Examples of diva.canvas.GraphicsPane

diva.canvas.GraphicsPane
A CanvasPane which has a default set of layers that are useful for interactive drawing and editing applications. The layers are organized as follows:
```
 (front)  Foreground event Overlay Foreground graphics Background graphics Background event 
```
This organization allows applications to easily overlay and underlay graphics and event handling around the main application window.
Typical uses of each of these layers include:

Foreground event layer

Grid or object snapping, stroke filtering, event monitoring and debugging, event grab, etc. By default, this layer is not enabled. If you enable it, but still want events to go through to the underlying figure layers, use setConsuming(false).
Overlay

An overlay layer for drag-selection outlining and so on. By default, this layer is an instance of OverlayLayer and is set visible.
Foreground graphics

The main application graphics. By default, this layer is an instance of FigureLayer and is set enabled and visible.
Background graphics
Auxiliary, non-interactive graphics. By default, this layer is an instance of FigureLayer but is set not visible and not enabled..
Background Event

"Last chance" event handling layer, for things such as drag-selection rectangle, panning/zooming, etc. By default, this layer is enabled. @author Michael Shilman @author John Reekie @version $Id: GraphicsPane.java,v 1.17 2006/08/21 23:09:20 cxh Exp $ @Pt.AcceptedRating Yellow

        // FindBugs suggests making this class static so as to decrease
        // the size of instances and avoid dangling references.


        public Figure createFigure() {
            Figure bg = new BasicRectangle(10, 10, 20, 20, Color.blue);
            CanvasPane pane = new GraphicsPane();
            pane.setSize(300.0, 300.0);


            PaneWrapper wrapper = new PaneWrapper(pane);
            wrapper.setBackground(bg);
            return wrapper;
        }

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        // Lastly drop the canvas in the frame.
        if (_canvas != null) {
            _container.remove(_canvas);
        }


        GraphicsPane pane = new GraphicsPane();
        _layer = pane.getForegroundLayer();
        _overlayLayer = new OverlayLayer();


        _canvas = new JCanvas(pane);


        _container.add("Center", _canvas);
        _canvas.setMinimumSize(new Dimension(horizontalDimension,
                verticalDimension));
        _canvas.setMaximumSize(new Dimension(horizontalDimension,
                verticalDimension));
        _canvas.setPreferredSize(new Dimension(horizontalDimension,
                verticalDimension));


        if (_frame != null) {
            _frame.pack();
        }


        double upperLeftXValue = ((IntToken) upperLeftX.getToken())
                .doubleValue();
        double upperLeftYValue = ((IntToken) upperLeftY.getToken())
                .doubleValue();
        double lowerRightXValue = ((IntToken) lowerRightX.getToken())
                .doubleValue();
        double lowerRightYValue = ((IntToken) lowerRightY.getToken())
                .doubleValue();
        java.awt.geom.Rectangle2D visibleRect = new java.awt.geom.Rectangle2D.Double(
                upperLeftXValue, upperLeftYValue, lowerRightXValue
                        - upperLeftXValue, lowerRightYValue - upperLeftYValue);


        if ((visibleRect.getHeight() == 0) || (visibleRect.getWidth() == 0)) {
            throw new IllegalActionException(this, "The width and height "
                    + "of the visible rectangle cannot be zero.");
        }


        AffineTransform transform = CanvasUtilities.computeTransform(
                visibleRect, _canvas.getBounds());
        System.out.println("transform = " + transform);


        //       _origin = new Point2D.Double(
        //                 _container.getWidth()/2, _container.getHeight()/2);
        //         pane.translate(_origin.x, _origin.y);
        pane.setTransform(transform);
        pane.setAntialiasing(true);


        _crosshairX = new BasicFigure(new java.awt.geom.Line2D.Double(0, 2, 0,
                -2));
        _crosshairY = new BasicFigure(new java.awt.geom.Line2D.Double(2, 0, -2,
                0));
        _overlayLayer.add(_crosshairX.getShape());
        _overlayLayer.add(_crosshairY.getShape());


        _eventHandler = new ViewScreen2DListener();
        _eventLayer = new EventLayer();
        _eventLayer.addLayerListener(_eventHandler);
        _eventLayer.addLayerMotionListener(_eventHandler);


        pane.setOverlayLayer(_overlayLayer);
        pane.setForegroundEventLayer(_eventLayer);


        if (_frame != null) {
            _frame.addKeyListener(_eventHandler);
        }

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        mbandDiagText = new LabelFigure(" ");
        mbandDiagText.setFillPaint(Color.blue);
        mbandDiagText.setFont(font);
        mband.add(mbandDiagText);


        GraphicsPane gpane = (GraphicsPane) imageDisplay.getCanvasPane();
        setFigureLayer(gpane.getForegroundLayer());
        setEventLayer(gpane.getBackgroundEventLayer());


        // Bind to mouse button 3 (and 2, in case there are only 2 buttons)
        dragFilter = new MouseFilter(InputEvent.BUTTON3_MASK | InputEvent.BUTTON2_MASK, 0, 0);
    }

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    /**
     * Default constructor. Note that you need to call setParentFrame() if you use this version).
     */
    public DivaMainImageDisplay() {
        this(new GraphicsPane());
    }

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     *
     * @param imageProcessor Object managing the image
     * @param name name to associate with this instance
     */
    public DivaGraphicsImageDisplay(ImageProcessor imageProcessor, String name) {
        this(new GraphicsPane(), imageProcessor, name);
    }

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