darkma773r commented on code in PR #218: URL: https://github.com/apache/commons-geometry/pull/218#discussion_r1283691118
########## commons-geometry-euclidean/src/main/java/org/apache/commons/geometry/euclidean/twod/hull/ConvexHull2D.java: ########## @@ -0,0 +1,475 @@ +/* + * 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.geometry.euclidean.twod.hull; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.Iterator; +import java.util.List; + +import org.apache.commons.geometry.core.ConvexHull; +import org.apache.commons.geometry.euclidean.EuclideanCollections; +import org.apache.commons.geometry.euclidean.twod.ConvexArea; +import org.apache.commons.geometry.euclidean.twod.Lines; +import org.apache.commons.geometry.euclidean.twod.Vector2D; +import org.apache.commons.geometry.euclidean.twod.path.LinePath; +import org.apache.commons.numbers.core.Precision; + +/** + * This class represents a convex hull in two-dimensional Euclidean space. + */ +public final class ConvexHull2D implements ConvexHull<Vector2D> { + + /** Vertices for the convex hull, in order. */ + private final List<Vector2D> vertices; + + /** Polyline path for the convex hull. */ + private final LinePath path; + + /** Simple constructor; no validation is performed. + * @param vertices the vertices of the convex hull; callers are responsible for ensuring that + * the given vertices are in order, unique, and define a convex hull. + * @param precision precision context used to compare floating point numbers + */ + ConvexHull2D(final Collection<Vector2D> vertices, final Precision.DoubleEquivalence precision) { + this.vertices = Collections.unmodifiableList(new ArrayList<>(vertices)); + this.path = buildHullPath(vertices, precision); + } + + /** {@inheritDoc} */ + @Override + public List<Vector2D> getVertices() { + return vertices; + } + + /** Get a path defining the convex hull. The path will contain + * <ul> + * <li>zero segments if the hull consists of only a single point,</li> + * <li>one segment if the hull consists of two points,</li> + * <li>three or more segments defining a closed loop if the hull consists of more than + * two non-collinear points.</li> + * </ul> + * @return polyline path defining the convex hull + */ + public LinePath getPath() { + return path; + } + + /** {@inheritDoc} */ + @Override + public ConvexArea getRegion() { + return path.isClosed() ? + ConvexArea.convexPolygonFromPath(path) : + null; + } + + /** {@inheritDoc} */ + @Override + public String toString() { + final StringBuilder sb = new StringBuilder(); + sb.append(getClass().getSimpleName()) + .append("[vertices= ") + .append(getVertices()) Review Comment: That sounds good to me. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
