pacman.c

/****************************************************
* Pacman For Console V1.2                           *
* By: Rev. Dr. Mike Billars (doctormike@gmail.com)  *
* Date: 2006-12-12                                  *
*                                                   *
* Please see file COPYING for details on licensing  *
*       and redistribution of this program          *
*                                                   *
****************************************************/

#include <stdio.h>
#include <curses.h>
#include <string.h>
#include <stdlib.h>
#include <sys/timeb.h>
#include "pacman.h"

#define EXIT_MSG "Good bye!"
#define END_MSG "Game Over"
#define QUIT_MSG "Bye"
#define LEVEL_ERR "Cannot find level file: "

void IntroScreen();                                 //Show introduction screen and menu
void CheckCollision();                              //See if Pacman and Ghosts collided
void CheckScreenSize();                             //Make sure resolution is at least 32x29
void CreateWindows(int y, int x, int y0, int x0);   //Make ncurses windows
void Delay();                                       //Slow down game for better control
void DrawWindow();                                  //Refresh display
void ExitProgram(const char *message);              //Exit and display something
void GetInput();                                    //Get user input
void InitCurses();                                  //Start up ncurses
void LoadLevel(char *levelfile);                    //Load level into memory
void MainLoop();                                    //Main program function
void MoveGhosts();                                  //Update Ghosts' location
void MovePacman();                                  //Update Pacman's location
void PauseGame();                                   //Pause

//For ncurses
WINDOW * win;
WINDOW * status;

//For colors
enum { Wall = 1, Normal, Pellet, PowerUp, GhostWall, Ghost1, Ghost2, Ghost3, Ghost4, BlueGhost, Pacman };

//I know global variables are bad, but it's just sooo easy!
int Loc[5][2] = { 0 };					//Location of Ghosts and Pacman
int Dir[5][2] = { 0 };					//Direction of Ghosts and Pacman
int StartingPoints[5][2] = { 0 };			//Default location in case Pacman/Ghosts die
int Invincible = 0;					//Check for invincibility
int Food = 0;						//Number of pellets left in level
int Level[29][28] = { 0 };				//Main level array
int LevelNumber = 0;					//What level number are we on?
int GhostsInARow = 0;					//Keep track of how many points to give for eating ghosts
int tleft = 0;						//How long left for invincibility

int main(int argc, char *argv[]) {

	int j = 0;
	srand( (unsigned)time( NULL ) );

	InitCurses();
	CheckScreenSize();
	CreateWindows(29, 28, 1, 1);

	//If they specified a level to load
	if((argc > 1) && (strlen(argv[1]) > 1)) {
		LoadLevel(argv[1]);
		MainLoop();
	}
        
	//If not, display intro screen then use default levels
	else {
		//Show intro "movie"
		IntroScreen();

		j = 1;
		//They want to start at a level 1-9
		if(argc > 1)
			for(LevelNumber = '1'; LevelNumber <= '9'; LevelNumber++)
				if(LevelNumber == argv[1][0]) j = LevelNumber - '0';

		//Load 9 levels, 1 by 1, if you can beat all 9 levels in a row, you're awesome
		for(LevelNumber = j; LevelNumber < 10; LevelNumber++) {
			LevelFile[strlen(LevelFile) - 6] = '0';
			LevelFile[strlen(LevelFile) - 5] = LevelNumber + '0';
			LoadLevel(LevelFile);
			Invincible = 0;			//Reset invincibility
			MainLoop();
		}

	}

	ExitProgram(EXIT_MSG);
}

void CheckCollision() {
	int a = 0;
	for(a = 0; a < 4; a++) {
		//Collision
		if((Loc[a][0] == Loc[4][0]) && (Loc[a][1] == Loc[4][1])) {

			//Ghost dies
			if(Invincible == 1) {
				Points = Points + GhostsInARow * 20;
				mvwprintw(win, Loc[4][0], Loc[4][1] - 1, "%d", (GhostsInARow * 20));
				GhostsInARow *= 2;
				wrefresh(win);

				usleep(1000000);

				Loc[a][0] = StartingPoints[a][0]; Loc[a][1] = StartingPoints[a][1];
			}

			//Pacman dies
			else {
				wattron(win, COLOR_PAIR(Pacman));
				mvwprintw(win, Loc[4][0], Loc[4][1], "X");

				wrefresh(win);

				Lives--;
				usleep(1000000);

				if(Lives == -1) ExitProgram(END_MSG);

