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Posted to batik-users@xmlgraphics.apache.org by Ernst Müller <er...@gmx.net> on 2006/12/02 20:15:55 UTC

Problem with JSVGCanvas and setRenderingTransform

Hi

I'm new to batik and tried to do use the JSVGCanvas with an SVGGraphics2D object - that basically worked - but than I tried to scale it via an Affine Transformation ... that fails sometimes. It only fails when the area that I paint on with SVGGraphics is bigger than the JSVGCanvas size, but it does not always fail ... sometimes I just run it again it works ...

I am running a Linux (Gentoo) with a 1.5.0_09-b03 Java Version, developing in Eclipse 3.2 and using Batik 1.6.

Here is the sourcecode I use:

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JFrame frame = new JFrame("test");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(500, 500);
		JSVGCanvas canvas = new JSVGCanvas();
		frame.getContentPane().add(canvas);
		String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
		// Get a DOMImplementation
        DOMImplementation domImpl =
            GenericDOMImplementation.getDOMImplementation();

        // Create an instance of org.w3c.dom.Document
        Document document = domImpl.createDocument(svgNS, "svg", null);

        // Create an instance of the SVG Generator
        SVGGraphics2D g = new SVGGraphics2D(document);
        //some stupid drawings for testing
        g.setColor(Color.green);
        g.fillRect(0, 0, 1501, 1501);
        g.setColor(Color.black);
        g.drawRect(10, 10, 100, 100);        
        g.setColor(java.awt.Color.red);
        g.fillArc(20, 20, 50, 50, 0, 359);
        
        Element root = document.getDocumentElement();
        g.getRoot(root);
       
        canvas.setDocument(document);
        
        frame.setVisible(true);
        
        canvas.setRenderingTransform(AffineTransform.getScaleInstance(0.1, 0.1), true);
	}

Since I am new ... did I use the batik api wrong or is there somewhere a bug?

cu & thx
ernii
-- 
"Ein Herz für Kinder" - Ihre Spende hilft! Aktion: www.deutschlandsegelt.de
Unser Dankeschön: Ihr Name auf dem Segel der 1. deutschen America's Cup-Yacht!

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Re: Problem with JSVGCanvas and setRenderingTransform

Posted by th...@kodak.com.
Hi Ernst,

"Ernst Müller" <er...@gmx.net> wrote on 12/02/2006 02:15:55 PM:

> I'm new to batik and tried to do use the JSVGCanvas with an 
SVGGraphics2D 
> object - that basically worked - but than I tried to scale it via an 
Affine 
> Transformation ... that fails sometimes. It only fails when the area 
that I 
> paint on with SVGGraphics is bigger than the JSVGCanvas size, but it 
does not 
> always fail ... sometimes I just run it again it works ...

   The is because setDocument is asynchronous, since it can take
a long time for large documents.  Once the document is loaded the
canvas uses 'setRenderingTransform' to set the initial view,
if this happens before your call then your call 'wins', if
this happens after your call then your call 'loses'.

   Typically, you want to hold off manipulating the canvas until
after the document is fully rendered.  This can be detected by
registering a gvtRenderingTreeListener.

> I am running a Linux (Gentoo) with a 1.5.0_09-b03 Java Version, 
developing in 
> Eclipse 3.2 and using Batik 1.6.
> 
> Here is the sourcecode I use:
> 
>    public static void main(String[] args) {
>       // TODO Auto-generated method stub
>       JFrame frame = new JFrame("test");
>       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>       frame.setSize(500, 500);
>       JSVGCanvas canvas = new JSVGCanvas();
>       frame.getContentPane().add(canvas);
>       String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
>       // Get a DOMImplementation
>         DOMImplementation domImpl =
>             GenericDOMImplementation.getDOMImplementation();
> 
>         // Create an instance of org.w3c.dom.Document
>         Document document = domImpl.createDocument(svgNS, "svg", null);
> 
>         // Create an instance of the SVG Generator
>         SVGGraphics2D g = new SVGGraphics2D(document);
>         //some stupid drawings for testing
>         g.setColor(Color.green);
>         g.fillRect(0, 0, 1501, 1501);
>         g.setColor(Color.black);
>         g.drawRect(10, 10, 100, 100); 
>         g.setColor(java.awt.Color.red);
>         g.fillArc(20, 20, 50, 50, 0, 359);
> 
>         Element root = document.getDocumentElement();
>         g.getRoot(root);
> 
>         canvas.setDocument(document);
> 
>         frame.setVisible(true);
> 
> canvas.setRenderingTransform(AffineTransform.getScaleInstance(0.1, 0.1), 
true);
>    }
> 
> Since I am new ... did I use the batik api wrong or is there somewhere a 
bug?
> 
> cu & thx
> ernii
> -- 
> "Ein Herz für Kinder" - Ihre Spende hilft! Aktion: 
www.deutschlandsegelt.de
> Unser Dankeschön: Ihr Name auf dem Segel der 1. deutschen America's 
Cup-Yacht!
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
> For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org
> 


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