/**
* Collision between shockwave and an enemy
* @param enemy_num enemy element index
* @return TRUE if collision occurs, otherwise FALSE
*/
bool
shockwave_collision (enemy * foe)
{
shockwave_struct *shock;
Sint32 i, centerx, centery, dist;
Sint32 dx, dy, resultat;
shock = shockwave_first;
if (shock == NULL)
{
return FALSE;
}
if (num_of_shockwaves == 0)
{
return FALSE;
}
centerx =
(Sint32) (foe->spr.xcoord + foe->spr.img[foe->spr.current_image]->x_gc);
centery =
(Sint32) (foe->spr.ycoord + foe->spr.img[foe->spr.current_image]->y_gc);
/* process each shockwave */
for (i = 0; i < num_of_shockwaves; i++, shock = shock->next)
{
if (shock == NULL && i < (num_of_shockwaves - 1))
{
LOG_ERR ("shock->next is null %i/%i", i, num_of_shockwaves);
break;
}
/* calculate the distance between shockwave center and enemy center */
dx = centerx - shock->center_x;
dy = centery - shock->center_y;
resultat = (dx * dx) + (dy * dy);
dist = (Sint32) sqrt (resultat);
/* collision detected? */
if (dist >= (27 + (shock->ring_index * 5))
&& dist <= (43 + (shock->ring_index * 5)))
{
/* add a bonus gem or a lonely foe */
bonus_add (foe);
/* collision between the enemy an a shockwave */
return TRUE;
}
}
/* no collision between the enemy an a shockwave */
return FALSE;
}
/**
* Collisions between satellite protections and an enemy
* @param foe pointer to the structure of an enemy
* @param num_of_fragments number of fragments to add if enemy is destroyed
* @return TRUE if enemy is destroyed
*/
bool
satellites_enemy_collisions (enemy * foe, Sint32 num_of_fragments)
{
Sint32 i, l, m, x1, y1, x2, y2;
satellite_struct *sat;
sat = satellite_first;
if (sat == NULL)
{
return FALSE;
}
/* process each protection satellite */
for (i = 0; i < num_of_satellites; i++, sat = sat->next)
{
#ifdef UNDER_DEVELOPMENT
if (sat == NULL && i < (num_of_satellites - 1))
{
LOG_ERR ("sat->next is null %i/%i", i, num_of_satellites);
break;
}
#endif
/* if satellite is invisible, don't perform the tests of collision */
if (!sat->is_visible)
{
continue;
}
/* for each collision point of the satellite */
for (l = 0; l < sat->img[sat->current_image]->numof_collisions_points;
l++)
{
/* coordinates of the collision point of the satellite */
x1 =
sat->xcoord +
sat->img[sat->current_image]->collisions_points[l][XCOORD];
y1 =
sat->ycoord +
sat->img[sat->current_image]->collisions_points[l][YCOORD];
/* for each collision zone of the enemy */
for (m = 0;
m <
foe->spr.img[foe->spr.current_image]->numof_collisions_zones;
m++)
{
/* coordinates of the collision zone of the enemy */
x2 =
(Sint32) foe->spr.xcoord +
foe->spr.img[foe->spr.
current_image]->collisions_coords[m][XCOORD];
y2 =
(Sint32) foe->spr.ycoord +
foe->spr.img[foe->spr.
current_image]->collisions_coords[m][YCOORD];
/* check if satellite collision point is into enemy collision zone */
if (x1 >= x2 &&
y1 >= y2 &&
x1 <
(x2 +
foe->spr.img[foe->spr.
current_image]->collisions_sizes[m]
[IMAGE_WIDTH])
&& y1 <
(y2 +
foe->spr.img[foe->spr.current_image]->
collisions_sizes[m][IMAGE_HEIGHT]))
{
/* decrease energy level of enemy */
foe->spr.energy_level =
(Sint16) (foe->spr.energy_level - sat->pow_of_dest);
if (foe->type >= THANIKEE)
{
energy_gauge_guard_is_update = TRUE;
}
/* decrease energy level of satellite */
sat->energy_level =
(Sint16) (sat->energy_level - foe->spr.pow_of_dest);
/* check if satellite is destroyed */
if (sat->energy_level <= 0)
{
/* remove satellite from the list */
satellite_del (sat);
/* positioning the satellites around the spaceship */
satellites_setup ();
goto next_satellite;
}
else
{
/* satellite not destroyed, display white mask */
sat->is_mask = TRUE;
}
/* check if enemy is destroyed */
if (foe->spr.energy_level <= 0)
{
/* check if the enemy is a meteor */
if ((foe->type >= BIGMETEOR && foe->type <= SMALLMETEOR)
|| foe->type >= THANIKEE)
{
/* add a bonus gem or a lonely foe */
bonus_meteor_add (foe);
if (num_of_fragments > 0)
{
explosions_fragments_add (foe->spr.xcoord +
foe->spr.img[foe->
spr.current_image]->
x_gc - 8,
foe->spr.ycoord +
foe->spr.img[foe->
spr.current_image]->
y_gc - 8, 1.0,
num_of_fragments, 0,
2);
}
}
else
{
/* add a bonus gem or a lonely foe */
bonus_add (foe);
}
player_score +=
foe->spr.pow_of_dest << 2 << score_multiplier;
return TRUE;
}
else
{
/* enemy not destroyed, display white mask */
foe->is_white_mask_displayed = TRUE;
}
explosion_add ((float) x1, (float) y1, 0.3f,
EXPLOSION_SMALL, 0);
goto next_satellite;
}
}
}
next_satellite:;
}
return FALSE;
}
