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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.apache.commons.math3.geometry.spherical.oned;
import org.apache.commons.math3.geometry.Point;
import org.apache.commons.math3.geometry.partitioning.Hyperplane;
/** This class represents a 1D oriented hyperplane on the circle.
* <p>An hyperplane on the 1-sphere is an angle with an orientation.</p>
* <p>Instances of this class are guaranteed to be immutable.</p>
* @since 3.3
*/
public class LimitAngle implements Hyperplane<Sphere1D> {
/** Angle location. */
private S1Point location;
/** Orientation. */
private boolean direct;
/** Tolerance below which angles are considered identical. */
private final double tolerance;
/** Simple constructor.
* @param location location of the hyperplane
* @param direct if true, the plus side of the hyperplane is towards
* angles greater than {@code location}
* @param tolerance tolerance below which angles are considered identical
*/
public LimitAngle(final S1Point location, final boolean direct, final double tolerance) {
this.location = location;
this.direct = direct;
this.tolerance = tolerance;
}
/** Copy the instance.
* <p>Since instances are immutable, this method directly returns
* the instance.</p>
* @return the instance itself
*/
public LimitAngle copySelf() {
return this;
}
/** {@inheritDoc} */
public double getOffset(final Point<Sphere1D> point) {
final double delta = ((S1Point) point).getAlpha() - location.getAlpha();
return direct ? delta : -delta;
}
/** Check if the hyperplane orientation is direct.
* @return true if the plus side of the hyperplane is towards
* angles greater than hyperplane location
*/
public boolean isDirect() {
return direct;
}
/** Get the reverse of the instance.
* <p>Get a limit angle with reversed orientation with respect to the
* instance. A new object is built, the instance is untouched.</p>
* @return a new limit angle, with orientation opposite to the instance orientation
*/
public LimitAngle getReverse() {
return new LimitAngle(location, !direct, tolerance);
}
/** Build a region covering the whole hyperplane.
* <p>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.apache.commons.math3.geometry.partitioning.SubHyperplane SubHyperplane}.
* This implementation is only used to allow the {@link
* org.apache.commons.math3.geometry.partitioning.SubHyperplane
* SubHyperplane} class implementation to work properly, it should
* <em>not</em> be used otherwise.</p>
* @return a dummy sub hyperplane
*/
public SubLimitAngle wholeHyperplane() {
return new SubLimitAngle(this, null);
}
/** Build a region covering the whole space.
* @return a region containing the instance (really an {@link
* ArcsSet IntervalsSet} instance)
*/
public ArcsSet wholeSpace() {
return new ArcsSet(tolerance);
}
/** {@inheritDoc} */
public boolean sameOrientationAs(final Hyperplane<Sphere1D> other) {
return !(direct ^ ((LimitAngle) other).direct);
}
/** Get the hyperplane location on the circle.
* @return the hyperplane location
*/
public S1Point getLocation() {
return location;
}
/** {@inheritDoc} */
public Point<Sphere1D> project(Point<Sphere1D> point) {
return location;
}
/** {@inheritDoc} */
public double getTolerance() {
return tolerance;
}
}
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