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  How to draw directly to Canvas3D  (Read 1473 times)
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Offline chumDS

Senior Newbie

« Posted 2007-04-28 20:34:35 »

I want to draw text to my screen, AFTER the rendering is done.

I see that Canvas3D inherits from awt.Canvas, so I thought maybe I'd override paint(), postRender() or postSwap(), but none of those seemed to do what I want.

"Back in the day", when I was using JOGL, I'd complete my render, then go into glOrtho2D mode, then draw text onto the screen there, then do my GL-swap.  I'm ok with doing that in J3D, except I don't know how to interrupt the pipeline to do that.

Or I can just draw on the cavas, if there's a way to do that.

What I was trying that didn't work:

   public   void   paint (Graphics gr)
      super.paint (gr);

      gr.setColor (Color.white);
      gr.drawString ("Foo", 50, 50);

(Tried similar things with postRender() & postSwap(), too -- except I had to call getGraphics().)

No text shows up on my screen.

Help?  Hints?  Snippets?


Now, with even MORE Java!
Offline chumDS

Senior Newbie

« Reply #1 - Posted 2007-04-28 21:29:57 »

To follow up, I found A way (Google!), but it's sub-optimal.  Basically, I've got:

(My canvas class...)
   private      J3DGraphics2D   j3dgr   = null;

   public   void   postRender ()
//*      super.postRender ();

    private void drawText()
      if (j3dgr == null)
         j3dgr = getGraphics2D();

      j3dgr.drawString ("foo", 10, 10);
      j3dgr.flush (true);

Which works display-wise, but completely destroys my frame-rate.  (The slow part seems to be the flush().)

So my new & improved question is: how do I do this in a reasonable amount of time?

Now, with even MORE Java!
Offline Herkules

Senior Devvie

Friendly fire isn't friendly!

« Reply #2 - Posted 2007-05-08 07:56:40 »

I don't have a good answer. Just that creating 2D overlays with Java3D is difficult. The postRender approach is know to destroy performance. So the only way seems to be to do the 2D stuff in 3D as well.

HARDCODE    --     DRTS/FlyingGuns/JPilot/JXInput  --    skype me: joerg.plewe
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