ToolPreview: a helper class for translating the effect of a tool

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@630 d9718cc8-9f43-0410-858b-315f434eb58c

src/micropolisj/engine/TranslatedToolEffect.java

@@ -0,0 +1,33 @@
+package micropolisj.engine;
+
+class TranslatedToolEffect implements ToolEffectIfc
+{
+	final ToolEffectIfc base;
+	final int dx;
+	final int dy;
+
+	TranslatedToolEffect(ToolEffectIfc base, int dx, int dy)
+	{
+		this.base = base;
+		this.dx = dx;
+		this.dy = dy;
+	}
+
+	//implements ToolEffectIfc
+	public int getTile(int x, int y)
+	{
+		return base.getTile(x+dx, y+dy);
+	}
+
+	//implements ToolEffectIfc
+	public void setTile(int x, int y, int tileValue)
+	{
+		base.setTile(x+dx, y+dy, tileValue);
+	}
+
+	//implements ToolEffectIfc
+	public void spend(int amount)
+	{
+		base.spend(amount);
+	}
+}