oh the key is upside down in the last image...
detached key is a priority for this afternoon.
Got detached key working in both PNG (an extra image file with extension ".key.png" in place of ".png") and PDF (a second page in the same file) export. Overlay on image is another option, as is having no key at all (the default mode).
I adjusted the dashing patterns for each ray by hand in the GUI, this would be something nice to automate because it's very tedious mouse clickery.
The way I'm showing the text makes it non-selectable in the PDF, need to fix that too... hopefully it's something simple in my use of the Cairo API.
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