Anna Beth Fox wrote:
>Does the SVG spec currently support the notion of placing an object
from the "offset" of another object as the current implementation of
one of our applications relies heavily on this concept? We are looking
at moving from an in-house format to SVG for B2B purposes. In
particular, if we have a polyline, say 812 units long, does SVG support
placing a symbol (such as a circle), say 167 units along the polyline
from the starting point? And what if the polyline is bendy? If this is
possible, then how and a link to an online resource would be great?
Yes it does (and at least IE/ASV, FF, and Opera implement it): using
getPointAtLength (and the associated getTotalLength). If
<path id="P" d="..."> then this JavaScript will find a point halfway along the
path, based on its length:
Path=document.getElementById("P")
var Length=Path.getTotalLength()
var halfLength=Length/2
Mid=Path.getPointAtLength(halfLength)
plotPoint(Mid.x,Mid.y);
//where plotPoint is a function that draws, say, an ellipse at
(P.x, P.y)
It saves the developer a whole boatload of work.
David
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