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# Re: Vector plots + "zoomier"

- To: femm@yahoogroups.com
- Subject: Re: Vector plots + "zoomier"
- From: "David Meeker" <dmeeker@ieee.org>
- Date: Thu, 24 Apr 2003 14:39:55 -0000
- In-reply-to: <b8631t+7s0o@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "Aakash Jariwala" <sthu111@y...> wrote:
    > The vector plots are a nice addition. Has anyone run into the
    > problem of zooming into a point that is connecting two lines at a
    90
    > degree angle and one of the lines disappears(it takes the same line
    > every time and seems only to affect lines that are nearly
    > perpendicular to each other)? Is that due to a tolerance setting of
    > the drawing or setting in the program? Thanks.
    >
    > - Aakash Jariwala

    Arrgh. This is how this issue that I had described with the built-in
    GDI only dealing with values of less than 16 bits manifests itself--
    by messing up the way that lines are drawn. I changed things so that
    internally, all lines get cropped to a circle that is 32767 in
    diameter--apparently, this doesn't get rid of the problem in all
    cases. I'll do some more head-scratching to try to get rid of this--
    it would probably be sufficient to crop things to the smallest circle
    that contains the screen.

    I'll also look into the "duplicated points" thing--I hadn't run
    across this before.

    Dave.
    --
    David Meeker
    http://femm.berlios.de/dmeeker

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    - From: "Aakash Jariwala" <sthu111@yahoo.com>

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