read a .we minetest schema

- use ground has maze walls

java/org/artisanlogiciel/games/minetest/Slice.java

@@ -0,0 +1,50 @@
+package org.artisanlogiciel.games.minetest;
+
+import java.util.HashMap;
+
+public class Slice
+    extends Range
+{
+
+    // x is index
+    HashMap<Integer, Raw> raws;
+
+    public Range getRawRange() {
+        return rawRange;
+    }
+
+    Range rawRange;
+
+    public Slice() {
+        super();
+        raws = new HashMap<>();
+        rawRange = new Range();
+    }
+
+    public void addNodeInRaw(Integer x, Node node) {
+        updateBounds(x.intValue());
+        Raw r = raws.get(x);
+        if ( r == null )
+        {
+            r = new Raw();
+            raws.put(x,r);
+        }
+        r.addNode(new Integer(node.getY()), node);
+        rawRange.union(r);
+    }
+
+    public Node getNode(int x, int y)
+    {
+        Raw r = raws.get(x);
+        if ( r == null )
+        {
+            return null;
+        }
+        return r.getNode(y);
+    }
+
+    public Raw getRaw(Integer x)
+    {
+        return raws.get(x);
+    }
+}