Re: [femm] Vector plots + "zoomier"

[Dave Squires <djsquires@xxxxxxxx>]

Dave,

Arrows for polarity directions
---------------
Very nice. It seems to work well. It just gets busy
as heck if a small grid is specified. Maybe work on
adding an option to display arrows on the contour lines
instead of at grid points so you don't fill the screen
with arrows if you need to reduce the grid for some reason.
Then the arrow density would not change with grid size.
This is OK for now. I am just suggesting to look into
that option for later and add it to the list you now
have for the arrows. No rush.

Improved Zooming
------------------
The zooming in to small gaps now works as I would expect
it. I can specify a grid size of 0.0001 and still zoom
all the way in to set a thin air gap and connect points.
It makes it more realistic for core regions that are
joined as E-I or C-sections or for other cut cores.

Good work man! Nice Job.

Regards,
Dave Squires

David Meeker wrote:
> I've put up patched versions of femme.exe, femmview.exe, beladraw.exe, 
> and belaview.exe at:
>
> http://groups.yahoo.com/group/femm/files/patch.zip
>
> These modified versions implement vector plots of the fields (push the 
> new arrow button on the tool bar of femmview or belaview), and they are 
> also modified so that the view can be zoomed in to better than one 
> millionth of the full-scale geometry, rather than only about one eightieth.
>
> The vectors are just plotted on the grid points at even spacing--you can 
> make more arrows by changing the grid settings. I'd been thinking about 
> plotting arrowheads on the flux lines or something, but it was a lot 
> easier to just put arrows at evenly spaced grid points. The arrows are 
> scaled by default so that the biggest field corresponds to an arrow that 
> is the same length as the current grid spacing. In the edit box that 
> you get when you press the arrow icon, you can change the relative 
> scaling. The program plots the vectors on an element-by-element basis, 
> so that multiple arrows will get plotted at locations where the field is 
> multi-valued (e.g. interfaces between different materials and corners). 
> There are preference settings for the vector plots so that you can have 
> these plots on or off by default, and so that you can change the color 
> of the arrows.
>
> These changes aren't yet incorporated into the release versions 
> available from the website at http://femm.berlios.de -- I'll include 
> these changes to the release versions after I've had a chance get some 
> feedback.
>
> Dave.