Examples of diva.canvas.CanvasComponent

diva.canvas.CanvasComponent
A CanvasComponent is an object that can be inserted into the display tree of a JCanvas. The tree is rooted by an instance of CanvasPane, then consists of CanvasLayers, Figures, and other kinds of recursively-structured CanvasComponents. @version $Id: CanvasComponent.java,v 1.9 2005/07/08 19:54:44 cxh Exp $ @author John Reekie @Pt.AcceptedRating Yellow

     */
    public void clearEdge(Object edge) {
        Figure f = _controller.getFigure(edge);


        if (f != null) {
            CanvasComponent container = f.getParent();
            f.setUserObject(null);
            _controller.setFigure(edge, null);


            if (container instanceof FigureLayer) {
                ((FigureLayer) container).remove(f);

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        }


        Figure f = _controller.getFigure(node);


        if (f != null) {
            CanvasComponent container = f.getParent();
            f.setUserObject(null);
            _controller.setFigure(node, null);


            // If the figure is decorated, then we have to undecorate
            // it before proceeding, or the figure remains as a ghost!
            while (container instanceof FigureDecorator) {
                FigureDecorator decorator = (FigureDecorator) container;
                container = container.getParent();
                ((FigureContainer) container).undecorate(decorator);
            }


            if (container instanceof FigureLayer) {
                ((FigureLayer) container).remove(f);

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            // so we have to use a lower level mechanism.
            double halo = layer.getPickHalo();
            double width = halo * 2;
            Rectangle2D region = new Rectangle2D.Double(transformedPoint.getX()
                    - halo, transformedPoint.getY() - halo, width, width);
            CanvasComponent figureUnderMouse = layer.pick(region);


            // Find a user object belonging to the figure under the mouse
            // or to any figure containing it (it may be a composite figure).
            Object objectUnderMouse = null;


            while (figureUnderMouse instanceof UserObjectContainer
                    && (objectUnderMouse == null)) {
                objectUnderMouse = ((UserObjectContainer) figureUnderMouse)
                        .getUserObject();


                if (objectUnderMouse instanceof NamedObj) {
                    if (figureUnderMouse instanceof Figure) {
                        return (Figure) figureUnderMouse;
                    }
                }


                figureUnderMouse = figureUnderMouse.getParent();
            }


            return null;
        }

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            // This is an absurdly convoluted way to get the info we need.
            // But there seems to be no other way.
            // This is an architectural flaw in vergil.
            GraphPane pane = ((JGraph) source).getGraphPane();
            FigureLayer layer = pane.getForegroundLayer();
            CanvasComponent currentFigure = layer.getCurrentFigure();
            GraphController controller = pane.getGraphController();
            GraphModel model = controller.getGraphModel();


            if (currentFigure != null) {
                _target = null;


                while ((_target == null) && (currentFigure != null)) {
                    Object object = currentFigure;


                    if (object instanceof Figure) {
                        object = ((Figure) currentFigure).getUserObject();
                    }


                    _target = (NamedObj) model.getSemanticObject(object);
                    currentFigure = currentFigure.getParent();
                }


                // NOTE: _target may end up null here!
                if (_target == null) {
                    throw new InternalErrorException(

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Related Classes of diva.canvas.CanvasComponent

diva.graph.BasicEdgeController

diva.graph.BasicNodeController

ptolemy.vergil.basic.EditorDropTarget$DTListener

ptolemy.vergil.toolbox.FigureAction

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