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Posted to batik-users@xmlgraphics.apache.org by Rishabh Rao <ri...@gmail.com> on 2010/04/25 07:23:44 UTC
How to use org.apache.batik.bridge.UpdateManager?
Hello!
We are a team 3 students who are developing an opensource application called
Chart Glazer. The application helps the users draw charts (process diagrams,
organization charts etc.) easily. It is very much similar to Microsoft
Office 2007's SmartArt.
We're using Apache Batik and Java Swing for our development. Our project is
hosted at http://kenai.com/projects/chartglazer.
The FAQ at http://xmlgraphics.apache.org/batik/faq.html talks about using
the UpdateManager.
We are facing the exact same problem, as in section 3.3 of the FAQ, "When I
change the document in Java it only updates if I move the mouse over the
canvas?"
We have reproduced our problem into a smaller application (called
SVGApplication), using NetBeans. It has a JButton (called
loadDocumentJButton) and a JSVGCanvas (called myJSVGCanvas) present inside a
JScrollPane object.
Our requirement is that when we click this "loadDocumentJButton" button, the
the "myJSVGCanvas" object must display the "myRectangle" (see code below.)
Here is the "actionPerformed" event handler for "loadDocumentJButton"...
private void loadDocumentJButtonActionPerformed(java.awt.event.ActionEvent
evt)
{
DOMImplementation myDOMImplementation =
SVGDOMImplementation.getDOMImplementation();
Document myDocument =
myDOMImplementation.createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI,
"svg", null);
Element svgRoot = myDocument.getDocumentElement();
SVGGraphics2D mySVGGraphics2D = new SVGGraphics2D(myDocument);
mySVGGraphics2D.setSVGCanvasSize(new Dimension(320, 240));
myJSVGCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
myJSVGCanvas.setDocument(myDocument);
Rectangle myRectangle = new Rectangle(10, 10, 60, 40);
mySVGGraphics2D.draw(myRectangle);
svgRoot.appendChild(mySVGGraphics2D.getRoot());
}
The rectangle is being displayed only when we move the mouse over the
"myJSVGCanvas" object in the Swing GUI window.
We understand that we must use UpdateManager to solve this problem. But we
don't know how to use it. We searched a lot on the Internet and
mail-archives, but we are not able to figure things out. We did not find any
example programs. If we get an example program that demonstrates the use of
UpdateManager, we will figure it out on our own. It would be great if you
provide us with such an example program.
Please help us.
We are attaching the 3 files of "SVGApplication" (created usingNetBeans) for
your reference. The above event handler function is located in the
SVGView.java. Probably, the other two files will not be required; we have
just attached it for completeness' sake.
Thank you very much!
Regards,
Rishabh Rao, Narendra G S and Praveen K S
Re: How to use org.apache.batik.bridge.UpdateManager?
Posted by Rishabh Rao <ri...@gmail.com>.
Hello Thomas,
Thank you for your reply! We are, in fact, making significant amount of
changes to our SVG document, so I think we'll go for the setSVGDocument
method.
Regards,
Rishabh
On Tue, Apr 27, 2010 at 3:32 PM, <th...@kodak.com> wrote:
> Hi Rishabh,
>
> Rishabh Rao <ri...@gmail.com> wrote on 04/25/2010 03:31:43 PM:
>
>
> > Also, guess what, we were able to update our canvas display without
> > using UpdateManager!
> >
> > Actually, in our main project, we've created a class that extends
> > SwingWorker (our backend processing is a tad bit time consuming, so
> > we're scheduling it on a SwingWorker thread.)
> >
> > So now, we've overridden the SwingWorker.done method to our advantage!
> > We're calling the JSVGCanvas object's setSVGDocument method in the
> > above done method. So we can be sure that the SVGDocument is
> > populated.
>
>
> This may be correct but given your earlier statements it seems
> likely to be very inefficient. The basic difference between using
> the UpdateManager's update thread to modify the document and calling
> 'setSVGDocument' is that calling setSVGDocument causes the canvas to
> start from scratch an totally rebuild the graphics tree and then
> render everything from scratch. However if you modify the document
> in the UpdateManager's update thread then only the portion of the
> document modified is rebuilt and rerendered.
