printing out vectors of type BITMAP

printing out vectors of type BITMAP

Money

Member #6,730

December 2005

hey, for animation im gonna store seperate sprite bitmaps into a vector, so then when a user presses a key, it prints out the first vector, or another key, it prints out another element in the vector..i don't really know how to implement this though. here is my code

1#include <allegro.h>
2 
3 
4int main() {
5    allegro_init();
6    install_keyboard();
7    set_color_conversion(COLORCONV_TOTAL); /* this is the new line */
8    set_color_depth(16);
9    set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0);
10 
11 
12 
13 
14 // Pass NULL to use default pallete
15    BITMAP *goku = load_bitmap("1.bmp", NULL);
16    BITMAP *gokus = load_bitmap("2.bmp", NULL);
17    vector<BITMAP> fighter;
18    fighter.push_back(goku);
19    fighter.push_back(gokus);
20    int index = 0;
21 
22    while( !key[KEY_ESC] )
23    {
24 
25    acquire_screen();
26    //print out the firstelement of the vector here, which is a static image of
27    //a sprite
28 
29 
30 
31 
32    release_screen();
33 
34    }
35 
36 
37 
38    return 0;
39}
40END_OF_MAIN()

do i do,

blit( //element from vector here, screen....

or what, i don't know how i would be printint out bitmaps from a vector to the screen

i love this stuff, it really has me thinking

[edit]

could

blit( fighter.front or begin // would that work?

Carrus85

Member #2,633

August 2002

Err, that shouldn't compile. You have a vector of BITMAP structs, but your pushing BITMAP*'s to the vector.

The proper method would be this:

// Pass NULL to use default pallete
  BITMAP *goku = load_bitmap("1.bmp", NULL);
  if ( !goku )
  {
       // Error out here
       return 0;
  }
  BITMAP *gokus = load_bitmap("2.bmp", NULL);
  if ( !gokus )
  {
       // Error out here
       return 0;
  }
  vector<BITMAP*> fighter;
  fighter.push_back(goku);
  fighter.push_back(gokus);
  // int index = 0; // I'd use iterators instead
18 
  vector<BITMAP*>::iterator iter = fighter.begin();
20 
21 
  bool keyIsPressed = false; // Use this to prevent "bouncing" of the images
  while( !key[KEY_ESC] )
  {
        if ( key[KEY_M] && !keyIsPressed ) // go up vector
        {
            if ( iter != fighter.end() - 1 ) // DON'T RUN PAST THE END OF THE VECTOR
                ++iter;
            keyIsPressed = true;
        }
        else if ( key[KEY_N] && !keyIsPressed ) // go down vector
        {
            if ( iter != fighter.start() )
                 --iter;
            keyIsPressed = true;
        }
        else
        {
            keyIsPressed = false;
        }
  acquire_screen();
        blit ( *iter, screen, 0, 0, 0, 0, (*iter)->w, (*iter)->h );
43 
  release_screen();
45 
  }
47 
  // ALWAYS clean up your memory when your done
  destroy_bitmap ( goku );
  destroy_bitmap ( gokus );
51 
  // Or this would work as well
  /*
  for ( iter = fighter.begin(); iter != fighter.end(); ++iter )
      destroy_bitmap ( *iter );
  */
57 
  return 0;

That should work. You'll need to add error checking to your liking in the two "NULL" checking loops

Money

Member #6,730

December 2005

ahh, ok

thanks carus85!

Evert

Member #794

November 2000

On a side and completely unrelated note, you should check the return values of allegro_init() and set_gfx_mode() (the latter being more important to check).