2 files changed, 108 insertions, 2 deletions
diff --git a/core/src/ch/asynk/tankontank/engine/Tile.java b/core/src/ch/asynk/tankontank/engine/Tile.java
index 4e0589b..66dea74 100644
--- a/core/src/ch/asynk/tankontank/engine/Tile.java
+++ b/core/src/ch/asynk/tankontank/engine/Tile.java
@@ -10,11 +10,17 @@ public interface Tile extends BasicDrawable
 
     public void remove(Pawn pawn);
 
-    public Pawn getTop();
+    public Pawn getTopPawn();
 
-    public int costFrom(Side side);
+    public boolean mustBeDrawn();
 
+    public boolean occupied();
 
+    public boolean hasOverlayEnabled();
+
+    public void enableOverlay(int i, boolean enable);
+
+    public List<Tile> adjacents();
 
     public enum Side
     {
diff --git a/core/src/ch/asynk/tankontank/engine/TileOverlays.java b/core/src/ch/asynk/tankontank/engine/TileOverlays.java
new file mode 100644
index 0000000..57a95d4
--- /dev/null
+++ b/core/src/ch/asynk/tankontank/engine/TileOverlays.java
@@ -0,0 +1,100 @@
+package ch.asynk.tankontank.engine;
+
+import java.util.List;
+import java.util.ArrayDeque;
+
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.TextureAtlas;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+
+import ch.asynk.tankontank.engine.gfx.StackedSpriteNode;
+
+public abstract class TileOverlays implements Tile
+{
+    private StackedSpriteNode overlays;
+    private ArrayDeque<Pawn> stack;
+
+    public TileOverlays(TextureAtlas atlas)
+    {
+        this.stack = null;
+        this.overlays = new StackedSpriteNode(atlas);
+    }
+
+    @Override
+    public int push(Pawn pawn)
+    {
+        if (stack == null) stack = new ArrayDeque<Pawn>();
+        stack.push(pawn);
+        return stack.size();
+    }
+
+    @Override
+    public void remove(Pawn pawn)
+    {
+        stack.remove(pawn);
+    }
+
+    @Override
+    public Pawn getTopPawn()
+    {
+        if ((stack == null) || (stack.size() == 0)) return null;
+        return stack.getFirst();
+    }
+
+    @Override
+    public boolean mustBeDrawn()
+    {
+        if (occupied()) return true;
+        return hasOverlayEnabled();
+    }
+
+    @Override
+    public boolean occupied()
+    {
+        return (stack.size() != 0);
+    }
+
+    @Override
+    public boolean hasOverlayEnabled()
+    {
+        return overlays.isEnabled();
+    }
+
+    @Override
+    public void enableOverlay(int i, boolean enable)
+    {
+        overlays.enable(i, enable);
+    }
+
+    @Override
+    public List<Tile> adjacents()
+    {
+        // FIXME
+        System.err.println("adjacents() Not implemented yet");
+        return null;
+    }
+
+    @Override
+    public void setPosition(float x, float y, float z)
+    {
+        overlays.setPosition(x, y, z);
+    }
+
+    @Override
+    public void draw(Batch batch, float parentAlpha)
+    {
+        overlays.draw(batch, parentAlpha);
+        Pawn pawn = getTopPawn();
+        if (pawn != null)
+            pawn.draw(batch, parentAlpha);
+    }
+
+    @Override
+    public void drawDebug(ShapeRenderer debugShapes)
+    {
+        overlays.drawDebug(debugShapes);
+        Pawn pawn = getTopPawn();
+        if (pawn != null)
+            pawn.drawDebug(debugShapes);
+    }
+}