add 'pixel' as unit?

[huangziwei]

Hi,

Sometimes I don't really know the unit of the picture and the axis is turned off for aesthetic reason. It would be nice to have a scale bar just for showing how many pixels a certain length of the picture spanned.

[ppinard]

That's a very good idea. One question about whether to allow prefixes (e.g. npx, mpx, kpx, Mpx)? I guess maybe kpx (kilo-pixel) and Mpx (mega-pixel) make sense for large maps, but prefixes for less than 1 (e.g. micro, nano) would never arise?

[huangziwei]

I guess px, kpx, Mpx will cover most of the use scenarios, while the others can be added by future requests? Actually I never see mpx and npx in real life...

[ppinard]

Sorry the delay. I completely forgot about this issue. The code is in and I will create a new release soon.