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Posted to batik-users@xmlgraphics.apache.org by Qian Li <qi...@googlemail.com> on 2007/12/13 15:32:35 UTC
How to get SVGOMTextElement text length?
Hi,
I have a SVGOMTextElement, I want to know how to get the text length.
I have tried both getBBox() and getComputedTextLength(), they both
have null values. Would anyone please tell me if I should set anything
before using these methods?
Thanks very much.
Qian
Here is my code:
-----------------------------------------------------
SVGOMTextElement basicText = new SVGOMTextElement(null, svgDocument );
basicText.setTextContent(text);
System.out.println("[SVGText::setText] BBox ="+basicText.getBBox());
System.out.println("[SVGText::setText] text
length="+basicText.getComputedTextLength());
------------------------------------------------------
Here is the exceptions
------------------------------------------------------
[SVGText::setText] BBox =null
null
java.lang.NullPointerException
at org.apache.batik.dom.svg.SVGTextContentSupport.getComputedTextLength(SVGTextContentSupport.java:240)
at org.apache.batik.dom.svg.SVGOMTextContentElement.getComputedTextLength(SVGOMTextContentElement.java:186)
at com.gulfstream.software.constable.graphics.SVGText.setText(SVGText.java:112)
at com.gulfstream.software.constable.graphics.SVGText.<init>(SVGText.java:52)
at com.gulfstream.software.harris.plugins.AdditionPlugin.renderSVG(AdditionPlugin.java:88)
at com.gulfstream.software.constable.ide.MondrianSVGCanvas.drop(MondrianSVGCanvas.java:264)
at java.awt.dnd.DropTarget.drop(DropTarget.java:430)
at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:500)
at sun.awt.X11.XDropTargetContextPeer.processDropMessage(XDropTargetContextPeer.java:165)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:812)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:736)
at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:30)
at java.awt.Component.dispatchEventImpl(Component.java:4267)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:4057)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3911)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
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Re: How to get SVGOMTextElement text length?
Posted by th...@kodak.com.
Hi Qian,
"Qian Li" <qi...@googlemail.com> wrote on 12/21/2007 09:36:02 AM:
> (SVGOMTextElement) basicText = (SVGOMTextElement)
> jSVGCanvas.getSVGDocument().createElementNS(svgNS,
> SVGConstants.SVG_TEXT_TAG);
>
> Do you think it's correct?
You don't append 'basicText' to the document. So
it won't have a bbox. Also...
> However getBBox method still give me null.
> I think I didn't boot the CSS and SVG DOM correctly. Would you please
> explain more or give me some more completed sample code of booting the
> CSS and SVG DOM's.
Well the code appears to be trying to have the canvas
boot the CSS and SVG DOM. If you want to do that you need
to wait until the canvas was done booting the CSS and SVG DOM's,
since it is asynchronous. So you would need to attach a listener
for the onload event, and query the bbox in the callback.
Unless you really want to display the text in the canvas
you are much better off following the link I provided and
using that synchronous code to boot the SVG/CSS DOM for you.
> On Dec 19, 2007 10:50 AM, <th...@kodak.com> wrote:
> >
> > Hi Qian,
> >
> > "Qian Li" <qi...@googlemail.com> wrote on 12/13/2007 09:32:35 AM:
> >
> >
> > > I have a SVGOMTextElement, I want to know how to get the text
length.
> > > I have tried both getBBox() and getComputedTextLength(), they both
> > > have null values. Would anyone please tell me if I should set
anything
> > > before using these methods?
> >
> > You can't get information on text element's like this
> > independent of a document. So you should use the
> > batik.dom.svg.SVGDOMImplementation to create your Document.
> > Then use that document to create your text elements
> > (createElementNS). You must append the text elements to
> > the document (appendChild).
> >
> > Then before calling getBBox you must boot the CSS and SVG
> > DOM's:
> > http://wiki.apache.org/xmlgraphics-batik/BootSvgAndCssDom
> >
> >
> > >
> > > Thanks very much.