>
> Based on this information the inefficiency of setSVGDocument
> is basically a function of how much of the document is modified.
> If you are modifying a few elements out of hundreds then calling
> setSVGDocument will be very inefficient, but if you are modifying
> most of those hundreds of elements then calling setSVGDocument
> wouldn't be too bad.
>
> > On 4/25/10, jonathan wood <jo...@gmail.com> wrote:
> > > Hello Rishabh, Narendra and Praveen,
> > >
> > > A couple of observations:
> > >
> > > You really have no context in which to manipulate the DOM until the
> > > document is loaded. Your best bet is to add a GVTTreeBuilderListener.
> > > Also, it is much easier to work directly with the DOM objects and let
> the
> > > GVT take care of rendering the 2D.
> > > Red the attached snippet carefully...the listener code is invoked
> after
> > > the document is loaded.
> > >
> > > private void runDemo() {
> > > svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> > > svgCanvas.addGVTTreeBuilderListener(new GVTTreeBuilderAdapter()
> {
> > > @Override
> > > public void gvtBuildCompleted(GVTTreeBuilderEvent e) {
> > >
> > > svgCanvas.getUpdateManager().getUpdateRunnableQueue().invokeLater(new
> > > Runnable() {
> > > public void run() {
> > > Element rect =
> > > svgCanvas.getSVGDocument().createElementNS
> > (SVGDOMImplementation.SVG_NAMESPACE_URI,
> > > SVGConstants.SVG_RECT_TAG);
> > > rect.setAttributeNS(null,
> > > SVGConstants.SVG_X_ATTRIBUTE, "100");
> > > rect.setAttributeNS(null,
> > > SVGConstants.SVG_Y_ATTRIBUTE, "100");
> > > rect.setAttributeNS(null,
> > > SVGConstants.SVG_WIDTH_ATTRIBUTE, "100");
> > > rect.setAttributeNS(null,
> > > SVGConstants.SVG_HEIGHT_ATTRIBUTE, "100");
> > > rect.setAttributeNS(null,
> > > SVGConstants.SVG_FILL_ATTRIBUTE, "#2222ee");
> > >
> > > svgCanvas.getSVGDocument().getDocumentElement().appendChild(rect);
> > > }
> > > });
> > > }
> > > });
> > > Document doc =
> > > SVGDOMImplementation.getDOMImplementation().createDocument
> > (SVGDOMImplementation.SVG_NAMESPACE_URI,
> > > "svg", null);
> > > svgCanvas.setSVGDocument((SVGDocument) doc);
> > > }
> > >
> > >
> > > On Sun, Apr 25, 2010 at 1:23 AM, Rishabh Rao <ri...@gmail.com>
> wrote:
> > >
> > >> Hello!
> > >> We are a team 3 students who are developing an opensource application
> > >> called Chart Glazer. The application helps the users draw charts
> (process
> > >> diagrams, organization charts etc.) easily. It is very much similar to
> > >> Microsoft Office 2007's SmartArt.
> > >> We're using Apache Batik and Java Swing for our development. Our
> project
> > >> is
> > >> hosted at http://kenai.com/projects/chartglazer.
> > >> The FAQ at http://xmlgraphics.apache.org/batik/faq.html talks about
> using
> > >> the UpdateManager.
> > >> We are facing the exact same problem, as in section 3.3 of the FAQ,
> "When
> > >> I
> > >> change the document in Java it only updates if I move the mouse over
> the
> > >> canvas?"
> > >> We have reproduced our problem into a smaller application (called
> > >> SVGApplication), using NetBeans. It has a JButton (called
> > >> loadDocumentJButton) and a JSVGCanvas (called myJSVGCanvas) present
> inside
> > >> a
> > >> JScrollPane object.
> > >> Our requirement is that when we click this "loadDocumentJButton"
> button,
> > >> the the "myJSVGCanvas" object must display the "myRectangle" (see code
> > >> below.)
