P is an $N$-by-2 matrix of at least three vertices, implicitly closed. PATTERN names the fill and defaults to 'ANSI31', the 45-degree hatch that means cut material. ANGLE rotates the pattern, in degrees, and SPACING sets the line spacing in millimetres.

Not every backend can render a hatch. DXF R12 has no HATCH entity at all, so a drawing may legitimately carry hatches that the DXF output cannot express; see dxf.write. The model records the intent regardless, which is what lets the backend decide what to do about it.

Source Code: draw.Drawing