Greetings,
I'm still struggling with the use of Alpha in a 2D display
(TwoDDisplayRendererJ3D to be specific). I have a FlatField
(lat,lon)->Alt in a 2D display. I then create a "wedge" shape using
DelaunayCustom.fill and add the shape to the display while setting its
alpha value to 0.5.
ConstantMap[] pointMap = { new ConstantMap (0.0f, Display.Red),
new ConstantMap (0.0f, Display.Green),
new ConstantMap (0.0f, Display.Blue),
new ConstantMap (0.5f, Display.Alpha),
new ConstantMap (4.0f, Display.PointSize) };
DataReferenceImpl widthRef = new DataReferenceImpl("widthRef");
display.addReference(widthRef, pointMap);
widthRef.setData(widthSet);
The wedge is not transparent to the displayed data "below" it. Please see:
http://www.cimms.ou.edu/~kmanross/VCPRPE/VisADSamples/VisADAlphaIssue.gif
The only thing that changing the value for Display.Alpha does it change
the color of the wedge from black (0.0) to white (1.0).
I am hoping for the wedge to behave like the transparent radar echoes do
in Don Murray's 1st two examples:
http://www.unidata.ucar.edu/staff/donm/radar_pics.html
where you can see the state boundaries below the radar echo.
Also, If I translate the displayed image (left click drag) to the upper
left corner, it covers up the cursor readout when the middle button is
clicked. Is there a way that I can ensure that readout remains visible
when data is displayed in that region of the window?
Many thanks!!
-kevin.
--
+------------------------------------------------------------+
Kevin L. Manross [KD5MYD] <>< (405)-366-0557
CIMMS Research Associate kevin.manross@xxxxxxxx
[NSSL-WRDD/SWATN] http://www.cimms.ou.edu/~kmanross
"My opinions are my own and not representative of CIMMS, NSSL,
NOAA or any affiliates"
+------------------------------------------------------------+
