Hello,
First, thanks to Andreas Neumann for his first advices about my problem.
I am working on a Java application which is using a JSVGCanvas to display some
business informations.
Still in the business part of my application, I may need to perform an update
on a list of text elements in my canvas.
The texts elements are Id and when I remove the object corresponding to the
text, I have to rename the other java objects and their corresponding text in
the canvas.
This represent from 50 to 100 elements that can need to be updated.
Everything works fine but it tooks real long time to update the complete list.
At first, I was using a function to create my elements :
private Element getElementFromText(....) {
// We create the text element
Element
textGroup=svgDom.createElementNS(SVGConstants.SVG_NAMESPACE_URI,SVGConstants.SVG_TEXT_TAG);
// We define its attributes
...
...
Node numTextNode = svgDom.createTextNode(displayNum + " ");
Node statusTextNode = svgDom.createTextNode(displayText);
textGroup.appendChild(numTextNode);
textGroup.appendChild(statusTextNode);
MapActionIdToSVGElements.put(id, numTextNode);
return textGroup;
}
I also added a Map to wrap Id with corresponding Elements in my svgDoc. This
will avoid several getChild operations
This method allows me to create my svg content :
<text style="text-anchor: middle; font-size: 3.3; fill: rgb(0,200,0)"
id="TMTEXT2" transform="translate(0,11.0) scale(1,-1)">
0 F
</text>
And now I can show you how i update this :
The first method is called and just read the map and call a second function
which update a single element
private void updateActionsLabel() {
Set<Integer> s = MapActionIdToSVGElements.keySet();
for(Integer i : s){
modifyActionNumberInSVGDoc(i,"a");
}
}
private boolean modifyActionNumberInSVGDoc(int id, String displayNum)
{
LogManager.getLogManager().log("TMCoreAdaptor>modifyActionNumberInSVGDoc",
"call", null, LogLevel.DEBUG);
Node n = MapActionIdToSVGElements.get(id);
n.setNodeValue("0 ");
return true;
}
I also added some "simple" timer (removed for this post) to get more info. Here
are the results
Updating action labels
-> Updating action label 1 (0 ms)
-> Updating action label 2 (94 ms)
-> Updating action label 3 (78 ms)
-> Updating action label 4 (109 ms)
-> Updating action label 5 (79 ms)
...
-> Updating action label 8 (78 ms)
-> Updating action label 9 (438 ms)
-> Updating action label 10 (78 ms)
...
-> Updating action label 29 (79 ms)
-> Updating action label 28 (78 ms)
-> Updating action label 30 (625 ms)
...
-> Updating action label 52 (78 ms)
Update time 4813 ms
As you can see, there are very long update like #30 with 625ms and the first
one is at 0ms....
I am new to Batik and i must have done something wrong ( I hope that is the
problem... ). I also hope, someone will
figure out what is happening there.
I also tried some other things like :
- suspending the redraw ( same time for execution)
- setting documentstate to static ( better, but i have no refresh)
- removing listeners / adapters (no effect)
Thanks in advance for your help
Julien Beghin
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