> > >> Here is the "actionPerformed" event handler for
> "loadDocumentJButton"...
> > >> private void
> loadDocumentJButtonActionPerformed(java.awt.event.ActionEvent
> > >> evt)
> > >> {
> > >> DOMImplementation myDOMImplementation =
> > >> SVGDOMImplementation.getDOMImplementation();
> > >> Document myDocument =
> > >>
> myDOMImplementation.createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI,
> > >> "svg", null);
> > >> Element svgRoot = myDocument.getDocumentElement();
> > >>
> > >> SVGGraphics2D mySVGGraphics2D = new SVGGraphics2D(myDocument);
> > >> mySVGGraphics2D.setSVGCanvasSize(new Dimension(320, 240));
> > >>
> > >> myJSVGCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> > >> myJSVGCanvas.setDocument(myDocument);
> > >>
> > >> Rectangle myRectangle = new Rectangle(10, 10, 60, 40);
> > >>
> > >> mySVGGraphics2D.draw(myRectangle);
> > >>
> > >> svgRoot.appendChild(mySVGGraphics2D.getRoot());
> > >> }
> > >> The rectangle is being displayed only when we move the mouse over the
> > >> "myJSVGCanvas" object in the Swing GUI window.
> > >>
> > >> We understand that we must use UpdateManager to solve this problem.
> But we
> > >> don't know how to use it. We searched a lot on the Internet and
> > >> mail-archives, but we are not able to figure things out. We did not
> find
> > >> any
> > >> example programs. If we get an example program that demonstrates the
> use
> > >> of
> > >> UpdateManager, we will figure it out on our own. It would be great if
> you
> > >> provide us with such an example program.
> > >> Please help us.
> > >> We are attaching the 3 files of "SVGApplication" (created
> usingNetBeans)
> > >> for your reference. The above event handler function is located in the
> > >> SVGView.java. Probably, the other two files will not be required; we
> have
> > >> just attached it for completeness' sake.
> > >> Thank you very much!
> > >> Regards,
> > >> Rishabh Rao, Narendra G S and Praveen K S
> > >>
> > >>
> > >> ---------------------------------------------------------------------
> > >> To unsubscribe, e-mail:
> batik-users-unsubscribe@xmlgraphics.apache.org
> > >> For additional commands, e-mail:
> batik-users-help@xmlgraphics.apache.org
> > >>
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
> > For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org
> >
>
>
Re: How to use org.apache.batik.bridge.UpdateManager?
Posted by th...@kodak.com.
Hi Rishabh,
Rishabh Rao <ri...@gmail.com> wrote on 04/25/2010 03:31:43 PM:
> Also, guess what, we were able to update our canvas display without
> using UpdateManager!
>
> Actually, in our main project, we've created a class that extends
> SwingWorker (our backend processing is a tad bit time consuming, so
> we're scheduling it on a SwingWorker thread.)
>
> So now, we've overridden the SwingWorker.done method to our advantage!
> We're calling the JSVGCanvas object's setSVGDocument method in the
> above done method. So we can be sure that the SVGDocument is
> populated.
This may be correct but given your earlier statements it seems
likely to be very inefficient. The basic difference between using
the UpdateManager's update thread to modify the document and calling
'setSVGDocument' is that calling setSVGDocument causes the canvas to
start from scratch an totally rebuild the graphics tree and then
render everything from scratch. However if you modify the document
in the UpdateManager's update thread then only the portion of the
document modified is rebuilt and rerendered.
Based on this information the inefficiency of setSVGDocument
is basically a function of how much of the document is modified.
If you are modifying a few elements out of hundreds then calling
setSVGDocument will be very inefficient, but if you are modifying
most of those hundreds of elements then calling setSVGDocument
wouldn't be too bad.
> On 4/25/10, jonathan wood <jo...@gmail.com> wrote:
> > Hello Rishabh, Narendra and Praveen,
> >
> > A couple of observations:
> >
> > You really have no context in which to manipulate the DOM until the
> > document is loaded. Your best bet is to add a GVTTreeBuilderListener.
