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Java Source Code / Java Documentation » GIS » udig 1.1 » net.refractions.udig.project.internal.render

Source Cross Reference Class Diagram Java Document (Java Doc)

net.refractions.udig.project.internal.render .MultiLayerRenderer

All known Subclasses:   net.refractions.udig.project.internal.render.impl .CompositeRendererImpl,  net.refractions.udig.project.internal.render.impl .MultiLayerRendererImpl,
MultiLayerRenderer
public interface MultiLayerRenderer extends Renderer,IMultiLayerRenderer(Code)
The CompositeRenderer is a container for all the Renderers of a viewport.
Produces a Image out of a series of renderers, provides viewport pane notification when content changes.

Renderer must ensure that the layers are combined in the correct zorder. The largest zorder must be drawn first.

Combines all outputs from contained renderers into a buffered image

Image creation is provided by RenderContext

Double Buffering is handled by someone else (viewport pane)

CompositeRenderer must register with its contained renderers so it can merge the rendered layers again.

The events the render stack must listen for are setState(DONE) events. The following code illustrates how this can be done:
executor.eAdapters().add(new RenderListenerAdapter(){ //renderDone is called when setState(DONE) is called protected void renderDone() { synchronized (CompositeRendererImpl.this) { setState(DONE); } } });

Call setState(RENDERING) when a redraw is required.

The Default implementation simply draws the layers overtop one another to merge the Layers. CompositeRenderer

author:
   jeichar

Field Summary
String copyright


Method Summary
void refreshImage()
     Called when the map has changed.
this method is guaranteed not to block

Usually the image will merge the images for each layer.

Field Detail
copyright
String copyright(Code)

Method Detail
refreshImage
void refreshImage() throws RenderException(Code)
Called when the map has changed.
this method is guaranteed not to block

Usually the image will merge the images for each layer. However in some cases, such as for a WMS, the image will have to be recreated. This should be a quick operation.

Note: This command differs from render. render() forces a full rerendering of the data whereas refreshImage does not require that the renderer access the data again.
throws:
  RenderException -

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