				//Reset level
				for(a = 0; a < 5; a++) {
					Loc[a][0] = StartingPoints[a][0];
					Loc[a][1] = StartingPoints[a][1];
				}
				Dir[0][0] =  1; Dir[0][1] =  0;
				Dir[1][0] = -1; Dir[1][1] =  0;
				Dir[2][0] =  0; Dir[2][1] = -1;
				Dir[3][0] =  0; Dir[3][1] =  1;
				Dir[4][0] =  0; Dir[4][1] = -1;

				DrawWindow();

				usleep(1000000);
			}
		}
	}
}

void CheckScreenSize() {
        //Make sure the window is big enough
        int h, w; getmaxyx(stdscr, h, w);
        if((h < 32) || (w < 29)) {
                endwin();
                fprintf(stderr, "\nSorry.\n");
                fprintf(stderr, "To play Pacman for Console, your console window must be at least 32x29\n");
                fprintf(stderr, "Please resize your window/resolution and re-run the game.\n\n");
                exit(0);
        }
}

void CreateWindows(int y, int x, int y0, int x0) {
	win = newwin(y, x, y0, x0);
	status = newwin(3, 27, 29, 1);
}

void Delay() {

	struct timeb t_start, t_current;
	ftime(&t_start);

	//Slow down the game a little bit
	do {
		GetInput();
		ftime(&t_current);
	} while (abs(t_start.millitm - t_current.millitm) < SpeedOfGame);
}

void DrawWindow() {
	int a = 0; int b = 0;
	char chr = ' ';
	int attr;

	//Display level array
	for(a = 0; a < 29; a++) for(b = 0; b < 28; b++) {
		switch(Level[a][b]) {
		case 0: chr = ' '; attr = A_NORMAL; wattron(win, COLOR_PAIR(Normal));    break;
		case 1: chr = ' '; attr = A_NORMAL; wattron(win, COLOR_PAIR(Wall));      break;
		case 2: chr = '.'; attr = A_NORMAL; wattron(win, COLOR_PAIR(Pellet));    break;
		case 3: chr = '*'; attr = A_BOLD;   wattron(win, COLOR_PAIR(PowerUp));   break;
		case 4: chr = ' '; attr = A_NORMAL; wattron(win, COLOR_PAIR(GhostWall)); break;
		}
		mvwaddch(win, a, b, chr | attr);
	}

	//Display number of lives, score, and level
	attr = A_NORMAL;
	wmove(status, 1, 1);
	wattron(status, COLOR_PAIR(Pacman));
	for(a = 0; a < Lives; a++)
		wprintw(status, "C ");
	wprintw(status, "  ");
	wattron(status, COLOR_PAIR(Normal));
	mvwprintw(status, 2, 2, "Level: %d     Score: %d ", LevelNumber, Points);
	wrefresh(status);

	//Display ghosts
	if(Invincible == 0) {
		wattron(win, COLOR_PAIR(Ghost1)); mvwaddch(win, Loc[0][0], Loc[0][1], '&');
		wattron(win, COLOR_PAIR(Ghost2)); mvwaddch(win, Loc[1][0], Loc[1][1], '&');
		wattron(win, COLOR_PAIR(Ghost3)); mvwaddch(win, Loc[2][0], Loc[2][1], '&');
		wattron(win, COLOR_PAIR(Ghost4)); mvwaddch(win, Loc[3][0], Loc[3][1], '&');
	}

	//OR display vulnerable ghosts
	else {
		wattron(win, COLOR_PAIR(BlueGhost));
		mvwaddch(win, Loc[0][0], Loc[0][1], tleft + '0');
		mvwaddch(win, Loc[1][0], Loc[1][1], tleft + '0');
		mvwaddch(win, Loc[2][0], Loc[2][1], tleft + '0');
		mvwaddch(win, Loc[3][0], Loc[3][1], tleft + '0');
	}

	//Display Pacman
	wattron(win, COLOR_PAIR(Pacman)); mvwaddch(win, Loc[4][0], Loc[4][1], 'C');

	wrefresh(win);
}

void ExitProgram(const char *message) {
	endwin();
	printf("%s\n", message);
	exit(0);
}

void GetInput() {
	int ch;
	static int chtmp;

	ch = getch();

