Translation problem for group element

[Selva <se...@yahoo.co.in>]

Hi All,

I have created <g> element with 2 rectangles. I tried to move the group 
element using translate. but it is not moving properly. Each time it is going 
to initial position, which had before moving the element. I have attached my 
sample code for your reference.
 
OnMouseDownAction 

DOMMouseEvent elEvt = (DOMMouseEvent)evt;
actionNode = elEvt.getTarget();
action = DRAG;
Node n = ((Element)elEvt.getTarget()).getParentNode();
startPt = localPt((Element)n, elEvt.getClientX(), elEvt.getClientY());
dragged = false;


OnMouseMoveAction  

if (action == DRAG) {
Element ee = (Element)((Element)actionNode).getParentNode();
   SVGPoint pt = localPt(ee, elEvt.getClientX(), elEvt.getClientY());
   float dx = pt.getX() - startPt.getX();
   float dy = pt.getY() - startPt.getY();
   ee.setAttribute("transform", "translate(" + dx + ", " + dy + ")");
}

private SVGPoint localPt(Element elem, int x, int y) {
   SVGDocument svgDocument = svgCanvas.getSVGDocument();
   SVGMatrix mat = ((SVGLocatable)elem).getScreenCTM();
   SVGMatrix imat = mat.inverse();
   SVGPoint cPt = svgDocument.getRootElement().createSVGPoint();
   cPt.setX(x);
   cPt.setY(y);
   cPt = cPt.matrixTransform(imat);
   return cPt;
}

Please give me the better solution for dragging the SVG elements in SVGCanvas.

Thanks,
Selva



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Re: Translation problem for group element

[Selva <se...@yahoo.co.in>]

Hi Thomas,

Now it's working fine. Thanks for your immediate response.

Thanks,
Selva




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Re: Translation problem for group element

[th...@kodak.com]

Hi Selva,

news <ne...@sea.gmane.org> wrote on 04/11/2006 09:00:50 AM:

> I have created <g> element with 2 rectangles. I tried to move the group 
> element using translate. but it is not moving properly. Each time it is 
going 
> to initial position, which had before moving the element. I have 
attached my 
> sample code for your reference.

   That is because your localPt function includes the transform you just
set.  You need to pass ee's parent because that is really the coordinate 
system
you are moving in (by adjusting the transform on the group).

> if (action == DRAG) {
> Element ee = (Element)((Element)actionNode).getParentNode();
>    SVGPoint pt = localPt(ee, elEvt.getClientX(), elEvt.getClientY());

   Change this line to:
      SVGPoint pt = localPt((Element)(ee.getParenNode()), 
                            elEvt.getClientX(), elEvt.getClientY());



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