de.openali.odysseus.chart.ext.base.layer.HoverIndex.java Source code

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Here is the source code for de.openali.odysseus.chart.ext.base.layer.HoverIndex.java

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/*----------------    FILE HEADER KALYPSO ------------------------------------------
 *
 *  This file is part of kalypso.
 *  Copyright (C) 2004 by:
 *
 *  Technical University Hamburg-Harburg (TUHH)
 *  Institute of River and coastal engineering
 *  Denickestrae 22
 *  21073 Hamburg, Germany
 *  http://www.tuhh.de/wb
 *
 *  and
 *
 *  Bjoernsen Consulting Engineers (BCE)
 *  Maria Trost 3
 *  56070 Koblenz, Germany
 *  http://www.bjoernsen.de
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact:
 *
 *  E-Mail:
 *  belger@bjoernsen.de
 *  schlienger@bjoernsen.de
 *  v.doemming@tuhh.de
 *
 *  ---------------------------------------------------------------------------*/
package de.openali.odysseus.chart.ext.base.layer;

import gnu.trove.TIntProcedure;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.tuple.Pair;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.kalypso.jts.JTSUtilities;

import com.infomatiq.jsi.SpatialIndex;
import com.infomatiq.jsi.rtree.RTree;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Polygon;

import de.openali.odysseus.chart.framework.model.layer.EditInfo;

/**
 * @author Gernot Belger
 */
public class HoverIndex {
    private final SpatialIndex m_index = new RTree();

    private final List<Pair<Polygon, EditInfo>> m_elements = new ArrayList<>();

    private GeometryFactory m_factory;

    public HoverIndex() {
        m_index.init(null);
    }

    public synchronized void addElement(final Rectangle rect, final EditInfo info) {
        final Envelope envelope = new Envelope(rect.x, rect.x + rect.width, rect.y, rect.y + rect.height);

        final Polygon bounds = JTSUtilities.convertEnvelopeToPolygon(envelope, getFactory());

        addElement(bounds, info);
    }

    private GeometryFactory getFactory() {
        if (m_factory == null)
            m_factory = new GeometryFactory();

        return m_factory;
    }

    public synchronized void addElement(final Polygon bounds, final EditInfo info) {
        final int id = m_elements.size();

        m_elements.add(Pair.of(bounds, info));

        final Envelope envelope = bounds.getEnvelopeInternal();

        final com.infomatiq.jsi.Rectangle jsiRect = JTSUtilities.toRectangle(envelope);
        m_index.add(jsiRect, id);
    }

    public synchronized EditInfo findElement(final Point pos) {
        final com.infomatiq.jsi.Point searchPoint = new com.infomatiq.jsi.Point(pos.x, pos.y);

        final List<Pair<Polygon, EditInfo>> result = new ArrayList<>(1);
        result.add(null);

        final List<Pair<Polygon, EditInfo>> elements = m_elements;

        final TIntProcedure receiver = new TIntProcedure() {
            @Override
            public boolean execute(final int index) {
                final Pair<Polygon, EditInfo> element = elements.get(index);
                result.set(0, element);
                return false;
            }
        };

        // REMARK: use snap distance 0, we assume that the given rectangle was already including a 'snap'
        m_index.nearest(searchPoint, receiver, 0f);

        final Pair<Polygon, EditInfo> pair = result.get(0);
        if (pair == null)
            return null;

        final Polygon bounds = pair.getLeft();
        final com.vividsolutions.jts.geom.Point searchLocation = bounds.getFactory()
                .createPoint(new Coordinate(pos.x, pos.y));
        if (bounds.distance(searchLocation) > 1)
            return null;

        /* Exact position was not set during creation of info..., so we set it now */
        final EditInfo info = pair.getRight();

        return new EditInfo(info.getLayer(), info.getHoverFigure(), info.getEditFigure(), info.getData(),
                info.getText(), pos);
    }
}