Re: setScaleEnable

• To: brechtjo@xxxxxxx
• Subject: Re: setScaleEnable
• From: "From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>" <billh@xxxxxxxxxxxxx>
• Date: Sat, 11 Dec 1999 06:47:58 -0600 (CST)

Hi John,
 
Since I recall you are using the SpreadSheet, let me further
explain my last message in terms of the SpreadSheet.
 
Say for example that you import visad/ss/cancel.gif into cell A1.
It will have MathType:
 
  ((ImageElement, ImageLine) -> (Red, Green, Blue))
 
If you want to see surfaces for both Red and Green values
you might try mappings:
 
  ImageElement -> XAxis
  ImageLine -> YAxis
  Red -> ZAxis
  Green -> ZAxis
 
But this would give the error you reported yesterday:
 
  Single DisplayRealType DisplayYAxis occurs more than once:
  ShadowType.testIndices
 
You can fix this by entering the formula:
 
  link(visad.Tuple.makeTuple(extract(A1, 0), extract(A1, 1))
 
into another cell, which will create a data object with MathType:
 
  (((ImageElement, ImageLine) -> Red)), ((ImageElement, ImageLine) ->
Green)))
 
and now the display mappings above will work.
 
Please note that the SpreadSheet does not yet (my oversight) have
an intrinsic syntax for constructing Tuples, so my formula will
only work after you add the following static function to
visad/Tuple.java:
 
  public static Tuple makeTuple(Data[] datums)
         throws VisADException, RemoteException {
    return new Tuple(datums);
  }
 
This addition will be in the next update of the VisAD source
distribution, and we'll add a syntax for constructing Tuples
soon.
 
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