> > > Qian
> > >
> > > Here is my code:
> > > -----------------------------------------------------
> > > SVGOMTextElement basicText = new SVGOMTextElement(null, svgDocument
);
> > > basicText.setTextContent(text);
> > >
> > > System.out.println("[SVGText::setText] BBox
="+basicText.getBBox());
> > > System.out.println("[SVGText::setText] text
> > > length="+basicText.getComputedTextLength());
> > > ------------------------------------------------------
> > >
> > > Here is the exceptions
> > > ------------------------------------------------------
> > > [SVGText::setText] BBox =null
> > > null
> > > java.lang.NullPointerException
> > > at org.apache.batik.dom.svg.SVGTextContentSupport.
> > > getComputedTextLength(SVGTextContentSupport.java:240)
> > > at org.apache.batik.dom.svg.SVGOMTextContentElement.
> > > getComputedTextLength(SVGOMTextContentElement.java:186)
> > > at com.gulfstream.software.constable.graphics.SVGText.
> > > setText(SVGText.java:112)
> > > at com.gulfstream.software.constable.graphics.SVGText.
> > > <init>(SVGText.java:52)
> > > at com.gulfstream.software.harris.plugins.AdditionPlugin.
> > > renderSVG(AdditionPlugin.java:88)
> > > at com.gulfstream.software.constable.ide.MondrianSVGCanvas.
> > > drop(MondrianSVGCanvas.java:264)
> > > at java.awt.dnd.DropTarget.drop(DropTarget.java:430)
> > > at sun.awt.dnd.SunDropTargetContextPeer.
> > > processDropMessage(SunDropTargetContextPeer.java:500)
> > > at sun.awt.X11.XDropTargetContextPeer.
> > > processDropMessage(XDropTargetContextPeer.java:165)
> > > at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.
> > > dispatchDropEvent(SunDropTargetContextPeer.java:812)
> > > at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.
> > > dispatchEvent(SunDropTargetContextPeer.java:736)
> > > at
> > sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:30)
> > > at
java.awt.Component.dispatchEventImpl(Component.java:4267)
> > > at
java.awt.Container.dispatchEventImpl(Container.java:2116)
> > > at java.awt.Component.dispatchEvent(Component.java:4240)
> > > at java.awt.LightweightDispatcher.
> > > retargetMouseEvent(Container.java:4322)
> > > at java.awt.LightweightDispatcher.
> > > processDropTargetEvent(Container.java:4057)
> > > at
> > java.awt.LightweightDispatcher.dispatchEvent(Container.java:3911)
> > > at
java.awt.Container.dispatchEventImpl(Container.java:2102)
> > > at java.awt.Window.dispatchEventImpl(Window.java:2429)
> > > at java.awt.Component.dispatchEvent(Component.java:4240)
> > > at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
> > > at java.awt.EventDispatchThread.
> > > pumpOneEventForFilters(EventDispatchThread.java:273)
> > > at java.awt.EventDispatchThread.
> > > pumpEventsForFilter(EventDispatchThread.java:183)
> > > at java.awt.EventDispatchThread.
> > > pumpEventsForHierarchy(EventDispatchThread.java:173)
> > > at java.awt.EventDispatchThread.
> > > pumpEvents(EventDispatchThread.java:168)
> > > at java.awt.EventDispatchThread.
> > > pumpEvents(EventDispatchThread.java:160)
> > > at
java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
> > >
> > >
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> > > For additional commands, e-mail:
batik-users-help@xmlgraphics.apache.org
> > >
> >
>
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>
Re: How to get SVGOMTextElement text length?
Posted by Qian Li <qi...@googlemail.com>.
Hi Thomas,
Thank you very much for your reply. Currently I created the
SVGOMTextElement in the following way:
DOMImplementation impl = SVGDOMImplementation.getDOMImplementation();
String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
Document doc = impl.createDocument(svgNS, SVGConstants.SVG_SVG_TAG, null);
jSVGCanvas.setDocument(doc);
(SVGOMTextElement) basicText = (SVGOMTextElement)
jSVGCanvas.getSVGDocument().createElementNS(svgNS,
SVGConstants.SVG_TEXT_TAG);
Do you think it's correct? However getBBox method still give me null.
