Re: [Cdk-devel] changes in Render2DModel and/or Renderer2D

[Rajarshi G. <rx...@ps...>]

On Fri, 2006-04-28 at 11:53 -0400, Rajarshi Guha wrote:
> Hi, I just synced with the CDK repo and it appears that my draw2d code
> is not working.
> 
> More specifically, whatever image type is outputted (PNG, JPG, PDF) the
> resultant image is blank. Since the PDF output contains the molecule
> name etc, I'm thinking that it has something to do with get the image
> from the JPanel that the Renderer object is placed in.
> 
> Have there been any changes that would lead to this type of problem?

A little more investigation leads me to believe that I am having a
problem with rendering coordinates. I'm using the following code to
render a molecule into a JPanel:

            StructureDiagramGenerator sdg = new StructureDiagramGenerator();
            sdg.setMolecule((IMolecule)mol);
            sdg.generateCoordinates();
            this.mol = sdg.getMolecule();

            r2dm.setDrawNumbers(false);
            r2dm.setUseAntiAliasing(true);
            r2dm.setColorAtomsByType(false);
            r2dm.setShowImplicitHydrogens(false);
            r2dm.setShowAromaticity(true);
	    r2dm.setShowReactionBoxes(false);
	    r2dm.setKekuleStructure(false);

	    // r2dm is an instance of Renderer2DModel
            GeometryTools.translateAllPositive(this.mol, r2dm.getRenderingCoordinates());
            GeometryTools.scaleMolecule(this.mol, getPreferredSize(), this.scale);			
            GeometryTools.center(this.mol, getPreferredSize());

....

    public void paint(Graphics g)
    {
        super.paint(g);
        renderer.paintMolecule(this.mol, (Graphics2D)g, false, false);
    }

Then I go to save the resultant image:

                Image img = createImage(this.getSize().width, this.getSize().height);
                Graphics2D snapGraphics = (Graphics2D) img.getGraphics();
                this.paint(snapGraphics);
                RenderedOp image = JAI.create("AWTImage", img);
                JAI.create("filestore", image, filename, this.oformat);

By using r2dm.getRenderingCoordinates() I can see a few pixels in the lower left corner of
the final saved image which seems to indicate that I'm messing up with coordinates.
 
I recall a thread regarding rendering/world coordinates on the list.

Does anybody have any pointers as to how I can fix this?

-------------------------------------------------------------------
Rajarshi Guha <rx...@ps...> <http://jijo.cjb.net>
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
-------------------------------------------------------------------
Enzymes are things invented by biologists that explain things which
otherwise require harder thinking.
-- Jerome Lettvin