Something I forgot to mention:
Notice in the code that the Allegro timer isn't even used. In this case, I'm synchronizing my timer to the screen refresh rate, using vsync(). You could, however, synchronize the code to the Allegro timer, or any other timer mechanism.
To use the allegro timer, create a timer handler that simply increments a global variable. Don't fall into the trap of thinking you can make the Timer object global and call its tick() method directly. This could make your program/system crash.
Use a global variable that's updated within the timer handler, in conjunction with a loop inside main() (or wherever) that constantly checks the global variable and calls the tick method if needed. Here's a brief, untested skeleton code block:
code:
#include <allegro.h>
// The global timer variable
int global_ticks
// The timer handler
void my_timer() {
global_ticks++;
}
// ...
int main() {
allegro_init();
install_timer();
Timer *t = new Timer();
// Create your TimeListener objects
// ...
global_ticks = 0;
install_int(my_timer, 10);
// Other stuff you might do here
// ...

// Main game loop
while(player->alive) {
while (global_ticks) {
t->tick();
global_ticks--;
}
// This is where you render the scene in the back buffer
// ...
vsync();
// This is where you blit the back buffer to the screen.
}
}
END_OF_MAIN()

[ January 18, 2002: Message edited by: Steve++ ]

The keyframe example on my website might be of use. It's similar to Amarillion's way.