Re: Gridded2DSet for a irregular grid / geometry of points

  • To: Sven Laude <sven.laude@xxxxxx>
  • Subject: Re: Gridded2DSet for a irregular grid / geometry of points
  • From: Bill Hibbard <billh@xxxxxxxxxxxxx>
  • Date: Sat, 6 Apr 2002 16:53:24 -0600 (CST)
Hi Sven,

> i have a function (x,y) -> (color) and use it as a background for a
> diagramm. now i try to transform this background for a diagramm with
> logarithmic axisis. that means i need a grid with irregular distances. the
> gridded2dset i used had either the wrong length or the wrong dimension or
> was useless in an other way. i have no idea how to go on. please help! (may
> be with same code?)

Gridded2DSets allow arbitrary goemetry (with 2-D checkerboard
topology), so your problems are probably just errors in the
details of how you are constructing your Gridded2DSets.

> an other question is the geometry of the points in visad. do they have to
> be squared or are there other forms. and is it possible to center the
> points on the coordinates? if i try to pick a point near many others
> it  could help if the center of the point would be the best place for.

You might be able to fix this by adding a ScalarMap of a
RealType to Shape and setting a VisADQuadArray in the
ShapeControl, properly centered.

Good luck,

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