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src/main/java/org/terasology/logic/location/DistanceComparator.java
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| /* | ||
| * Copyright 2013 Moving Blocks | ||
| * | ||
| * Licensed 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.terasology.logic.location; | ||
|
|
||
| import org.terasology.entitySystem.EntityRef; | ||
|
|
||
| import javax.vecmath.Tuple3f; | ||
| import javax.vecmath.Vector3f; | ||
| import java.util.Comparator; | ||
|
|
||
| /** | ||
| * Comparator that compares the distances to a location of two Entities. | ||
| * Closer is smaller, hence return -1, which results in lower index for | ||
| * closer the object when sorting. | ||
| * Entities without a location component are assumed to be infinitely far | ||
| * away from the location. | ||
| * The location can be given in the constructor and set to a different value | ||
| * afterwards. | ||
| */ | ||
| public class DistanceComparator implements Comparator<EntityRef> { | ||
| /** | ||
| * The distance to this point is taken for the comparison of | ||
| * distances. | ||
| */ | ||
| private final Vector3f origin; | ||
| /** | ||
| * Used to store the location of Entities temporarily. Having | ||
| * this vector pre-allocated saves a lot of memory allocations for new | ||
| * vectors. | ||
| */ | ||
| private final Vector3f temp = new Vector3f(); | ||
|
|
||
| /** | ||
| * The default constructor will set the location to calculate the | ||
| * distances from to {0, 0, 0}. | ||
| */ | ||
| /** | ||
| * The default constructor will set the location to calculate the | ||
| * distances from to {0, 0, 0}. | ||
| */ | ||
| public DistanceComparator() { | ||
| origin = new Vector3f(); | ||
| } | ||
|
|
||
| /** | ||
| * Creates this Distance comparator and sets the temp to the | ||
| * given parameter. | ||
| * The temp is used to calculate distances from. | ||
| * @param temp used to calculate distances from when comparing entities. | ||
| */ | ||
| /** | ||
| * Creates this Distance comparator and sets the temp to the | ||
| * given parameter. | ||
| * The temp is used to calculate distances from. | ||
| * | ||
| * @param origin used to calculate distances from when comparing entities. | ||
| */ | ||
| public DistanceComparator(Vector3f origin) { | ||
| this.origin = new Vector3f(origin); | ||
| } | ||
|
|
||
| @Override | ||
| public int compare(EntityRef o1, EntityRef o2) { | ||
| LocationComponent loc1 = o1.getComponent(LocationComponent.class); | ||
| LocationComponent loc2 = o2.getComponent(LocationComponent.class); | ||
| if (loc1 == null && loc2 == null) { | ||
| return 0; | ||
| } else if (loc1 == null) { | ||
| return 1; | ||
| } else if (loc2 == null) { | ||
| return -1; | ||
| } | ||
| loc1.getWorldPosition(temp); | ||
| temp.sub(origin); | ||
| float dis1 = temp.lengthSquared(); | ||
| loc2.getWorldPosition(temp); | ||
| temp.sub(origin); | ||
| float dis2 = temp.lengthSquared(); | ||
| if (dis1 < dis2) { | ||
| return -1; | ||
| } else if (dis2 < dis1) { | ||
| return 1; | ||
| } else { | ||
| //dis1 == dis2 | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Sets the origin, which is used to calculate the distance from. | ||
| * This method should not be called while sorting. If done anyway, the | ||
| * contract of compare method will be broken and the sorting results | ||
| * are undefined, if by chance no Exception is thrown. | ||
| * | ||
| * @param newOrigin the new location to calculate distances from. | ||
| */ | ||
| public void setOrigin(Tuple3f newOrigin) { | ||
| origin.set(newOrigin); | ||
| } | ||
|
|
||
| } |
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