Application: gvSIG desktop

package org.gvsig.selectiontools.app.extension.tools;

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 * 

 * This program 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 2

 * of the License, or (at your option) any later version.

 * 

 * This program 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 this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 

 * MA  02110-1301, USA.

 * 

 */

import java.awt.Cursor;

import java.awt.Image;

import java.awt.Toolkit;

import java.awt.event.MouseEvent;

import javax.swing.ImageIcon;

import org.gvsig.andami.IconThemeHelper;

import org.gvsig.andami.PluginServices;

import org.gvsig.andami.messages.NotificationManager;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.FeatureSelection;

import org.gvsig.fmap.dal.feature.FeatureSet;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.Geometry.SUBTYPES;

import org.gvsig.fmap.geom.Geometry.TYPES;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException;

import org.gvsig.fmap.geom.primitive.Point;

import org.gvsig.fmap.geom.primitive.Circle;

import org.gvsig.fmap.geom.primitive.GeneralPathX;

import org.gvsig.fmap.mapcontext.layers.FLayer;

import org.gvsig.fmap.mapcontext.layers.vectorial.FLyrVect;

import org.gvsig.fmap.mapcontrol.MapControl;

import org.gvsig.fmap.mapcontrol.tools.BehaviorException;

import org.gvsig.fmap.mapcontrol.tools.Events.MeasureEvent;

import org.gvsig.fmap.mapcontrol.tools.Listeners.CircleListener;

/**

 * <p>

 * Listener that selects all features of the active, available and vector layers

 * which intersect with the defined circle area in the associated

 * {@link MapControl MapControl} object.

 * </p>

 * 

 * @author Pablo Piqueras Bartolom? (pablo.piqueras@iver.es)

 */

public class CircleSelectionListener implements CircleListener {

    /**

     * The image to display when the cursor is active.

     */

//    private final Image img = new ImageIcon(this.getClass()

//        .getClassLoader()

//        .getResource("images/circle-cursor-icon.png")).getImage();

    /**

     * The cursor used to work with this tool listener.

     * 

     * @see #getCursor()

     */

    private Cursor cur = null ; 

    /**

     * Reference to the <code>MapControl</code> object that uses.

     */

    private MapControl mapCtrl;

    /**

     * <p>

     * Creates a new listener for selecting circular areas.

     * </p>

     * 

     * @param mc

     *            the <code>MapControl</code> object where the measures are made

     */

    public CircleSelectionListener(MapControl mc) {

        this.mapCtrl = mc;

    }

    /*

     * (non-Javadoc)

     * 

     * @see

     * com.iver.cit.gvsig.fmap.tools.Listeners.CircleListener#circle(com.iver

     * .cit.gvsig.fmap.tools.Events.MeasureEvent)

     */

    public void circle(MeasureEvent event) throws BehaviorException {

        if (event.getEvent().getID() == MouseEvent.MOUSE_RELEASED) {

            FLayer[] activeLayers =

                mapCtrl.getMapContext().getLayers().getActives();

            FLayer layer;

            FLyrVect lyrVect;

            Geometry geom = null;

            GeometryManager manager = GeometryLocator.getGeometryManager();

            Point center;

            try {

                center = (Point)manager.create(TYPES.POINT, SUBTYPES.GEOM2D);

                center.setX(event.getXs()[0].doubleValue());

                center.setY(event.getYs()[0].intValue());

                Point point2;

                point2 = (Point)manager.create(TYPES.POINT, SUBTYPES.GEOM2D);

                point2.setX(event.getXs()[1].doubleValue());

                point2.setY(event.getYs()[1].intValue());

                double radious = center.distance(point2);

                Circle circle = null;

                circle = (Circle) manager.create(TYPES.CIRCLE, SUBTYPES.GEOM2D);

                circle.setPoints(center, radious);

                geom = circle;

            } catch (CreateGeometryException e) {

                NotificationManager.showMessageError(PluginServices.getText(null,

                "Failed_creating_geometry"),

                e);

            } catch (GeometryOperationNotSupportedException e) {

                NotificationManager.showMessageError(PluginServices.getText(null,

                "Operation_not_supported"),

                e);

            } catch (GeometryOperationException e) {

                NotificationManager.showMessageError(PluginServices.getText(null,

                "Failed_performing_the_operation"),

                e);

            }

            if (geom == null)

                return;

            double flatness;

            // Creates the geometry

            // If the scale is < 500 -> approximates the circle with a polyline

            // with more points, as many as

            // smaller would be the scale

            if (mapCtrl.getMapContext().getScaleView() < 500) {

                GeneralPathX gP = new GeneralPathX();

                flatness = manager.getFlatness(); // ?????

                flatness =

                    mapCtrl.getMapContext().getScaleView() * flatness

                    / (500 * 2); // The number 2 forces to create the double

                // of points

                gP.append(geom.getPathIterator(null, flatness), true);

                try {

                    geom = manager.createSurface(gP, SUBTYPES.GEOM2D);

                } catch (CreateGeometryException e) {

                    NotificationManager.showMessageError(PluginServices.getText(null,

                    "Failed_creating_geometry"),

                    e);

                }

            } else {

                // Bigger scale -> Smaller flatness

                GeneralPathX gP = new GeneralPathX();

                flatness = manager.getFlatness(); // ?????

                flatness =

                    flatness / (mapCtrl.getMapContext().getScaleView() * 2);

                // *2 to reduce the number of lines of the polygon

                gP.append(geom.getPathIterator(null, flatness), true);

                try {

                    geom = manager.createSurface(gP, SUBTYPES.GEOM2D);

                } catch (CreateGeometryException e) {

                    NotificationManager.showMessageError(PluginServices.getText(null,

                    "Failed_creating_geometry"),

                    e);

                }

            }

            for (int i = 0; i < activeLayers.length; i++) {

                layer = activeLayers[i];

                if ((layer.isAvailable()) && (layer instanceof FLyrVect)) {

                    lyrVect = (FLyrVect) layer;

                    FeatureSet newSelection = null;

                    try {

                        newSelection =

                            lyrVect.queryByGeometry(geom,

                                lyrVect.getFeatureStore()

                                .getDefaultFeatureType());

                        if (event.getEvent().isControlDown()) {

                            ((FeatureSelection) lyrVect.getDataStore()

                                .getSelection()).select(newSelection);

                        } else {

                            lyrVect.getFeatureStore()

                            .setSelection(newSelection);

                        }

                    } catch (DataException e) {

                        NotificationManager.showMessageError(PluginServices.getText(null,

                            "Failed_selecting_geometries"),

                            e);

                    } finally {

                        newSelection.dispose();

                    }

                }

            }

        }

    }

    /*

     * (non-Javadoc)

     * 

     * @see com.iver.cit.gvsig.fmap.tools.Listeners.ToolListener#getCursor()

     */

        public Cursor getCursor() {

                if (cur == null) {

                        cur = Toolkit.getDefaultToolkit().createCustomCursor(

                                        this.getImageCursor(), new java.awt.Point(16, 16), "");

                }

                return cur;

        }

    /*

     * (non-Javadoc)

     * 

     * @see com.iver.cit.gvsig.fmap.tools.Listeners.ToolListener#cancelDrawing()

     */

    public boolean cancelDrawing() {

        return false;

    }

    public Image getImageCursor() {

        return IconThemeHelper.getImage("cursor-select-by-circle");

    }

}