/*

  * Copyright (c) 2003, 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.

  * 

  */

 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.Renderer;

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

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

 /**

  * Creates a PerspectiveShapeTransformer to use in the view

  * transform. This one will distort Vertex shapes.

  * 

  * @author Tom Nelson

  *

  *

  */

 public class PerspectiveViewTransformSupport<V,E> extends AbstractPerspectiveTransformSupport<V,E>

     implements PerspectiveTransformSupport {

         protected RenderContext<V,E> renderContext;

     protected Renderer<V,E> renderer;

     protected GraphicsDecorator lensGraphicsDecorator;

     protected GraphicsDecorator savedGraphicsDecorator;

     protected GraphElementAccessor<V,E> pickSupport;

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

         super(vv);

         this.renderer = vv.getRenderer();

         this.renderContext = vv.getRenderContext();

         this.pickSupport = renderContext.getPickSupport();

         this.perspectiveTransformer = 

             new PerspectiveShapeTransformer(new PerspectiveTransform(), 

                             vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW));

         this.savedGraphicsDecorator = renderContext.getGraphicsContext();

         this.lensGraphicsDecorator = new TransformingGraphics(perspectiveTransformer);

     }

     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.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.setToolTipText(defaultToolTipText);

         vv.repaint();

     }

 }