[Libreoffice] [Calc] Feature Request - charts : error bars + broken axes

[Patrick Gerin]

Dear Developers,

In case this list is not the best suited for the present request, please,
let me know the address to that I should better use.

Owing to all the feature already included, the Chart tool in Calc is very
close to be a good alternative to specialised scientific graph softwares
(like Origin, Sigmaplot, Kaleidagraph...). However, some features that are
important for scientific graphs are still lacking. I would suggest to
include in Calc/charts the additional features detailled below (order of
decreasing importance). With these additional features (and mostly the first
one), I think LibreOffice can also become a reference graph software.

1. X-error bars for XY scatter plots
======================
Just like the Y error bars, but for X-values (horizontal instead of
vertical)



2. Broken axis option (both X and Y axes)
================
Possibility to have 2 different scales zones on the same axis (examples
below):
axis scale from m1 to m2, then break, then axis continuing from m3 to m4,
with scales that can be different in the 2 zones [m1,m2] & [m3,m4] (with
m1<m2<m3<m4).
e.g. axis of 10 cm long, scale value -10 at 0cm, scale value 10 at 4 cm,
break label at 4.2 cm, scale value 100 at 4.5 cm, scale value 2000 at 10 cm
(so the scales are different in the zone 0-4 cm and in the zone 4.5-10 cm of
the same axis)

Data to be defined by the user in the Format axis / Scale dialog box :
 + minimum of axis zone A: m1
 + maximum of axis zone A: m2
 + principal intervals zone A
 + secondary intervals zone A
 + break position (position in mm on the axis or % of full axis length)
 + minimum of axis zone B: m3
 + maximum of axis zone B: m4
 + principal intervals zone B
 + secondary intervals zone B

Data have to be managed so that none is plotted in the break area.

This option is important for XY scatter plot (X and Y axis), but can be
quite useful for all other chart types (Y axis), excepted pie charts

Examples:
http://www.originlab.com/www/Products/images/Date_Axis_plot_with_XY_break_500px.png
http://www.igorexchange.com/node/547?size=_original
http://old.nabble.com/attachment/30746972/0/broken_axis.png
http://peltiertech.com/Excel/pix1/BrokenY11.gif :



3. Y-error bar for Net chart
====================
Y-error bar option in the Net chart: error bar inclined depending on the
position of the data on the chart.



=====================

I have no competence to develop these features myself, but I can help as a
user.
Thank you in advance,

Best regards,

Patrick
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/libreoffice/attachments/20110808/3003e9b6/attachment.htm>