Merge pull request #287

src/bukkit/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -23,11 +23,13 @@ import com.sk89q.util.yaml.YAMLProcessor;
 import com.sk89q.wepif.PermissionsResolverManager;
 import com.sk89q.worldedit.*;
 import com.sk89q.worldedit.bukkit.selections.CuboidSelection;
+import com.sk89q.worldedit.bukkit.selections.CylinderSelection;
 import com.sk89q.worldedit.bukkit.selections.Polygonal2DSelection;
 import com.sk89q.worldedit.bukkit.selections.Selection;
 import com.sk89q.worldedit.extension.platform.PlatformRejectionException;
 import com.sk89q.worldedit.extent.inventory.BlockBag;
 import com.sk89q.worldedit.regions.CuboidRegion;
+import com.sk89q.worldedit.regions.CylinderRegion;
 import com.sk89q.worldedit.regions.Polygonal2DRegion;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.regions.RegionSelector;
@@ -389,6 +391,8 @@ public class WorldEditPlugin extends JavaPlugin {
                 return new CuboidSelection(world, selector, (CuboidRegion) region);
             } else if (region instanceof Polygonal2DRegion) {
                 return new Polygonal2DSelection(world, selector, (Polygonal2DRegion) region);
+            } else if (region instanceof CylinderRegion) {
+                return new CylinderSelection(world, selector, (CylinderRegion) region);
             } else {
                 return null;
             }

src/main/java/com/sk89q/worldedit/bukkit/selections/CylinderSelection.java

@@ -0,0 +1,80 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.bukkit.selections;
+
+import com.sk89q.worldedit.regions.selector.CylinderRegionSelector;
+import org.bukkit.World;
+
+import com.sk89q.worldedit.BlockVector2D;
+import com.sk89q.worldedit.LocalWorld;
+import com.sk89q.worldedit.bukkit.BukkitUtil;
+import com.sk89q.worldedit.regions.CylinderRegion;
+import com.sk89q.worldedit.regions.RegionSelector;
+
+/**
+ * A selection representing a {@link CylinderRegion}
+ */
+public class CylinderSelection extends RegionSelection {
+
+    private CylinderRegion cylRegion;
+
+    public CylinderSelection(World world, RegionSelector selector, CylinderRegion region) {
+        super(world, selector, region);
+        this.cylRegion = region;
+    }
+    
+    public CylinderSelection(World world, BlockVector2D center, BlockVector2D radius, int minY, int maxY) {
+        super(world);
+        LocalWorld lWorld = BukkitUtil.getLocalWorld(world);
+
+        // Validate input
+        minY = Math.min(Math.max(0, minY), world.getMaxHeight());
+        maxY = Math.min(Math.max(0, maxY), world.getMaxHeight());
+
+        // Create and set up new selector
+        CylinderRegionSelector sel = new CylinderRegionSelector(lWorld, center, radius, minY, maxY);
+
+        // set up selection
+        cylRegion = sel.getIncompleteRegion();
+
+        // set up RegionSelection
+        setRegionSelector(sel);
+        setRegion(cylRegion);
+    }
+
+    /**
+     * Returns the center vector of the cylinder
+     * 
+     * @return the center
+     */
+    public BlockVector2D getCenter() {
+        return cylRegion.getCenter().toVector2D().toBlockVector2D();
+    }
+
+    /**
+     * Returns the radius vector of the cylinder
+     * 
+     * @return the radius
+     */
+    public BlockVector2D getRadius() {
+        return cylRegion.getRadius().toBlockVector2D();
+    }
+
+}

src/main/java/com/sk89q/worldedit/math/geom/Polygons.java

@@ -0,0 +1,64 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.math.geom;
+
+import com.sk89q.worldedit.BlockVector2D;
+import com.sk89q.worldedit.Vector2D;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper method for anything related to polygons.
+ */
+public final class Polygons {
+
+    private Polygons() {
+        
+    }
+
+    /**
+     * Calculates the polygon shape of a cylinder which can then be used for e.g. intersection detection.
+     * 
+     * @param center the center point of the cylinder
+     * @param radius the radius of the cylinder
+     * @param maxPoints max points to be used for the calculation
+     * @return a list of {@link BlockVector2D} which resemble the shape as a polygon
+     */
+    public static List<BlockVector2D> polygonizeCylinder(Vector2D center, Vector2D radius, int maxPoints) {
+        int nPoints = (int) Math.ceil(Math.PI*radius.length());
+
+        // These strange semantics for maxPoints are copied from the selectSecondary method.
+        if (maxPoints >= 0 && nPoints >= maxPoints) {
+            nPoints = maxPoints - 1;
+        }
+
+        final List<BlockVector2D> points = new ArrayList<BlockVector2D>(nPoints);
+        for (int i = 0; i < nPoints; ++i) {
+            double angle = i * (2.0 * Math.PI) / nPoints;
+            final Vector2D pos = new Vector2D(Math.cos(angle), Math.sin(angle));
+            final BlockVector2D blockVector2D = pos.multiply(radius).add(center).toBlockVector2D();
+            points.add(blockVector2D);
+        }
+
+        return points;
+    }
+    
+}

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

@@ -20,11 +20,11 @@
 package com.sk89q.worldedit.regions;
 
 import com.sk89q.worldedit.*;
+import com.sk89q.worldedit.math.geom.Polygons;
 import com.sk89q.worldedit.regions.iterator.FlatRegion3DIterator;
 import com.sk89q.worldedit.regions.iterator.FlatRegionIterator;
 import com.sk89q.worldedit.world.World;
 
-import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 
@@ -375,22 +375,6 @@ public class CylinderRegion extends AbstractRegion implements FlatRegion {
 
     @Override
     public List<BlockVector2D> polygonize(int maxPoints) {
-        final Vector2D radius = getRadius();
-        int nPoints = (int) Math.ceil(Math.PI*radius.length());
-
-        // These strange semantics for maxPoints are copied from the selectSecondary method.
-        if (maxPoints >= 0 && nPoints >= maxPoints) {
-            nPoints = maxPoints - 1;
-        }
-
-        final List<BlockVector2D> points = new ArrayList<BlockVector2D>(nPoints);
-        for (int i = 0; i < nPoints; ++i) {
-            double angle = i * (2.0 * Math.PI) / nPoints;
-            final Vector2D pos = new Vector2D(Math.cos(angle), Math.sin(angle));
-            final BlockVector2D blockVector2D = pos.multiply(radius).add(center).toBlockVector2D();
-            points.add(blockVector2D);
-        }
-
-        return points;
+        return Polygons.polygonizeCylinder(center, radius, maxPoints);
     }
 }