On 07/10/2019 10:52 PM, Eeli Kaikkonen wrote:> For what it's worth, in
normal graphical arcs (especially in edge cuts) the
two endpoints (or start and end) are usually important, the centerpoint
isn't.
This is not true. Generally for mechanical concerns, you should start
exactly from the centers, which are the anchors of your board.
If you start your design with mechanical constraints in mind, your board
will not have EdgeCuts issues.
My two cents...
Unfortunatly some times the centers are anchors of the board, other
times they are not: when the external case is designed by a "fashon
designer" and you have to put your electronics inside, the board
outlines can be quite weird, not (totally) under our control and the
centers of the board outline arcs are not always anchor points. The
problem is that both the approaches make sense in some situations:
sometimes you like an "exact" center, some others you like "exact"
endpoints.
Personnally I ran into the "endpoint" problem for some board edges,
since to close the perimeter of the board for a step export, the arc
start/endpoint need to be exact, while having an exact arc center was
not so important (considering also the resolution used in kicad and the
mechanical tolerances of the real word, an error of some nm in the
center position should not be a problem).
From a user point of view anything helps in having closed board
outlines when using arbitrary arcs gets my +1 (no matter if this is a
new internal arc data structure or a new "trim" tool to close two
selected edges/arc).
Cheers, Dino.
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