get Graphics instance

[Curtis Rueden]

Hi Celine,

> Is it possible to get an instance of the current Graphics to be able to draw
> String instead of using ScalarMap and References. I'd like to to the same
> thing as the drawCursorStringVector methid from DisplayRendererJ2D.

Sorry for the delay in my response; I have been traveling these past few days.

It should be possible to get a handle on a Java2D display's Graphics2D
somehow, though I haven't explored it. For Java3D displays, however,
that's not how things work.

However, in VisBio, I use a technique to display text to a Display
without using a screen locked renderer or other method involving
ScalarMaps and DataReferences. Essentially, you can do it with
DataRenderer's setException method. Here is a boiled down version:

    DisplayImpl d = ...; // VisAD display
    DataRenderer rend = ...; // linked data renderer
    String[] messages = ...; // list of messages

    // set exception messages
    rend.clearExceptions();
    for (int i=0; i<messages.length; i++) {
      rend.addException(new VisADException(messages[i]));
    }

    // force redraw of exception messages
    // BE SURE TO DO THIS IN AWT EVENT THREAD
    DisplayRenderer dr = d.getDisplayRenderer();
    if (dr instanceof DisplayRendererJ2D) {
      ((DisplayRendererJ2D) dr).getCanvas().repaint();
    }
    else { // renderer instanceof DisplayRendererJ3D
      DisplayRendererJ3D dr3d = (DisplayRendererJ3D) dr;
      dr3d.getCanvas().renderField(0);
    }

-Curtis

On 3/28/07, Celine Gestas <celine.gestas at gmail.com> wrote:
> Hi,
>
> Is it possible to get an instance of the current Graphics to be able to draw
> String instead of using ScalarMap and References. I'd like to to the same
> thing as the drawCursorStringVector methid from DisplayRendererJ2D.
>
> Cheers,
>
> Celine Gestas
>

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