This patch enables the user to move the zeroaxes away
from zero. To plot the xzeroaxis at y = 3, use
set xzeroaxis at 3
To plot in the center of the graph, use
set xzeroaxis at graph 0.5
In 3D, two numbers have to be given:
set zzeroaxis at 3,4
plots the z zeroaxis at x=3, y=4.
This is useful to plot axes with ranges that do not
include zero or for log scaled axes.
This patch still is a little bit experimental. Please
give feedback. I do not know what has to be done with
boxes when the zeroaxis is not at zero. Do they still
have to start at zero or at the zeroaxis?
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