Hi Gaoming,
> Sorry for asking this question again. I followed instructions from Bill and
> Don, and I used the following code (partial list) to draw some
> texts.
>
> RealType shape = new RealType("shape");
> ScalarMap shape_map = new ScalarMap(shape, Display.Shape);
> display.addMap(shape_map);
>
> RealTupleType coord_type = new
> RealTupleType(longitude,latitude,elevation,shape);
>
> double[] start = {0.0, 0.0, 0.0};
> double[] base = {0.3, 0.0, 0.0};
> double[] up = {0.0, 0.3, 0.0};
> boolean center = false;
>
> PlotText pt = new PlotText();
>
> VisADLineArray shape1 = pt.render_label("My text is here", start, base, up,
> center);
> //shape2
> //shape3
> VisADGeometryArray[] shapes = new VisADGeometryArray[]
> {shape1,shape2,shape3};
> ShapeControl shape_control = (ShapeControl) shape_map.getControl();
> shape_control.setScale(0.2f);
> shape_control.setShapeSet(new Integer1DSet(3));
> shape_control.setShapes(shapes);
>
> I also used the following code to specify the location for the text and add
> the shapes to display:
>
> RealTuple coord_tuple = new RealTuple(coord_type, new double[]
> {samp2[0][0],samp2[1][0],fResult2[0],0});
> DataReferenceImpl ref_coord_tuple = new DataReferenceImpl("ref_coord_tuple");
> ref_coord_tuple.setData(coord_tuple);
> display.addReference(ref_coord_tuple,streetColor);
>
> The code worked for me. The text is displayed at the given location (in this
> case, samp2[0][0],samp2[1][0],fResult2[0])as we can see from Test
> 45 and Test 69, i.e., the text is dsiplayed parallel to x-axis and I can read
> it as output from any System.out.println.
>
> Now, I want to display the text with any specific angles to x, y and z axis.
> for example, I want to display text with 50 degrees to x-axis,
> 100 degrees to y-axis, and 260 degrees to z-axis. I do not know how to set
> start, base and up in this case.
Use:
double[] start = {0.0, 0.0, 0.0};
since the text location comes from your data. Then set 'base'
to a 3-vector in the direction you want your text to run.
Set 'up' perpendicular to 'base', to define the up direction
of your characters. Just experiment with it, and you'll figure
it out.
Good luck,
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
