[PerlChina] GD Graph for placing Y axis help

Hello everyone, I have some problems to use GD::Graph::lines. I want
to place the Y axis at the middle of the X axis( the axis for x values
of 0, my X axis is numeric, from negative value to positive
value) ,but i couldn't found any GD functions for this purpose. Are
there any functions like zero_axis and zero_axis_only in GD module to
draw the axis for x values of 0 or similar functions in other perl
modules to do this job.Thanks!
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