A niche but powerful method involves converting DXF to a linetype (LIN file) via MKLTYPE in AutoCAD, then using complex linetypes with shapes (SHX). However, this is extremely convoluted. Stick to DXF > PAT directly.
A standard hatch pattern definition consists of a header and one or more line descriptor lines. The syntax generally follows this structure:
*Pattern_Name, Pattern_Description
Angle, X-Origin, Y-Origin, X-Offset, Y-Offset, [Dash1, Gap1, Dash2...] dxf to pat
When converting a DXF drawing to a PAT file, the software or user must interpret the DXF geometry to satisfy these parameters:
Each line segment in the DXF belongs to a family of parallel, equally spaced lines that repeat within the tile.
Algorithm summary: A niche but powerful method involves converting DXF
| Tool | Method | Features | |------|--------|----------| | AutoCAD (Hatch command) | Manual | Export selected closed boundary as pattern (limited). | | HatchKit (TerraVerde) | Dedicated converter | Imports DXF, automatic tiling, supports arcs, preview. | | PatternMaker for Windows | Semi-automatic | Converts DXF lines to PAT, manual adjustment of periods. | | Python + ezdxf + custom script | Programmatic | Full control, open-source, requires programming. | | QCAD Pro | Built-in | Pattern export from selection, limited to simple tiles. | | FadeIn (for textile design) | Niche | Converts DXF weave structures to PAT. |
Developed by Autodesk in 1982, the Drawing Exchange Format (DXF) is an open-source vector file format. It is the "universal donor" of the CAD world. Here is the translation:
For the purists, or if you need to debug a pattern, it helps to understand what a PAT file actually looks like.
If you open a .pat file in Notepad, you will see something that looks like a foreign language. Here is the anatomy of the code:
*MyCustomPattern, My Custom Brick Pattern
90, 0,0, 0,1, 1,-1
Here is the translation:
To convert a DXF manually, you essentially calculate these coordinates for every line in your drawing. As you can imagine, this is math-heavy for complex patterns, which is why software tools are preferred for DXF-to-PAT conversion.