Allegro bitmap collision? how?

I am making a pong game and this is what i got so far

Code:

---

#include <allegro.h>

int x = 5;
int y = 0;
int counter;
int down = 0, up = 0;
int x2 = 615;
int y2 = 0;
int counter2;
int down2 = 0, up2 = 0;
int play1scor = 0;
int play2scor = 0;
int ballx = 300, bally = 190;

void update_counter()
{
    counter++;
}
END_OF_FUNCTION(update_counter);

void update_counter2()
{
    counter2++;
}
END_OF_FUNCTION(update_counter2);

int main()
{
  allegro_init();
  install_keyboard();
 
  LOCK_VARIABLE(counter);
  LOCK_FUNCTION(update_counter);
  install_int_ex( update_counter, BPS_TO_TIMER(60));
 
  LOCK_VARIABLE(counter2);
  LOCK_FUNCTION(update_counter2);
  install_int_ex( update_counter2, BPS_TO_TIMER(60));

  set_color_depth(32);
  set_gfx_mode(GFX_AUTODETECT_FULLSCREEN, 640, 480, 0, 0);

  BITMAP *bar = load_bitmap( "sprite/bar.bmp", NULL );
  BITMAP *logo = load_bitmap( "sprite/logo.bmp", NULL );
  BITMAP *ball = load_bitmap( "sprite/ball.bmp", NULL );
 
  while ( !key[KEY_ESC] )
  {
 
        while ( counter > 0 )
        {
            if (down)  y-=7;
            if (up) y+=7;
            counter--;
        }
        if ( y > 0 && key[KEY_UP])
            down = 1;
        else
            down = 0;
        if ( y < 375 && key[KEY_DOWN])
            up = 1;
        else
            up = 0;
        while ( counter2 > 0 )
        {
            if (down2)  y2-=7;
            if (up2) y2+=7;
            counter2--;
        }
        if ( y2 > 0 && key[KEY_A])
            down2 = 1;
        else
            down2 = 0;
        if ( y2 < 375 && key[KEY_Z])
            up2 = 1;
        else
            up2 = 0;
 
        vsync();
        clear_to_color (screen, 0);
        draw_sprite ( screen, bar, x, y );
        draw_sprite ( screen, bar, x2, y2 );
        draw_sprite ( screen, logo, 245, 200 );
        draw_sprite ( screen, ball, ballx, bally );
       
  }


  destroy_bitmap(bar);
  destroy_bitmap(logo);
  allegro_exit();
  return 0;
}
END_OF_MAIN();

---

how do i make the ball move and... you know... do what the pong ball does?

thanks

That is not really a bitmap collision question :). Umm, Your code is hard to understand, this is how I would do a pong game:

Code:

---

while(!quit)
{
  getuserinput();    // Get the input, left, right, or up and down
  parseinput();      // Update the coordinates of the paddles
  updateball();      // Have this function update the coordinates of the ball
  drawscreen();
}

---

You could combine getuserinput and parseinput. Update ball should detect if the ball has hit a paddle, and have it change direction accordingly. I do not know about the calculations and stuff needed in pong, but it should handle all that. drawscreen should display the screen, the start the cycle over.

Just to let you know your bitmaps have to be likes this:

BITMAP *bar = load_bitmap( "sprite//bar.bmp", NULL );

instead of

BITMAP *bar = load_bitmap( "sprite/bar.bmp", NULL );


notice the extra / i have in there...well you have to have two in there.

I thought it was a backslash

load_bitmap("c:\\images\\bitmap.bmp");

Ok... lol... i get this a lot... but this is my <b>first</b> day of allegro... so don't expect me to know anything ;)

I'll try to make my code a little cleaner/better.

thanks

u might want to destroy all your bitmaps too eh