ToolEffect: stores effect of tool and then applies it as transaction

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@631 d9718cc8-9f43-0410-858b-315f434eb58c

src/micropolisj/engine/ToolEffect.java

@@ -0,0 +1,76 @@
+package micropolisj.engine;
+
+import static micropolisj.engine.TileConstants.CLEAR;
+
+class ToolEffect implements ToolEffectIfc
+{
+	final Micropolis city;
+	final ToolPreview preview;
+	final int originX;
+	final int originY;
+
+	ToolEffect(Micropolis city, int xpos, int ypos)
+	{
+		this.city = city;
+		this.preview = new ToolPreview();
+		this.originX = xpos;
+		this.originY = ypos;
+	}
+
+	//implements ToolEffectIfc
+	public int getTile(int dx, int dy)
+	{
+		int c = preview.getTile(dx, dy);
+		if (c != CLEAR) {
+			return c;
+		}
+
+		if (city.testBounds(originX + dx, originY + dy)) {
+			return city.getTile(originX + dx, originY + dy);
+		}
+		else {
+			return CLEAR;
+		}
+	}
+
+	//implements ToolEffectIfc
+	public void setTile(int dx, int dy, int tileValue)
+	{
+		preview.setTile(dx, dy, tileValue);
+	}
+
+	//implements ToolEffectIfc
+	public void spend(int amount)
+	{
+		preview.spend(amount);
+	}
+
+	ToolResult apply()
+	{
+		if (originX - preview.offsetX < 0 ||
+			originX - preview.offsetX >= city.getWidth() ||
+			originY - preview.offsetY < 0 ||
+			originY - preview.offsetY >= city.getHeight())
+		{
+			return ToolResult.UH_OH;
+		}
+
+		if (city.budget.totalFunds < preview.cost) {
+			return ToolResult.INSUFFICIENT_FUNDS;
+		}
+
+		boolean anyFound = false;
+		for (int y = 0; y < preview.tiles.length; y++) {
+			for (int x = 0; x < preview.tiles[y].length; x++) {
+				int c = preview.tiles[y][x];
+				if (c != CLEAR) {
+					city.setTile(originX + x - preview.offsetX, originY + y - preview.offsetY, (char) c);
+					anyFound = true;
+				}
+			}
+		}
+		return anyFound && preview.cost != 0 ?
+			ToolResult.SUCCESS :
+			ToolResult.NONE;
+	}
+}

src/micropolisj/engine/ToolPreview.java

@@ -5,17 +5,13 @@ import static micropolisj.engine.TileConstants.*;
 
 public class ToolPreview implements ToolEffectIfc
 {
-	public int originX;
-	public int originY;
 	public int offsetX;
 	public int offsetY;
 	public short [][] tiles;
 	public int cost;
 
-	ToolPreview(int x, int y)
+	ToolPreview()
 	{
-		this.originX = x;
-		this.originY = y;
 		this.tiles = new short[1][1];
 		this.tiles[0][0] = CLEAR;
 	}