Complex Linetype Support (Batting)?

[mostl33]

Hi there!

First thanks for this great module! The featureset is kinda insane 👌 (in the good way) 😀.

Now a tiny question:

Is is possible to use "complex" linetypes with the SVG-Backend? Currently I looking for way to represent a insulation "pattern" in my SVG (e.g. "Batting").

Something like this:

Best regards & and Thanks (!)
ml

[mozman]

No, complex linetypes are not supported by the drawing add-on.

From my experience as a professional CAD designer, such patterns often have a problem with non-rectangular ends and miters in general. This is particularly difficult to control in an automatically generated drawing.

[mozman]

Here's a script you can play around with. As you can see, solving the beginning and end of the pattern is not so easy:

import ezdxf
from ezdxf.math import Vec2


def insulation_pattern(
    radius: float, height: float, count: int = 10
) -> list[tuple[Vec2, float]]:
    pattern: list[tuple[Vec2, float]] = []
    a = height / 2 - radius
    pen = Vec2(radius, -a)
    step1 = Vec2(-radius, 2 * a)
    step2 = Vec2(2 * radius, 0.0)
    step3 = Vec2(-radius, -2 * a)

    for _ in range(count):
        pattern.append((pen, 0.0))
        pen += step1
        pattern.append((pen, -1.0))
        pen += step2
        pattern.append((pen, 0.0))
        pen += step3
        pattern.append((pen, 1.0))
        pen += step2
    return pattern


def main():
    doc = ezdxf.new()
    msp = doc.modelspace()
    msp.add_lwpolyline(insulation_pattern(radius=5, height=20, count=10), format="vb")  # format=(vector, bulge)
    doc.saveas("insulation.dxf")

if __name__ == "__main__":
    main()

[mostl33]

Oh I see.

Thanks a lot for the example 🙏. We're currently evaluating the usage of ezdxf for visualizing layer structures (= a basic dxf to svg converter, not using complex geometries just rectangles, allowing architects to visually define layer structures using a based tool).

Thanks a lot for the library and the example code !

Best regards
ml