Solid quadrilateral is not drawing correclty

[johnthagen]

Running ezdxf 0.16.2

import ezdxf

doc = ezdxf.new("R2013")
msp = doc.modelspace()
msp.add_solid([(0.0, 0.0), (0.0, 10.0), (10.0, 10.0), (10.0, 0.0)])
doc.saveas("out.dxf")

I would expect this to render as a square, but when I open it in eDrawings Viewer or Autodesk DWG TrueView, it renders as an hourglass shape instead:

Am I doing something incorrectly? Solid's don't seem to have the close parameter like add_polyline2d or Hatch.paths.add_polyline_path, that I've used before, so perhaps I'm misinterpreting how Solid is supposed to work?

[mozman]

Because ezdxf is an DXF interface, it writes the vertices as the DXF format stores the vertices, the last two vertices have to be reversed. This is a design decision done by Autodesk.

[mozman]

Added addtional documentation to SOLID and TRACE:

The SOLID entity stores the vertices in an unusual way, the last two vertices are reversed. The coordinates [(0, 0), (1, 0), (1, 1), (0, 1)] do not create a square as you would expect:

Reverse the last two vertices to get the expected square: [(0, 0), (1, 0), (0, 1), (1, 1)]

[johnthagen]

The new docs are great, thank you!