Ciao Diego,
yeah, it's me again :-).
I am wondering about your goals....
Could you describe exaclty what you are trying to do in terms of
sources of data and suported features? I could try and give some
directions as well as sharing some code that I have that would be
really handy for you. It does make use of internal pyramids as well as
some good old copy area call.
Simone.
On Dec 12, 2007 1:05 PM, Diego Fdez. Durán <[EMAIL PROTECTED]> wrote:
> I've been reading the StreamingRenderer trying to understand how the
> layer's drawing process works.
>
> When the StreamingRenderer draws the layer[1] it uses the
> Graphics2D.drawImage method. Wouldn't be better to use the
> Graphics2D.drawRenderedImage to apply the transformation (and get better
> performance?).
>
> Who is the developer of StreamingRenderer?
>
> [1]
> -- start code StreamingRenderer code (line 1585)
>
> // graphics.setTransform( new AffineTransform() );
> for (int t = 0; t < n_lfts; t++) {
> if (fts_array[t].myImage != null) // this is the case for the
> // first one (ie.
> // fts_array[t].graphics ==
> // graphics)
> {
> graphics.drawImage(fts_array[t].myImage, 0, 0, null);
> fts_array[t].myImage.flush();
> fts_array[t].graphics.dispose();
> }
> }
>
> -- end code
>
>
>
> On mar, 2007-12-11 at 13:50 -0800, Jody Garnett wrote:
>
> > Okay; so JPanel does double buffering by default (so your paint method
> > is being passed a Graphics object that is backed onto a BuferedImage -
> > check it out in a debugger). Needless to say this is not what you want
> > for performance...
> >
> > Have a read of this:
> > - http://www.exampledepot.com/egs/java.awt.image/VolImage.html
> >
> > Now there is a good chance I am leading you down the garden path here;
> > performance tuning is a difficult balance. Please try rendering to a
> > VolatileImage and let it me know if it works in your situation. I know
> > it does wonders for doing the usual range of JAI activities; but
> > resampling down onto disk may stretch the limits.
> >
> > The source code for JAI is online; you may want to look exactly at what
> > DisplayJAI is doing.
> > Cheers,
> > Jody
> > > I append the full source code[1] but the painting part is:
> > >
> > > private class PanelMap extends JPanel {
> > >
> > > @Override
> > > public void paint(Graphics g) {
> > > try {
> > > Graphics2D g2d = (Graphics2D) g;
> > > Rectangle rectangle = new Rectangle(getSize());
> > >
> > > //System.out.println("Map size (px): "+ rectangle.height
> > > + "x" + rectangle.width);
> > >
> > > renderer.paint(g2d, rectangle,
> > > mapContext.getLayerBounds());
> > > } catch (IOException ex) {
> > >
> > > Logger.getLogger(PanelGeoMap.class.getName()).log(Level.SEVERE,
> > > null, ex);
> > > }
> > > }
> > > }
> > >
> > > I override the JPanel's paint method. PanelMap is inside a JScrollPane
> > > and the renderer, in theory, only have to draw the visible viewport.
> > >
> >
> --
>
> Diego Fdez. Durán <[EMAIL PROTECTED]> | http://www.goedi.net
> GPG : 925C 9A21 7A11 3B13 6E43 50DB F579 D119 90D2 66BB
>
>
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