On Wed, Sep 14, 2016 at 9:19 AM, Tomasz Wlostowski < [email protected]> wrote:
> On 14.09.2016 00:00, Cirilo Bernardo wrote: > > I think it would be nice to support Bezier curves but aside from adding > > support for editing those curves, I think we need a good enough 2D > > geometry kernel so that we can improve zone outlines and perhaps > > even allow tracks to be straight, arc, or Bezier curve. In general though > > I think good support for "PolyLine" would be of more general use; after > > all any 2D Bezier curve can be easily approximated with a series of > > circular arcs (which a Polyline can do). > > Cirilo, JP, > > I agree we need copper layer arc support. I'm reluctant to add Bezier > curves unless they are approximated as polylines because of the > complexity of necessary DRC functions. Writing an accurate arc-to-arc or > arc-to-segment collision/distance check is already quite difficult. > > I agree regarding the copper layer arc and DRC; I forgot to mention before that I do prefer approximating Beziers with circular arcs because the collision checks are trivial in comparison. Maybe for now leave the Bezier code and consider deprecating/removing it in the future when we have PolyLine support? In my mind, tracks are open polylines and fill zones are closed polylines. When doing DRC checks, a closed polyline can be created to represent a track (or region) and its min. clearance. Checking for collisions between closed polylines is easy - of course it's a little more complex than our current collision code for straight segments, but in cases where we currently represent arcs by short segment approximations I expect the polyline approach to reduce the number of calculations by a significant amount. > Besides, what would be the use of such curves for PCB design other than > fancy graphics (silkscreen, etc)? > > Tom > > Sometimes (though personally I know of extremely few examples) people like to use strange curves for the board outline, but as I said we can replace Beziers with circular arcs. In fact I don't believe DXF supports Beziers so if people are exporting strange board shapes via MCAD we will have a polyline or similar. - Cirilo > > > > > - Cirilo > > > > > > On Wed, Sep 14, 2016 at 4:03 AM, jp charras <[email protected] > > <mailto:[email protected]>> wrote: > > > > Le 13/09/2016 à 11:36, Tomasz Wlostowski a écrit : > > > Hi all, > > > > > > Looking at the sources of the DRAWSEGMENT class (with the hopes of > > > refactoring it a bit to enable arbitrary copper shapes), I noticed > that > > > it supports Bezier curves. They are also supported by the file > format > > > parser/writer. There's however no drawing tool for these. Is this > some > > > outdated code that can be removed or do we plan to support Bezier > curves > > > in PCBnew? > > > > > > Cheers, > > > Tom > > > > In fact, this is not an outdated code, but a not-yet-used code. > > A long time ago, we planned to support Bezier curves in Kicad, but > > this is still on a todo list. > > > > -- > > Jean-Pierre CHARRAS > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~kicad-developers > > <https://launchpad.net/~kicad-developers> > > Post to : [email protected] > > <mailto:[email protected]> > > Unsubscribe : https://launchpad.net/~kicad-developers > > <https://launchpad.net/~kicad-developers> > > More help : https://help.launchpad.net/ListHelp > > <https://help.launchpad.net/ListHelp> > > > > > > > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~kicad-developers > > Post to : [email protected] > > Unsubscribe : https://launchpad.net/~kicad-developers > > More help : https://help.launchpad.net/ListHelp > > > >
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