	//Buffer input
	if(ch == ERR) ch = chtmp;
	chtmp = ch;

	switch (ch) {
		case KEY_UP:    case 'w': case 'W':
			if((Level[(Loc[4][0]-1) % 29][Loc[4][1]] != 1)
			&& (Level[(Loc[4][0]-1) % 29][Loc[4][1]] != 4))
				{ Dir[4][0] = -1; Dir[4][1] =  0; }
			break;

		case KEY_DOWN:  case 's': case 'S':
			if((Level[(Loc[4][0]+1) % 29][Loc[4][1]] != 1)
			&& (Level[(Loc[4][0]+1) % 29][Loc[4][1]] != 4))
				{ Dir[4][0] =  1; Dir[4][1] =  0; }
			break;

		case KEY_LEFT:  case 'a': case 'A':
			if((Level[Loc[4][0]][(Loc[4][1]-1) % 28] != 1)
			&& (Level[Loc[4][0]][(Loc[4][1]-1) % 28] != 4))
				{ Dir[4][0] =  0; Dir[4][1] = -1; }
			break;

		case KEY_RIGHT: case 'd': case 'D':
			if((Level[Loc[4][0]][(Loc[4][1]+1) % 28] != 1)
			&& (Level[Loc[4][0]][(Loc[4][1]+1) % 28] != 4))
				{ Dir[4][0] =  0; Dir[4][1] =  1; }
			break;

		case 'p': case 'P':
			PauseGame();
			chtmp = getch();
			break;

		case 'q': case 'Q':
			ExitProgram(QUIT_MSG);
			break;

	}
}

void InitCurses() {
	initscr();
	start_color();
	curs_set(0);
	keypad(stdscr, TRUE);
	nodelay(stdscr, TRUE);
	nonl();
	cbreak();
	noecho();

	init_pair(Normal,    COLOR_WHITE,   COLOR_BLACK);
	init_pair(Wall,      COLOR_WHITE,   COLOR_WHITE);
	init_pair(Pellet,    COLOR_WHITE,   COLOR_BLACK);
	init_pair(PowerUp,   COLOR_BLUE,    COLOR_BLACK);
	init_pair(GhostWall, COLOR_WHITE,   COLOR_CYAN);
	init_pair(Ghost1,    COLOR_RED,     COLOR_BLACK);
	init_pair(Ghost2,    COLOR_CYAN,    COLOR_BLACK);
	init_pair(Ghost3,    COLOR_MAGENTA, COLOR_BLACK);
	init_pair(Ghost4,    COLOR_YELLOW,  COLOR_BLACK);
	init_pair(BlueGhost, COLOR_BLUE,    COLOR_RED);
	init_pair(Pacman,    COLOR_YELLOW,  COLOR_BLACK);
}

void IntroScreen() {
	int a = 0;
	int b = 23;

	a=getch();
	a=getch();
	a=getch();

	mvwprintw(win, 20, 8, "Press any key...");

	//Scroll Pacman to middle of screen
	for(a = 0; a < 13; a++) {
		if(getch()!=ERR) return;
		wattron(win, COLOR_PAIR(Pacman));
		mvwprintw(win, 8, a, " C");
		wrefresh(win);
		usleep(100000);
	}

	//Show "Pacman"
	wattron(win, COLOR_PAIR(Pacman));
	mvwprintw(win, 8, 12, "PACMAN");
	wrefresh(win);
	usleep(1000000);

	//Ghosts Chase Pacman
	for(a = 0; a < 23; a++) {
		if(getch()!=ERR) return;
		wattron(win, COLOR_PAIR(Pellet)); mvwprintw(win, 13, 23, "*");
		wattron(win, COLOR_PAIR(Pacman)); mvwprintw(win, 13, a, " C");
		wattron(win, COLOR_PAIR(Ghost1)); mvwprintw(win, 13, a-3, " &");
		wattron(win, COLOR_PAIR(Ghost3)); mvwprintw(win, 13, a-5, " &");
		wattron(win, COLOR_PAIR(Ghost2)); mvwprintw(win, 13, a-7, " &");
		wattron(win, COLOR_PAIR(Ghost4)); mvwprintw(win, 13, a-9, " &");
		wrefresh(win);
		usleep(100000);
	}

	usleep(150000);

	//Pacman Chases Ghosts
	for(a = 25; a > 2; a--) {
		if(getch()!=ERR) return;
		wattron(win, COLOR_PAIR(Pellet)); mvwprintw(win, 13, 23, " ");

		//Make ghosts half as fast
		if(a%2) b--;

		wattron(win, COLOR_PAIR(BlueGhost)); mvwprintw(win, 13, b-9, "& & & &");
		wattron(win, COLOR_PAIR(Pacman)); mvwprintw(win, 13, b-9+1, " ");
		wattron(win, COLOR_PAIR(Pacman)); mvwprintw(win, 13, b-9+3, " ");
		wattron(win, COLOR_PAIR(Pacman)); mvwprintw(win, 13, b-9+5, " ");
		wattron(win, COLOR_PAIR(Pacman)); mvwprintw(win, 13, b-9+7, " ");
		wattron(win, COLOR_PAIR(Pacman)); mvwprintw(win, 13, a-3, "C          ");

		wattron(win, COLOR_PAIR(Pellet)); mvwprintw(win, 13, 23, " ");
		wrefresh(win);
		usleep(100000);
	}

