void
update_explosions(void)
{
struct explosion *p;
for (p = explosions; p != &explosions[MAX_EXPLOSIONS]; p++) {
if (p->used) {
if (++p->t >= p->ttl)
p->used = 0;
else
update_explosion(p);
}
}
}
int main(int argc, char const *argv[])
{
const int FPS = 60;
const int MAX_BULLETS = 10;
const int MAX_ASTEROIDS = 10;
const int MAX_EXPLOSIONS = 10;
srand(time(NULL));
int done = 0;
int redraw = 1;
if(!al_init())
{
al_show_native_message_box(NULL, "Error", "Error",
"Could not initialize Allegro 5.", 0, ALLEGRO_MESSAGEBOX_ERROR);
return -1;
}
ALLEGRO_DISPLAY *display = al_create_display(screen_width, screen_height);
if(!display)
{
al_show_native_message_box(NULL, "Error", "Error",
"Could not create display.", 0, ALLEGRO_MESSAGEBOX_ERROR);
return -1;
}
ALLEGRO_EVENT_QUEUE *event_queue = al_create_event_queue();
if(!event_queue)
{
al_show_native_message_box(display, "Error", "Error",
"Could not create event queue.", 0, ALLEGRO_MESSAGEBOX_ERROR);
return -1;
}
ALLEGRO_TIMER *timer = al_create_timer(1.0/FPS);
if(!timer)
{
al_show_native_message_box(display, "Error", "Error",
"Could not create timer.", 0, ALLEGRO_MESSAGEBOX_ERROR);
return -1;
}
if(!al_install_keyboard())
{
al_show_native_message_box(display, "Error", "Error",
"Could not install keyboard.", 0, ALLEGRO_MESSAGEBOX_ERROR);
return -1;
}
if(!al_install_mouse())
{
al_show_native_message_box(display, "Error", "Error",
"Could not install mouse.", 0, ALLEGRO_MESSAGEBOX_ERROR);
return -1;
}
if(!al_init_image_addon())
{
al_show_native_message_box(display, "Error", "Error",
"Could not initialize image addon.", 0, ALLEGRO_MESSAGEBOX_ERROR);
return -1;
}
if(!al_init_primitives_addon())
{
al_show_native_message_box(display, "Error", "Error",
"Could not initialize primitives addon.", 0, ALLEGRO_MESSAGEBOX_ERROR);
}
al_init_font_addon(); // for whatever reason this function is void returning
if(!al_init_ttf_addon())
{
al_show_native_message_box(display, "Error", "Error",
"Could not initialize ttf addon.", 0, ALLEGRO_MESSAGEBOX_ERROR);
}
al_hide_mouse_cursor(display);
al_register_event_source(event_queue, al_get_mouse_event_source());
al_register_event_source(event_queue, al_get_keyboard_event_source());
al_register_event_source(event_queue, al_get_display_event_source(display));
al_register_event_source(event_queue, al_get_timer_event_source(timer));
ALLEGRO_FONT *font18 = al_load_font("Arial.ttf", 18, 0);
int prev_x = screen_width, prev_y = screen_height;
int fps_counter = 0;
int fps_counter2 = 0;
int i, j, k;
struct spaceship ship;
init_ship(&ship);
struct bullet bullets[MAX_BULLETS];
for(i = 0; i < MAX_BULLETS; i++)
{
init_bullet(&bullets[i]);
}
struct asteroid asteroids[MAX_ASTEROIDS];
for(i = 0; i < MAX_ASTEROIDS; i++)
{
init_asteroid(&asteroids[i]);
}
struct explosion explosions[MAX_EXPLOSIONS];
for(i = 0; i < MAX_EXPLOSIONS; i++)
{
init_explosion(&explosions[i]);
}
