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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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.
To learn about what's going on, see About the Archive Site.
VisADders,I'm back with another question on using VisADLineArray to make histogram bars. In previous episodes (about a month back), with help from Bill, Tom and Ugo, I've created a vertical bar, attached it to a vertical ScaleMap, so that its length is determined by the variable on that axis. What I don't understand is how this length is determined: if I have a little line (in Jython)
# Idea from Ugo pBarMap = ScalarMap(intensity, DisplayShape) pBarScaleMap = ScalarMap(intensity, DisplayShapeScale) pBars = VisADLineArray() pBars.vertexCount = 2 x = 1.0 pBars.coordinates = [ 0.0, 0.0, 0.0, 0.0, x, 0.0] pBarScaleMap.setRange(0.0, x/2.0) # Scale as recommended by Bill H.I would expect that when this line is scaled, the first vertex should remain unchanged at [0.0, 0.0, 0.0]. Instead, there appears to be some vertical translation as well as scaling, so that the scaled lines no longer begin at the horizontal axis, but instead float at a height related to the intensity value to which they are mapped - they not only get bigger as the intensity increases, they also "float" higher.
I'd would *really* appreciated any insight you guys can offer. Thanks. -Frank PhD, Computational Biologist, Harvard Medical School BCMP/SGM-322, 250 Longwood Ave, Boston MA 02115, USA.Tel: 617-432-3555 Fax: 617-432-3557 http://llama.med.harvard.edu/~fgibbons
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