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# Re: [femm] Vector plots + "zoomier"

- To: femm@yahoogroups.com
- Subject: Re: [femm] Vector plots + "zoomier"
- From: Dave Squires <djsquires@plix.com>
- Date: Fri, 18 Apr 2003 10:32:36 -0700
- References: <3EA01C2D.5050208@ieee.org>
- User-agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0

`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.`

``
``

- References:
  - Vector plots + "zoomier"
    - From: David Meeker <dmeeker@ieee.org>

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