Re: better method for setting Cartesian aspect ratios

• To: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Subject: Re: better method for setting Cartesian aspect ratios
• From: Doug Lindholm <lind@xxxxxxxx>
• Date: Mon, 27 Nov 2000 10:34:26 -0700

Hi,

Thanks, this is a huge help! 

Me thinks I found a bug. If I call setAspect2 before I add data to the
display, the data are not positioned properly. Let me know if you'd like
me to send some sample code.

Thanks,
Doug

Bill Hibbard wrote:
> 
> There are now two methods in ProjectionControl for setting
> aspect ratio:
> 
>   public void setAspect(double[] aspect)
>          throws VisADException, RemoteException;
> 
>   public void setAspect2(double[] aspect)
>          throws VisADException, RemoteException;
> 
> The first is the same implementation that has been available
> previously.  This has the negative affect of squashing text
> and other line graphics, and making unrealistic normals for
> shading.
> 
> The second eliminates the negative affects.  Note however it
> is only appropriate for displays with ScalarMaps to XAxis,
> YAxis and ZAxis.  Displays based on spherical and other non-
> Cartesian spatial coordinates are unaffected by setAspect2().
> 
> I have changed Test57.java and Test58.java in visad/examples
> to use setAspect2().  Note that Test57.java actually combines
> both methods:
> 
>       control.setAspect2(new double[] {2.0, 1.0, 0.5});
>       control.setAspect(new double[] {0.5, 0.5, 0.5});
> 
> Passing aspect numbers larger than 1.0 to setAspect2() avoids
> text collisions in axis scales, then passing three identical
> values (i.e., 0.5) to setAspect() scales the scene to fit in
> the window.
> 
> Cheers,
> Bill
> ----------------------------------------------------------
> Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
> hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
> http://www.ssec.wisc.edu/~billh/vis.html

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• References:
  • better method for setting Cartesian aspect ratios
    • From: Bill Hibbard