/* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2004, Refractions Research Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
*/
package org.locationtech.udig.tutorials.examples;
import org.locationtech.udig.project.ILayer;
import org.locationtech.udig.project.ui.render.displayAdapter.MapMouseEvent;
import org.locationtech.udig.project.ui.tool.SimpleTool;
import org.locationtech.udig.ui.ProgressManager;
import org.geotools.data.FeatureSource;
import org.geotools.feature.FeatureCollection;
import org.opengis.referencing.operation.MathTransform;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
/**
* This example is a tool that does a "Pick" from a click on the ViewportPane. It retrieves all the features
* intersecting the pick from the currently selected layer.
*
* An example of the xml in the plugin.xml might be:
*
* <pre>
* < extension
* point="org.locationtech.udig.project.ui.tool" >
* < modalTool
* class="org.locationtech.udig.code.examples.PickTool"
* id="org.locationtech.udig.code.examples.pick"
* name="Pick Features"
* onToolbar="true"
* tooltip="Pick Features" />
* </ extension>
*
* </pre>
* @author Jesse
* @since 1.1.0
*/
public class PickTool extends SimpleTool{
@Override
protected void onMouseReleased( MapMouseEvent e ) {
try{
// convert the mouse click into map coordinates. This is the
// CRS obtained from the ViewportModel
Coordinate world = getContext().pixelToWorld(e.x, e.y);
// now we must transform the coordinate to the CRS of the layer
ILayer layer = getContext().getSelectedLayer();
MathTransform tranform = layer.mapToLayerTransform();
double[] from=new double[]{world.x, world.y};
double[] to = new double[2];
tranform.transform(from, 0, to, 0, 1);
// Construct a envelope from the transformed coordinate
Envelope env = new Envelope(new Coordinate(to[0],to[1]));
// Query the feature source to get the features that intersect with that coordinate
FeatureSource source = layer.getResource(FeatureSource.class, ProgressManager.instance().get());
FeatureCollection features = source.getFeatures(layer.createBBoxFilter(env, ProgressManager.instance().get()));
// do something with the features...
}catch( Throwable t ){
// do something smart, notify user probably.
}
}
}