RE: Select an element and draw it on the canvas without updating the svg

Hi JavaNoob,

javaNoob <noypi_baller@xxxxxxxxx> wrote on 07/13/2008
03:36:03 AM:

> i tried what thomas suggested and it worked but its still cpu intensive..
how
> can i make dragging an element more efficient? i read that i can use
> overlays but when i looked at the cpu usage, its almost the same as
updating
> the dom... any suggestions? 

   For very simple document's the update
overhead will be similar.
However the overlay approach shouldn't get slower
even for very
complex SVG documents.

   If you need to drag complex pieces of
the SVG document you 
should render them to an offscreen buffer yourself
and drag that 
(like Batik does with the main document).

   Also it's easy for you do be doing something
that might cause
Batik to rerender the document as well so you might
check carefully
for that.

> thomas.deweese wrote:
> > 
> > Hi Michael, JavaNoob,
> > 
> > "Bishop, Michael W. CONTR J9C880" <Michael.Bishop@xxxxxxxxxxxx>
wrote on 
> > 07/07/2008 10:21:41 AM:
> > 
> >> In your Overlay's paint method, clear the rectangle first.
> >> 
> >> g2d.clearRect(0, 0, width, height);
> > 
> >    This might work but it might also simply erase the
> > entire canvas.  I would suggest changing to:
> > 
> >> >     @Override
> >> >     public void mouseDragged(MouseEvent e)
{
> >> >         x = e.getX();
> >> >         y = e.getY();
> >> >         JGVTComponent c = (JGVTComponent)
e.getSource();
> >               c.immediateRepaint();
> >> >     }
> > 
> >    This will trigger the overlay to be painted.
> > 
> > 
> 
> -- 
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> element-and-draw-it-on-the-canvas-without-updating-the-svg-
> tp18189565p18426935.html
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> 
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