I think I didn't boot the CSS and SVG DOM correctly. Would you please
explain more or give me some more completed sample code of booting the
CSS and SVG DOM's.
Thank you very much for your help.
Kind regards
Qian
On Dec 19, 2007 10:50 AM, <th...@kodak.com> wrote:
>
> Hi Qian,
>
> "Qian Li" <qi...@googlemail.com> wrote on 12/13/2007 09:32:35 AM:
>
>
> > I have a SVGOMTextElement, I want to know how to get the text length.
> > I have tried both getBBox() and getComputedTextLength(), they both
> > have null values. Would anyone please tell me if I should set anything
> > before using these methods?
>
> You can't get information on text element's like this
> independent of a document. So you should use the
> batik.dom.svg.SVGDOMImplementation to create your Document.
> Then use that document to create your text elements
> (createElementNS). You must append the text elements to
> the document (appendChild).
>
> Then before calling getBBox you must boot the CSS and SVG
> DOM's:
> http://wiki.apache.org/xmlgraphics-batik/BootSvgAndCssDom
>
>
> >
> > Thanks very much.
> > Qian
> >
> > Here is my code:
> > -----------------------------------------------------
> > SVGOMTextElement basicText = new SVGOMTextElement(null, svgDocument );
> > basicText.setTextContent(text);
> >
> > System.out.println("[SVGText::setText] BBox ="+basicText.getBBox());
> > System.out.println("[SVGText::setText] text
> > length="+basicText.getComputedTextLength());
> > ------------------------------------------------------
> >
> > Here is the exceptions
> > ------------------------------------------------------
> > [SVGText::setText] BBox =null
> > null
> > java.lang.NullPointerException
> > at org.apache.batik.dom.svg.SVGTextContentSupport.
> > getComputedTextLength(SVGTextContentSupport.java:240)
> > at org.apache.batik.dom.svg.SVGOMTextContentElement.
> > getComputedTextLength(SVGOMTextContentElement.java:186)
> > at com.gulfstream.software.constable.graphics.SVGText.
> > setText(SVGText.java:112)
> > at com.gulfstream.software.constable.graphics.SVGText.
> > <init>(SVGText.java:52)
> > at com.gulfstream.software.harris.plugins.AdditionPlugin.
> > renderSVG(AdditionPlugin.java:88)
> > at com.gulfstream.software.constable.ide.MondrianSVGCanvas.
> > drop(MondrianSVGCanvas.java:264)
> > at java.awt.dnd.DropTarget.drop(DropTarget.java:430)
> > at sun.awt.dnd.SunDropTargetContextPeer.
> > processDropMessage(SunDropTargetContextPeer.java:500)
> > at sun.awt.X11.XDropTargetContextPeer.
> > processDropMessage(XDropTargetContextPeer.java:165)
> > at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.
> > dispatchDropEvent(SunDropTargetContextPeer.java:812)
> > at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.
> > dispatchEvent(SunDropTargetContextPeer.java:736)
> > at
> sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:30)
> > at java.awt.Component.dispatchEventImpl(Component.java:4267)
> > at java.awt.Container.dispatchEventImpl(Container.java:2116)
> > at java.awt.Component.dispatchEvent(Component.java:4240)
> > at java.awt.LightweightDispatcher.
> > retargetMouseEvent(Container.java:4322)
> > at java.awt.LightweightDispatcher.
> > processDropTargetEvent(Container.java:4057)
> > at
> java.awt.LightweightDispatcher.dispatchEvent(Container.java:3911)
> > at java.awt.Container.dispatchEventImpl(Container.java:2102)
> > at java.awt.Window.dispatchEventImpl(Window.java:2429)
> > at java.awt.Component.dispatchEvent(Component.java:4240)
> > at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
> > at java.awt.EventDispatchThread.
> > pumpOneEventForFilters(EventDispatchThread.java:273)
> > at java.awt.EventDispatchThread.
> > pumpEventsForFilter(EventDispatchThread.java:183)
> > at java.awt.EventDispatchThread.
> > pumpEventsForHierarchy(EventDispatchThread.java:173)
> > at java.awt.EventDispatchThread.
