org.opennms.features.topology.app.internal.jung.AbstractLayoutAlgorithm.java Source code

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Here is the source code for org.opennms.features.topology.app.internal.jung.AbstractLayoutAlgorithm.java

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/*******************************************************************************
 * This file is part of OpenNMS(R).
 *
 * Copyright (C) 2012-2014 The OpenNMS Group, Inc.
 * OpenNMS(R) is Copyright (C) 1999-2014 The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 *
 * OpenNMS(R) 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with OpenNMS(R).  If not, see:
 *      http://www.gnu.org/licenses/
 *
 * For more information contact:
 *     OpenNMS(R) Licensing <license@opennms.org>
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package org.opennms.features.topology.app.internal.jung;

import java.awt.Dimension;
import java.awt.Point;
import java.awt.geom.Point2D;

import org.apache.commons.collections15.Transformer;
import org.opennms.features.topology.api.GraphContainer;
import org.opennms.features.topology.api.Layout;
import org.opennms.features.topology.api.LayoutAlgorithm;
import org.opennms.features.topology.api.topo.VertexRef;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class AbstractLayoutAlgorithm implements LayoutAlgorithm, LayoutConstants {

    private static final Logger LOG = LoggerFactory.getLogger(AbstractLayoutAlgorithm.class);

    @Override
    public abstract void updateLayout(GraphContainer graph);

    protected static Dimension selectLayoutSize(GraphContainer g) {
        int vertexCount = g.getGraph().getDisplayVertices().size();

        double height = 1.5 * Math.sqrt(vertexCount) * ELBOW_ROOM;
        double width = height * 16.0 / 9.0;

        Dimension dim = new Dimension((int) width, (int) height);

        LOG.debug("selectLayoutSize: vertexCount={}, returm dim={}", vertexCount, dim);

        return dim;
    }

    protected static Transformer<VertexRef, Point2D> initializer(final Layout graphLayout) {
        return new Transformer<VertexRef, Point2D>() {
            @Override
            public Point2D transform(VertexRef v) {
                if (v == null) {
                    LOG.warn("Algorithm tried to layout a null vertex");
                    return new Point(0, 0);
                }
                org.opennms.features.topology.api.Point location = graphLayout.getLocation(v);
                return new Point2D.Double(location.getX(), location.getY());
            }
        };
    }

    protected static Transformer<VertexRef, Point2D> initializer(final Layout graphLayout, final int xOffset,
            final int yOffset) {
        return new Transformer<VertexRef, Point2D>() {
            @Override
            public Point2D transform(VertexRef v) {
                org.opennms.features.topology.api.Point location = graphLayout.getLocation(v);
                return new Point2D.Double(location.getX() - xOffset, location.getY() - yOffset);
            }
        };
    }

}