destroy missiles and disnakes on fountain

rogueviz/ru/classes.cpp

@@ -319,6 +319,8 @@ struct entity {
   virtual string get_help() { return "No help about this."; }
 
   virtual bool hit_by_missile(missile *m) { return false; }
+
+  virtual void on_fountain();
   };
 
 struct statdata {
@@ -614,6 +616,7 @@ struct disnake : public snake {
   int max_hp() override { return 1; }
   void unact() override { destroyed = true; }
   int bite() override { return 5; }
+  void on_fountain() override { destroyed = true; }
   };
 
 struct kestrel : public enemy {
@@ -776,6 +779,7 @@ struct missile : public entity {
   void hit_wall() override { destroyed = true; }
   struct missile* as_missile() override { return this; }
   virtual void hs(stater& s) override { entity::hs(s); s.act("power", power, 0); }
+  void on_fountain() override { destroyed = true; }
   };
 
 struct ice_missile : public missile {

rogueviz/ru/entity.cpp

@@ -17,6 +17,8 @@ bbox entity::get_pixel_bbox_at(xy p, ld scalex, ld scaley) {
   return b;
   }
 
+void entity::on_fountain() { hs(fountain_resetter); }
+
 bool entity::visible(room *r) {
   auto bb = get_intersect(pixel_to_block(get_pixel_bbox()), room_bb);
   for(int y = bb.miny; y < bb.maxy; y++) for(int x = bb.minx; x < bb.maxx; x++) if(r->fov[y][x]) return true;

rogueviz/ru/man.cpp

@@ -12,7 +12,7 @@ xy stable_where;
 void regenerate_all() {
   m.hs(fountain_resetter);
   for(auto& p: powers) p.refill();
-  for(auto& r: rooms) for(auto& e: r.second.entities) e->hs(fountain_resetter);
+  for(auto& r: rooms) for(auto& e: r.second.entities) e->on_fountain();
   revert_all(fountain_revert);
   current_target = nullptr;
   shuffle_all();