C++ Game

Well i have writeen a silly game in C++. I have attached it with the source and even the compiled ones. So please give me suggestions to improve the game. Well to move the misile left and right you need to press the num pad key 4 and 6. And to fire lasers you have to press the space bar. And to quit the game you have to press escape.. I made this using Turbo C++ v3.0

# include <graphics.h>
# include <conio.h>
# include <stdio.h>
# include <dos.h>
# include <iostream.h>
# include <stdlib.h>
# include <time.h>
# include <bios.h>

int a,ra,point=0,counter,ka,q1,q2;
float t1,t2;

timer()
{
long bios_time;
bios_time = biostime(0, 0L);
t1=(bios_time / CLK_TCK);
}
timer1()
{
long bios_time;
bios_time = biostime(0, 0L);
t2=(bios_time / CLK_TCK);
}


ship()
{

randomize();
ra=(rand() % 600);
ka=(rand() % 700);
ra=(ra+ka)/2;
circle(ra,ka,10);

q1=(rand() % 590);
q2=(rand() % 658);
q1=(q1+q2)/2;
circle(q1,q2,10);



}

inig()
{
int gdriver = DETECT, gmode, errorcode;
initgraph(&gdriver, &gmode, "");
}



lin()
{
clearviewport();
gotoxy(2,2);
cout<<" Game designed by Vasanth.M I HND ";
ship();
line(a,450,a,435);
line(a+1,450,a+1,440);
line(a-1,450,a-1,440);
delay(10);
sound(1900);
delay(10);
nosound();
gotoxy(60,30);
cout<<" Your points >> ";
cout<<point;
gotoxy(5,30);
int ti,tq;
timer1();
ti=t2-t1;
tq=60-ti;
cout<<" Units Left >> ";
cout<<tq;
gotoxy(30,30);
cout<<" No of lasers fired >> ";
cout<<counter;

if(ti>59)
{
textmode(C40);
cout<<" Game Over\n";
cout<<" Your Score = ";
cout<<point<<"\n";
cout<<" Number of Lasers Fired = ";
cout<<counter<<"\n";
cout<<" Number of correct hits = ";
int h=(point/10);
cout<<h<<"\n";
cout<<" Number of Misses = ";
cout<<counter-h;

getche();
textmode(C80);
exit(0);
}


}



start()
{

int val;
a=300;
prog:
lin();
val=getche();
if(val==32)
{
counter=counter+1;
for(int w=0;w<600;w=w+20)
{
line(a,450-w,a,450);
delay(10);
}


}
if(val==27)
exit(0);
if(val==52)
{
a=a-10;
lin();
if(a<1)
a=0;

}
if(val==54)
{
a=a+10;
if(a>639)
a=639;
lin();


}
if(val==32)
{

if( ra==a+1 || ra==a+2 || ra==a+3 || ra==a+4 || ra==a-1 || ra==a-2 || ra==a-3 || ra==a-4 || ra==a+5 || ra==a+6 || ra==a+7 || ra==a+8 || ra==a-5 || ra==a-6 || ra==a-7 || ra==a-8 )
{

for(int ex=0;ex<50;ex++)
{
circle(ra,ka,ex);
sound(9000);
delay(50);
nosound();
}
clearviewport();
point=point+10;

}
if( q1==a+1 || q1==a+2 || q1==a+3 || q1==a+4 || q1==a-1 || q1==a-2 || q1==a-3 || q1==a-4 || q1==a+5 || q1==a+6 || q1==a+7 || q1==a+8 || q1==a-5 || q1==a-6 || q1==a-7 || q1==a-8 )
{

for(int ex=0;ex<50;ex++)
{
circle(q1,q2,ex);
sound(9000);
delay(50);
nosound();
}
clearviewport();
point=point+10;

}

}
goto prog;
}






main()
{
clrscr();
timer();
inig();
start();
ship();

}

um, i ran the exe and it doesnt work...i hope this isnt some virus thingy :(

does it work for anyone?

cool game, need to run it from comand prompt tho

Lol, thats a weird game, why'd you make it? what do you have to do

very nice! I enjoyed it. Though you could do the same thing just without Borland's help...gets rid of BGI crap

Thank you.. But i have a little problem with my game.. That is.. When the program waits for the users input to move.. The circles moving also stop.. How do i make them work(move) when the prog is waiting for a input.. And i was also thinking on how to use the arrow keys.. How do i recognize an input from them...
Hope some one can help me..

yeah, thats my prob too, i freeze the program when its waiting for the key to be pressed...please help us!

