Autocad doesn't automatically render hatches

[amoudaria]

I added hatches in .pat in support folder, but when I use this hatches in script, Autocad render it as ANSI31

[mozman]

I don't understand what you did, but adding a pattern file to a directory doesn't do anything. Hatch pattern are stored in the HATCH entity and this tutorial shows how to do that.

[mozman]

The following script shows how to load patterns from a .pat files:

import ezdxf
from ezdxf.tools import pattern
from ezdxf import zoom

EXAMPLE = """; a pattern file

*SOLID, Solid fill
45, 0,0, 0,.125
*ANSI31, ANSI Iron, Brick, Stone masonry
45, 0,0, 0,.125
*ANSI32, ANSI Steel
45, 0,0, 0,.375
45, .176776695,0, 0,.375
*ANSI33, ANSI Bronze, Brass, Copper
45, 0,0, 0,.25
45, .176776695,0, 0,.25, .125,-.0625
*ANSI34, ANSI Plastic, Rubber
45, 0,0, 0,.75
45, .176776695,0, 0,.75
45, .353553391,0, 0,.75
45, .530330086,0, 0,.75
"""

def load_pattern_from_file():
    doc = ezdxf.new("R2010")  # create a new DXF drawing (AutoCAD 2010)
    msp = doc.modelspace()  # we are working in model space
    hatch = msp.add_hatch()  # by default a SOLID fill
    # load your pattern file from the file system as string:
    # with open("pattern_file.pat", "rt") as fp:
    #      EXAMPLE = fp.read()
    patterns = pattern.parse(EXAMPLE)

    hatch.set_pattern_fill(
        "MyPattern",
        color=7,
        angle=0,
        scale=1.0,
        style=0,
        pattern_type=0,
        # pattern name without the preceding asterisk
        definition=patterns["ANSI34"],  
    )
    points = [(0, 0), (10, 0), (10, 10), (0, 10)]
    hatch.paths.add_polyline_path(points)
    msp.add_lwpolyline(points, close=True, dxfattribs={"color": 1})
    zoom.extents(msp)
    doc.saveas("loaded_pattern_from_file.dxf")

if __name__ == "__main__":
    load_pattern_from_file()