With the Linear2DSet you've defined, the points are pretty close, maybe
too close for single precision. You could try the double-precision version
of the Set classes.
On 5/19/12 1:33 AM, Tomas Pluskal wrote:
Dear VisAD developers,
We are using VisAD for the visualization of mass spectrometry data as part of
the MZmine 2 framework (http://mzmine.sourceforge.net/).
I found that sometimes the visualization is affected by the range of the axes.
When visualizing a narrow range of data, the plot shows some strange artefacts
such as lines. After a bit of debugging, I managed to write a short Java
program that demonstrates the issue (attached as VisadTest.java)
The program creates a simple Linear2DSet of 1000 x 1000 dimension. The Z values
are set to zero for the whole domain, therefore the visualization only shows a
flat plane. The strange thing is that depending on the range of the X axis, the
visualization is different (note that the resolution of the Linear2DSet stays
The range of the X axis is defined in the program here:
double xMin = 100;
double xMax = 100.007;
I have attached screenshots demonstrating the VisAD behavior as I change the
range of the X axis from 100-100.5 to 100-100.0005. Finer ranges show some
strange patterns instead of solid color. Is this behavior normal? I believe the
visualization should be exactly the same except the X axis label. Is this a bug
PS: I am using the latest VisAD (Thu Mar 22 13:01:31 CDT 2012 Rev:5952),
running Java 1.6.0_31 on Mac OS X 10.7.4.
G0 Cell Unit, Okinawa Institute of Science and Technology Graduate University
1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
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