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
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