al_start_timer(timer);
while(!done)
{
ALLEGRO_EVENT event;
al_wait_for_event(event_queue, &event);
if(event.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
{
done = 1;
}
if(event.type == ALLEGRO_EVENT_KEY_DOWN)
{
switch(event.keyboard.keycode)
{
case ALLEGRO_KEY_Q:
done = 1;
break;
case ALLEGRO_KEY_ESCAPE:
done = 1;
break;
}
}
if(event.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN)
{
if(event.mouse.button & 1)
{
for(i = 0; i < MAX_BULLETS; i++)
{
if(!bullets[i].live)
{
fire_bullet(&bullets[i], ship);
break;
}
}
}
}
if(event.type == ALLEGRO_EVENT_MOUSE_AXES ||
event.type == ALLEGRO_EVENT_MOUSE_ENTER_DISPLAY)
{
set_ship_coordinates(&ship, event.mouse.x, event.mouse.y);
}
if(event.type == ALLEGRO_EVENT_TIMER)
{
if(ship.x > prev_x)
{
ship.sprite.dir_horizontal = RIGHT;
}
else if(ship.x == prev_x)
{
ship.sprite.dir_horizontal = CENTER;
}
else if(ship.x < prev_x)
{
ship.sprite.dir_horizontal = LEFT;
}
if(ship.y > prev_y)
{
ship.sprite.dir_vertical = BACK;
}
else if(ship.y == prev_y)
{
ship.sprite.dir_vertical = NEUTRAL;
}
else if(ship.y < prev_y)
{
ship.sprite.dir_vertical = FORWARD;
}
if(++fps_counter >= FPS / 5)
{
fps_counter = 0;
prev_x = ship.x;
prev_y = ship.y;
}
if(++fps_counter2 >= 2 * FPS)
{
for(i = 0; i < MAX_ASTEROIDS; i++)
{
if(!asteroids[i].live)
{
start_asteroid(&asteroids[i]);
break;
}
}
fps_counter2 = 0;
}
for(i = 0; i < MAX_BULLETS; i++)
{
if(bullets[i].live)
{
update_bullet(&bullets[i]);
}
}
for(i = 0; i < MAX_ASTEROIDS; i++)
{
if(asteroids[i].live)
{
update_asteroid(&asteroids[i], &ship);
}
}
for(i = 0; i < MAX_EXPLOSIONS; i++)
{
if(explosions[i].live)
{
update_explosion(&explosions[i]);
}
}
update_ship_boundaries(&ship);
for(i = 0; i < MAX_BULLETS; i++)
{
if(bullets[i].live)
{
for(j = 0; j < MAX_ASTEROIDS; j++)
{
if(asteroids[j].live)
{
if(bullet_and_asteroid_collision(bullets[i], asteroids[j]))
{
bullets[i].live = 0;
asteroids[j].live = 0;
ship.score += 20;
for(k = 0; k < MAX_EXPLOSIONS; k++)
{
if(!explosions[k].live)
{
start_explosion(&explosions[k], bullets[i].x, bullets[i].y);
break;
}
}
}
}
}
}
}
for(i = 0; i < MAX_ASTEROIDS; i++)
{
if(asteroids[i].live)
{
if(ship_and_asteroid_collision(ship, asteroids[i]))
{
asteroids[i].live = 0;
for(k = 0; k < MAX_EXPLOSIONS; k++)
{
if(!explosions[k].live)
{
start_explosion(&explosions[k], ship.x, ship.y);
break;
}
}
ship.lives--;
}
}
}
if(!ship.lives)
{
done = true;
}
redraw = 1;
}
if(redraw)
{
redraw = 0;
draw_ship_sprite(ship.sprite, ship.x, ship.y);
for(i = 0; i < MAX_BULLETS; i++)
{
if(bullets[i].live)
{
draw_bullet(bullets[i]);
}
}
for(i = 0; i < MAX_ASTEROIDS; i++)
{
if(asteroids[i].live)
{
draw_asteroid(asteroids[i]);
}
}
for(i = 0; i < MAX_EXPLOSIONS; i++)
{
if(explosions[i].live)
{
draw_explosion(explosions[i]);
}
}
al_draw_textf(font18, al_map_rgb(255, 255, 255), 50, 5, 0,
"Score: %d ", ship.score); // I have no idea why it doesn't print the S...
