Built-in ruler that measures relative distances between locations and perhaps angles in the pdf viewer similar to the feature in Inkscape. Inkscape provides an option for creating a .pdf_tex file that contains text that overlays a diagram or image in pdf through the use of the picture environment. But the placing of the text is hit and miss. A built-in ruler in the pdf viewer would help the fine tuning significantly. I currently use a third-party ruler for the purpose. Ruler unit options should be standard LaTeX units.
Environment
Expected behavior
Built-in ruler that measures relative distances between locations and perhaps angles in the pdf viewer similar to the feature in Inkscape. Inkscape provides an option for creating a .pdf_tex file that contains text that overlays a diagram or image in pdf through the use of the picture environment. But the placing of the text is hit and miss. A built-in ruler in the pdf viewer would help the fine tuning significantly. I currently use a third-party ruler for the purpose. Ruler unit options should be standard LaTeX units.
Actual behavior
How to reproduce