| /* |
| * 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. |
| */ |
| |
| /** |
| * Basic geometric objects (envelopes and direct positions). Every geometry objects are associated |
| * with a {@linkplain org.apache.sis.referencing.crs.AbstractCRS Coordinate Reference System}, |
| * which may have an arbitrary number of dimensions. However a few specialized classes restrict |
| * the CRS to a fixed number of dimensions only. The table below summarizes the most common |
| * objects, and list the Java2D classes that are conceptually equivalent. |
| * |
| * <table class="sis"> |
| * <caption>Java2D and geometry equivalences</caption> |
| * <tr> |
| * <th>Purpose</th> |
| * <th>Any dimension</th> |
| * <th>One dimension</th> |
| * <th>Two dimensions</th> |
| * <th>Java2D equivalence</th> |
| * </tr><tr> |
| * <td>A point in a multi-dimensional space</td> |
| * <td>{@link org.apache.sis.geometry.GeneralDirectPosition}</td> |
| * <td>{@link org.apache.sis.geometry.DirectPosition1D}</td> |
| * <td>{@link org.apache.sis.geometry.DirectPosition2D}</td> |
| * <td>{@link java.awt.geom.Point2D}</td> |
| * </tr><tr> |
| * <td>A box in a multi-dimensional space</td> |
| * <td>{@link org.apache.sis.geometry.GeneralEnvelope}</td> |
| * <td></td> |
| * <td>{@link org.apache.sis.geometry.Envelope2D}</td> |
| * <td>{@link java.awt.geom.Rectangle2D}</td> |
| * </tr> |
| * </table> |
| * |
| * <h2>Java2D dependency</h2> |
| * All classes having a name that ends with "2D" are designed for inter-operability with Java2D. |
| * All other classes have no dependency to Java2D. |
| * This clear separation aims to make easier to use Apache SIS on platforms that do not support Java2D |
| * (for example Android) or to avoid loading Java2D classes when only JavaFX is desired. |
| * |
| * <h2>Envelopes spanning the anti-meridian of a Geographic CRS</h2> |
| * The Web Coverage Service (WCS) 1.1 specification uses an extended interpretation |
| * of the bounding box definition. In a WCS 1.1 data structure, the |
| * {@linkplain org.apache.sis.geometry.GeneralEnvelope#getLowerCorner() lower corner} |
| * defines the edges region in the directions of <em>decreasing</em> coordinate values in the |
| * {@linkplain org.apache.sis.geometry.GeneralEnvelope#getCoordinateReferenceSystem() envelope CRS}, |
| * while the {@linkplain org.apache.sis.geometry.GeneralEnvelope#getUpperCorner() upper corner} |
| * defines the edges region in the directions of <em>increasing</em> coordinate values. |
| * Those lower and upper corners are usually the algebraic |
| * {@linkplain org.apache.sis.geometry.GeneralEnvelope#getMinimum(int) minimum} and |
| * {@linkplain org.apache.sis.geometry.GeneralEnvelope#getMaximum(int) maximum} coordinates respectively, |
| * but not always. For example, an envelope crossing the anti-meridian could have a lower corner |
| * longitude greater than the upper corner longitude, like the red box below (the green box is the |
| * usual case): |
| * |
| * <div style="text-align:center"> |
| * <img src="doc-files/AntiMeridian.png" alt="Envelope spannning the anti-meridian"> |
| * </div> |
| * |
| * In SIS, every envelopes defined in this package support the extended bounding box interpretation: |
| * for any dimension, coordinate values such that <var>upper</var> < <var>lower</var> are handled |
| * in a special way. This handling is slightly different for two groups of methods: |
| * |
| * <ul> |
| * <li>In calculation of envelopes spans and median positions (centers) — handled specially only |
| * on axes having the {@link org.opengis.referencing.cs.RangeMeaning#WRAPAROUND WRAPAROUND} |
| * range meaning.</li> |
| * <li>When checking for containment, intersections or unions — can be handled specially for |
| * any axis, in which case the envelope represents an <em>exclusion</em> area instead |
| * than an inclusion area.</li> |
| * </ul> |
| * |
| * @see org.apache.sis.setup.GeometryLibrary |
| * |
| * @author Martin Desruisseaux (IRD, Geomatys) |
| * @version 1.0 |
| * @since 0.3 |
| * @module |
| */ |
| package org.apache.sis.geometry; |
