Posted by LordOfBikes on Aug 15, 2024; 7:02am
URL: https://forum.librecad.org/Properties-command-corrupts-coordinates-rounds-to-6-significant-figures-tp5725226p5725230.html

This has possibly nothing to do with tolerances or reading/writing DXF.

A common issue is to set floating point numbers into a QLineEdit and read it back. This is what happens in the properties dialog. The conversion float -> string -> float is often the cause of such errors.

Of course, this issue is favored by the big coordinate numbers.

When you search the forum, there is a bunch of topics addressing this.
I haven't heard about this properties dialog issue yet, but it fits into the series of issues with surveying applications.
There will be more issues concerning accuracy, finding intersections, snapping and more.
Those arise because of the big ratio between location and entity sizes.

The recommendation is to move the drawing towards the origin.

Armin