The following function allows to keep constant or proportional (see comments)
the text of a JSVGCanvas after zoom operations. Hope it can be useful.
Thanks to Thomas Deweese for support.
private void antiTransformText() {
final Element textElementsGroup =
canvas.getSVGDocument().getElementById(AbstractDOM.STRIDSYMTESTOCENTROIDI);
final NodeList textElement = textElementsGroup.getChildNodes();
final int multiplier = 15;// Scale factor multiplier
for (int i = 0; i < textElement.getLength(); i++) {
final Element element = (Element) textElement.item(i);
try {
final AffineTransform crt =
canvas.getRenderingTransform().createInverse();
// Constant scale factor
// final double scala = (crt.getScaleX() < crt.getScaleY())?
crt.getScaleX() * multiplier : crt.getScaleY() * multiplier;
// Autoreduced scale factor
final double scala = Math.sqrt((crt.getScaleX() <
crt.getScaleY()) ? crt.getScaleX() * multiplier : crt.getScaleY() *
multiplier);
final SVGLocatable loc = (SVGLocatable) element;
final SVGRect bbox = loc.getBBox();
if (bbox != null) {
final float cx = bbox.getX();
final float cy = bbox.getY();
canvas.getUpdateManager().getUpdateRunnableQueue().
invokeLater(new Runnable() {
@Override
public void run() {
// DOM Actions
element.setAttributeNS(
null,
"transform",
"translate(" + cx + "," + cy + "), " +
"scale(" + scala + "), " +
"translate(" + (-cx) + "," + (-cy) + ")");
}
});
}
} catch (NoninvertibleTransformException ex) {
Logger.getLogger(JFrameSvg.class.getName()).log(Level.SEVERE,
null, ex);
}
}
}
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