| /* |
| * 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.core.partitioning; |
| |
| import org.apache.commons.geometry.core.Point; |
| |
| /** This interface defines mappers between a space and one of its sub-spaces. |
| |
| * <p>Sub-spaces are the lower dimensions subsets of a n-dimensions |
| * space. The (n-1)-dimension sub-spaces are specific sub-spaces known |
| * as {@link Hyperplane hyperplanes}. This interface can be used regardless |
| * of the dimensions differences. For example, a line in 3D Euclidean space |
| * can map directly from 3 dimensions to 1.</p> |
| |
| * <p>In the 3D Euclidean space, hyperplanes are 2D planes, and the 1D |
| * sub-spaces are lines.</p> |
| |
| * <p> |
| * Note that this interface is <em>not</em> intended to be implemented |
| * by Apache Commons Geometry users, it is only intended to be implemented |
| * within the library itself. New methods may be added even for minor |
| * versions, which breaks compatibility for external implementations. |
| * </p> |
| |
| * @param <P> Point type defining the embedding space. |
| * @param <S> Point type defining the embedded sub-space. |
| |
| * @see Hyperplane |
| */ |
| public interface Embedding<P extends Point<P>, S extends Point<S>> { |
| |
| /** Transform a space point into a sub-space point. |
| * @param point n-dimension point of the space |
| * @return (n-1)-dimension point of the sub-space corresponding to |
| * the specified space point |
| * @see #toSpace |
| */ |
| S toSubSpace(P point); |
| |
| /** Transform a sub-space point into a space point. |
| * @param point (n-1)-dimension point of the sub-space |
| * @return n-dimension point of the space corresponding to the |
| * specified sub-space point |
| * @see #toSubSpace |
| */ |
| P toSpace(S point); |
| |
| } |