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Re: Removing segment hard-coding


Am 2019-05-16 08:44, schrieb Seth Hillbrand:
Am 2019-05-16 08:31, schrieb Wayne Stambaugh:

I took a look at this and it looks fine to me.  Refresh my memory, is
this change to reduce the number of arc segments to help address the
performance issues on complex boards or is this change for some other

Correct, this reduces the complexity of boards by reducing the number
of segments needed to approximate small radius curves.

Hi All-

The next step in this is to remove the segment count setting from the file format. I have a baseline patch for this pushed to my segments branch at [1]. As this is a file format change, it makes sense to think about whether we want to add a an option for the board maximum error at the same time.

Currently, we use 0.005mm as the maximum error for most items. This includes approximating arcs, inflating/deflating for clearances and converting items to polygons for plotting. It may make sense to make this value a setting that is stored. There are a few options I see:

1) Put the value in the board file directly. This might make sense because it is used to figure out the copper fills that are stored in the file. But the value itself doesn't directly alter the physical aspect of the board.

2) Put the value in the board settings. This would be alongside things like layer visibility and plot settings.

3) Put the value in the user settings. This would be alongside things like anti-alias settings.

If we go with option (3), we could have a separate value that controls the plot output settings stored like (2) so that two users working on the same board would get the same output.


[1] https://code.launchpad.net/~sethh/kicad/+git/kicad/+ref/segments

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