}

void LoadLevel(char *levelfile) {

	int a = 0; int b = 0;
	size_t l;
	char error[sizeof(LEVEL_ERR)+255] = LEVEL_ERR;
	FILE *fin;
	Food = 0;

	//Reset defaults
	Dir[0][0] =  1; Dir[0][1] =  0;
	Dir[1][0] = -1; Dir[1][1] =  0;
	Dir[2][0] =  0; Dir[2][1] = -1;
	Dir[3][0] =  0; Dir[3][1] =  1;
	Dir[4][0] =  0; Dir[4][1] = -1;

	//Open file
	fin = fopen(levelfile, "r");

	//Make sure it didn't fail
	if(!(fin)) {
		l = sizeof(error)-strlen(error)-1;
		strncat(error, levelfile, l);
		if(strlen(levelfile) > l)
			error[sizeof(error)-2] = '.', error[sizeof(error)-3] = '.', error[sizeof(error)-4] = '.';
		ExitProgram(error);
	}

	//Open file and load the level into the array
	for(a = 0; a < 29; a++) {
		for(b = 0; b < 28; b++) {
			fscanf(fin, "%d", &Level[a][b]);
			if(Level[a][b] == 2) Food++;

			if(Level[a][b] == 5) { Loc[0][0] = a; Loc[0][1] = b; Level[a][b] = 0; }
			if(Level[a][b] == 6) { Loc[1][0] = a; Loc[1][1] = b; Level[a][b] = 0; }
			if(Level[a][b] == 7) { Loc[2][0] = a; Loc[2][1] = b; Level[a][b] = 0; }
			if(Level[a][b] == 8) { Loc[3][0] = a; Loc[3][1] = b; Level[a][b] = 0; }
			if(Level[a][b] == 9) { Loc[4][0] = a; Loc[4][1] = b; Level[a][b] = 0; }
		}
	}

	fscanf(fin, "%d", &LevelNumber);

	//Save initial character points for if Pacman or Ghosts die
	for(a = 0; a < 5; a++)
		StartingPoints[a][0] = Loc[a][0], StartingPoints[a][1] = Loc[a][1];

}

void MainLoop() {

	DrawWindow();
	wrefresh(win);
	wrefresh(status);
	usleep(1000000);

	do {
		MovePacman();	DrawWindow();	CheckCollision();
		MoveGhosts();	DrawWindow();	CheckCollision();
		if(Points > FreeLife) { Lives++; FreeLife *= 2;}
		Delay();

	} while (Food > 0);

	DrawWindow();
	usleep(1000000);

}

void MoveGhosts() {
	int a = 0; int b = 0; int c = 0;
	int tmpx = 0;  int tmpy = 0;
	int tmpdx = 0; int tmpdy = 0;
	int checksides[] = { 0, 0, 0, 0, 0, 0 };
	static int SlowerGhosts = 0;

	if(Invincible == 1) {
		SlowerGhosts++;
		if(SlowerGhosts > HowSlow)
			SlowerGhosts = 0;
	}

	if((Invincible == 0) || SlowerGhosts < HowSlow)

	//Loop through each ghost
	for(a = 0; a < 4; a++) {

		//Switch sides?
		     if((Loc[a][0] ==  0) && (Dir[a][0] == -1)) Loc[a][0] = 28;
		else if((Loc[a][0] == 28) && (Dir[a][0] ==  1)) Loc[a][0] =  0;
		else if((Loc[a][1] ==  0) && (Dir[a][1] == -1)) Loc[a][1] = 27;
		else if((Loc[a][1] == 27) && (Dir[a][1] ==  1)) Loc[a][1] =  0;
		else {

		//Determine which directions we can go
		for(b = 0; b < 4; b++) checksides[b] = 0;
		if(Level[Loc[a][0] + 1][Loc[a][1]] != 1) checksides[0] = 1;
		if(Level[Loc[a][0] - 1][Loc[a][1]] != 1) checksides[1] = 1;
		if(Level[Loc[a][0]][Loc[a][1] + 1] != 1) checksides[2] = 1;
		if(Level[Loc[a][0]][Loc[a][1] - 1] != 1) checksides[3] = 1;

