| Re: Plot 3-D markers in iPlot [message #51263] |
Fri, 10 November 2006 11:10  |
K. Bowman
Messages: 330
Registered: May 2000
|
Senior Member |
|
|
In article <MPG.1fbe5b8c54f63e1d989db1@news.frii.com>,
David Fanning <news@dfanning.com> wrote:
> I'm not sure you will be any more enlightened when Ronn's
> book arrives, at least with respect to how to do this with
> an iTool. It's fairly straightforward to do it with object
> graphics, however. In fact, we were having this discussion
> just a day or so ago in a thread entitled "3D plotting".
> The example I showed used a Rick Towler object named
> RHTgrPSolid to produce a 3D tetrahedron that I used
> as symbols in that scatterplot.
Yes, I had already found that, but was not clear on how to get
a symbol object into an iTool. A lot of trial and error led to
this, which will work for me:
x = [0.0, 10.0] ;Make some test data
y = x
z = x
iPlot, x, y, z, /NO_SAVEPROMPT ;iPlot the data
itool_id = itGetCurrent(TOOL = itool_obj) ;Get the iTool object identifier
orb_obj = OBJ_NEW('orb', COLOR=[240,0,0], STYLE=1, DENSITY=3.0) ;Make an orb object
orb_obj -> Scale, 1.0, 1.0, 1.0/0.7 ;Undo default 3-D scaling (z = 70%)
symbol_obj = OBJ_NEW('IDLgrSymbol', orb_obj, Size=[0.25, 0.25, 0.25]) ;Make a symbol object
polyline_obj = OBJ_NEW('IDLgrPolyline', [4.0, 5.0], [4.0, 5.0], [4.0, 5.0], $ ;Create a polyline object with symbols
LINESTYLE = 6, SYMBOL = symbol_obj)
data_space_id = itool_obj -> FindIdentifiers('*DATA SPACE', /VISUALIZATIONS) ;Find the data space id
data_space_obj = itool_obj -> GetByIdentifier(data_space_id) ;Find the data space object reference
data_space_obj -> Add, polyline_obj ;Add the polyline to the data space
So, I can create an orb object and use that to make a symbol object.
A symbol object cannot be plotted directly (as best I can see), but
it can be used as the marker for a polyline. The polyline can be added into
the iTool's data space.
Since a polyline has to have at least two points, it is not possible
to plot a single symbol. Of course, the end points can be the same point.
This seems slightly silly to me, but there you go.
Ken
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
