WorldWind Java Layer Architecture and the Layer Stack

// Enable / disable rendering and picking for this layer
boolean isEnabled();
void setEnabled(boolean enabled);

// Human-readable name (used by LayerPanel and getLayerByName)
String getName();
void setName(String name);

// Opacity blending with underlying layers (0.0 = fully transparent, 1.0 = fully opaque)
double getOpacity();
void setOpacity(double opacity);

// Control whether this layer participates in pick passes
boolean isPickEnabled();
void setPickEnabled(boolean isPickable);

// Altitude-activation range — layer is only rendered within this altitude band
double getMinActiveAltitude();
void setMinActiveAltitude(double minActiveAltitude);
double getMaxActiveAltitude();
void setMaxActiveAltitude(double maxActiveAltitude);

// Network data retrieval (applies to tiled and WMS-backed layers)
boolean isNetworkRetrievalEnabled();
void setNetworkRetrievalEnabled(boolean networkRetrievalEnabled);

// Rendering and picking callbacks (called by SceneController each frame)
void preRender(DrawContext dc);
void render(DrawContext dc);
void pick(DrawContext dc, java.awt.Point pickPoint);

// Whether the most recent render used the highest-resolution data available
boolean isAtMaxResolution();
boolean isMultiResolution();

LayerList layers = wwd.getModel().getLayers();

// Add a layer to the top of the stack (rendered last / on top)
RenderableLayer myLayer = new RenderableLayer();
myLayer.setName("My Shapes");
layers.add(myLayer);

// Insert at a specific index (0 = bottom of stack)
layers.add(0, new StarsLayer());

// Remove by reference
layers.remove(myLayer);

// Remove by index
layers.remove(3);

// Look up a layer by name
Layer compass = layers.getLayerByName("Compass");

// Look up all layers of a given type
List<Layer> tiledLayers = layers.getLayersByClass(TiledImageLayer.class);

// Iterate all layers
for (Layer layer : layers) {
    System.out.println(layer.getName() + " opacity=" + layer.getOpacity());
}

// Insert just before the CompassLayer
ApplicationTemplate.insertBeforeCompass(wwd, myLayer);

// Insert just before the PlaceNameLayer (NASAWFSPlaceNameLayer)
ApplicationTemplate.insertBeforePlacenames(wwd, myLayer);

// Insert just after the PlaceNameLayer
ApplicationTemplate.insertAfterPlacenames(wwd, myLayer);

// Insert before a layer whose name contains a substring
ApplicationTemplate.insertBeforeLayerName(wwd, myLayer, "Landsat");

import gov.nasa.worldwind.geom.*;
import gov.nasa.worldwind.layers.RenderableLayer;
import gov.nasa.worldwind.render.*;

// Create the layer
RenderableLayer layer = new RenderableLayer();
layer.setName("Polygons");
layer.setOpacity(0.8);

// Create a surface polygon and add it to the layer
ShapeAttributes attrs = new BasicShapeAttributes();
attrs.setInteriorMaterial(Material.RED);
attrs.setInteriorOpacity(0.5);
attrs.setOutlineMaterial(Material.WHITE);

SurfacePolygon polygon = new SurfacePolygon(attrs);
polygon.addOuterBoundary(java.util.Arrays.asList(
    LatLon.fromDegrees(37.0, -122.0),
    LatLon.fromDegrees(37.0, -118.0),
    LatLon.fromDegrees(34.0, -118.0),
    LatLon.fromDegrees(34.0, -122.0)
));
layer.addRenderable(polygon);

// Add the layer above all existing layers
wwd.getModel().getLayers().add(layer);
wwd.redraw();

LayerList layers = wwd.getModel().getLayers();

// Disable the scalebar overlay
Layer scalebar = layers.getLayerByName("Scale bar");
if (scalebar != null) {
    scalebar.setEnabled(false);
}

// Toggle the star field
Layer stars = layers.getLayerByName("Stars");
if (stars != null) {
    stars.setEnabled(!stars.isEnabled());
    wwd.redraw();
}