tools: limit tools for most buildings to a single building at a time

buildings like power plants, stadiums, etc. must be placed one at a time
now

src/micropolisj/engine/BuildingTool.java

@@ -0,0 +1,60 @@
+// This file is part of MicropolisJ.
+// Copyright (C) 2013 Jason Long
+// Portions Copyright (C) 1989-2007 Electronic Arts Inc.
+//
+// MicropolisJ is free software; you can redistribute it and/or modify
+// it under the terms of the GNU GPLv3, with additional terms.
+// See the README file, included in this distribution, for details.
+
+package micropolisj.engine;
+
+import static micropolisj.engine.TileConstants.*;
+
+class BuildingTool extends ToolStroke
+{
+	public BuildingTool(Micropolis engine, MicropolisTool tool, int xpos, int ypos)
+	{
+		super(engine, tool, xpos, ypos);
+	}
+
+	@Override
+	public void dragTo(int xdest, int ydest)
+	{
+		this.xpos = xdest;
+		this.ypos = ydest;
+		this.xdest = xdest;
+		this.ydest = ydest;
+	}
+
+	@Override
+	boolean apply1(ToolEffectIfc eff)
+	{
+		switch (tool)
+		{
+		case FIRE:
+			return applyZone(eff, FIRESTATION);
+
+		case POLICE:
+			return applyZone(eff, POLICESTATION);
+
+		case POWERPLANT:
+			return applyZone(eff, POWERPLANT);
+
+		case STADIUM:
+			return applyZone(eff, STADIUM);
+
+		case SEAPORT:
+			return applyZone(eff, PORT);
+
+		case NUCLEAR:
+			return applyZone(eff, NUCLEAR);
+
+		case AIRPORT:
+			return applyZone(eff, AIRPORT);
+
+		default:
+			// not expected
+			throw new Error("unexpected tool: "+tool);
+		}
+	}
+}

src/micropolisj/engine/MicropolisTool.java

@@ -54,15 +54,25 @@ public enum MicropolisTool
 
 	public ToolStroke beginStroke(Micropolis engine, int xpos, int ypos)
 	{
-		if (this == BULLDOZER) {
+		switch (this) {
+		case BULLDOZER:
 			return new Bulldozer(engine, xpos, ypos);
-		}
-		else if (this == WIRE ||
-			this == ROADS ||
-			this == RAIL) {
+
+		case WIRE:
+		case ROADS:
+		case RAIL:
 			return new RoadLikeTool(engine, this, xpos, ypos);
-		}
-		else {
+
+		case FIRE:
+		case POLICE:
+		case STADIUM:
+		case SEAPORT:
+		case POWERPLANT:
+		case NUCLEAR:
+		case AIRPORT:
+			return new BuildingTool(engine, this, xpos, ypos);
+
+		default:
 			return new ToolStroke(engine, this, xpos, ypos);
 		}
 	}

src/micropolisj/engine/ToolStroke.java

@@ -77,27 +77,6 @@ public class ToolStroke
 		case INDUSTRIAL:
 			return applyZone(eff, INDCLR);
 
-		case FIRE:
-			return applyZone(eff, FIRESTATION);
-
-		case POLICE:
-			return applyZone(eff, POLICESTATION);
-
-		case POWERPLANT:
-			return applyZone(eff, POWERPLANT);
-
-		case STADIUM:
-			return applyZone(eff, STADIUM);
-
-		case SEAPORT:
-			return applyZone(eff, PORT);
-
-		case NUCLEAR:
-			return applyZone(eff, NUCLEAR);
-
-		case AIRPORT:
-			return applyZone(eff, AIRPORT);
-
 		default:
 			// not expected
 			throw new Error("unexpected tool: "+tool);