picture – Dimens for picture macros

There are macro and en­vi­ron­ment ar­gu­ments that ex­pect num­bers that will in­ter­nally be mul­ti­plied by \unitlength. This pack­age ex­tends the syn­tax of these ar­gu­ments, so that di­men­sions with cal­cu­la­tion sup­port may be used for these ar­gu­ments.