Re: [Inkscape-user] [Inkscape-devel] New LPE, New Video. Fillet/Chamfer
by Jabiertxo Arraiza Cenoz
> Fantastic work, Jabiertxo!
Thanks very much
> Something to think about: If you were writing the curve editing/handle
> code from scratch, how would it work?
Firts to the end:
Not realy a code from scrach. it have a lot of code from Power Stroke,
without this i couldent make this.
Power Stroke store in a vector of Geom::Point the data of his knots,
basicaly in the X coordente store the position in the line and in the Y
coordinate store the distance from knot to original line in
perpendicular. Also have acallback in node tool for handle updates on
the original path.
Whith this base i work the effect. The work in progres add new features
to the original concept whith the feedback of suv, LiamW and ScislaC. I
put the ended result:
I need to store:
Distance from Knot to path:
Stored in the [Y] part. it determine how far is the knot to the path
-configurable by LPE widgets- in poxels, from 0 in the same path, in
away. this is because with some zoom knots hide nearly Nodes and need a
way to move a bit. It reply your 3 question
Hide or show knot:
Knots only show in cusp nodes so [Y] negative values in symm nodes...
make the knot invisible.
Fillet or Chamfer:
It also is handled by the [Y] part of the Geom::Point.
The [Y] value can be an floor(double) or a floor(double)+0.0001.
In case there is decimal part, the effect show as chamfer.
If a knot radius is in mode flexible (green knot):
Store in the X value of the pathvector (int)index_of_pathvector
+(decimal)0.-1 point at this curve. the next curve radius is calculated
by the phisical distande in previous.
If a knot radius is fixed (red knot):
It still store the value in X but is stored in pixels -whith unit
conversions- and with a negative value for easy check. This knots are
exactly the X value in pixels*-1 in both sides.
> 1) to my old astigmatic eyes the tangents do not look like they are
> quite matched, are you sure you have the tangent code correct. This
> is especially noticable when you are filleting a curve rather than a
I look for more deeply.
> 2) can you add fillets with smooth curvature variation (e.g. cornu
> spiral, spiro, and I recall there being a 2geom toy that demonstrated
> something like that).
> 3) I'm not exactly understanding the meaning of the green fillet
> handle - the natural interpretation to me would be to have the green
> diamond at the transition point from the original path to the fillet,
> but yours seems to be offset somehow. Why?
Thanks Nathan for the feedback. I send news soon whith the active
points. Sorry for my english.