[vtkusers] How plot some points those x value be negative useing vtkXYPlotActor?

[孟玮 谢]

 Hi,everyone:
    I use vtkXYPlotActor plot a set of curves.But i
find the point cann't show when those points' x value
are negative.Why?How plot some points those x value be
negative useing vtkXYPlotActor?Can you help me?
     Thank you very much!

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