Delaminating the Onion, OGR style

 After I learned about geospatial PDF documents with layers of GIS "goo" embedded I've tried out maps and similar graphics for events and travel. New challenge--having a layered PDF for a theater stage floor plan. The idea came when I found first one, then a different paper drawing, detailed but lacking those "mechanical drawing" features such as a title block, date, scale, source, things like that.

New version, showing 3 of 8 layers

The old drawings could have come from Corel Draw for all I know.

I wanted to use LibreOffice Draw if possible, to create a layered PDF, as I've learned how to do most of what I could do with MS Visio. The above image is the fix for dimensions in Imperial units that show up as "10.01 feet" for unknown reasons. Truncating to 1 decimal place makes it better as "10.0 feet."

Here's one with a rounding error, and also a scaling error as the scale "rod" should be 10 feet, not 9 and a half-ish.

The ODG, seat numbers and scan layers were supposed to have boxes to check if that layer was included in the view. 

But no, while the LibreOffice drawing can manage internal layer juggling, writing a PDF with defined layers does not work.

https://bugs.documentfoundation.org/show_bug.cgi?id=138142

Bug 138142 - "Draw should have an option to export to PDF keeping separate layers"

A workaround posted here:

https://graphicdesign.stackexchange.com/questions/169487/how-to-export-a-drawing-odg-file-from-libreoffice-25-8-to-a-multi-layered-pdf-f 

Load the ODG file into Scribus, then export to a layered PDF. It works, but only to a degree, as the layers get shuffled and renamed.

Extra layers can be added in Scribus, so I chose to do the measured baselines (aisles etc.) in ODG and the icing of title blocks and guides for lining out skewed scanned of paper drawings in Scribus.

I've also added an SVG layer from Inkscape.

Looking at an imported JPEG is awful from Scribus. But the PDF looks fine.

Layers and more

Almost had an issue with "back-loading" a Scribus file on Windows 1.6, after creating a document in NetBSD with 1.7. So I'll use the higher version and save as" a lower if anyone needs to look for themselves.

The scans ended up slightly different in shape, added to the task of alignment.

 

 

Embellishing with seat designs and numbers in Inkscape turned out to be a bigger task than imagined. For one thing, the web site has a dark theme, but printing the images for human note-taking needs a light theme, as these are.

The seat counts differ between the two, I finally noticed also.