/**
* Sets the display to paint selected features yellow and unselected features in the default
* style.
*
* @param IDs identifiers of currently selected features
*/
public void displaySelectedFeatures(Set<FeatureId> IDs) {
Style style;
if (IDs.isEmpty()) {
style = createDefaultStyle();
} else {
style = createSelectedStyle(IDs);
}
// mapFrame.getMapContext().getLayer(0).setStyle(style);
// 这里有点问题，需调整
mapFrame.getMapPane().repaint();
}
/**
* This method is called by our feature selection tool when the user has clicked on the map.
*
* @param pos map (world) coordinates of the mouse cursor
*/
void selectFeatures(MapMouseEvent ev) {
System.out.println("Mouse click at: " + ev.getMapPosition());
/*
* Construct a 5x5 pixel rectangle centred on the mouse click position
*/
Point screenPos = ev.getPoint();
Rectangle screenRect = new Rectangle(screenPos.x - 2, screenPos.y - 2, 5, 5);
/*
* 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 bbox =
new ReferencedEnvelope(
worldRect,
// mapFrame.getMapContext().getCoordinateReferenceSystem());
// 这里有点问题，需调整
mapFrame.getMapContent().getCoordinateReferenceSystem());
/*
* Create a Filter to select features that intersect with
* the bounding box
*/
Filter filter = ff.intersects(ff.property(geometryAttributeName), ff.literal(bbox));
// ff.bbox(ff.property(geometryAttributeName), bbox);
/*
* Use the filter to identify the selected features
*/
try {
FeatureCollection<SimpleFeatureType, SimpleFeature> selectedFeatures =
featureSource.getFeatures(filter);
FeatureIterator<SimpleFeature> 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());
}
} finally {
iter.close();
}
if (IDs.isEmpty()) {
System.out.println(" no feature selected");
}
displaySelectedFeatures(IDs);
} catch (Exception ex) {
ex.printStackTrace();
return;
}
}