> > Also, it is much easier to work directly with the DOM objects and let
the
> > GVT take care of rendering the 2D.
> > Red the attached snippet carefully...the listener code is invoked
after
> > the document is loaded.
> >
> > private void runDemo() {
> > svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> > svgCanvas.addGVTTreeBuilderListener(new
GVTTreeBuilderAdapter() {
> > @Override
> > public void gvtBuildCompleted(GVTTreeBuilderEvent e) {
> >
> > svgCanvas.getUpdateManager().getUpdateRunnableQueue().invokeLater(new
> > Runnable() {
> > public void run() {
> > Element rect =
> > svgCanvas.getSVGDocument().createElementNS
> (SVGDOMImplementation.SVG_NAMESPACE_URI,
> > SVGConstants.SVG_RECT_TAG);
> > rect.setAttributeNS(null,
> > SVGConstants.SVG_X_ATTRIBUTE, "100");
> > rect.setAttributeNS(null,
> > SVGConstants.SVG_Y_ATTRIBUTE, "100");
> > rect.setAttributeNS(null,
> > SVGConstants.SVG_WIDTH_ATTRIBUTE, "100");
> > rect.setAttributeNS(null,
> > SVGConstants.SVG_HEIGHT_ATTRIBUTE, "100");
> > rect.setAttributeNS(null,
> > SVGConstants.SVG_FILL_ATTRIBUTE, "#2222ee");
> >
> > svgCanvas.getSVGDocument().getDocumentElement().appendChild(rect);
> > }
> > });
> > }
> > });
> > Document doc =
> > SVGDOMImplementation.getDOMImplementation().createDocument
> (SVGDOMImplementation.SVG_NAMESPACE_URI,
> > "svg", null);
> > svgCanvas.setSVGDocument((SVGDocument) doc);
> > }
> >
> >
> > On Sun, Apr 25, 2010 at 1:23 AM, Rishabh Rao <ri...@gmail.com>
wrote:
> >
> >> Hello!
> >> We are a team 3 students who are developing an opensource application
> >> called Chart Glazer. The application helps the users draw charts
(process
> >> diagrams, organization charts etc.) easily. It is very much similar
to
> >> Microsoft Office 2007's SmartArt.
> >> We're using Apache Batik and Java Swing for our development. Our
project
> >> is
> >> hosted at http://kenai.com/projects/chartglazer.
> >> The FAQ at http://xmlgraphics.apache.org/batik/faq.html talks about
using
> >> the UpdateManager.
> >> We are facing the exact same problem, as in section 3.3 of the FAQ,
"When
> >> I
> >> change the document in Java it only updates if I move the mouse over
the
> >> canvas?"
> >> We have reproduced our problem into a smaller application (called
> >> SVGApplication), using NetBeans. It has a JButton (called
> >> loadDocumentJButton) and a JSVGCanvas (called myJSVGCanvas) present
inside
> >> a
> >> JScrollPane object.
> >> Our requirement is that when we click this "loadDocumentJButton"
button,
> >> the the "myJSVGCanvas" object must display the "myRectangle" (see
code
> >> below.)
> >> Here is the "actionPerformed" event handler for
"loadDocumentJButton"...
> >> private void
loadDocumentJButtonActionPerformed(java.awt.event.ActionEvent
> >> evt)
> >> {
> >> DOMImplementation myDOMImplementation =
> >> SVGDOMImplementation.getDOMImplementation();
> >> Document myDocument =
> >>
myDOMImplementation.createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI,
> >> "svg", null);
> >> Element svgRoot = myDocument.getDocumentElement();
> >>
> >> SVGGraphics2D mySVGGraphics2D = new SVGGraphics2D(myDocument);
> >> mySVGGraphics2D.setSVGCanvasSize(new Dimension(320, 240));
> >>
> >> myJSVGCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> >> myJSVGCanvas.setDocument(myDocument);
> >>
> >> Rectangle myRectangle = new Rectangle(10, 10, 60, 40);
> >>
> >> mySVGGraphics2D.draw(myRectangle);
> >>
> >> svgRoot.appendChild(mySVGGraphics2D.getRoot());
> >> }
> >> The rectangle is being displayed only when we move the mouse over the
> >> "myJSVGCanvas" object in the Swing GUI window.