al_draw_textf(font18, al_map_rgb(255, 255, 255), 50, 25, 0,
"Lives: %d", ship.lives);
al_flip_display();
al_clear_to_color(al_map_rgb(0, 0, 0));
}
}
for(i = 0; i < MAX_ASTEROIDS; i++)
{
destroy_asteroid(&asteroids[i]);
}
for(i = 0; i < MAX_EXPLOSIONS; i++)
{
destroy_explosion(&explosions[i]);
}
destroy_sprite(&ship.sprite);
al_destroy_display(display);
al_destroy_event_queue(event_queue);
al_destroy_timer(timer);
al_destroy_font(font18);
return 0;
}
// modify_scene modifies the global variables g_projectiles and g_explosions
// during the course of an attack sequence. It takes a parameter dt which
// represents the amount of time between frames.
// Return: the number of items left to animate.
int modify_scene(float dt)
{
int i, j, num_impacted;
float t;
struct Projectile *p;
struct Explosion *e;
struct Tank *tank;
Vector v;
float d;
// Go through all the explosions and update them according to the
// amount of time passed.
for(j = 0; j < g_num_explosions; j++)
{
e = &g_explosions[j];
t = update_explosion(e, dt);
}
// Go through all the projectiles and handle the ones that have not yet
// been impacted.
for(j = 0, num_impacted = 0; j < g_num_projectiles; j++)
{
p = &g_projectiles[j];
if(p->o.state != STATE_IMPACTED)
{
t = update_projectile(p, dt);
if(p->o.state == STATE_IMPACTED)
{
printf("Projectile %d has impacted.\n", j);
// If the projectile has impacted, an explosion needs to be
// created which is appropriate to the projectile which has
// impacted, and which takes on properties of the former
// projectile.
e = new_explosion(p);
// Now, using the remaining time that did not get used on the
// projectile, update the new explosion.
t = update_explosion(e, dt - t);
// And play a sound to match
sx3_play_sound(SX3_AUDIO_EXPLOSION);
}
}
if(p->o.state == STATE_IMPACTED) num_impacted++;
}
// FIX ME!! These two checks don't work properly if we have a low
// framerate.
for(j = 0; j < g_num_explosions; j++)
{
e = &g_explosions[j];
for(i = 0; i < g_num_tanks; i++)
{
tank = &g_tanks[i];
// Don't check this tank if it's already been hit
// FIX ME!! This should be on a per-projectile/explosion basis
if(tank->s.temp_damage != 0.0) continue;
// Find the distance between the tank and the explosion, and test
vv_cpy(v, tank->o.props.position);
vv_sub(v, e->props.position);
d = v_mag(v);
if(d < tank->o.props.radius + e->props.radius)
{
// A tank has been hit!
sx3_play_sound(SX3_AUDIO_HIT);
printf("Tank %d hit by explosion %d\n", i, j);
// FIX ME!! This should not be constant damage.
tank->s.temp_damage = 20.0;
}
}
}
for(j = 0; j < g_num_projectiles; j++)
{
p = &g_projectiles[j];
if(p->o.state == STATE_IMPACTED) continue;
for(i = 0; i < g_num_tanks; i++)
{
tank = &g_tanks[i];
// Don't check this tank if it's already been hit
// FIX ME!! This should be on a per-projectile/explosion basis
if(tank->s.temp_damage != 0.0) continue;
// Find the distance between the tank and the projectiles, and test
vv_cpy(v, tank->o.props.position);
vv_sub(v, p->o.props.position);
d = v_mag(v);
if(d < tank->o.props.radius + p->o.props.radius)
{
// A tank has been hit!
sx3_play_sound(SX3_AUDIO_HIT);
printf("Tank %d hit by projectile %d\n", i, j);
// FIX ME!! This should not be constant damage.
tank->s.temp_damage = 40.0;
}
}
}
return g_num_explosions + g_num_projectiles - num_impacted;
}