static inline void tur_rotate(turret_t *turret) {
fixed dx, dy;
int i;
int dir_n, dir_p;
int x, y;
int rotate_direction;
x = turret->x * 32;
y = turret->y * 32;
rotate_direction = 0;
/* rotate: get desired angle from target */
if (turret->target_monster != NULL) {
dx = itofix((x + 16) - (int)(turret->target_monster->x + 16));
dy = itofix((y + 16) - (int)(turret->target_monster->y + 16));
turret->desired_angle = fatan2(dy, dx) - itofix(64);
}
else
turret->desired_angle = itofix(-420);
if (turret->target_monster != NULL) {
if (fixtoi(turret->angle) != fixtoi(turret->desired_angle) && tur_target_within_range(turret,(int)turret->target_monster->x + 16,(int)turret->target_monster->y + 16)) {
dir_n = 0;
dir_p = 0;
/* calculate travel distances */
i = fixtoi(turret->angle);
for (;;) {
i--; dir_n++;
if (i < -192) i = 64;
if (i > 64) i = -192;
if (i == fixtoi(turret->desired_angle))
break;
}
i = fixtoi(turret->angle);
for (;;) {
i++; dir_p++;
if (dir_p > dir_n)
break;
if (i < -192) i = 64;
if (i > 64) i = -192;
if (i == fixtoi(turret->desired_angle))
break;
}
/* rotate */
if (dir_n < dir_p) rotate_direction = 1;
else rotate_direction = 2;
if (rotate_direction == 1) turret->angle = itofix(fixtoi(turret->angle) - 1);
if (rotate_direction == 2) turret->angle = itofix(fixtoi(turret->angle) + 1);
if (fixtoi(turret->angle) > 64) turret->angle = itofix(-192);
if (fixtoi(turret->angle) < -192) turret->angle = itofix(64);
}
} /* rotate */
}
int tur_target_within_sight(turret_t *turret, int target_x, int target_y)
{
int x, y;
int map_x, map_y;
turret_t *tp;
game_data_t *gd;
fixed angle, dx, dy;
float bx, by;
int i;
int px, py, pc;
dx = itofix((turret->x * 32 + 16) - target_x);
dy = itofix((turret->y * 32 + 16) - target_y);
angle = fatan2(dy, dx) - itofix(64);
x = turret->x * 32;
y = turret->y * 32;
bx = x + turret->bitmap->w/2;
by = y + turret->bitmap->h/2;
gd = get_game_data_pointer();
for (i = 0; i < turret->range / 15; i++) {
float result;
result = fixtof(fixcos(angle));
by -= result * 15;
result = fixtof(fixsin(angle));
bx += result * 15;
map_x = (int) bx / 32;
map_y = (int) by / 32;
if (map_x == target_x/32 && map_y == target_y/32)
return 1;
//putpixel(screen, bx, by, makecol(255,255,255));
tp = gd->turret;
for (;;) {
if (tp == NULL)
break;
if (tp != turret && (tp->x == map_x && tp->y == map_y)) {
/* found a turret in this tile, check for pixel value */
px = (int)bx - (map_x * 32);
py = (int)by - (map_y * 32);
pc = getpixel(tp->bitmap, px, py);
if (pc != makecol(255, 0, 255)) {
return 0;
}
}
tp = tp->next;
}
}
return 1;
}
void alienrocket::fireRocket(int dx, int dy, int a){
angle = rand()% 360;
targetX = itofix(dx);
targetY = itofix(dy);
fired = true;
int r1; //randomly picks an x coorinate in the general direction of the target
int r2; //randomly picks a y coordinate in the general direction of the target
r1 = (dx - 100) + int(200.0 * rand()/(RAND_MAX+1.0));
r2 = (dy - 100)+ int(200.0 * rand()/(RAND_MAX+1.0));
angle = a;
angle = fatan2(itofix(r2) - y, itofix(r1)- x);
}