> >>
> >> We understand that we must use UpdateManager to solve this problem.
But we
> >> don't know how to use it. We searched a lot on the Internet and
> >> mail-archives, but we are not able to figure things out. We did not
find
> >> any
> >> example programs. If we get an example program that demonstrates the
use
> >> of
> >> UpdateManager, we will figure it out on our own. It would be great if
you
> >> provide us with such an example program.
> >> Please help us.
> >> We are attaching the 3 files of "SVGApplication" (created
usingNetBeans)
> >> for your reference. The above event handler function is located in
the
> >> SVGView.java. Probably, the other two files will not be required; we
have
> >> just attached it for completeness' sake.
> >> Thank you very much!
> >> Regards,
> >> Rishabh Rao, Narendra G S and Praveen K S
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail:
batik-users-unsubscribe@xmlgraphics.apache.org
> >> For additional commands, e-mail:
batik-users-help@xmlgraphics.apache.org
> >>
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
> For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org
>
Re: How to use org.apache.batik.bridge.UpdateManager?
Posted by Rishabh Rao <ri...@gmail.com>.
Hello Jonathan,
Thank you for your reply! We understood a lot of things by examining
your code snippet.
Also, this book (http://www.sundraw.ws/batik.jsp) is an excellent
resource for newbies learning Batik. We learnt a lot from this book
too!
Also, guess what, we were able to update our canvas display without
using UpdateManager!
Actually, in our main project, we've created a class that extends
SwingWorker (our backend processing is a tad bit time consuming, so
we're scheduling it on a SwingWorker thread.)
So now, we've overridden the SwingWorker.done method to our advantage!
We're calling the JSVGCanvas object's setSVGDocument method in the
above done method. So we can be sure that the SVGDocument is
populated. For a more in-depth look, please have a look at our project
at http://kenai.com/projects/chartglazer. The file ChartGlazerGUI.java
is located in the edu.jss.ise.chartglazer.ui package.
I hope this is the correct approach. Please correct us if we are wrong.
Thank you once again!
Best regards,
Rishabh Rao, Narendra G S and Praveen K S
On 4/25/10, jonathan wood <jo...@gmail.com> wrote:
> Hello Rishabh, Narendra and Praveen,
>
> A couple of observations:
>
> You really have no context in which to manipulate the DOM until the
> document is loaded. Your best bet is to add a GVTTreeBuilderListener.
> Also, it is much easier to work directly with the DOM objects and let the
> GVT take care of rendering the 2D.
> Red the attached snippet carefully...the listener code is invoked after
> the document is loaded.
>
> private void runDemo() {
> svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> svgCanvas.addGVTTreeBuilderListener(new GVTTreeBuilderAdapter() {
> @Override
> public void gvtBuildCompleted(GVTTreeBuilderEvent e) {
>
> svgCanvas.getUpdateManager().getUpdateRunnableQueue().invokeLater(new
> Runnable() {
> public void run() {
> Element rect =
> svgCanvas.getSVGDocument().createElementNS(SVGDOMImplementation.SVG_NAMESPACE_URI,
> SVGConstants.SVG_RECT_TAG);
> rect.setAttributeNS(null,
> SVGConstants.SVG_X_ATTRIBUTE, "100");
> rect.setAttributeNS(null,
> SVGConstants.SVG_Y_ATTRIBUTE, "100");
> rect.setAttributeNS(null,
> SVGConstants.SVG_WIDTH_ATTRIBUTE, "100");
> rect.setAttributeNS(null,
> SVGConstants.SVG_HEIGHT_ATTRIBUTE, "100");
> rect.setAttributeNS(null,
> SVGConstants.SVG_FILL_ATTRIBUTE, "#2222ee");
>
> svgCanvas.getSVGDocument().getDocumentElement().appendChild(rect);
> }
> });
> }
> });
> Document doc =
> SVGDOMImplementation.getDOMImplementation().createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI,
> "svg", null);
> svgCanvas.setSVGDocument((SVGDocument) doc);
> }
>
>
> On Sun, Apr 25, 2010 at 1:23 AM, Rishabh Rao <ri...@gmail.com> wrote:
>
>> Hello!
