> Didn't we come to the view at some point, that using a sufficiently > small metric unit internally would work fine? > > (Due to the definition of 1" = 2.54cm allowing us to precisely specify > both metric and imperial units, given a sufficiently small metric unit?)
Changing the internal units of PCB is not practical at this time. I think we calculated we'd need to maintain micrometer precision to preserve the old "high resolution" units. That means absolutely no more 16-bit coordinate values (oh, darn! ;) and we'd have to be a lot more careful about overflow. Those, however, are technical problems. I did add syntax to the file format to allow you to specify values *with units* so we can at least have metric-based element definitions. They'd still be converte to pcb's inch-based internal units, but perhaps in the future, we can void a lossy conversion. Converting the whole library... no, we'd need to *rebuild* the whole library using "native" units for each part (mm, mil, etc) would be a huge undertaking. But given that some parts (like SOJ or DIP) are specified in terms of inch units, I think the whole concept of a "metric only library" is rather pointless. I think what the OP really wants is not what the OP asked for. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
