[i][j].oldstate == TRUE && (neighbours == 2 || neighbours == 3))
         newstate = TRUE;
    else
        if(area[i][j].oldstate == FALSE && neighbours == 3)
             newstate = TRUE;
    area[i][j].newstate = newstate;
}

void update_state(state **area, int startx, int starty, int endx, int endy)
{    int i, j;

    for(i = startx; i <= endx; ++i)
        for(j = starty; j <= endy; ++j)
            area[i][j].oldstate = area[i][j].newstate;
}