There are two different versions. The first one uses pixel measurements like you said the other one uses a fractions of the window. If it is something requested

There are two different versions. The first one uses pixel measurements like you said the other one uses a fractions of the window. If it is something requested then it is something that can be changed quite easily either by me if the feature is requested or the user since it only requires modifying one function. Furthermore for input you only provide your input data the library does not control it and the output can be scaled if required.