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Java example source code file (Arc.java)

This example Java source code file (Arc.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

arc, location, numberistoolargeexception

The Arc.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.spherical.oned;

import org.apache.commons.math3.exception.NumberIsTooLargeException;
import org.apache.commons.math3.exception.util.LocalizedFormats;
import org.apache.commons.math3.geometry.partitioning.Region.Location;
import org.apache.commons.math3.util.FastMath;
import org.apache.commons.math3.util.MathUtils;
import org.apache.commons.math3.util.Precision;


/** This class represents an arc on a circle.
 * @see ArcsSet
 * @since 3.3
 */
public class Arc {

    /** The lower angular bound of the arc. */
    private final double lower;

    /** The upper angular bound of the arc. */
    private final double upper;

    /** Middle point of the arc. */
    private final double middle;

    /** Tolerance below which angles are considered identical. */
    private final double tolerance;

    /** Simple constructor.
     * <p>
     * If either {@code lower} is equals to {@code upper} or
     * the interval exceeds \( 2 \pi \), the arc is considered
     * to be the full circle and its initial defining boundaries
     * will be forgotten. {@code lower} is not allowed to be
     * greater than {@code upper} (an exception is thrown in this case).
     * {@code lower} will be canonicalized between 0 and \( 2 \pi \), and
     * upper shifted accordingly, so the {@link #getInf()} and {@link #getSup()}
     * may not return the value used at instance construction.
     * </p>
     * @param lower lower angular bound of the arc
     * @param upper upper angular bound of the arc
     * @param tolerance tolerance below which angles are considered identical
     * @exception NumberIsTooLargeException if lower is greater than upper
     */
    public Arc(final double lower, final double upper, final double tolerance)
        throws NumberIsTooLargeException {
        this.tolerance = tolerance;
        if (Precision.equals(lower, upper, 0) || (upper - lower) >= MathUtils.TWO_PI) {
            // the arc must cover the whole circle
            this.lower  = 0;
            this.upper  = MathUtils.TWO_PI;
            this.middle = FastMath.PI;
        } else  if (lower <= upper) {
            this.lower  = MathUtils.normalizeAngle(lower, FastMath.PI);
            this.upper  = this.lower + (upper - lower);
            this.middle = 0.5 * (this.lower + this.upper);
        } else {
            throw new NumberIsTooLargeException(LocalizedFormats.ENDPOINTS_NOT_AN_INTERVAL,
                                                lower, upper, true);
        }
    }

    /** Get the lower angular bound of the arc.
     * @return lower angular bound of the arc,
     * always between 0 and \( 2 \pi \)
     */
    public double getInf() {
        return lower;
    }

    /** Get the upper angular bound of the arc.
     * @return upper angular bound of the arc,
     * always between {@link #getInf()} and {@link #getInf()} \( + 2 \pi \)
     */
    public double getSup() {
        return upper;
    }

    /** Get the angular size of the arc.
     * @return angular size of the arc
     */
    public double getSize() {
        return upper - lower;
    }

    /** Get the barycenter of the arc.
     * @return barycenter of the arc
     */
    public double getBarycenter() {
        return middle;
    }

    /** Get the tolerance below which angles are considered identical.
     * @return tolerance below which angles are considered identical
     */
    public double getTolerance() {
        return tolerance;
    }

    /** Check a point with respect to the arc.
     * @param point point to check
     * @return a code representing the point status: either {@link
     * Location#INSIDE}, {@link Location#OUTSIDE} or {@link Location#BOUNDARY}
     */
    public Location checkPoint(final double point) {
        final double normalizedPoint = MathUtils.normalizeAngle(point, middle);
        if (normalizedPoint < lower - tolerance || normalizedPoint > upper + tolerance) {
            return Location.OUTSIDE;
        } else if (normalizedPoint > lower + tolerance && normalizedPoint < upper - tolerance) {
            return Location.INSIDE;
        } else {
            return (getSize() >= MathUtils.TWO_PI - tolerance) ? Location.INSIDE : Location.BOUNDARY;
        }
    }

}

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