org.geotools.map

Class DirectLayer

Object

Layer

DirectLayer

Direct Known Subclasses:

MessageDirectLayer

public abstract class DirectLayer
extends Layer

A Layer directly responsible for its own rendering.

Direct layers are responsible for their own rendering and are useful for:

• Map Decorations such as legends or scalebars that depend only on the map and viewport and do not actually make use of external data.
• Data services that are visual in nature, such as a Web Map Service (which you can think of as an external renderer)
• You may also consider data formats, such as CAD files, where the style information is "baked into" the data format as suitable for a DirectLayer. In these cases you are only going for a visual display and are not making the raw features available to the geotools library for use.

While any and all data sources could be wrapped up as a DirectLayer we encourage you to consider a separate data mode, style model and renderer.

Since:

2.7

Author:

Jody

Field Summary

Fields inherited from class Layer

listenerList, LOGGER, selected, title, userData, visible

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DirectLayer()

Method Summary

Modifier and Type	Method and Description
abstract void	draw(Graphics2D graphics, MapContent map, MapViewport viewport) Draw layer contents onto screen

Methods inherited from class Layer

addMapLayerListener, connectDataListener, dispose, finalize, fireMapLayerListenerLayerChanged, fireMapLayerListenerLayerDeselected, fireMapLayerListenerLayerHidden, fireMapLayerListenerLayerPreDispose, fireMapLayerListenerLayerSelected, fireMapLayerListenerLayerShown, getBounds, getFeatureSource, getQuery, getStyle, getTitle, getUserData, isSelected, isVisible, preDispose, removeMapLayerListener, setSelected, setTitle, setVisible, toString

Methods inherited from class Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DirectLayer

protected DirectLayer()

Method Detail

draw

public abstract void draw(Graphics2D graphics,
                          MapContent map,
                          MapViewport viewport)

Draw layer contents onto screen

Parameters:

map - Map being drawn; check map bounds and crs

graphics - Graphics to draw into

viewport - Area to draw the map into; including screen area