Unit confusion.

[wmarais]

Hi

I'm using DrawIO 16.5.1 with metric units (mm) on an A3 page in landscape orientation. The grid is defined in 2.5mm intervals, so every 4rth line gives you a 10mm cell.

When I draw a horizontal line end-to-end with a 10mm margin, I get very strange numbers in the "Arrange" tab for the line.

I would expect the start and end potions to read as (10, 10) to (410, 10). Instead I get (40, 40) to (1614, 40). Even assuming a random scaling factor of 4, I still can calculate the how 410 equates to 1614. I also tried doing a "pt" to "mm" conversion with incorrect results.

Can anyone explain how this works? I.e. if I want to draw a mm accurate drawing, what equation do I need to convert from mm to / from vertices?

I also attached this drawing. On a slightly unrelated note, is it possible to define the origin to start in the centre of the document? This makes it a lot easier to centre drawings.

Example Drawing.zip

Cheers
-Vinnie