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Java example source code file (SubPlane.java)

This example Java source code file (SubPlane.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractsubhyperplane, bsptree, euclidean2d, line, override, plane, polygonsset, region, splitsubhyperplane, subplane, vector2d, vector3d

The SubPlane.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math3.geometry.euclidean.threed;

import org.apache.commons.math3.geometry.Point;
import org.apache.commons.math3.geometry.euclidean.oned.Euclidean1D;
import org.apache.commons.math3.geometry.euclidean.oned.Vector1D;
import org.apache.commons.math3.geometry.euclidean.twod.Euclidean2D;
import org.apache.commons.math3.geometry.euclidean.twod.PolygonsSet;
import org.apache.commons.math3.geometry.euclidean.twod.Vector2D;
import org.apache.commons.math3.geometry.partitioning.AbstractSubHyperplane;
import org.apache.commons.math3.geometry.partitioning.BSPTree;
import org.apache.commons.math3.geometry.partitioning.Hyperplane;
import org.apache.commons.math3.geometry.partitioning.Region;
import org.apache.commons.math3.geometry.partitioning.SubHyperplane;

/** This class represents a sub-hyperplane for {@link Plane}.
 * @since 3.0
 */
public class SubPlane extends AbstractSubHyperplane<Euclidean3D, Euclidean2D> {

    /** Simple constructor.
     * @param hyperplane underlying hyperplane
     * @param remainingRegion remaining region of the hyperplane
     */
    public SubPlane(final Hyperplane<Euclidean3D> hyperplane,
                    final Region<Euclidean2D> remainingRegion) {
        super(hyperplane, remainingRegion);
    }

    /** {@inheritDoc} */
    @Override
    protected AbstractSubHyperplane<Euclidean3D, Euclidean2D> buildNew(final Hyperplane hyperplane,
                                                                       final Region<Euclidean2D> remainingRegion) {
        return new SubPlane(hyperplane, remainingRegion);
    }

    /** Split the instance in two parts by an hyperplane.
     * @param hyperplane splitting hyperplane
     * @return an object containing both the part of the instance
     * on the plus side of the instance and the part of the
     * instance on the minus side of the instance
     */
    @Override
    public SplitSubHyperplane<Euclidean3D> split(Hyperplane hyperplane) {

        final Plane otherPlane = (Plane) hyperplane;
        final Plane thisPlane  = (Plane) getHyperplane();
        final Line  inter      = otherPlane.intersection(thisPlane);
        final double tolerance = thisPlane.getTolerance();

        if (inter == null) {
            // the hyperplanes are parallel
            final double global = otherPlane.getOffset(thisPlane);
            if (global < -tolerance) {
                return new SplitSubHyperplane<Euclidean3D>(null, this);
            } else if (global > tolerance) {
                return new SplitSubHyperplane<Euclidean3D>(this, null);
            } else {
                return new SplitSubHyperplane<Euclidean3D>(null, null);
            }
        }

        // the hyperplanes do intersect
        Vector2D p = thisPlane.toSubSpace((Point<Euclidean3D>) inter.toSpace((Point) Vector1D.ZERO));
        Vector2D q = thisPlane.toSubSpace((Point<Euclidean3D>) inter.toSpace((Point) Vector1D.ONE));
        Vector3D crossP = Vector3D.crossProduct(inter.getDirection(), thisPlane.getNormal());
        if (crossP.dotProduct(otherPlane.getNormal()) < 0) {
            final Vector2D tmp = p;
            p           = q;
            q           = tmp;
        }
        final SubHyperplane<Euclidean2D> l2DMinus =
            new org.apache.commons.math3.geometry.euclidean.twod.Line(p, q, tolerance).wholeHyperplane();
        final SubHyperplane<Euclidean2D> l2DPlus =
            new org.apache.commons.math3.geometry.euclidean.twod.Line(q, p, tolerance).wholeHyperplane();

        final BSPTree<Euclidean2D> splitTree = getRemainingRegion().getTree(false).split(l2DMinus);
        final BSPTree<Euclidean2D> plusTree  = getRemainingRegion().isEmpty(splitTree.getPlus()) ?
                                               new BSPTree<Euclidean2D>(Boolean.FALSE) :
                                               new BSPTree<Euclidean2D>(l2DPlus, new BSPTree(Boolean.FALSE),
                                                                        splitTree.getPlus(), null);

        final BSPTree<Euclidean2D> minusTree = getRemainingRegion().isEmpty(splitTree.getMinus()) ?
                                               new BSPTree<Euclidean2D>(Boolean.FALSE) :
                                                   new BSPTree<Euclidean2D>(l2DMinus, new BSPTree(Boolean.FALSE),
                                                                            splitTree.getMinus(), null);

        return new SplitSubHyperplane<Euclidean3D>(new SubPlane(thisPlane.copySelf(), new PolygonsSet(plusTree, tolerance)),
                                                   new SubPlane(thisPlane.copySelf(), new PolygonsSet(minusTree, tolerance)));

    }

}

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