/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: SimpleGoalEightNeighbours.java
* Written by: Christian Harnisch, Ingo Besenfelder, Michael Neumann (Team 3)
*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.routing.experimentalAStar3.goal;
import com.sun.electric.tool.routing.experimentalAStar3.algorithm.AStarGoalBase;
import com.sun.electric.tool.routing.experimentalAStar3.algorithm.AStarNode;
import com.sun.electric.tool.routing.experimentalAStar3.algorithm.AStarOpenListBase;
/**
* Mostly the same as the SimpleGoal, but works with eight directions.
*
* @author Christian Harnisch
*
*/
public class SimpleGoalEightNeighbours implements AStarGoalBase<AStarNode>
{
private AStarOpenListBase<AStarNode> openList;
private AStarNode goalNode;
private int maxRevolutions = 0;
/*
* (non-Javadoc)
*
* @see algorithm.AStarGoalBase#setGoalTile(algorithm.Tile)
*/
public void setGoalNode(AStarNode goal)
{
this.goalNode = goal;
}
/*
* (non-Javadoc)
*
* @see algorithm.AStarGoalBase#distanceToGoal(algorithm.Tile)
*/
public int distanceToGoal(int startX, int startY, int startZ)
{
return distance(startX, startY, startZ, this.goalNode.getX(), this.goalNode.getY(), this.goalNode.getZ());
}
/*
* (non-Javadoc)
*
* @see algorithm.AStarGoalBase#getTileCost(algorithm.Tile, algorithm.Tile)
*/
public int getNodeCost(AStarNode node, int endX, int endY, int endZ)
{
// This simple implementation always returns the distance (so it's a cost of
// 1 per step).
return distance(node.getX(), node.getY(), node.getZ(), endX, endY, endZ);
}
/*
* (non-Javadoc)
*
* @see algorithm.AStarGoalBase#isPathFinished(algorithm.AStarNode)
*/
public boolean isPathFinished(AStarNode currentNode)
{
// Arrived at goal node
return goalNode.equals(currentNode);
}
/*
* (non-Javadoc)
*
* @see algorithm.AStarGoalBase#setNodeStorage(algorithm.AStarOpenListBase,
* algorithm.AStarClosedListBase)
*/
public void setNodeStorage(AStarOpenListBase<AStarNode> openList)
{
this.openList = openList;
}
/*
* (non-Javadoc)
*
* @see algorithm.AStarGoalBase#setMaxRevolutions(int)
*/
public void setMaximumRevolutions(int maximum)
{
maxRevolutions = maximum;
}
/*
* (non-Javadoc)
*
* @see algorithm.AStarGoalBase#shouldGiveUp(int)
*/
public boolean shouldGiveUp(int currentRevolutions)
{
// Maximum search time exceeded
if (maxRevolutions > 0 && currentRevolutions >= maxRevolutions)
return true;
// No more nodes to search, thus, no possible path exists.
if (openList.isOpenListEmpty())
return true;
return false;
}
// Diagonal wires allowed here, thus use Euclidean distance
private int distance(int startX, int startY, int startZ, int endX, int endY, int endZ)
{
int deltaX = startX - endX;
int deltaY = startY - endY;
return (int) (10 * Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2)));
}
}