On 04/05/2013 04:26 AM, Steven hunyady wrote:
Now I'd like to use embedded Veusz in a python program that captures the live
data itself. I added and modified the embedded example but my lack of
knowledge about Veusz and python has me puzzled about how to manipulate the
datasets. I'm currently using ImportString() to get one line of data at a
time (and veusz plots this one point), but I don't know how to append to this
data (instead of replacing it) when the next line is obtained.
You could keep a cumulative string, which you append the new line to,
and keep passing this to ImportString. However, this is probably much
less efficient than converting the data to numbers yourself and using
SetData, e.g.
datax = []
datay = []
for line in fileobject:
parts = line.split()
datax.append( float(parts[0]) )
datay.append( float(parts[1]) )
SetData('x', datax)
SetData('y', datay)
SetData avoids reconverting the data each time, creating temporary
copies of the data during parsing, and building up a very long string.
SetData has options for error bars. There is SetData2D for 2D datasets.
Hope this helps
Jeremy
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