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The Hipparchus geometry module
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/*
 * 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.hipparchus.geometry.euclidean.oned;

import org.hipparchus.geometry.Point;
import org.hipparchus.geometry.Vector;
import org.hipparchus.geometry.partitioning.Hyperplane;

/** This class represents a 1D oriented hyperplane.
 * An hyperplane in 1D is a simple point, its orientation being a
 * boolean.
 * Instances of this class are guaranteed to be immutable.
 */
public class OrientedPoint implements Hyperplane {

    /** Vector location. */
    private final Vector1D location;

    /** Orientation. */
    private boolean direct;

    /** Tolerance below which points are considered to belong to the hyperplane. */
    private final double tolerance;

    /** Simple constructor.
     * @param location location of the hyperplane
     * @param direct if true, the plus side of the hyperplane is towards
     * abscissas greater than {@code location}
     * @param tolerance tolerance below which points are considered to belong to the hyperplane
     */
    public OrientedPoint(final Vector1D location, final boolean direct, final double tolerance) {
        this.location  = location;
        this.direct    = direct;
        this.tolerance = tolerance;
    }

    /** Copy the instance.
     * Since instances are immutable, this method directly returns
     * the instance.
     * @return the instance itself
     */
    @Override
    public OrientedPoint copySelf() {
        return this;
    }

    /** Get the offset (oriented distance) of a vector.
     * @param vector vector to check
     * @return offset of the vector
     */
    public double getOffset(Vector vector) {
        return getOffset((Point) vector);
    }

    /** {@inheritDoc} */
    @Override
    public double getOffset(final Point point) {
        final double delta = ((Vector1D) point).getX() - location.getX();
        return direct ? delta : -delta;
    }

    /** Build a region covering the whole hyperplane.
     * Since this class represent zero dimension spaces which does
     * not have lower dimension sub-spaces, this method returns a dummy
     * implementation of a {@link
     * org.hipparchus.geometry.partitioning.SubHyperplane SubHyperplane}.
     * This implementation is only used to allow the {@link
     * org.hipparchus.geometry.partitioning.SubHyperplane
     * SubHyperplane} class implementation to work properly, it should
     * not be used otherwise.
     * @return a dummy sub hyperplane
     */
    @Override
    public SubOrientedPoint wholeHyperplane() {
        return new SubOrientedPoint(this, null);
    }

    /** Build a region covering the whole space.
     * @return a region containing the instance (really an {@link
     * IntervalsSet IntervalsSet} instance)
     */
    @Override
    public IntervalsSet wholeSpace() {
        return new IntervalsSet(tolerance);
    }

    /** {@inheritDoc} */
    @Override
    public boolean sameOrientationAs(final Hyperplane other) {
        return !(direct ^ ((OrientedPoint) other).direct);
    }

    /** {@inheritDoc}
     */
    @Override
    public Point project(Point point) {
        return location;
    }

    /** {@inheritDoc}
     */
    @Override
    public double getTolerance() {
        return tolerance;
    }

    /** Get the hyperplane location on the real line.
     * @return the hyperplane location
     */
    public Vector1D getLocation() {
        return location;
    }

    /** Check if the hyperplane orientation is direct.
     * @return true if the plus side of the hyperplane is towards
     * abscissae greater than hyperplane location
     */
    public boolean isDirect() {
        return direct;
    }

    /** Revert the instance.
     */
    public void revertSelf() {
        direct = !direct;
    }

}