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Re: gEDA-user: Footprint-guide -- is arc description wrong?

This is an interesting point.

Actually I haven't touched the footprint doc in over 2 1/2 years, and
a lot of the info is therefore likely outdated.

I've never been a fan of the PCB manual since it is over 100 pages of
hard to read verbiage with no screenshots  (just IMO).  Newbies
probably find it intimidating, particularly if all they want to do is
draw a footprint. However, it is authoritative, and will always be up-to-date since it is autogenerated. 

Therefore, I wonder if I should withdraw the footprint doc and
point to the File Format section of the on-line PCB manual?  Or
should I simply update the footprint doc?   Or is there somebody on
this list who would like to take over the job of editing the doc and
keeping it current?

Opinions?  Comments?

Stuart



--------------------------------------------
On Tue, 31 Jul 2007, Stefan Salewski wrote:


The description of ElementArcs in footprint creation guide is

misleading. In current pcb measurement of positive values for angles is
counterclockwise as stated in pcb-documentation.

Wrong:

http://www.brorson.com/gEDA/land_patterns_20050129.pdf

StartAngle

Starting angle of arc –
measured in degrees
clockwise from
negative X axis (i.e.
degrees clockwise
from horizontal ray
pointing to the left.)

Delta

Angle swept out by
arc in degrees.
Direction of sweep is
clockwise (CW).


Correct:

http://pcb.sourceforge.net/pcb-cvs/pcb.html

StartAngle

The angle of one end of the arc, in degrees. In PCB, an angle of zero
points left (negative X direction), and 90 degrees points down (positive
Y direction).

DeltaAngle

The sweep of the arc. This may be negative. Positive angles sweep
counterclockwise.




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