MY Problem too!!!
anyway , I can help you with your arrow key problem.
The Left arrow key's hexcode is 0x4B.
The Right arrow key's hexcode is 0x4D.
So instead of your values 52 and 54(4 and 6), just say

Code:

---

if(val == 0x4B)//if the key value is the left arrow key

---

actually the input problem is easy...unless you are using delay.
at the end of your little gun moving left or right, just say val=0. then say when your about to move your circle:

Code:

---

while(val == 0)
{
  //randomly move circles
}

---

that way the circles will keep moving unless there is input. then your gun will move and then the circles will start moving again. The problem with this though is that the circles will be moving at an incredible speed. To fix this, you use delay(). But the problem with THAT is that delay() stops everything else when it waits. Thus you cannot do input. someone, we need an alternative for delay()!

instead of delay you should get the record the time to a variable and then have something like this

if(variable holding old time > timeright now-5)
{
continue with game
}

the problem seems to be that first your using io input try this

including these defines

#define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define KEY_UP(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)

and then you can do this if (KEY_DOWN(VK_RIGHT) or say this
if (KEY_UP(VK_LEFT) though im not sure if this will work in a dos based game.

Also you should use a loop instead of goto

what the hell? :X

Remember '#include <graphics.h>'
Borland Turbo....you get the idea.

non-stopping [until you press q]keyboard loop:
It's non-standard tho

Code:

---

#include <conio.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
 int x;
 while(x != 'q')
 {
  while(!kbhit())
  {
  printf("weee");
  }
  if(kbhit())
  {
  x = getch();
  }
 }
 return 0;
}

---

hope it helps. :D

actually we just need an alternative for delay().

Code:

---

sleep(1000);

---

pauses the program for 1000 milliseconds (1 second).

Does not work with DJGPP.

but that still pauses the program

Quote:

---

Originally posted by bluehead
but that still pauses the program

---

okay, here:

Code:

---

int x;
 while(x != 'q') // break out of the loop if the user presses q
 {
  while(!kbhit()) // check  to see if keyboard buffer has anything in it
  {                    // WITHOUT pausing the program to wait
  drawGraphicsBit(); // drawgraphics bit draws the graphics
  sleep(10); // wait 10 ms before drawing next frame
  }
  if(kbhit()) // if the keyboard buffer has stuff in it
  {
  x = getch(); // move the first character from the buffer to int x
  switch(x)
  {
    case 52/*left*/: moveLeft(); break; // moveleft and
    case 54/*right*/:moveRight();break; // moveright move the ship
    case ' '/*space*/:shoot();break;
    default: break;
  }
  }
  /* go back to the beginning of the loop and do next frame */
 }

---

Ok...picture this
You have a little circle bouncing around while a timer goes up one every second(1000 milliseconds). Right now we are trying to figure out how to do that....
like

Code:

---

while(1)
{
      delay(1000);//one second
      counter++;
      printf("Time: %d",counter);
      //do bouncing ball
}

---

Now the problem with this is After the timer goes up one, the ball bounces. We want it to bounce with the timer. Get it? Please help us...we stranded.

okay hang on..I'll cook up some code..I know how to do this..

