Box2dRadiusProximity.java

/*******************************************************************************
 * Copyright 2014 davebaol https://github.com/davebaol
 * 
 * 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 com.devcharles.piazzapanic.utility.box2d;

 import com.badlogic.gdx.ai.steer.Proximity;
 import com.badlogic.gdx.ai.steer.Steerable;
 import com.badlogic.gdx.math.Vector2;
 import com.badlogic.gdx.physics.box2d.Fixture;
 import com.badlogic.gdx.physics.box2d.World;
 
 /** A {@code Box2dRadiusProximity} is a {@link Proximity} that queries the world for all fixtures that potentially overlap the
  * circle having the specified detection radius and whose center is the owner position.
  * 
  * @author davebaol */
 public class Box2dRadiusProximity extends Box2dSquareAABBProximity {
 
     public Box2dRadiusProximity (Steerable<Vector2> owner, World world, float detectionRadius) {
         super(owner, world, detectionRadius);
     }
 
     @SuppressWarnings("unchecked")
     protected Steerable<Vector2> getSteerable (Fixture fixture) {
         return (Steerable<Vector2>)fixture.getBody().getUserData();
     }
 
     @Override
     protected boolean accept (Steerable<Vector2> steerable) {
         // The bounding radius of the current body is taken into account
         // by adding it to the radius proximity
         float range = detectionRadius + steerable.getBoundingRadius();
 
         // Make sure the current body is within the range.
         // Notice we're working in distance-squared space to avoid square root.
         float distanceSquare = steerable.getPosition().dst2(owner.getPosition());
 
         return distanceSquare <= range * range;
     }
 
 }