Added an ArbitraryShape class which can be used to generate hollow and solid shapes based on an in/out condition.

src/main/java/com/sk89q/worldedit/ArbitraryShape.java

@@ -0,0 +1,90 @@
+// $Id$
+/*
+ * 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.patterns.Pattern;
+import com.sk89q.worldedit.regions.Region;
+
+public abstract class ArbitraryShape {
+    private Region extent;
+
+    public ArbitraryShape(Region extent) {
+        this.extent = extent;
+    }
+
+    protected Region getExtent() {
+        return extent;
+    }
+
+    protected abstract boolean isInside(double x, double y, double z);
+
+    public int generate(EditSession editSession, Pattern pattern, boolean hollow) throws MaxChangedBlocksException {
+        int affected = 0;
+
+        for (BlockVector position : getExtent()) {
+            double x = position.getX();
+            double y = position.getY();
+            double z = position.getZ();
+
+            if (!isInside(x, y, z))
+                continue;
+
+            if (hollow) {
+                boolean draw = false;
+                do {
+                    if (!isInside(x+1, y, z)) {
+                        draw = true;
+                        break;
+                    }
+                    if (!isInside(x-1, y, z)) {
+                        draw = true;
+                        break;
+                    }
+                    if (!isInside(x, y+1, z)) {
+                        draw = true;
+                        break;
+                    }
+                    if (!isInside(x, y-1, z)) {
+                        draw = true;
+                        break;
+                    }
+                    if (!isInside(x, y, z+1)) {
+                        draw = true;
+                        break;
+                    }
+                    if (!isInside(x, y, z-1)) {
+                        draw = true;
+                        break;
+                    }
+                } while (false);
+
+                if (!draw) {
+                    continue;
+                }
+            }
+
+            if (editSession.setBlock(position, pattern)) {
+                ++affected;
+            }
+        }
+
+        return affected;
+    }
+}