how to tell whether zoom in or out?

Hey,
I added an eventlistener:
svgDoc.rootElement.addEventListener("SVGZoom", sync, false);
sync is a function that keeps sizes of some shapes constant as the background map zooms.
In order to do that without hard-coding values in, I need to know whether the used clicked zoom-in or zoom-out.
Is there a way to retrieve that information?
Thanks in advance!
Carlos

You can find zoom scale with
document.rootElement.currentScale

Also for pan, currentTranslate return SVGPoint

Michel

Hi,

By default, svg enable us to press "CTRL" + left click to zoom in
and each time we zoom in, the scale will b...
newScale = currentScale * 2...So what i'm trying to do is set it to
b...
newScale = currentScale * 1.5

Below is my code, when i try to zoom in, i get a "Stack overflow"
error. The way i do it is wrong? Can anyone show me the correct way
to do it?

Thanks in advance


<svg id="root" width="200" height="200" viewBox="0 0 200 200"
onload="Initialize(evt)">
<script language="javascript">
<![CDATA[
var currentScale;
var newScale;

function Initialize(evt)
{
var SVGDoc = evt.getTarget().getOwnerDocument
();
SVGRoot = SVGDoc.getElementById("root");
SVGDoc.rootElement.addEventListener
("SVGZoom", zoomScale, false);
}

function zoomScale()
{
currentScale = SVGRoot.currentScale;
newScale = currentScale * 1.5;
SVGRoot.setCurrentScale(newScale);
}
]]></script>
<circle cx="20" cy="20" r="15" style="fill: blue"/>
<rect x="100" y="100" width="10" height="20" style="fill:
green"/>
</svg>