I use this for my pacman game to load in my main character. He is on a sprite sheet which is basically just a group of images, all 50x50 each, 4 wide x 5 high.
pacman.sheet = al_load_bitmap("Graphics/Pacman.png");
if(!pacman.sheet) {
a5_error(AT, display.screen, "Failed to load Pacman bitmaps.");
shut_down();
exit(1);
}
for(int y = 0; y < 5; y++) { // bitmaps are 5 rows
for(int x = 0; x < 4; x++) { // by 4 columns
pacman.bitmap[4*y+x] = al_create_sub_bitmap(pacman.sheet, x*SPRITE_SIZE, y*SPRITE_SIZE,
SPRITE_SIZE, SPRITE_SIZE);
}
}
I have a function called shut_down(); that will destroy any bitmaps that were created. I don't like just exiting my program on error without first calling that to properly destroy anything that may have been created before the error.
Anyhow, this way you load in the graphics all at once, then you can procede to create subbitmaps of each image you want if they're all related (and small enough to fit on a single sheet).
Arthur: how will <code>image[num] = al_load_bitmap("images/image-"".jpg");</code> know what image number to load?!
I see you corrected that. 
I have always done it like: (C code, I actually use C99 myself)
#SelectExpand
1#include<stdio.h>
2
3int i
;
4char filename
[80];
5ALLEGRO_BITMAP *image
[287];
6
7/* you have 287 images, so <287, not <=287, it will be 0 to 286
8 unless you have 288 images, 0 to 287? */
9for(i
=0; i
<287; i
++) {
10 sprintf(filename,
"images/image-%d.jpg", i
);
11 image
[i
] = NULL
;
12 image
[i
] = al_load_bitmap(filename
);
13 if(image
[i
] == NULL
) {
14 printf("Error loading /"%s
/"", filename
);
15 shutdown
(); /* destroy any bitmaps that were created first */
16 exit(1);
17 }
18}
Also, when I save images like that, I like to name them with 3 numbers, like IMAGE000.JPG, IMAGE001.JPG ... IMAGE287.JPG, they will list in your directory in order this way... in which case you want to use something like:
sprintf(filename, "images/image%03d.jpg", i);
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