Implement contract/expand(Vector...) for Cylinder & Ellipsoid

src/main/java/com/sk89q/worldedit/regions/CylinderRegion.java

@@ -213,6 +213,21 @@ public class CylinderRegion extends AbstractRegion {
         return (int) (2 * radius.getZ());
     }
 
+    private Vector2D getTotalXZChanges(Vector... changes) throws RegionOperationException {
+        Vector2D diff = new Vector2D();
+        Vector2D total = new Vector2D();
+        for (Vector change : changes) {
+            diff = diff.add(change.toVector2D());
+            total = total.add(change.toVector2D().positive());
+        }
+
+        if (diff.getBlockX() != 0 || diff.getBlockZ() != 0) {
+            throw new RegionOperationException("Cylinders changes must be equal for both directions of each horizontal dimensions.");
+        }
+
+        return total.divide(2).floor();
+    }
+
     /**
      * Expand the region.
      *
@@ -231,6 +246,20 @@ public class CylinderRegion extends AbstractRegion {
         }
     }
 
+    /**
+     * Expand the region.
+     * Expand the region.
+     *
+     * @param changes array/arguments with multiple related changes
+     * @throws RegionOperationException
+     */
+    public void expand(Vector... changes) throws RegionOperationException {
+        radius = radius.add(getTotalXZChanges(changes));
+        for (Vector change : changes) {
+            expand(new Vector(0, change.getBlockY(), 0));
+        }
+    }
+
     /**
      * Contract the region.
      *
@@ -249,6 +278,20 @@ public class CylinderRegion extends AbstractRegion {
         }
     }
 
+    /**
+     * Contract the region.
+     *
+     * @param changes array/arguments with multiple related changes
+     * @throws RegionOperationException
+     */
+    public void contract(Vector... changes) throws RegionOperationException {
+        Vector2D newRadius = radius.subtract(getTotalXZChanges(changes));
+        radius = Vector2D.getMaximum(new Vector2D(1.5, 1.5), newRadius);
+        for (Vector change : changes) {
+            contract(new Vector(0, change.getBlockY(), 0));
+        }
+    }
+
     @Override
     public void shift(Vector change) throws RegionOperationException {
         setCenter(getCenter().add(change));

src/main/java/com/sk89q/worldedit/regions/EllipsoidRegion.java

@@ -120,6 +120,22 @@ public class EllipsoidRegion extends AbstractRegion {
         return (int) (2 * radius.getZ());
     }
 
+    private Vector getTotalChanges(Vector... changes) throws RegionOperationException {
+        Vector diff = new Vector();
+        Vector total = new Vector();
+        for (Vector change : changes) {
+            diff = diff.add(change);
+            total = total.add(change.positive());
+        }
+
+        if (diff.getBlockX() != 0 || diff.getBlockY() != 0 || diff.getBlockZ() != 0) {
+            throw new RegionOperationException(
+                    "Ellipsoid changes must be equal for both directions of each dimensions.");
+        }
+
+        return total.divide(2).floor();
+    }
+
     /**
      * Expands the ellipsoid in a direction.
      *
@@ -128,6 +144,16 @@ public class EllipsoidRegion extends AbstractRegion {
     public void expand(Vector change) {
     }
 
+    /**
+     * Expand the region.
+     *
+     * @param changes array/arguments with multiple related changes
+     * @throws RegionOperationException
+     */
+    public void expand(Vector... changes) throws RegionOperationException {
+        radius = radius.add(getTotalChanges(changes));
+    }
+
     /**
      * Contracts the ellipsoid in a direction.
      *
@@ -136,6 +162,17 @@ public class EllipsoidRegion extends AbstractRegion {
     public void contract(Vector change) {
     }
 
+    /**
+     * Contract the region.
+     *
+     * @param changes array/arguments with multiple related changes
+     * @throws RegionOperationException
+     */
+    public void contract(Vector... changes) throws RegionOperationException {
+        Vector newRadius = radius.subtract(getTotalChanges(changes));
+        radius = Vector.getMaximum(new Vector(1.5, 1.5, 1.5), newRadius);
+    }
+
     @Override
     public void shift(Vector change) throws RegionOperationException {
         center = center.add(change);