>> We are a team 3 students who are developing an opensource application
>> called Chart Glazer. The application helps the users draw charts (process
>> diagrams, organization charts etc.) easily. It is very much similar to
>> Microsoft Office 2007's SmartArt.
>> We're using Apache Batik and Java Swing for our development. Our project
>> is
>> hosted at http://kenai.com/projects/chartglazer.
>> The FAQ at http://xmlgraphics.apache.org/batik/faq.html talks about using
>> the UpdateManager.
>> We are facing the exact same problem, as in section 3.3 of the FAQ, "When
>> I
>> change the document in Java it only updates if I move the mouse over the
>> canvas?"
>> We have reproduced our problem into a smaller application (called
>> SVGApplication), using NetBeans. It has a JButton (called
>> loadDocumentJButton) and a JSVGCanvas (called myJSVGCanvas) present inside
>> a
>> JScrollPane object.
>> Our requirement is that when we click this "loadDocumentJButton" button,
>> the the "myJSVGCanvas" object must display the "myRectangle" (see code
>> below.)
>> Here is the "actionPerformed" event handler for "loadDocumentJButton"...
>> private void loadDocumentJButtonActionPerformed(java.awt.event.ActionEvent
>> evt)
>> {
>> DOMImplementation myDOMImplementation =
>> SVGDOMImplementation.getDOMImplementation();
>> Document myDocument =
>> myDOMImplementation.createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI,
>> "svg", null);
>> Element svgRoot = myDocument.getDocumentElement();
>>
>> SVGGraphics2D mySVGGraphics2D = new SVGGraphics2D(myDocument);
>> mySVGGraphics2D.setSVGCanvasSize(new Dimension(320, 240));
>>
>> myJSVGCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
>> myJSVGCanvas.setDocument(myDocument);
>>
>> Rectangle myRectangle = new Rectangle(10, 10, 60, 40);
>>
>> mySVGGraphics2D.draw(myRectangle);
>>
>> svgRoot.appendChild(mySVGGraphics2D.getRoot());
>> }
>> The rectangle is being displayed only when we move the mouse over the
>> "myJSVGCanvas" object in the Swing GUI window.
>>
>> We understand that we must use UpdateManager to solve this problem. But we
>> don't know how to use it. We searched a lot on the Internet and
>> mail-archives, but we are not able to figure things out. We did not find
>> any
>> example programs. If we get an example program that demonstrates the use
>> of
>> UpdateManager, we will figure it out on our own. It would be great if you
>> provide us with such an example program.
>> Please help us.
>> We are attaching the 3 files of "SVGApplication" (created usingNetBeans)
>> for your reference. The above event handler function is located in the
>> SVGView.java. Probably, the other two files will not be required; we have
>> just attached it for completeness' sake.
>> Thank you very much!
>> Regards,
>> Rishabh Rao, Narendra G S and Praveen K S
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
>> For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org
>>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org
Re: How to use org.apache.batik.bridge.UpdateManager?
Posted by jonathan wood <jo...@gmail.com>.
Hello Rishabh, Narendra and Praveen,
A couple of observations:
You really have no context in which to manipulate the DOM until the
document is loaded. Your best bet is to add a GVTTreeBuilderListener.
Also, it is much easier to work directly with the DOM objects and let the
GVT take care of rendering the 2D.
