Re: A simple question

Hi Ricardo,

> I have a simple question about coordinate systems conversion.   I want
> to know how to convert a window X coordinate into graphic display
> coordinates.  I spent some time looking for the answer but I couldn't
> find it.

Given window coordinates x and y, you can do something like this:

  DisplayImpl display = . . .
  DisplayRenderer dr = display.getDisplayRenderer();
  MouseBehavior mouse = dr.getMouseBehavior();
  VisADRay ray = mouse.findRay(x, y);

In a 2-D display, the x and y graphics coordinates are
just ray.position[0] and ray.position[1].  In a 3-D display
it is more complex - the ray position and vector define
a ray that generally runs obliquely through the 3-D
graphics coordinate system.  Note that you'll need a new
copy of VisAD to use the DisplayRenderer.getMouseBehavior()

Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738

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