W3C home > Mailing lists > Public > www-svg@w3.org > August 2001

RE: [Moderator Action] marker-mid and Bezier paths

From: Robert DiBlasi <r_diblasi@hotmail.com>
Date: Fri, 24 Aug 2001 16:01:44 +0000
To: ian_tindale@yahoo.co.uk, www-svg@w3.org
Message-ID: <F74RPBuA2NACaW1QxQR0001415f@hotmail.com>
Ian,

  If I understand what your asking for ....This is good idea I would like to 
see this in SVG 2.....and would help people who make maps.

I think is would interesting to tie this concept into dashed lines.
and paths in greneral....that means;

graphics element
One of the element types that can cause graphics to be drawn onto the target 
canvas. Specifically:'path', 'text', 'rect', 'circle', 'ellipse', 'line', 
'polyline', 'polygon', 'image' and 'use'.

and maybe even:

One of SVG's elements that can define a text string that is to be rendered 
onto the canvas. SVG's text content elements are the following: 'text', 
'tspan', 'tref', 'textPath' and 'altGlyph'.

Thank you for sharing your thoughts and Ideas

I think It would be great if it was in SVG 1.1 or SVG 2.0 :-)

We all learn by sharing what we know
Robert A. DiBlasi


Robert A. DiBlasi



>From: "Ian Tindale" <ian_tindale@yahoo.co.uk>
>Reply-To: <ian_tindale@yahoo.co.uk>
>To: <www-svg@w3.org>
>Subject: RE: [Moderator Action] marker-mid and Bezier paths
>Date: Fri, 24 Aug 2001 08:09:11 +0100
>
> > ----- Forwarded message from Mark Nahabedian <naha@ai.mit.edu> -----
> >
> > X-Envelope-From: www-svg-request@tux.w3.org  Thu Aug 23 10:24:35 2001
> > Old-Date: Thu, 23 Aug 2001 10:24:25 -0400 (EDT)
> > From: Mark Nahabedian <naha@ai.mit.edu>
> > To: www-svg@w3.org
> > Cc: naha@ai.mit.edu
> > X-Diagnostic: Not on the accept list
> > Subject: [Moderator Action] marker-mid and Bezier paths
> > X-Diagnostic: Mail coming from a daemon, ignored
> > X-Envelope-To: www-svg
> > X-UIDL: 34b38dacf9e91d1c53e562badc9bfcd3
> >
><snipped stuff>
> > It seems to me that restricting markers to be rendered only at path
> > vertices is unreasonable.  One often wants an arrow (or whatever) in
> > the middle of a graph arc rather than at either end.  It's
> > unreasonable to expect a midpoint to be synthesized for this purpose
> > since doing so would require one to predict all of the points along
> > the path and find the middle one.  This effort is typically beyond the
> > scope or ability of the software generating the SVG (typically in an
> > XSLT transformation).
> > ----- End forwarded message -----
>
>This is an interesting point. How about another way of doing 'markers' - a
>way which although might violate existing mechanisms, would be useful:
>
>1] Specify the orientation of a marker, in perhaps two modes - relative to
>an outer container, or relative to the current direction of a line (with
>programmatic offsets possible).
>
>2] Specify the offset from a point along a line (typically the start or 
>end)
>such that a zero offset means that the marker is where we'd expect it, at
>the end or start of a line, but a positive offset 'pushes it along the 
>line'
>in effect (or use a negative offset to 'push it back', if we placed it at
>the end initially). Then you could specify an absolute value or relative
>percentage along the line, at which point the marker would appear.
>
>If there were a container structure such as a 'markerset' which could
>accommodate intervals and equidistance or some other non-linear 
>distribution
>functions, we could specify that a certain amount of markers be generated
>automatically, along a line, according to the line's length, without having
>to have prior knowledge of how many markers will be needed. Plus, this 
>could
>be made non-scaleable, in that if reduced, the distribution interval stays
>the same, or something.
>
>Hence, we could pile in as many markers as we like, such that we can have
>curvy lines that appear to have those little triangles distributed along
>them, like those weather charts used to have years ago, that the forecaster
>used to point at and explain what a 'front' is every time.
>
>Maybe for SVG two and a half?
>--
>Cheers. Ian Tindale.
>Join the Flash XML Yahoo group:
>http://groups.yahoo.com/group/flashxml/join
>


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Received on Friday, 24 August 2001 12:02:16 GMT

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