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()
method.
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
