kicad-developers team mailing list archive
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Re: Metric and English grids sizes.
Dick Hollenbeck <dick@...>
Sun, 11 Oct 2009 13:51:39 -0500
Thunderbird 18.104.22.168 (X11/20090817)
Wayne Stambaugh wrote:
I just wanted to get some feedback on the current grid setting design.
Does it make sense to have both the metric and English grid sizes show
up in the grid selection list? Does anyone want to snap to a 0.127mm or
a 0.254mm grid. I propose changing the grid list to only show the
metric grid sizes when millimeters are selected and English grid sizes
when inches are selected. The user grid will always be shown in the
current units. I already have it coded up and working and wanted to
make sure that there were no objections before I made the commit.
No objections in principal from me. The proof is in the pudding. A
related problem came along, once upon a time:
I placed the metric part on the board using the english grid position.
It was a BGA, fine pitch, enough so to where using a grid would be
helpful in centering tracks. Then later I needed to move or re-route
some tracks. So I switched to metric grid (using user coords). But now
the problem is not the interval between grid cells, but the actual
offset of the grid cell system as a whole (because the part was placed
using english grid cells).
So, one might ask for the ability to align the grid at an alignment
other than (0,0), what I referred to above as an offset. Then I could
have say clicked on a BGA pad, realigned the entire grid to where that
pad was exactly defining one of the grid cells points. Then I can
establish the cell granularity to be some multiple of that pitch.
I hope this helps clarify my problem and a potential solution. Just
having metric without this grid offset may not end up being that helpful.
Or did I miss a capability that is already in Kicad?