Code:

---

int microcounter = 0; // the microcounter counts milliseconds
int counter = 0;
while(1)
{
      delay(1);//one ms
      microcounter++;
      if(microcounter == 1000) // 1000 ms = 1 second
      {
        printf("Time: %d",counter);
        counter++; // so add one second to the counter :)
        microcounter = 0; // reset microcounter
      }
      //do bouncing ball
}

---

Understand?

nope...ive tried that. That may work with the bouncing ball, but input? When someone inputs somthing, it doesn't work because its doing delay(1).

No, the character stays in the keyboard buffer until getch() is called, so the delay shouldn't affect it.

#include <all of the #includes.h>

int time;

int main()
{
while (1)
{
while(!khbit())
{
clrscr();
seconds = seconds + 1;
cout<<seconds;
}
while(khbit())
{
}
}

I think this is closer (it will not compile because some functions haven't been done):

Code:

---

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
 int microcounter = 0; // the microcounter counts milliseconds
 int counter = 0;
 int x;
 while(x != 'q') // break out of the loop if the user presses q
 {
  while(!kbhit()) // check  to see if keyboard buffer has anything in it
  {                    // WITHOUT pausing the program to wait
  microcounter += 10;  // add 10 ms to the microcounter because we are pausing 10 ms
  if(microcounter == 1000)
  {
    counter++;
    microcounter = 0;
  }
  drawGraphicsBit(); // drawgraphics bit draws the graphics
  sleep(10); // wait 10 ms before drawing next frame
  }
  if(kbhit()) // if the keyboard buffer has stuff in it
  {
  x = getch(); // move the first character from the buffer to int x
  switch(x)
  {
    case 52/*left*/: moveLeft(); break; // moveleft and
    case 54/*right*/:moveRight();break; // moveright move the ship
    case ' '/*space*/:shoot();break;
    default: break;
  }
  }
  /* go back to the beginning of the loop and do next frame */
 }
}

---

*sigh* Allegro is so much easier than BGI.

he, i have something that works and is alot simpler: in the attachments, tell me if it works

THIS ONE IS BETTER:

>.< i KEEP doing mistakes!!!! here is the attachment

SOWWIE

Muahahahahaha!!!i have solved the problem~!

Nice

thank you, thank you, thank you very much ^_^

Why d'you need that timer anyway?

Its just so that it can go up until you press a key, instead of pausing the program and waiting for input

What are you making with the timer?

But give us the code

It's something like:

Code:

---

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
 int microcounter = 0;
 int counter = 0;
 int x;
 while(!kbhit())
 {                   
  microcounter += 10; 
  if(microcounter == 1000)
  {
    counter++;
    clrscr();
    printf("%d",counter);
    microcounter = 0;
  }
  sleep(10);
 }
 return 0;
}

---

Thank yoo.. I will try implementing it.. It would be great if some one could modify my source to stop the freezing stuff and post it here. So that we can get a better idea.

I don't have BGI on my compiler.

Well i have got another doubt.. THe misile cursor keeps moving from left to right in the bottom screen. Instead of that i want that to be positioned in the middle and only the angle of the cursor should change while shooting. I tried doint this. I kept the value of x and y axis of the bottom point of the cursor a constant. but i could not generate values for x and y for the above point of the cursor so that when it move the cursor make a perfect arc. ANy idea...

You mean so it rotates instead of sliding?

I've been trying to do that with one of my games, I'm not sure how yet, but it's more complicated than it seems.

Ok i want the cursor to move in an circll. With one of it's end fixed.. How do i do it..

Thats matthy and complicated.

I'm still trying to figure it myself.

Ok i got it but what is the HEX value for the up and down arrow key.. I have the hex value only for left and right

to find out, do this:

Code:

---

#include <stdio.h>
#include <conio.h>

int main(void)
{
 int i;
 while(i != 'q')
 {
  i = getch();
  printf("\n%d",i);
 }
 return 0;
}

---

run it, and press any key and it's ascii code will show up on screen.

That will never work with arrow keys. Try it.
Up - 0x48
Down - 0x50

I would be glad to try it out.

I would also be glad if you can do that. that is the game shold not freeze when waiting for the input