		//Don't do 180 unless we have to
		c = 0; for(b = 0; b < 4; b++) if(checksides[b] == 1) c++;

		if(c > 1) {
			     if(Dir[a][0] ==  1) checksides[1] = 0;
			else if(Dir[a][0] == -1) checksides[0] = 0;
			else if(Dir[a][1] ==  1) checksides[3] = 0;
			else if(Dir[a][1] == -1) checksides[2] = 0;
		}

		c = 0;
		do {
			//Decide direction
			b = (int)(rand() / (1625000000 / 4));

			if(checksides[b] == 1) {
				     if(b == 0) { Dir[a][0] =  1; Dir[a][1] =  0; }
				else if(b == 1) { Dir[a][0] = -1; Dir[a][1] =  0; }
				else if(b == 2) { Dir[a][0] =  0; Dir[a][1] =  1; }
				else if(b == 3) { Dir[a][0] =  0; Dir[a][1] = -1; }
			}
			else {
				if(Invincible == 0) {
				//Chase Pacman
				     if((Loc[4][0] > Loc[a][0]) && (checksides[0] == 1)) { Dir[a][0] =  1; Dir[a][1] =  0; c = 1; }
				else if((Loc[4][0] < Loc[a][0]) && (checksides[1] == 1)) { Dir[a][0] = -1; Dir[a][1] =  0; c = 1; }
				else if((Loc[4][1] > Loc[a][1]) && (checksides[2] == 1)) { Dir[a][0] =  0; Dir[a][1] =  1; c = 1; }
				else if((Loc[4][1] < Loc[a][1]) && (checksides[3] == 1)) { Dir[a][0] =  0; Dir[a][1] = -1; c = 1; }
				}

				else {
				//Run away from Pacman
				     if((Loc[4][0] > Loc[a][0]) && (checksides[1] == 1)) { Dir[a][0] = -1; Dir[a][1] =  0; c = 1; }
				else if((Loc[4][0] < Loc[a][0]) && (checksides[0] == 1)) { Dir[a][0] =  1; Dir[a][1] =  0; c = 1; }
				else if((Loc[4][1] > Loc[a][1]) && (checksides[3] == 1)) { Dir[a][0] =  0; Dir[a][1] = -1; c = 1; }
				else if((Loc[4][1] < Loc[a][1]) && (checksides[2] == 1)) { Dir[a][0] =  0; Dir[a][1] =  1; c = 1; }
				}
			}

		} while ((checksides[b] == 0) && (c == 0));

		//Move Ghost
		Loc[a][0] += Dir[a][0];
		Loc[a][1] += Dir[a][1];
		}
	}
}

void MovePacman() {

	static int itime = 0;

	//Switch sides?
	     if((Loc[4][0] ==  0) && (Dir[4][0] == -1)) Loc[4][0] = 28;
	else if((Loc[4][0] == 28) && (Dir[4][0] ==  1)) Loc[4][0] =  0;
	else if((Loc[4][1] ==  0) && (Dir[4][1] == -1)) Loc[4][1] = 27;
	else if((Loc[4][1] == 27) && (Dir[4][1] ==  1)) Loc[4][1] =  0;

	//Or
	else {
		//Move Pacman
		Loc[4][0] += Dir[4][0];
		Loc[4][1] += Dir[4][1];

		//If he hit a wall, move back
		if((Level[Loc[4][0]][Loc[4][1]] == 1) || (Level[Loc[4][0]][Loc[4][1]] == 4)) {
			Loc[4][0] -= Dir[4][0];	Loc[4][1] -= Dir[4][1];
		}
	}

	//What is he eating?
	switch (Level[Loc[4][0]][Loc[4][1]]) {
		case 2:	//Pellet
			Level[Loc[4][0]][Loc[4][1]] = 0;
			Points++;
			Food--;
			break;
		case 3:	//PowerUp
			Level[Loc[4][0]][Loc[4][1]] = 0;
			Invincible = 1;
			if(GhostsInARow == 0) GhostsInARow = 1;
			itime = time(0);
			break;
	}

	//Is he invincible?
	if(Invincible == 1)  tleft = (11 - LevelNumber - time(0) + itime);

	//Is invincibility up yet?
	if(tleft < 0) { Invincible = 0; GhostsInARow = 0; tleft = 0; }

}

void PauseGame() {
	int chtmp;

	//Display pause dialog
	wattron(win, COLOR_PAIR(Pacman));
	mvwprintw(win, 12, 10, "********");
	mvwprintw(win, 13, 10, "*PAUSED*");
	mvwprintw(win, 14, 10, "********");
	wrefresh(win);
	
	//And wait
	do {
		chtmp = getch();
	} while (chtmp == ERR);

}