Added sphere brush tool.

src/com/sk89q/worldedit/ReplacingEditSession.java

@@ -0,0 +1,102 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010 sk89q <http://www.sk89q.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package com.sk89q.worldedit;
+
+import com.sk89q.worldedit.bags.BlockBag;
+import com.sk89q.worldedit.blocks.BaseBlock;
+
+/**
+ * An edit session that can be set to not replace existing blocks.
+ * 
+ * @author sk89q
+ */
+public class ReplacingEditSession extends EditSession {
+    /**
+     * True to prevent replacing.
+     */
+    private boolean noReplace = false;
+    
+    /**
+     * Construct the object.
+     * 
+     * @param server
+     * @param world
+     * @param maxBlocks
+     */
+    public ReplacingEditSession(ServerInterface server, LocalWorld world,
+            int maxBlocks) {
+        super(server, world, maxBlocks);
+    }
+
+    /**
+     * Construct the object.
+     * 
+     * @param server
+     * @param world
+     * @param maxBlocks
+     * @param blockBag
+     */
+    public ReplacingEditSession(ServerInterface server, LocalWorld world,
+            int maxBlocks, BlockBag blockBag) {
+        super(server, world, maxBlocks, blockBag);
+    }
+    
+    /**
+     * Enables block replacing.
+     */
+    public void enableReplacing() {
+        noReplace = false;
+    }
+    
+    /**
+     * Disables block replacing.
+     */
+    public void disableReplacing() {
+        noReplace = true;
+    }
+    
+    /**
+     * Sets a block without changing history.
+     * 
+     * @param pt
+     * @param blockType
+     * @return Whether the block changed
+     */
+    public boolean rawSetBlock(Vector pt, BaseBlock block) {
+        if (!noReplace) {
+            return super.rawSetBlock(pt, block);
+        }
+        
+        int y = pt.getBlockY();
+        
+        if (y < 0 || y > 127) {
+            return false;
+        }
+        
+        int existing = world.getBlockType(pt);
+        
+        if (existing != 0) {
+            return false;
+        }
+        
+        return super.rawSetBlock(pt, block);
+    }
+
+}