| /* |
| * 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.threed; |
| |
| import java.util.function.BiFunction; |
| |
| import org.apache.commons.geometry.core.partitioning.AbstractEmbeddingSubHyperplane; |
| import org.apache.commons.geometry.core.partitioning.Hyperplane; |
| import org.apache.commons.geometry.core.partitioning.HyperplaneBoundedRegion; |
| import org.apache.commons.geometry.core.partitioning.Split; |
| import org.apache.commons.geometry.core.partitioning.SplitLocation; |
| import org.apache.commons.geometry.core.precision.DoublePrecisionContext; |
| import org.apache.commons.geometry.euclidean.threed.SubPlane.SubPlaneBuilder; |
| import org.apache.commons.geometry.euclidean.twod.Line; |
| import org.apache.commons.geometry.euclidean.twod.Vector2D; |
| |
| /** Internal base class for subplane implementations. |
| * @param <R> Subspace region type |
| */ |
| abstract class AbstractSubPlane<R extends HyperplaneBoundedRegion<Vector2D>> |
| extends AbstractEmbeddingSubHyperplane<Vector3D, Vector2D, Plane> { |
| /** The plane defining this instance. */ |
| private final Plane plane; |
| |
| /** Construct a new instance based on the given plane. |
| * @param plane the plane defining the subplane |
| */ |
| AbstractSubPlane(final Plane plane) { |
| this.plane = plane; |
| } |
| |
| /** Get the plane that this subplane lies on. This method is an alias |
| * for {@link #getHyperplane()}. |
| * @return the plane that this subplane lies on |
| * @see #getHyperplane() |
| */ |
| public Plane getPlane() { |
| return getHyperplane(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Plane getHyperplane() { |
| return plane; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public SubPlaneBuilder builder() { |
| return new SubPlaneBuilder(plane); |
| } |
| |
| /** Return the object used to perform floating point comparisons, which is the |
| * same object used by the underlying {@link Plane}). |
| * @return precision object used to perform floating point comparisons. |
| */ |
| public DoublePrecisionContext getPrecision() { |
| return plane.getPrecision(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String toString() { |
| final StringBuilder sb = new StringBuilder(); |
| sb.append(getClass().getSimpleName()) |
| .append("[plane= ") |
| .append(getPlane()) |
| .append(", subspaceRegion= ") |
| .append(getSubspaceRegion()) |
| .append(']'); |
| |
| |
| return sb.toString(); |
| } |
| |
| /** Generic, internal split method. Subclasses should call this from their |
| * {@link #split(Hyperplane)} methods. |
| * @param splitter splitting hyperplane |
| * @param thisInstance a reference to the current instance; this is passed as |
| * an argument in order to allow it to be a generic type |
| * @param factory function used to create new subhyperplane instances |
| * @param <T> Subplane implementation type |
| * @return the result of the split operation |
| */ |
| protected <T extends AbstractSubPlane<R>> Split<T> splitInternal(final Hyperplane<Vector3D> splitter, |
| final T thisInstance, final BiFunction<Plane, HyperplaneBoundedRegion<Vector2D>, T> factory) { |
| |
| final Plane thisPlane = thisInstance.getPlane(); |
| final Plane splitterPlane = (Plane) splitter; |
| final DoublePrecisionContext precision = thisInstance.getPrecision(); |
| |
| final Line3D intersection = thisPlane.intersection(splitterPlane); |
| if (intersection == null) { |
| // the planes are parallel or coincident; check which side of |
| // the splitter we lie on |
| final double offset = splitterPlane.offset(thisPlane); |
| final int comp = precision.compare(offset, 0.0); |
| |
| if (comp < 0) { |
| return new Split<>(thisInstance, null); |
| } else if (comp > 0) { |
| return new Split<>(null, thisInstance); |
| } else { |
| return new Split<>(null, null); |
| } |
| } else { |
| // the lines intersect; split the subregion |
| final Vector3D intersectionOrigin = intersection.getOrigin(); |
| final Vector2D subspaceP1 = thisPlane.toSubspace(intersectionOrigin); |
| final Vector2D subspaceP2 = thisPlane.toSubspace(intersectionOrigin.add(intersection.getDirection())); |
| |
| final Line subspaceSplitter = Line.fromPoints(subspaceP1, subspaceP2, getPrecision()); |
| |
| final Split<? extends HyperplaneBoundedRegion<Vector2D>> split = |
| thisInstance.getSubspaceRegion().split(subspaceSplitter); |
| final SplitLocation subspaceSplitLoc = split.getLocation(); |
| |
| if (SplitLocation.MINUS == subspaceSplitLoc) { |
| return new Split<>(thisInstance, null); |
| } else if (SplitLocation.PLUS == subspaceSplitLoc) { |
| return new Split<>(null, thisInstance); |
| } |
| |
| final T minus = (split.getMinus() != null) ? factory.apply(getPlane(), split.getMinus()) : null; |
| final T plus = (split.getPlus() != null) ? factory.apply(getPlane(), split.getPlus()) : null; |
| |
| return new Split<>(minus, plus); |
| } |
| } |
| } |