/*******************************************************************************
* Copyright 2014 Rafael Garcia Moreno.
*
* 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.bladecoder.engine.polygonalpathfinder;
import com.bladecoder.engine.pathfinder.AStarPathFinder.AStarHeuristicCalculator;
import com.bladecoder.engine.pathfinder.NavContext;
/**
* Implementation of a heuristic calculator for a polygonal map. It simply calculates the distance between two points.
*
* @author rgarcia
*/
public class Distance implements AStarHeuristicCalculator<NavNodePolygonal> {
@Override
public float getCost (NavContext<NavNodePolygonal> map, Object mover, NavNodePolygonal startNode, NavNodePolygonal targetNode) {
float sx = startNode.getX();
float sy = startNode.getY();
float tx = targetNode.getX();
float ty = targetNode.getY();
float a = sx - tx;
float b = sy - ty;
return (float)Math.sqrt(a * a + b * b);
}
}