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

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+/*
+ * 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.regions;
+
+import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.BlockVector2D;
+import com.sk89q.worldedit.LocalWorld;
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.Vector2D;
+import com.sk89q.worldedit.world.World;
+import com.sk89q.worldedit.world.storage.ChunkStore;
+import java.util.Set;
+import java.util.HashSet;
+
+/**
+ * Represents an ellipsoid region.
+ */
+public class EllipsoidRegion extends AbstractRegion {
+
+    /**
+     * Stores the center.
+     */
+    private Vector center;
+
+    /**
+     * Stores the radii plus 0.5 on each axis.
+     */
+    private Vector radius;
+
+    /**
+     * Construct a new instance of this ellipsoid region.
+     *
+     * @param pos1 the first position
+     * @param pos2 the second position
+     */
+    public EllipsoidRegion(Vector pos1, Vector pos2) {
+        this(null, pos1, pos2);
+    }
+
+    @Deprecated
+    public EllipsoidRegion(LocalWorld world, Vector center, Vector radius) {
+        this((World) world, center, radius);
+    }
+
+    /**
+     * Construct a new instance of this ellipsoid region.
+     *
+     * @param world the world
+     * @param center the center
+     * @param radius the radius
+     */
+    public EllipsoidRegion(World world, Vector center, Vector radius) {
+        super(world);
+        this.center = center;
+        setRadius(radius);
+    }
+
+    public EllipsoidRegion(EllipsoidRegion ellipsoidRegion) {
+        this(ellipsoidRegion.world, ellipsoidRegion.center, ellipsoidRegion.getRadius());
+    }
+
+    @Override
+    public Vector getMinimumPoint() {
+        return center.subtract(getRadius());
+    }
+
+    @Override
+    public Vector getMaximumPoint() {
+        return center.add(getRadius());
+    }
+
+    @Override
+    public int getArea() {
+        return (int) Math.floor((4.0 / 3.0) * Math.PI * radius.getX() * radius.getY() * radius.getZ());
+    }
+
+    @Override
+    public int getWidth() {
+        return (int) (2 * radius.getX());
+    }
+
+    @Override
+    public int getHeight() {
+        return (int) (2 * radius.getY());
+    }
+
+    @Override
+    public int getLength() {
+        return (int) (2 * radius.getZ());
+    }
+
+    private Vector calculateDiff(Vector... changes) throws RegionOperationException {
+        Vector diff = new Vector().add(changes);
+
+        if ((diff.getBlockX() & 1) + (diff.getBlockY() & 1) + (diff.getBlockZ() & 1) != 0) {
+            throw new RegionOperationException(
+                    "Ellipsoid changes must be even for each dimensions.");
+        }
+
+        return diff.divide(2).floor();
+    }
+
+    private Vector calculateChanges(Vector... changes) {
+        Vector total = new Vector();
+        for (Vector change : changes) {
+            total = total.add(change.positive());
+        }
+
+        return total.divide(2).floor();
+    }
+
+    @Override
+    public void expand(Vector... changes) throws RegionOperationException {
+        center = center.add(calculateDiff(changes));
+        radius = radius.add(calculateChanges(changes));
+    }
+
+    @Override
+    public void contract(Vector... changes) throws RegionOperationException {
+        center = center.subtract(calculateDiff(changes));
+        Vector newRadius = radius.subtract(calculateChanges(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);
+    }
+
+    /**
+     * Get the center.
+     *
+     * @return center
+     */
+    @Override
+    public Vector getCenter() {
+        return center;
+    }
+
+    /**
+     * Set the center.
+     *
+     * @param center the center
+     */
+    public void setCenter(Vector center) {
+        this.center = center;
+    }
+
+    /**
+     * Get the radii.
+     *
+     * @return radii
+     */
+    public Vector getRadius() {
+        return radius.subtract(0.5, 0.5, 0.5);
+    }
+
+    /**
+     * Set the radii.
+     *
+     * @param radius the radius
+     */
+    public void setRadius(Vector radius) {
+        this.radius = radius.add(0.5, 0.5, 0.5);
+    }
+
+    @Override
+    public Set<Vector2D> getChunks() {
+        final Set<Vector2D> chunks = new HashSet<Vector2D>();
+
+        final Vector min = getMinimumPoint();
+        final Vector max = getMaximumPoint();
+        final int centerY = getCenter().getBlockY();
+
+        for (int x = min.getBlockX(); x <= max.getBlockX(); ++x) {
+            for (int z = min.getBlockZ(); z <= max.getBlockZ(); ++z) {
+                if (!contains(new BlockVector(x, centerY, z))) {
+                    continue;
+                }
+
+                chunks.add(new BlockVector2D(
+                    x >> ChunkStore.CHUNK_SHIFTS,
+                    z >> ChunkStore.CHUNK_SHIFTS
+                ));
+            }
+        }
+
+        return chunks;
+    }
+
+    @Override
+    public boolean contains(Vector position) {
+        return position.subtract(center).divide(radius).lengthSq() <= 1;
+    }
+
+    /**
+     * Returns string representation in the format
+     * "(centerX, centerY, centerZ) - (radiusX, radiusY, radiusZ)".
+     *
+     * @return string
+     */
+    @Override
+    public String toString() {
+        return center + " - " + getRadius();
+    }
+
+    public void extendRadius(Vector minRadius) {
+        setRadius(Vector.getMaximum(minRadius, getRadius()));
+    }
+
+    @Override
+    public EllipsoidRegion clone() {
+        return (EllipsoidRegion) super.clone();
+    }
+
+}