org.jgrapht.alg.drawing.model.MapLayoutModel2D Maven / Gradle / Ivy
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/*
* (C) Copyright 2018-2023, by Dimitrios Michail and Contributors.
*
* JGraphT : a free Java graph-theory library
*
* See the CONTRIBUTORS.md file distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the
* GNU Lesser General Public License v2.1 or later
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
*
* SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
*/
package org.jgrapht.alg.drawing.model;
import java.util.*;
import java.util.Map.*;
/**
* A layout model which uses a hashtable to store the vertices' locations.
*
* @author Dimitrios Michail
*
* @param the vertex type
*/
public class MapLayoutModel2D
implements LayoutModel2D
{
protected Box2D drawableArea;
protected Map points;
protected Set fixed;
/**
* Create a new model.
*
* @param drawableArea the drawable area
*/
public MapLayoutModel2D(Box2D drawableArea)
{
this.drawableArea = drawableArea;
this.points = new LinkedHashMap<>();
this.fixed = new HashSet<>();
}
@Override
public Box2D getDrawableArea()
{
return drawableArea;
}
@Override
public void setDrawableArea(Box2D drawableArea)
{
this.drawableArea = drawableArea;
}
@Override
public Iterator> iterator()
{
return points.entrySet().iterator();
}
@Override
public Point2D get(V vertex)
{
return points.get(vertex);
}
@Override
public Point2D put(V vertex, Point2D point)
{
boolean isFixed = fixed.contains(vertex);
if (!isFixed) {
return points.put(vertex, point);
}
return points.putIfAbsent(vertex, point);
}
@Override
public void setFixed(V vertex, boolean fixed)
{
if (fixed) {
this.fixed.add(vertex);
} else {
this.fixed.remove(vertex);
}
}
@Override
public boolean isFixed(V vertex)
{
return fixed.contains(vertex);
}
}