nl.cloudfarming.client.geoviewer.jxmap.map.PolygonDrawingContext Maven / Gradle / Ivy

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AgroSense geoviewer JXMap implementation. Contains a map/geoviewer TopComponent based on the JXMap classes from swingx.
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/**
 * Copyright (C) 2008-2012 AgroSense Foundation.
 *
 * AgroSense 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.
 *
 * There are special exceptions to the terms and conditions of the GPLv3 as it is applied to
 * this software, see the FLOSS License Exception
 * .
 *
 * AgroSense 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 AgroSense.  If not, see .
 */
package nl.cloudfarming.client.geoviewer.jxmap.map;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.CoordinateSequence;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.Polygon;
import com.vividsolutions.jts.geom.impl.CoordinateArraySequence;
import nl.cloudfarming.client.geoviewer.SingleObjectLayer;
import nl.cloudfarming.client.geoviewer.render.DrawingRenderer;
import nl.cloudfarming.client.geoviewer.render.PolygonDrawingRenderer;
import org.jdesktop.swingx.JXMapViewer;
import org.openide.util.NbBundle;

/**
 * Drawing context for polygons
 * @author johan
 */
@NbBundle.Messages({"# {0} - name of the object being edited", "PolygonDrawingContext.description=creating geometry for {0}"})
class PolygonDrawingContext extends AbstractLineDrawingContext {
    private SingleObjectLayer layer;

    public PolygonDrawingContext(SingleObjectLayer layer, JXMapViewer mapViewer) {
        super(layer, mapViewer);
        this.layer = layer;
    }

    @Override
    public boolean canStart() {
        // no input geometry to validate, we can always start creating a new one:
        return true;
    }
    
    @Override
    public boolean canFinish() {
        // are there enough points to create a polygon?
        if (coords.size()  < 3) {
            return false;
        }
        // check if closing the currently drawn line produces a valid ring:
        return makeRing().isValid();    
    }
    
    /**
     * Create a ring form the currently drawn line by adding a 
     * segment from the last to the first point.
     * 
     * @return 
     */
    private LinearRing makeRing() {
        int len = coords.size() + 1;
        Coordinate[] coordArray = coords.toArray(new Coordinate[len]);
        coordArray[len - 1] = coordArray[0]; // close the ring
        CoordinateSequence coordSequence = new CoordinateArraySequence(coordArray);
        return new LinearRing(coordSequence, geometryFactory);
    }
    
    @Override
    public boolean finish() {
        LinearRing ring = makeRing();
        if (ring.isValid()) {
            // create the polygon
            Polygon polygon = new Polygon(ring, null, geometryFactory);
            layer.setGeometry(polygon);
            // TODO:  save (cookie is in node lookup via dataobject)
            cleanup();
            return true;
        }
        return false;
    }
    
    @Override
    public DrawingRenderer getRenderer() {
        return new PolygonDrawingRenderer(coords);
    }

    @Override
    public String getDescription() {
        return Bundle.PolygonDrawingContext_description(layer.getName());
    }
    
}