Re: Rounded Polyline, and other questions?

[anthonym overture com]

Just curious if there are any comments about the patch I submitted?

Thanks for any feedback.

-Anthony

On Wed, Jun 16, 2004 at 02:23:51PM -0700, anthonym overture com wrote:
> Okay, here's the patch against the HEAD.  Let me know if there are any
> changes people might like.  As for moving some things to geometry,
> specifically I'm talking about the somewhat general point_cross, dot2,
> line_coef, line_to_point, and point_perp.  Although the fillet function
> could also arguably be there or not.
>
> The algorithm was taken from one of the Graphics Gems books, all of
> whose code is in the public domain (as stated in the book), you can
> find all the code from the books here
>
> http://www.acm.org/tog/GraphicsGems/
>
> There are lots of 2D algorithms for all sorts of interesting geometrical
> problems in the series, some of which may be useful to others.  I've
> definately found it useful.
>
> Anyway, let me know if some changes should be made to the patch.  Also
> let me know if I missed anything in it.
>
> -Anthony
>
> On Wed, Jun 16, 2004 at 07:00:23AM +0200, Cyrille Chepelov wrote:
> > Le Tue, Jun 15, 2004, Ã  10:50:36AM -0700, anthonym overture com a écrit:
> > > Wow, its been a while since I posted this, but I've been super busy with
> > > other stuff.  Anyway, last night I finished a first pass at adding
> > > rounded corners to zigzaglines and polylines, by adding some code to
> > > the diarenderer.  I was developing against the DIA_0_94_DEV tag, should
> > > I post patches against that, or against the HEAD?  Also, I'd be interested
> > > once I post it in knowing whether some of the added functions should make
> > > their way into the geometry.* files.
> >
> > geometry.* ? Oh. Probably, let's have a look at the code!
> >
> > > Anyway, if someone could let me know which is the current tag to submit
> > > patches against I'll post it.
> >
> > HEAD.
> >
> >     -- Cyrille
> >     
> > > -Anthony
> > >
> > > On Wed, Apr 28, 2004 at 10:44:47AM +0200, Cyrille Chepelov wrote:
> > > > Le Mon, Apr 26, 2004, Ã  02:32:28PM -0700, anthonym overture com a écrit:
> > > >
> > > > >   Now I'm working on the sequence and message flows which are essentially
> > > > > zigzaglines with a certain subset of arrows.  One difference however is
> > > > > that in the BPMN docs, the flows use orthogonal connections with rounded
> > > > > corners, and I would like to mimic this.
> > > > >
> > > > >   I've looked the the current crop of programmed objects and found that
> > > > > the SADT arrow does this, but this object seems to rely on a new orth
> > > > > connection object which is claimed to be a short term object.
> > > > > The SADT arrow also seems to not include some of the code in the
> > > > > zigzagline which pushes the line behind the arrow point (behavior I like
> > > > > because it makes the arrow heads look nicer).
> > > >
> > > > Indeed. SADT was one of my first dips into dia, and it hasn't
> > > > benefited from some subsequent waves of refactoring. In particular, not
> > > > only it does not push the line end behind the arrow point like most
> > > > other objects do, but I think it also lacks autorouting and
> > > > autodirection.
> > > >
> > > > The approach you outlined seems like a good plan (especially with the
> > > > default renderer in place), and I'm looking forwards to seeing it. If
> > > > you have the time to refactor and port SADT arrow over to the new code
> > > > (beware the automatic colouring), my gratitude will be proportional to
> > > > the number of SADT-specific line you delete, at constant feature set ;-)
> > > >
> > > >
> > > >
> > > > >   Now I have a couple of questions.  Is the above a feasible approach?
> > > > > Are there any recommendations on different approaches?  Should I
> > > > > implement a rounded corner dialog into the zigzagline, such that
> > > > > the corner rounding works the way it does with the box (ie, you have
> > > > > an option to set a corner radius, if it's zero don't round and use
> > > > > the old functions if it is greater than zero use the rounded methods)?
> > > >
> > > > It could be a simple extra property (for poly_conn and orth_conn). In
> > > > fact, that was my original approach, which Alex shot down in favour of
> > > > diagram type-specific objects (and with the experience since then, I'd
> > > > say he was totally right with respect to user-visible objects, though
> > > > I'd say the question of whether to make PolyConn and OrthConn aware of
> > > > the concept of corner radii, or to extract RoundedPolyConn and
> > > > RoundedOrthConn out of a blend of Poly/OrthConn and "SADT - Arrow" could
> > > > be a subject to debate. I'd say that the former approach may be better
> > > > today, if it can be done without creating a lot of mess in the code. As
> > > > this seems to affect only the rendering and perhaps the mouse hit code
> > > > in the case corner_radius > 1e-3, it may be a good thing to add a
> > > > (hidden, unsaved) corner_radius field to these base classes, which can
> > > > be declared as the storage place for properties in your new objects if
> > > > they need (and statically reinitialised to SADT's current corner
> > > > radius). Later if users want it in the generic zig-zag and ortho line
> > > > objects, the property can be exposed there.
> > > >
> > > > >   I'm really new to the code so could be completely off on all of the
> > > > > above, please correct me if I am.
> > > >
> > > > I think I agree with Lars' reply to this paragraph: welcome on board!
> > > >
> > > >         -- Cyrille
> > > >
> > > > -- 
> > > > _______________________________________________
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> > > > Main page at http://www.lysator.liu.se/~alla/dia
> > >
> > > -- 
> > > ------------------------------------------------------------------------
> > > Anthony Molinaro                                 <anthonym overture com>
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> ------------------------------------------------------------------------
> Anthony Molinaro                                 <anthonym overture com>



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Anthony Molinaro                                 <anthonym overture com>