/**
* Return a new enemy element
* @param power Power of destruction of this new enemy
* @param energy Energy level of this new enemey
* @param current_image Current image index
* @param type Identifier of this enemy
* @param shot_delay Delay value before two shots
* @return Pointer to the new enemy element
*/
static enemy *
lonely_foe_new (Sint16 power, Sint16 energy, Sint16 current_image,
Sint32 type, Sint32 shot_delay)
{
Sint32 i;
enemy *foe;
foe = enemy_get ();
if (foe == NULL)
{
return NULL;
}
foe->spr.pow_of_dest = power;
foe->spr.energy_level = energy;
foe->spr.numof_images = 32;
foe->spr.current_image = current_image;
foe->spr.anim_count = 0;
for (i = 0; i < foe->spr.numof_images; i++)
{
foe->spr.img[i] = (image *) & enemi[type][i];
}
foe->fire_rate = shot_delay;
foe->fire_rate_count = foe->fire_rate;
foe->displacement = DISPLACEMENT_LONELY_FOE;
foe->type = type;
foe->dead = FALSE;
foe->visible = TRUE;
return foe;
}
/**
* Initialize grid phase
*/
void
grid_start (void)
{
Sint32 i, j, k;
enemy *foe;
spaceship_struct *ship = spaceship_get ();
for (i = 0; i < GRID_WIDTH; i++)
{
for (j = 0; j < GRID_HEIGHT; j++)
{
/* enemy exists? */
if (grid.enemy_num[i][j] != -1)
{
/* get a new enemy element */
foe = enemy_get ();
if (foe == NULL)
{
continue;
}
/* little enemy or big enemy (Bloodsuckers, chief of the wave)? */
if (grid.enemy_num[i][j] < ENEMIES_MAX_SMALL_TYPES)
{
/* set power of the destruction */
foe->spr.pow_of_dest = (Sint16) (1 + grid.enemy_num[i][j]);
/* the level of energy of the sprite */
foe->spr.energy_level =
(Sint16) ((ship->type << 1) + foe->spr.pow_of_dest);
/* size of the enemy sprite as 16x16 pixels */
foe->type = 0;
}
else
/*
* Bloodsuckers, the chief of the wave
*/
{
/* set power of the destruction */
foe->spr.pow_of_dest =
(Sint16) (6 +
(grid.enemy_num[i][j] -
ENEMIES_MAX_SMALL_TYPES) * 2);
/* the level of energy of the sprite */
foe->spr.energy_level =
(Sint16) ((ship->type << 2) + foe->spr.pow_of_dest + 10);
/* size of the enemy sprite as 32x32 pixels */
foe->type = 1;
}
/* set number of images of the sprite */
foe->spr.numof_images = 8;
/* set current image of the enemy sprite */
foe->spr.current_image = (Sint16) (rand () % 8);
/* delay before next image: speed of the animation */
foe->spr.anim_speed = 10;
/* counter delay before next image */
foe->spr.anim_count = 0;
/* set addresses of the images buffer */
for (k = 0; k < foe->spr.numof_images; k++)
{
if (grid.enemy_num[i][j] < ENEMIES_MAX_SMALL_TYPES)
/* enemy sprite of 16x16 pixels */
foe->spr.img[k] =
(image *) & enemi[grid.enemy_num[i][j]][32 + k];
else
/* enemy sprite of 32x32 pixels */
foe->spr.img[k] =
(image *) & enemi[grid.enemy_num[i][j]][k];
}
/* delay value before next shot */
foe->fire_rate_count = grid.shoot_speed[i][j];
/* type of displacement */
foe->displacement = DISPLACEMENT_GRID;
foe->pos_vaiss[XCOORD] = (Sint16) i;
foe->pos_vaiss[YCOORD] = (Sint16) j;
}
}
}
/* set grid x coordinate */
grid.coor_x = 128;
/* set grid y coordinate */
grid.coor_y = -176;
/* enable the appearance of the grid of enemies */
grid.is_appearing = TRUE;
/* grid phase disable */
grid.is_enable = FALSE;
/* set movement toward right or left */
grid.right_movement = rand () % 2 ? TRUE : FALSE;
if (grid.right_movement)
{
grid.speed_x = grid.vit_dep_x;
}
else
{
grid.speed_x = -grid.vit_dep_x;
}
}
