Function DrawElectricalWeapon

Descent3/WeaponFire.cpp:2026–2219

Draws a lighting like chain of electricity

// Draws a lighting like chain of electricity
void DrawElectricalWeapon(object *obj) {
  int i, t;
  vector center_vecs[20];
  vector arc_vec;
  g3Point arc_points[100];
  vector dest_vector, src_vector, line_norm;
  float line_mag;
  g3Point *pntlist[20];
  vector dir;
  object *parent_obj = ObjGet(obj->parent_handle);
  float view_dp = 0;

  if (!parent_obj)
    return;

  if (parent_obj->type == OBJ_PLAYER) {
    if (Players[parent_obj->id].flags & (PLAYER_FLAGS_DYING | PLAYER_FLAGS_DEAD))
      return;
  } else {
    if (parent_obj->flags & OF_DYING)
      return;
  }

  int bm_handle = GetWeaponFireImage(obj->id, 0);
  ASSERT(bm_handle >= 0);

  WeaponCalcGun(&src_vector, &dir, parent_obj, obj->ctype.laser_info.src_gun_num);

  if (obj->ctype.laser_info.track_handle == OBJECT_HANDLE_NONE || ObjGet(obj->ctype.laser_info.track_handle) == NULL) {
    dest_vector = src_vector + (obj->orient.fvec * 50);
  } else {
    object *obj_to_track = ObjGet(obj->ctype.laser_info.track_handle);
    dest_vector = obj_to_track->pos;
    if (obj_to_track == Player_object) {
      vector subvec = src_vector - dest_vector;
      float mag = vm_GetMagnitudeFast(&subvec);

      if (mag < .5) {
        obj->lifeleft = 0;
        return;
      }

      subvec /= mag;

      dest_vector += subvec; // This prevents rendering errors
    }
  }

  // Find out if it is o.k. to create a weapon here.
  fvi_query fq;
  fvi_info hit_data;
  int fate;

  fq.p0 = &src_vector;
  fq.startroom = obj->roomnum;
  fq.p1 = &dest_vector;
  fq.rad = 0;
  fq.thisobjnum = -1;