batik JSVGCanvas won't display

Baron, Randy {PRG~Basel} Tue, 26 Nov 2002 09:25:50 -0800

Hi,

I’ve run into a kind of batik morass and thought maybe someone might be able to suggest a way out.

I’m not totally sure how to describe the problem , but here goes.

(batik-1.5beta4b, Java 1.4)

I have two Java Jframes that display two separate JSVGCanvas’s that result from calls to two separate classes. Each JSVGCanvas displays properly when I try to display them using a test class that has one frame and one svg canvas

I try to display the two canvas’s like this (just an exerpt of what I thought was relevant):

SVGSpliceVariantImp svgSpliceVariant = new SVGSpliceVariantImp(testdata);

theCanvas = svgSpliceVariant.getmRNADisplay();

frame.getContentPane().add(theCanvas);

frame.pack();

frame.setSize(1000, 800);

frame.setVisible(true);

SVGDNAImp svgDNA = new SVGDNAImp();

theCanvas2 = svgDNA.getDNADisplay();

frame2.getContentPane().add(theCanvas2);

frame2.pack();

frame2.setSize(1000, 800);

frame2.setVisible(true);

but get an error like this:

java.lang.NullPointerException

at org.apache.batik.bridge.CSSUtilities.getComputedStyle(Unknown Source)

at org.apache.batik.bridge.CSSUtilities.convertDisplay(Unknown Source)

at org.apache.batik.bridge.AbstractGraphicsNodeBridge.getDisplay(Unknown Source)

at org.apache.batik.bridge.GVTBuilder.build(Unknown Source)

at gui.genOrgaSVG.SVGDNAImp.svg_addLineInfo(SVGDNAImp.java:268)

at gui.genOrgaSVG.SVGDNAImp.dna2SVG(SVGDNAImp.java:177)

at gui.genOrgaSVG.SVGDNAImp.<init>(SVGDNAImp.java:100)

at gui.genOrgaSVG.GenOrgaSVGTestBoth.main(GenOrgaSVGTestBoth.java:102)

Exception in thread "main"

The source that corresponds to this error comes from this method:

public Element svg_HiLightSeqSeg(String anId, Element aTextElement, long startHiLight, long endHiLight, String hiLightColor, int offset) {

String elementText = aTextElement.getFirstChild().getNodeValue();

log.debug(" the element's text: " + elementText);

int textLength = elementText.length();

// Given the Element representing the current line of sequence, find it's x0,y0 and height & width using GVT methods.

Element overlayRect = doc.createElementNS(svgNS, "rect");

GVTBuilder builder = new GVTBuilder();

BridgeContext ctx = new BridgeContext(new UserAgentAdapter());

GraphicsNode aTextElementNode = builder.build(ctx, aTextElement);

double width = aTextElementNode.getBounds().getWidth();

double height = aTextElementNode.getBounds().getHeight();

double x = aTextElementNode.getBounds().getX();

double y = aTextElementNode.getBounds().getMinY();

(…code continues)

I thought of and tried to test for various things like maybe there wasn’t a big enough Frame or JSVGCanvas or something funny was happening with the timing of the JSVGCanvas creation, but haven’t had an luck. I suspect it has something to do with the BridgeContext or maybe UserAgent, but don’t really know.

Any ideas would be appreciated.

sincerely,

Randy Baron

batik JSVGCanvas won't display

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