Re: [zvtm-devel] Creating VPaths

[SAK <sa...@ge...>]

I have tried all the possible options. What i wish to have is something
like
polyline in java.awt.graphics. You just pass on a list of array of x and
y points.
I have worked in SVG i understand those. But Your framework gives the
beauty 
to present information in different perspectives. If i could achieve
this way of 
drawing roadnetworks as polylines. It would be helpful.



On Fri, 2005-07-08 at 16:14, Emmanuel Pietriga wrote:
> SAK wrote:
> > I was trying to define VPaths as road Networks. I am not successfull in
> > that, when i draw them as segments this is drawn as a straight line.
> 
> First of all, we might have a terminology issue here. In my mind, there
> is no difference between a segment and a straight line. It is the same
> thing. So, what difference do you make between a segment and a straight
> line?
> 
> I suppose that what you want to do is draw curved lines? Is that right?
> If so, you have to instantiate a VPath object and then append new
> elements to it, like quadratic curves and cubic curves (methods
> addQdCurve() and addCbCurve()). If you want to add straight lines to it,
> use addSegment. If you want to add a "gap", use method jump(). [1] can
> give you a quick introduction on quadratic and cubic curves if you are
> not familiar with these and the terminology (control point, end point).
> 
> Another solution consists in instantiating the path directly with all
> its elements by providing them as a String representing an SVG sequence
> of end and control point coordinates. Once you are familiar with the
> syntax, it is a quick way to create VPaths.
> 
> [1] http://www.w3.org/2001/11/IsaViz/splines.html
> [2] http://www.w3.org/TR/SVG11/paths.html#PathDataGeneralInformation
> 
> I can provide you with a few actual examples of VPath instantiations in
> Java+ZVTM if you want.
> 
> 
> > Also, the complexities of drawing road networks is that in reality each
> > of these road networks has a unique name. 
> 
> I'm not sure I understand. What kind of complexity does this add? Do you
> want to display the name of roads?
> 
> 
> > I wish to capture the co-ordinates on map, and then select all the
> > objects lying that region, and perfrom a set of operations. How best can
> > i achieve that.
> 
> I've answered that question in a separate email to the list (Subject:
> "Selecting glyphs in a rectangular region drawn by hand").
> 
> cheers,
> Emmanuel
> 
> 
> 
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