Hi Henner,
> hi again and thanks for your answer bill , ...
> but i have to ask again.
>
> >There are a couple of ways to create custom axis labels:
>
> >1. Extend visad.java3d.DefaultDisplayRendererJ3D, and override its
> >createSceneGraph() method to create your labels as part of your
> >"box".
>
> hm, sorry, but i have absolutely no idea how to do this. i already
> took a look at the source code, but it didn't really help me. ok, i would
> call super.createSceneGraph() in my subclass before doing something, but...
In this approach, you would create a new class like:
public class MyDisplayRenderer extends DefaultDisplayRendererJ3D {
public BranchGroup createSceneGraph(View v, TransformGroup vpt,
VisADCanvasJ3D c) {
. . .
LineArray box_geometry = new LineArray(my_number_of_vertices,
LineArray.COORDINATES);
box_geometry.setCoordinates(0, my_box_verts);
. . .
}
}
where the code is identical to the code from DefaultDisplayRendererJ3D
except you construct your own my_box_verts. I recommend instead the
second approach:
> >2. Create your labels as VisADLineArrays and put them in
> >ShapeControls for some RealType mapped to Display.Shape. There's
> >an example in visad/bom/TrackManipulation.java.
> >
> >In a DisplayImplJ3D the "box" spans X, Y and Z coordinates from
> -1.0
> >to 1.0. You can use the visad.PlotText.render_label() method to
> >help you draw text for your labels.
>
> yes, i think i understood this, it's the creation you mentioned in
> point one -isn't it?
> but how dow create them "as part of my box"? i also don't know what
> realtype i should use for mapping.
> i tried the one i already mapped to the xaxis, but the labels where
> plotted at the position of the data, of course. also a dummy realtype
> doesn't really work, because they always seem to be plotted with a fixed y
> value, so they don't stay on the x-axis when the plot is zoomed.
You will either need to encode the proper X, Y and Z offsets into the
geometry of the VisADLineArrays, or use a RealTuple with RealTypes
mapped to XAxis, YAXis and ZAxis, plus a RealType mapped to Shape.
What you are asking to do is a bit complex. I recommend spending
some time studying existing programs that use Shape, such as
visad/bom/TrackManipulation.java, visad/examples/Test47.java
and visad/rabin/Rain.java.
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
