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

[Stefan Salewski <mail@xxxxxxxxxxxx>]

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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