Hi Dominik, Andres,
Andres Toussaint wrote:
1.) how do you get the bounding box of a graphical element from the
svg-file that includes the transform?
To my knowledge there is no easy way to recover the bounding box (over
the x,y axis of your canvas) of a transformed shape.
Well it depends on how tight you need the bounds. So you can
fairly simply get the BBox of the element in it's local coordinate
system and then use getTransformToElement or getScreenCTM to map
that bounding box to another coordinate system. For 99% of uses
this is good enough and makes more sense than taking the time to
reproject all the points and recalculate the max/min for each
segment.
The only way i can think of doing it involves retrieving the Java2D
rendering of the element (from the GVTTree), create a new Java2D shape
with affineTransform.createTransformedShape and then query the bounds of
that new shape. Care should be taken that all elements remain in the
same coordinate space.
Thomas: Where would be a the appropriate package to suggest inserting
this kind of utility?
This functionality already exists in the form of the
'getTransformedBounds' call on the batik.gvt.GraphicsNode class.
2.) when I change a node’s attributes, the display doesn’t update
the view, only if I’m moving the mouse e.g . How can I tell my
SVGCanvas to repaint itself? Or shouldn’t it note that
automatically? (My SVGCanvas is
setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);)
Andres is right, please take the time to read the FAQ:
http://xml.apache.org/batik/faqs.html
In particular:
"When I change the document in Java it only updates if I move
the mouse over the canvas?"
http://xml.apache.org/batik/faqs.html#faq-22
I tried this
Element elementById = rootElement.getElementById(“id1”);
if (elementById != null) {
elementById.setAttributeNS(null, "cx", new Double(gps.x).toString());
elementById.setAttributeNS(null, "cy", new Double(gps.y).toString());
}
You need to do your DOM changes in the UpdateManager Thread. You can get
an instance of the UpdateManager thread, once the gvtRendeingCompleted
is called:
svgCanvas.addGVTTreeRendererListener(new GVTTreeRendererAdapter() {
public void gvtRenderingPrepare(GVTTreeRendererEvent e) {
...
}
public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
updateM = svgCanvas.getUpdateManager();
}
});
AND you use it like this:
updateM.getUpdateRunnableQueue().invokeLater(new Runnable() {
public void run() {
// do your DOM changes here.
}
});
Regards,
Andres.
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