> > pumpEvents(EventDispatchThread.java:168)
> > at java.awt.EventDispatchThread.
> > pumpEvents(EventDispatchThread.java:160)
> > at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
> >
> > ---------------------------------------------------------------------
> > 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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Re: How to get SVGOMTextElement text length?
Posted by th...@kodak.com.
Hi Qian,
"Qian Li" <qi...@googlemail.com> wrote on 12/13/2007 09:32:35 AM:
> I have a SVGOMTextElement, I want to know how to get the text length.
> I have tried both getBBox() and getComputedTextLength(), they both
> have null values. Would anyone please tell me if I should set anything
> before using these methods?
You can't get information on text element's like this
independent of a document. So you should use the
batik.dom.svg.SVGDOMImplementation to create your Document.
Then use that document to create your text elements
(createElementNS). You must append the text elements to
the document (appendChild).
Then before calling getBBox you must boot the CSS and SVG
DOM's:
http://wiki.apache.org/xmlgraphics-batik/BootSvgAndCssDom
>
> Thanks very much.
> Qian
>
> Here is my code:
> -----------------------------------------------------
> SVGOMTextElement basicText = new SVGOMTextElement(null, svgDocument );
> basicText.setTextContent(text);
>
> System.out.println("[SVGText::setText] BBox ="+basicText.getBBox());
> System.out.println("[SVGText::setText] text
> length="+basicText.getComputedTextLength());
> ------------------------------------------------------
>
> Here is the exceptions
> ------------------------------------------------------
> [SVGText::setText] BBox =null
> null
> java.lang.NullPointerException
> at org.apache.batik.dom.svg.SVGTextContentSupport.
> getComputedTextLength(SVGTextContentSupport.java:240)
> at org.apache.batik.dom.svg.SVGOMTextContentElement.
> getComputedTextLength(SVGOMTextContentElement.java:186)
> at com.gulfstream.software.constable.graphics.SVGText.
> setText(SVGText.java:112)
> at com.gulfstream.software.constable.graphics.SVGText.
> <init>(SVGText.java:52)
> at com.gulfstream.software.harris.plugins.AdditionPlugin.
> renderSVG(AdditionPlugin.java:88)
> at com.gulfstream.software.constable.ide.MondrianSVGCanvas.
> drop(MondrianSVGCanvas.java:264)
> at java.awt.dnd.DropTarget.drop(DropTarget.java:430)
> at sun.awt.dnd.SunDropTargetContextPeer.
> processDropMessage(SunDropTargetContextPeer.java:500)
> at sun.awt.X11.XDropTargetContextPeer.
> processDropMessage(XDropTargetContextPeer.java:165)
> at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.
> dispatchDropEvent(SunDropTargetContextPeer.java:812)
> at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.
> dispatchEvent(SunDropTargetContextPeer.java:736)
> at
sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:30)
> at java.awt.Component.dispatchEventImpl(Component.java:4267)
> at java.awt.Container.dispatchEventImpl(Container.java:2116)
> at java.awt.Component.dispatchEvent(Component.java:4240)
> at java.awt.LightweightDispatcher.
> retargetMouseEvent(Container.java:4322)
> at java.awt.LightweightDispatcher.
> processDropTargetEvent(Container.java:4057)
> at
java.awt.LightweightDispatcher.dispatchEvent(Container.java:3911)
> at java.awt.Container.dispatchEventImpl(Container.java:2102)
> at java.awt.Window.dispatchEventImpl(Window.java:2429)
> at java.awt.Component.dispatchEvent(Component.java:4240)
> at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
> at java.awt.EventDispatchThread.
> pumpOneEventForFilters(EventDispatchThread.java:273)
> at java.awt.EventDispatchThread.
> pumpEventsForFilter(EventDispatchThread.java:183)
> at java.awt.EventDispatchThread.
> pumpEventsForHierarchy(EventDispatchThread.java:173)
> at java.awt.EventDispatchThread.
> pumpEvents(EventDispatchThread.java:168)
> at java.awt.EventDispatchThread.
> pumpEvents(EventDispatchThread.java:160)
> at
java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
>
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>