Handling of negative values in the statistical-charts?

[Ramkumar KB via ntg-context <ntg-context@ntg.nl>]

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Dear List,

I have been exploring the use of the awesome statistical-charts
<https://akela.mendelu.cz/~thala/statcharts/> module. So first of all, a
big thanks to the authors of the same.

I seem to have hit a snag when it comes to handling of -ve values. In my
example (attached tex & pdf), the y-axis labels and the grids do not seem
to be working on the -ve side (also, able to flip labels above x-axis for
-ve values). This seems to be the case of column charts and bar charts (and
I will test this for the other types of charts also).

If this is a more generic issue across all the types, then I can contribute
towards enhancing it (as any charts module should handle -ve values). Any
tips or pointers would be really helpful.

Thank you very much.

best regards,

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\definepapersize[a4-portrait][A4][A4]
\setupcolors[state=start] % otherwise you get greyscale
\usecolors[crayola]
% for charts and graphs
\usemodule[statistical-charts]
% Setup the section headers
\setuphead[section,chapter,subject][color=black]
\setuphead[section,subject][style={\bf},  before={}, after={}]
\setuppapersize[a4-portrait]
\setuppagenumber[state=stop]
% define layouts
\setuplayout[topspace=10mm,
backspace=15mm,
header=50pt,footer=50pt,
textwidth=165mm,
height=middle,width=middle]

% =============== DOC STARTS HERE ===============
\starttext
\def\unemploydataone{20,17.2,-14.2,29.3,22.5,-18.4}
\def\agelabels{15--24,25--29,30--34,35--44,45--54,55+}

\columnchart[basic]
[xscale=1.1, yscale=0.25,yshift=-6.0,
left=0.5, distance=0.75,
columncolor=tamarange,columntransparency=0.7,
axesunits=yes,xunit=Age, yunit=Number ofunemployed persons (thousands)]
[data={\unemploydataone},xlabels={\agelabels}]

\stoptext

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