Hello,
My simple test program (relevant code below) loads an SVG file into a
JSVGCanvas. Clicking a button calls a method that iteratively resizes a
circle in the SVG document.
What I am observing is this:
1) After clicking the toolbar button, I do not see the circle resize
unless I move my mouse into the canvas.
2) Further, unless I continually move my mouse over the canvas I do not
see the iterative resizing. That is, when I continuously move the
mouse, I see the circle change size every second. When I stop, the
circle size does not change. When I move again, I see the updates. If
I move outside of the canvas I see no updates.
How are canvas updates related to mouse position and movement? Is there
something else that I must do to see live or dynamic canvas updates?
// ------- Code:
JSVGCanvas canvas = new JSVGCanvas();
File f = new File(shapes.svg");
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(parser);
Document doc = factory.createDocument(f.toURL().toString());
canvas.setDocument(doc);
canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
...
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread t = new Thread(new Runnable() {
public void run() {
resizeCircle();
}
});
t.start();
}
});
...
private void resizeCircle() throws DOMException {
SVGDocument doc = canvas.getSVGDocument();
Element el = doc.getElementById("circleOne");
for (int i = 0; i < 10; i++) {
if (el.getAttribute("r").equals("20")) { // initial value of r
(radius) is 20
el.setAttribute("r", "50");
else
el.setAttribute("r", "20");
try {
Thread.sleep(1000);
}
catch (InterruptedException ex) {
}
}
}
// -------
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