Le 02/09/2018 à 12:39, Martin Laabs a écrit : > Hi Jeff, > > On 01.09.2018 12:40, Jeff Young wrote: > >> What’s still missing is the Connection Algorithm (because they’re arcs >> and not tracks). That also means the DRC clearance calculations are >> one-sided as they only take into account the clearance of the colliding >> track or the zone (as the arcs are assumed to have a 0 clearance). > > Is there is a document describing the DRC/Connectivity approach from > KiCAD? I know at least one Layout-Tool which has a full connectivity > check for any shape - independent from the actual shape. > This is very cool since it handles even connections made by arbitrary > imported shapes or connections made through pads touching each other. > > With such an algorithm you don't have to care about the type or shape of > an object which is great in terms of future-proofnes.
Hi Martin, Have you more info about "DRC check for any shape independent from the actual shape" For the DRC tests with pads, Pcbnew uses 2 algorithms: If the pad shape is a basic shape (circle, rect, oval) or can be reduced to a few basic shapes (round rect pads) a fast test is made, with the exact shape (with only rounding approximations in trigonometric calculations) When a pad has a complex shape (trapezoid, custom and future chamfered pads) a polygonal shape is used. Using a polygonal shape works for any shape, but has 2 issues: - the shape is an approximation for every arc. - I am guessing the calculation time is larger than for a basic shape (especially if the polygon has a lot of vertices). > > Best regards, > Martin -- Jean-Pierre CHARRAS _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
