/*                     PONG GAME v1.0
 		   Made By  Gaurang Sinha
 		    gaurang85.tripod.com		

	Score 1		       |		Score 2
	-----------------------|-----------------------
Player1			       |                       Player2
			       |      o
    Bat2|		       |                      |Bat1
	|		       |                      |
			       |
			       |
Pos2	_______________________|_______________________  Pos1

   If any one can stop the ball from framing so much during
   runtime, i would be highly obliged if you could email at
   gaurang85@hotmail.com staing how you have achieved this. */

/*--------------------INCLUDE FILES-------------------*/
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<stdlib.h>
#include<dos.h>

/*--------------------CONSTANTS--------------------*/
#define ENTER 13
#define SPACE 32
#define BACK 8
#define ESC 0x1b
#define UP 0x48
#define DOWN 0x50
#define LEFT 0x4b
#define RIGHT 0x4d

/*--------------------PROTOTYPES--------------------*/
void scores();
void ball(int,int);
void bat2(int);
void bat1(int);
void refresh();
void move();
void play();
void ai2();
/*--------------------GLOBAL VARIABLES--------------------*/
int score1=0,score2=0,pos1,pos2,xb,yb,xb1,yb1,side=1,dir=0,X,Y,wins,ai=0;
/*side=1 <-ball going to Player1*/
/*side=2 ->ball going to Player2*/
/*dir=1 - ball is moving in an upward direction*/
/*dir=0	- ball is moving in a downward direction*/
/*--------------------MAIN FUNCTION--------------------*/
int main()
{
int gd=DETECT,gm;
char c;
clrscr();
initgraph(&gd,&gm,"C:\\TC\\BGI");
//StartUp Screen
settextstyle(1,0,9); setcolor(9);
outtextxy(80,40,"PONG");
settextstyle(1,0,4); setcolor(12);
outtextxy(350,150,"By Gaurang Sinha");
settextstyle(1,0,3); setcolor(WHITE);
outtextxy(230,240,"Instructions");
settextstyle(1,0,2);
outtextxy(100,260,"Player 1");outtextxy(400,260,"Player 2");
outtextxy(110,280,"UP - w");outtextxy(410,280,"UP - up arrow");
outtextxy(110,300,"DOWN - s");outtextxy(410,300,"DOWN - down arrow");
outtextxy(200,340,"To Play 1 Player Mode ... Press C");
outtextxy(240,380,"QUIT - ESC");
outtextxy(200,420,"Press any key to continue ... ");
c=getch();if(c=='c'||c=='C')ai=1;
cleardevice();
//Game Screen
setbkcolor(BLACK);
setcolor(WHITE);
X=getmaxx();
Y=getmaxy();
pos1=pos2=Y/2;		/*Set both the bats to the center of the screen*/
line(0,50,X,50);
line(0,Y-10,X,Y-10);
line(X/2,0,X/2,Y-10);
scores();
xb=xb1=320;yb=yb1=240;
ball(xb,yb);
bat2(pos1);
bat1(pos2);

move();

getch();
closegraph();
return 0;
}

/*--------------------Other FUNCTIONS--------------------*/
void ball(int i,int j)
{
	setcolor(BLACK); circle(xb1,yb1,10);               //Clear Previous
	setfillstyle(1,BLACK); fillellipse(xb1,yb1,9,9);  //ball position
	setcolor(RED); circle(i,j,10);               //Draw new
	setfillstyle(1,RED); fillellipse(i,j,9,9);  //ball position
	refresh();
}

void bat1(int i)	//Right Hand Side
{
   setlinestyle(0,0,3);
   setcolor(BLACK);
   line(630,50,630,470);
   setcolor(RED);
   line(630,i-15,630,i+15);
}

void bat2(int i)	//Left Hand Side
{
   setlinestyle(0,0,3);
   setcolor(BLACK);
   line(0,50,0,470);
   setcolor(RED);
   line(0,i-15,0,i+15);
}

void scores()
{
   gotoxy(70,1); printf("         ");
   gotoxy(70,1); printf("Score2: %d",score2);
   gotoxy(3,1);  printf("         ");
   gotoxy(3,1);  printf("Score1: %d",score1);
}


void move()
{
char a;
while(a!=ESC)
{
a=0;
if(ai!=0){ai2();}
if(kbhit())
{
	a=getch();
	if(ai==0)
	{	if(a==UP&&pos1>65)
		{ pos1=pos1-10;bat1(pos1);}
		if(a==DOWN&&pos1<470)
		{ pos1=pos1+10;bat1(pos1);}	}
	if(a=='w'&&pos2>65)
	{pos2=pos2-10;bat2(pos2);}
	if(a=='s'&&pos2<470)
	{pos2=pos2+10;bat2(pos2);}
}
	if(side==1)
	{
	if(xb>=15)
	{
		if(yb<65){yb=yb+5;dir=0;}
		else if(yb>450){yb=yb-5;dir=1;}
		else
		{	if(dir==1){yb=yb-5;xb=xb-5;}
			if(dir==0){yb=yb+5;xb=xb-5;}
		}
		ball(xb,yb);
		xb1=xb;yb1=yb;
	if(xb==15){if(yb<pos2+15&&yb>pos2-15){side=2;}else{score2++;wins=2;a=ESC;}}
	}
	}
	if(side==2)
	{
	if(xb<=615)
	{
		if(yb<65){yb=yb+5;dir=0;}
		else if(yb>450){yb=yb-5;dir=1;}
		else
		{	if(dir==1){yb=yb-5;xb=xb+5;}
			if(dir==0){yb=yb+5;xb=xb+5;}
		}
		ball(xb,yb);
		xb1=xb;yb1=yb;
	if(xb==615){if(yb<pos1+15&&yb>pos1-15){side=1;}else{score1++;wins=1;a=ESC;}}
	}
	}
   }
play();
}

void refresh()
{
setcolor(WHITE);
line(0,50,X,50);
line(0,Y-10,X,Y-10);
line(X/2,0,X/2,Y-10);
scores();
}

void play()
{
char p;
cleardevice();
settextstyle(1,0,3); setcolor(RED);
if(wins==1)outtextxy(280,150,"Player 1 Wins ");
if(wins==2)outtextxy(280,150,"Player 2 Wins ");
outtextxy(200,200,"Do you want to play again ? (Y/N) ");
p=getch();
if(p=='y'||p=='Y')
{
	setbkcolor(BLACK);
	pos1=pos2=Y/2;		/*Set both the bats to the center of the screen*/
	line(0,50,X,50);
	line(0,Y-10,X,Y-10);
	line(X/2,0,X/2,Y-10);
	scores();
	xb=xb1=320;yb=yb1=240;
	ball(xb,yb);
	bat2(pos1);
	bat1(pos2);
	move();
}
else if(p=='n'||p=='N')
{
	exit;
}
}

void ai2()
{
//pos1=yb;      This looked very lame so i changed the code a wee bit !!!
//bat1(pos1);
if(side==2)
{
	if(pos1<yb){pos1=pos1+5;}
	if(pos1>yb){pos1=pos1-5;}
}
bat1(pos1);
}