diff --git a/include/doorkeeper/components/layer.hpp b/include/doorkeeper/components/layer.hpp
index 42f0e90..7ebce9e 100644
--- a/include/doorkeeper/components/layer.hpp
+++ b/include/doorkeeper/components/layer.hpp
@@ -44,7 +44,8 @@ namespace dk {
 		virtual ~LayerBase ( void ) noexcept = default;
 
 		void preload ( const coords& parFrom, const coords& parTo );
-		const coords& mapSize ( void ) const { return m_count; }
+		const coords& map_size ( void ) const { return m_count; }
+		const coords& tile_size ( void ) const { return m_tilesize; }
 
 	protected:
 		coords m_count;
@@ -68,7 +69,7 @@ namespace dk {
 
 		Layer ( const Layer& ) = delete;
 		Layer ( Layer&& ) = default;
-		Layer ( const coords& parTileSize, BaseMapSource<D>* parTilemap );
+		explicit Layer ( BaseMapSource<D>* parTilemap );
 		virtual ~Layer ( void ) noexcept = default;
 
 		Layer& operator= ( const Layer& ) = delete;
diff --git a/include/doorkeeper/components/layeredviewport.hpp b/include/doorkeeper/components/layeredviewport.hpp
new file mode 100644
index 0000000..5ee092c
--- /dev/null
+++ b/include/doorkeeper/components/layeredviewport.hpp
@@ -0,0 +1,49 @@
+/* Copyright 2015, Michele Santullo
+ * This file is part of DoorKeeper.
+ *
+ * DoorKeeper is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DoorKeeper is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with DoorKeeper.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef id83407244096746CDBFF64D23F0B1701A
+#define id83407244096746CDBFF64D23F0B1701A
+
+#include "doorkeeper/primitivetypes.hpp"
+#include "doorkeeper/components/viewport.hpp"
+#include "doorkeeper/components/tyler.hpp"
+#include "doorkeeper/components/layer.hpp"
+
+namespace dk {
+	template <uint32_t D>
+	class LayeredViewport {
+	public:
+		typedef VectorT<CoordinateAccumType, D> coords_f;
+
+		explicit LayeredViewport ( Tyler<D>& parTyler );
+		~LayeredViewport ( void ) noexcept;
+
+		LayeredViewport<D>& operator+= ( const coords_f& parValue );
+		LayeredViewport<D>& operator-= ( const coords_f& parValue );
+
+		void on_layer_added ( const LayerBase<D>* parLayer );
+		void on_layer_removed ( const LayerBase<D>* parLayer );
+
+	private:
+		typedef std::vector<Viewport<D>> ViewportList;
+		Tyler<D>& m_tyler;
+	};
+} //namespace dk
+
+#include "doorkeeper/implem/layeredviewport.inl"
+
+#endif
diff --git a/include/doorkeeper/components/tyler.hpp b/include/doorkeeper/components/tyler.hpp
index aa288e4..63d98d5 100644
--- a/include/doorkeeper/components/tyler.hpp
+++ b/include/doorkeeper/components/tyler.hpp
@@ -36,15 +36,10 @@ namespace dk {
 	public:
 		typedef typename LayerBase<D>::coords coords;
 
-		Tyler ( void ) = delete;
+		Tyler ( void );
 		Tyler ( Tyler&& ) = default;
-		Tyler ( const coords& parMapSize, const coords& parTileSize );
 		~Tyler ( void ) noexcept = default;
 
-		typename coords::scalar_type tiles_count ( void ) const;
-		const coords& map_size ( void ) const { return m_size; }
-		const coords& tile_size ( void ) const { return m_tilesize; }
-
 		template <typename T>
 		Layer<T, D>& push_layer ( BaseMapSource<D>* parTilemap, int parIndex );
 		template <typename T>
@@ -53,8 +48,6 @@ namespace dk {
 		void preload ( const coords& parFrom, const coords& parTo );
 
