Hi Helen-
Helen Yi wrote:
> I have a display in lat31-43 N)-lon(90 W -1 06W) domain , I like to
> overlap MciDAS map on my display and chop-off the map displayed
> outside my domain, that is, only show map information in my display
> domain (31-43N, 90W-106W).
>
> I did the following but the map shows beyond the display region (see
> the DISPLAY+MAP display at http://enso.larc.nasa.gov/~helen )
>
> Is what I did wrong or I miss something?
As Mathias noted, you could use the setLatLonLimits method
of BaseMapAdapter, but this uses a crude algorithm to do the
clipping and must be called before you call the getData() method
of BMA. A better solution is to use the clipping methods
in DataRendererJ*D. Here is a snippet of code from one of
our classes that clips:
/**
* Enable clipping of data at the box edges
* @param clip true to turn clipping on, otherwise off
*/
public void enableClipping(boolean clip) {
if (getDisplayMode() != MODE_2D) {
DisplayRendererJ3D dr
(DisplayRendererJ3D) getDisplay().getDisplayRenderer();
try {
dr.setClip(0, clip, 1.0f, 0.0f, 0.0f, -1.001f);
dr.setClip(1, clip, -1.0f, 0.0f, 0.0f, -1.001f);
dr.setClip(2, clip, 0.0f, 1.0f, 0.0f, -1.001f);
dr.setClip(3, clip, 0.0f, -1.0f, 0.0f, -1.001f);
// clipping on top and bottom of box - do not
//dr.setClip(4, clip, 0.0f, 0.0f, 1.0f, -1.001f);
//dr.setClip(5, clip, 0.0f, 0.0f, -1.0f, -1.001f);
}
catch (VisADException ve) {
System.err.println("Couldn't set clipping " + ve);
}
} else {
DisplayRendererJ2D dr2
(DisplayRendererJ2D) getDisplay().getDisplayRenderer();
if (clip) dr2.setClip(-1.0f, 1.0f, -1.0f, 1.0f);
}
clipping = clip;
}
(getDisplay() is a method in this class that gets the VisAD
display in question).
Don
*************************************************************
Don Murray UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000
(303) 497-8628 Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************
