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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
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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" +------------------------------------------------------------+
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