Why this code does not create a point layer in GeoTools

Question

I am testing adding a point set to a map using the Geotools API. I followed this example as far as I could The problem of creating a point and adding it to FeatureCollection , as the example code is old, and things like FeatureCollections are out of date. Instead, I tried to use an instance of DefaultFeatureCollection, and I'm not sure if I use it correctly, and therefore the points do not appear on the map. What am I doing wrong? Here is my code:

private void plotMarkers() { final SimpleFeatureType TYPE = this.createFeatureType(); final SimpleFeatureBuilder BLDR = new SimpleFeatureBuilder(TYPE); DefaultFeatureCollection features = new DefaultFeatureCollection(); // arbitrary start position Coordinate pos = new Coordinate(0, 0); final double pointSpacing = 1.0; String title = "Test"; features.add(creatureFeature(BLDR, pos, title)); // display points on screen Style style = SLD.createPointStyle("circle", Color.RED, Color.RED, 1.0f, 5.0f); Layer layer = new FeatureLayer(features, style); this.getMapContent().addLayer(layer); } 

Answer 1

Perhaps this will help you do this.

 private MapContent map; private static Style pointStyle = SLD.createPointStyle("Circle", Color.RED, Color.RED, 0.5f, POINT_SIZE); public static void CreatePoints(double X, double Y){ createPointLayer(); createFeatures(X,Y); } static void createFeatures(double X, double Y) { Point point = geometryFactory.createPoint(new Coordinate(X, Y)); pointCollection.add(SimpleFeatureBuilder.build(pointType, new Object[]{point}, null)); //create map layer event MapLayerEvent mple = new MapLayerEvent(pointLayer, MapLayerEvent.DATA_CHANGED); //create maplayer list event MapLayerListEvent mplle = new MapLayerListEvent(map, pointLayer, map.layers().indexOf(pointLayer), mple); okvir.mapPane.layerChanged(mplle); System.out.println(MessageFormat.format("Created Point: {0}", point)); } private static void createPointLayer() { if (pointType == null) { pointFeatureTypeBuilder.setName("PointCreated"); pointFeatureTypeBuilder.setCRS(map.getCoordinateReferenceSystem()); pointFeatureTypeBuilder.add("the_geom", Point.class); pointType = pointFeatureTypeBuilder.buildFeatureType(); pointCollection = new DefaultFeatureCollection(null, pointType); } pointLayer = new FeatureLayer(pointCollection, pointStyle); map.addLayer(pointLayer); }