SVG 1.2 feature request: event handlers on markers
- Hi all!
At SVG.Open 2004 in Vancouver we discussed the ability to having event handlers
on markers. Doug Schepers kindly reminded me to post this again, since it did
not make it into the current working draft.
We would like to have event handlers on markers, so we could do certain things
that are related to a particular vertex in a polyline or path. The event handler
should return the vertex index (nr of vertex from the beginning of the line).
While this is relatively trivial for polylines, it might be more complex for
path-elements. Here we would possibly need the nr of sub-path geometry and the
number of vertex.
* for all sorts of line-based charts and diagrams we could display data
associated with a particular vertex, imagine having a line-chart of a
stock-exchange development, where you could unveil the underlying data at each
point in time
* for all sorts of SVG-based drawing applications: it would help to modify
existing polylines if the script would know the nth-vertex that needs to be changed
* for technical drawings one could associate and display attribute data or
metadata with vertices
* in GIS and mapping: one could associate and display attribute data with
vertices - imagine having a map that displays skiing lifts. Each vertex
represents a tower/pillar - you could associate all sorts of attributes with
vertices. Getting back the n-th number of vertex that is selected will help to
link to that data.
I am sure there are more use-cases, but the above listed ones are already quite
What do you think, would that be difficult to implement? Do you think it would
be useful for your applications?
I don\'t know the key to success,
but the key to failure is trying to please everybody.
-- Bill Cosby
Andreas Neumann - Department of Cartography
Swiss Federal Institute of Technology (ETH)
ETH Hoenggerberg, CH-8093 Zurich, Switzerland
Phone: ++41-1-633 3031, Fax: ++41-1-633 1153