Red the attached snippet carefully...the listener code is invoked after
the document is loaded.
private void runDemo() {
svgCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
svgCanvas.addGVTTreeBuilderListener(new GVTTreeBuilderAdapter() {
@Override
public void gvtBuildCompleted(GVTTreeBuilderEvent e) {
svgCanvas.getUpdateManager().getUpdateRunnableQueue().invokeLater(new
Runnable() {
public void run() {
Element rect =
svgCanvas.getSVGDocument().createElementNS(SVGDOMImplementation.SVG_NAMESPACE_URI,
SVGConstants.SVG_RECT_TAG);
rect.setAttributeNS(null,
SVGConstants.SVG_X_ATTRIBUTE, "100");
rect.setAttributeNS(null,
SVGConstants.SVG_Y_ATTRIBUTE, "100");
rect.setAttributeNS(null,
SVGConstants.SVG_WIDTH_ATTRIBUTE, "100");
rect.setAttributeNS(null,
SVGConstants.SVG_HEIGHT_ATTRIBUTE, "100");
rect.setAttributeNS(null,
SVGConstants.SVG_FILL_ATTRIBUTE, "#2222ee");
svgCanvas.getSVGDocument().getDocumentElement().appendChild(rect);
}
});
}
});
Document doc =
SVGDOMImplementation.getDOMImplementation().createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI,
"svg", null);
svgCanvas.setSVGDocument((SVGDocument) doc);
}
On Sun, Apr 25, 2010 at 1:23 AM, Rishabh Rao <ri...@gmail.com> wrote:
> Hello!
> We are a team 3 students who are developing an opensource application
> called Chart Glazer. The application helps the users draw charts (process
> diagrams, organization charts etc.) easily. It is very much similar to
> Microsoft Office 2007's SmartArt.
> We're using Apache Batik and Java Swing for our development. Our project is
> hosted at http://kenai.com/projects/chartglazer.
> The FAQ at http://xmlgraphics.apache.org/batik/faq.html talks about using
> the UpdateManager.
> We are facing the exact same problem, as in section 3.3 of the FAQ, "When I
> change the document in Java it only updates if I move the mouse over the
> canvas?"
> We have reproduced our problem into a smaller application (called
> SVGApplication), using NetBeans. It has a JButton (called
> loadDocumentJButton) and a JSVGCanvas (called myJSVGCanvas) present inside a
> JScrollPane object.
> Our requirement is that when we click this "loadDocumentJButton" button,
> the the "myJSVGCanvas" object must display the "myRectangle" (see code
> below.)
> Here is the "actionPerformed" event handler for "loadDocumentJButton"...
> private void loadDocumentJButtonActionPerformed(java.awt.event.ActionEvent
> evt)
> {
> DOMImplementation myDOMImplementation =
> SVGDOMImplementation.getDOMImplementation();
> Document myDocument =
> myDOMImplementation.createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI,
> "svg", null);
> Element svgRoot = myDocument.getDocumentElement();
>
> SVGGraphics2D mySVGGraphics2D = new SVGGraphics2D(myDocument);
> mySVGGraphics2D.setSVGCanvasSize(new Dimension(320, 240));
>
> myJSVGCanvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
> myJSVGCanvas.setDocument(myDocument);
>
> Rectangle myRectangle = new Rectangle(10, 10, 60, 40);
>
> mySVGGraphics2D.draw(myRectangle);
>
> svgRoot.appendChild(mySVGGraphics2D.getRoot());
> }
> The rectangle is being displayed only when we move the mouse over the
> "myJSVGCanvas" object in the Swing GUI window.
>
> We understand that we must use UpdateManager to solve this problem. But we
> don't know how to use it. We searched a lot on the Internet and
> mail-archives, but we are not able to figure things out. We did not find any
> example programs. If we get an example program that demonstrates the use of
> UpdateManager, we will figure it out on our own. It would be great if you
> provide us with such an example program.
> Please help us.
> We are attaching the 3 files of "SVGApplication" (created usingNetBeans)
> for your reference. The above event handler function is located in the
> SVGView.java. Probably, the other two files will not be required; we have
> just attached it for completeness' sake.
> Thank you very much!
> Regards,
> Rishabh Rao, Narendra G S and Praveen K S
>
>
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