Re: [JAVA3D] selection with mouse

[Mr H. Morgan]

Hi Nagehan,

>I want to select the shapes in my scene with the mouse, like that folders
>are selected by operating systems. Press the button of the mouse and drag
>it, select the shapes in the region whose bounds was drawing by mouse. Who
>can help me?

This is just what I have been doing.  You need the Drag and Drop API in
AWT, and the picking API in Java 3D.  For the Drag and Drop API, I used
the example code at
http://developer.java.sun.com/developer/qow/archive/1/index.html.  I
extend Canvas3D to implement DragSourceListener, DragGestureListener
and DropTargetListener.  To do the picking I use something like
following code (in DragableCanvas3D) -

public void dragGestureRecognized(DragGestureEvent e)
{
    branchGroup = window.pickGraphic(this, e.getDragOrigin());
    TransferableGraphic graphic = makeTransferable(branchGroup);
    if(graphic.getSceneRoot() != null)
    {
        dragSource.startDrag(e, DragSource.DefaultMoveDrop, graphic, this);
    }
}

And then in the window that holds the DragableCanvas3D -

Note - scenes is a vector of nodes that are parents of the parts of the
scene group that must be 'Drag and Drop'able.  You must do
sceneGroup.setCapability(Node.ENABLE_PICK_REPORTING) on each.

public BranchGroup doPicking(Canvas3D pickFromCanvas, Point pickLocation)
{
    PickCanvas pickCanvas = new PickCanvas(pickFromCanvas,
                                           universe.getLocale());
    pickCanvas.setMode(PickTool.GEOMETRY_INTERSECT_INFO);
    pickCanvas.setTolerance(5.0f);
    pickCanvas.setShapeLocation(pickLocation.x, pickLocation.y);

    PickResult pickResult = pickCanvas.pickClosest();

    BranchGroup returnGroup = null;
    if (pickResult != null)
    {
        SceneGraphPath path = pickResult.getSceneGraphPath();

        int pathLimit = path.nodeCount();
        int scenesLimit = scenes.size();

        Node node;
        for(int i = 0; ((i < pathLimit) && (returnGroup == null)); ++i)
        {
            node = path.getNode(i);
            for(int j = 0;
                ((j < scenesLimit) && (returnGroup == null));
                ++j)
            {
                if(node.equals(scenes.elementAt(j)))
                {
                    returnGroup = (BranchGroup) scenes.elementAt(j);
                }
            }
        }
    }
    return returnGroup;
}

I hope this helps.  Let me know on or off list if you want any more of
the code or other help.

Good luck,

Hugh

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