 	private:
-		coords m_size;
-		const coords m_tilesize;
 		LayerList m_layers;
 	};
 } //namespace dk
diff --git a/include/doorkeeper/implem/layer.inl b/include/doorkeeper/implem/layer.inl
index b68a8ef..b2620cc 100644
--- a/include/doorkeeper/implem/layer.inl
+++ b/include/doorkeeper/implem/layer.inl
@@ -60,8 +60,8 @@ namespace dk {
 	///--------------------------------------------------------------------------
 	///--------------------------------------------------------------------------
 	template <typename T, uint32_t D>
-	Layer<T, D>::Layer (const coords& parTileSize, BaseMapSource<D>* parTilemap) :
-		LayerBase<D>(parTilemap->mapSize(), parTileSize),
+	Layer<T, D>::Layer (BaseMapSource<D>* parTilemap) :
+		LayerBase<D>(parTilemap->mapSize(), parTilemap->tileSize()),
 		m_tilemap(parTilemap)
 	{
 		DK_ASSERT(m_tilemap);
diff --git a/include/doorkeeper/implem/layeredviewport.inl b/include/doorkeeper/implem/layeredviewport.inl
new file mode 100644
index 0000000..5c7f110
--- /dev/null
+++ b/include/doorkeeper/implem/layeredviewport.inl
@@ -0,0 +1,46 @@
+/* Copyright 2015, Michele Santullo
+ * This file is part of DoorKeeper.
+ *
+ * DoorKeeper is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DoorKeeper is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with DoorKeeper.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace dk {
+	template <uint32_t D>
+	LayeredViewport<D>::LayeredViewport (Tyler<D>& parTyler) :
+		m_tyler(parTyler)
+	{
+	}
+
+	template <uint32_t D>
+	LayeredViewport<D>::~LayeredViewport() {
+	}
+
+	template <uint32_t D>
+	LayeredViewport<D>& LayeredViewport<D>::operator+= (const coords_f& parValue) {
+		return *this;
+	}
+
+	template <uint32_t D>
+	LayeredViewport<D>& LayeredViewport<D>::operator-= (const coords_f& parValue) {
+		return *this;
+	}
+
+	template <uint32_t D>
+	void LayeredViewport<D>::on_layer_added (const LayerBase<D>* parLayer) {
+	}
+
+	template <uint32_t D>
+	void LayeredViewport<D>::on_layer_removed (const LayerBase<D>* parLayer) {
+	}
+} //namespace dk
diff --git a/include/doorkeeper/implem/maploader.inl b/include/doorkeeper/implem/maploader.inl
index 4f97baa..bef5ba6 100644
--- a/include/doorkeeper/implem/maploader.inl
+++ b/include/doorkeeper/implem/maploader.inl
@@ -19,7 +19,7 @@ namespace dkh {
 	template <uint32_t D, typename C>
 	dk::Tyler<D> map_load (C& parFileOpener, const std::string& parOpen, const PushLayerMapType<D>& parPusher) {
 		dk::BaseMapSource<D>* reader = parFileOpener(parOpen);
-		dk::Tyler<D> tyler(reader->mapSize(), reader->tileSize());
+		dk::Tyler<D> tyler;
 		for (int z = 0; z < reader->layersCount(); ++z) {
 			implem::call_push_layer<D>(tyler, parPusher, reader, z);
 		}
diff --git a/include/doorkeeper/implem/tyler.inl b/include/doorkeeper/implem/tyler.inl
index 83c3b13..e67ef62 100644
--- a/include/doorkeeper/implem/tyler.inl
+++ b/include/doorkeeper/implem/tyler.inl
@@ -19,21 +19,7 @@ namespace dk {
 	///--------------------------------------------------------------------------
 	///--------------------------------------------------------------------------
 	template <uint32_t D>
-	Tyler<D>::Tyler (const coords& parMapSize, const coords& parTileSize) :
-		m_size(parMapSize),
-		m_tilesize(parTileSize)
-	{
-	}
-
-	///--------------------------------------------------------------------------
-	///--------------------------------------------------------------------------
-	template <uint32_t D>
-	typename Tyler<D>::coords::scalar_type Tyler<D>::tiles_count() const {
-		typename coords::scalar_type retval = 1;
-		for (uint32_t d = 0; d < D; ++d) {
-			retval *= m_size[d];
-		}
-		return retval;
+	Tyler<D>::Tyler() {
 	}
 
 	///--------------------------------------------------------------------------
@@ -44,17 +30,7 @@ namespace dk {
 		//TODO: store the index
 		(void)parIndex;
 
-		auto newLayer = new Layer<T, D>(m_tilesize, parTilemap);
-		if (m_size == coords(0)) {
-			m_size = newLayer->mapSize();
-		}
-		else {
-			DK_ASSERT(newLayer->mapSize() == m_size);
-			if (newLayer->mapSize() != m_size) {
-				throw SizeMismatchException();
-			}
-		}
-		DK_ASSERT(newLayer->mapSize() == m_size);
+		auto newLayer = new Layer<T, D>(parTilemap);
 		m_layers.push_back(LayerPtr(newLayer));
 		return *newLayer;
 	}
diff --git a/test/main.cpp b/test/main.cpp
index 122b8e0..2bf09bd 100644
--- a/test/main.cpp
+++ b/test/main.cpp
@@ -87,7 +87,7 @@ int main() {
 		&SDL_DestroyRenderer
 	);
 
-	dk::Tyler<2> tiler(coords2(10, 23), coords2(64));
+	dk::Tyler<2> tiler;
 
 	LayerWithData<AsciiMapSource, int> bottomLayer;
 	addLayer(tiler, bottomLayer, DATA_PATH"/test.map");
@@ -99,9 +99,8 @@ int main() {
 	printViewport(dk::Viewport<2>(tiler, coords2(4, 4), coords2(0)), *bottomLayer.layer);
 
 #if !defined(NDEBUG)
-	std::cout << "Map size: " << tiler.map_size() << '\n';
+	std::cout << "Map size: " << bottomLayer.layer->map_size() << '\n';
 #endif
-	std::cout << "Total tiles: " << tiler.tiles_count() << '\n';
 
 	//Load resources
 	SDLTextureUPtr tile_0(nullptr, &SDL_DestroyTexture), tile_1(nullptr, &SDL_DestroyTexture);
@@ -113,7 +112,7 @@ int main() {
 	//Main loop
 	bool running = true;
 	int y = 0;
-	dk::Viewport<2> viewport(tiler, tiler.map_size(), coords2(0));
+	dk::Viewport<2> viewport(tiler, bottomLayer.layer->map_size(), coords2(0));
 	coords2 tile_size;
 	SDL_QueryTexture(tile_0.get(), nullptr, nullptr, &tile_size.x(), &tile_size.y());
 	do {
@@ -121,7 +120,7 @@ int main() {
 		viewport.setFrom(coords2(0, y / tile_size.y()));
 		draw_tiles(sdl_renderer.get(), tile_0.get(), tile_1.get(), viewport, *bottomLayer.layer, -(y % tile_size.y()));
 		//++y;
-		if (tile_size.y() * bottomLayer.layer->mapSize().y() == y)
+		if (tile_size.y() * bottomLayer.layer->map_size().y() == y)
 			y = 0;
 		SDL_RenderPresent(sdl_renderer.get());