/*

  * Copyright (c) 2005, the JUNG Project and the Regents of the University of

  * California All rights reserved.

  *

  * This software is open-source under the BSD license; see either "license.txt"

  * or http://jung.sourceforge.net/license.txt for a description.

  *

  * Created on Jul 21, 2005

  */

 package edu.uci.ics.jung.visualization.jai;

 import javax.media.jai.PerspectiveTransform;

 import edu.uci.ics.jung.algorithms.layout.GraphElementAccessor;

 import edu.uci.ics.jung.visualization.Layer;

 import edu.uci.ics.jung.visualization.RenderContext;

 import edu.uci.ics.jung.visualization.VisualizationViewer;

 import edu.uci.ics.jung.visualization.picking.ViewLensShapePickSupport;

 import edu.uci.ics.jung.visualization.renderers.BasicRenderer;

 import edu.uci.ics.jung.visualization.renderers.Renderer;

 import edu.uci.ics.jung.visualization.transform.shape.GraphicsDecorator;

 import edu.uci.ics.jung.visualization.transform.shape.TransformingGraphics;

 /**

  * A class to make it easy to add a Perspective projection

  * to a jung graph application. See PerspectiveTransformerDemo

  * for an example of how to use it.

  * 

  * @author Tom Nelson

  */

 public class PerspectiveImageLensSupport<V,E> extends AbstractPerspectiveTransformSupport<V,E> {

     protected RenderContext<V,E> renderContext;

     protected GraphicsDecorator lensGraphicsDecorator;

     protected GraphicsDecorator savedGraphicsDecorator;

     protected Renderer<V,E> renderer;

     protected Renderer<V,E> transformingRenderer;

         protected GraphElementAccessor<V,E> pickSupport;

     static final String instructions = "";

     /**

      * @param vv the VisualizationViewer to work on

      */

     public PerspectiveImageLensSupport(VisualizationViewer<V,E> vv) {

         super(vv);

         this.renderContext = vv.getRenderContext();

         this.pickSupport = renderContext.getPickSupport();

         this.renderer = vv.getRenderer();

         this.transformingRenderer = new BasicRenderer<V,E>();

         this.perspectiveTransformer = 

             new PerspectiveShapeTransformer(new PerspectiveTransform(), vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW));

         this.transformingRenderer.setVertexRenderer(new TransformingImageVertexIconRenderer<V,E>());

         this.lensGraphicsDecorator = new TransformingGraphics(perspectiveTransformer);

         this.savedGraphicsDecorator = renderContext.getGraphicsContext();

         this.renderer = vv.getRenderer();

     }

     public void activate() {

         lens = new Lens(perspectiveTransformer, vv.getSize());

         renderContext.setPickSupport(new ViewLensShapePickSupport<V,E>(vv));

         vv.getRenderContext().getMultiLayerTransformer().setTransformer(Layer.VIEW, perspectiveTransformer);

         vv.getRenderContext().setGraphicsContext(lensGraphicsDecorator);

         vv.setRenderer(transformingRenderer);

         vv.addPreRenderPaintable(lens);

         vv.setToolTipText(instructions);

         vv.repaint();

     }

     public void deactivate() {

             renderContext.setPickSupport(pickSupport);

         vv.getRenderContext().getMultiLayerTransformer().setTransformer(Layer.VIEW, perspectiveTransformer.getDelegate());

         vv.removePreRenderPaintable(lens);

         vv.getRenderContext().setGraphicsContext(savedGraphicsDecorator);

         vv.setRenderer(renderer);

         vv.setToolTipText(defaultToolTipText);

         vv.repaint();

     }

 }