Hi All,
I am working on a project where I have nautical charts displayed within a
MapContent object within a JMapFrame. Then I plot points onto that map,
each set of points within their own layer. I want to give the user the
ability to select individual points and groups of points either for deletion
or other purposes. In order to accomplish this, I create a listener for
mouse clicks (code below). When I click on any points that are on the map,
it appears as though the only feature I get is the Grid that is the raster
map itself. I don't ever find any of the points which are displaying. Does
anyone have an idea as to what I may be doing wrong here? Also, has anyone
had any experience with selecting many points by clicking/dragging to cover
many? I appreciate your time!
// Add a listener for mouse clicks on the map to select points
mapFrame.getMapPane().addMouseListener( new MapMouseAdapter() {
@Override
public void onMouseClicked(MapMouseEvent ev) {
// Get the world position of the mouse
//DirectPosition2D pos = ev.getMapPosition();
DirectPosition2D pos = ev.getWorldPos();
java.awt.Point screenPos = ev.getPoint();
// Not collecting WayPoints, select features based on click and
highlight them
Rectangle screenRect = new Rectangle(screenPos.x-1,
screenPos.y-1, 3, 3);
/*
* Transform the screen rectangle into bounding box in the
coordinate
* reference system of our map context. Note: we are using a
naive method
* here but GeoTools also offers other, more accurate methods.
*/
AffineTransform screenToWorld =
mapFrame.getMapPane().getScreenToWorldTransform();
Rectangle2D worldRect =
screenToWorld.createTransformedShape(screenRect).getBounds2D();
ReferencedEnvelope worldbbox = new ReferencedEnvelope(worldRect,
mapFrame.getMapContent().getCoordinateReferenceSystem());
mapFeatureSource = (SimpleFeatureSource)
rasterLayer.getFeatureSource();
// transform from world to target CRS
SimpleFeatureType schema = mapFeatureSource.getSchema();
CoordinateReferenceSystem targetCRS =
schema.getCoordinateReferenceSystem();
String geometryAttributeName =
schema.getGeometryDescriptor().getLocalName();
try {
ReferencedEnvelope bbox = worldbbox.transform(targetCRS,
true, 10);
/*
* Create a Filter to select features that intersect with
* the bounding box
*/
Filter filter = ff.bbox(ff.property(geometryAttributeName),
bbox);
//Filter filter =
ff.intersects(ff.property(geometryAttributeName), ff.literal(bbox));
/*
* Use the filter to identify the selected features
*/
SimpleFeatureCollection selectedFeatures =
mapFeatureSource.getFeatures(filter);
SimpleFeatureIterator iter = selectedFeatures.features();
Set<FeatureId> IDs = new HashSet<FeatureId>();
try {
while (iter.hasNext()) {
SimpleFeature feature = iter.next();
IDs.add(feature.getIdentifier());
System.out.println(" " +
feature.getIdentifier().getID() + "; Type: " + feature.getFeatureType());
}
} finally {
iter.close();
}
if (IDs.isEmpty()) {
System.out.println(" no feature selected");
}
} catch (Exception ex) {
ex.printStackTrace();
return;
}
System.out.println("Mouse Click latitude: " + pos.y);
System.out.println("Mouse Click longitude: " + pos.x);
}
} );
Thanks,
David
--------------------------------------------
David Purdy
Owner/President
JJM Technologies Corporation
Email: david.pu...@jjmtechcorp.com
Phone: 508.972.1266
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