What are /r/Veusz's favorite Products & Services?

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In the manual you can read (page 9): "Veusz allows dates and times to be formatted using %VDX where X is one of the formatting characters for strftime"..." These include"..."H hour as 00..23"..."M minute as 00..59". So, with that in mind I tried with "%VDH%VDM" (without quotes) in the Format field of the Tick labels formatting of the X axis. It works as expected. I think it's worth mentioning that I imported data from CSV and I set X values as date-time when importing (so Veusz knows it is a date/time and not a label or a numeric field).

I didn't found any pie chart related examples on the Veusz example page, therefore I think that is not a function of veusz.
I mean there could be workarounds such as calculating the fractions manually and plotting them in polar coordinates, but to be honest I don't think it's worth it.

LibreOffice Calc should be able to do pie charts if you really need one.

There's also the function plotting widget for plotting a function surface directly, or a function in 3d coordinates.

Veusz 2D datasets have an associated binning, so when you construct it you need to provide the xrange/yrange or xgrid/ygrid options: https://veusz.github.io/docs/manual/api.html#setdata2d

For the colormap, you need to provide a 2D dataset giving the color value (default 0 to 1) under the "Color data" setting.