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# Copyright (c) 2014-2022, Manfred Moitzi
# License: MIT License
import pathlib
import ezdxf
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows the usage of the LWPOLYLINE entity, which is the default
# 2D polyline entity (LW stands for LightWeight).
#
# docs: https://ezdxf.mozman.at/docs/dxfentities/lwpolyline.html
# circular arc segments: https://ezdxf.mozman.at/docs/dxfentities/lwpolyline.html#bulge-value
# tutorial: https://ezdxf.mozman.at/docs/tutorials/lwpolyline.html
# ------------------------------------------------------------------------------
def create_lwpolyline():
doc = ezdxf.new("R2000")
msp = doc.modelspace()
points = [(0, 0), (3, 0), (6, 3), (6, 6)]
msp.add_lwpolyline(points)
doc.saveas(CWD / "lwpolyline1.dxf")
def append_points_to_lwpolyline():
doc = ezdxf.readfile(CWD / "lwpolyline1.dxf")
msp = doc.modelspace()
pline = msp.query("LWPOLYLINE").first
pline.append_points([(8, 7), (10, 7)])
doc.saveas(CWD / "lwpolyline2.dxf")
def edit_lwpolyline():
doc = ezdxf.readfile(CWD / "lwpolyline2.dxf")
msp = doc.modelspace()
pline = msp.query("LWPOLYLINE").first
# edit by context manager:
with pline.points() as points: # points is a python standard list
# del points[-2:] # delete last 2 points
# points.extend([(4, 7), (0, 7)]) # adding 2 other points
# the same as one command
points[-2:] = [(4, 7), (0, 7)]
# implicit call of line.set_points(points) at context manager exit
doc.saveas(CWD / "lwpolyline3.dxf")
def lwpolyline_width():
doc = ezdxf.new("AC1015")
msp = doc.modelspace()
# Each line segment can have a different start/end width, if omitted
# start/end width = 0.
# point format = (x, y, [start_width, [end_width, [bulge]]])
points = [
(0, 0, 0.1, 0.15),
(3, 0, 0.5, 0.75),
(6, 3, 0.3, 0.35),
(6, 6, 0.4, 0.45),
]
msp.add_lwpolyline(points)
doc.saveas(CWD / "lwpolyline_width.dxf")
def lwpolyline_with_circular_arcs():
doc = ezdxf.new("AC1015")
msp = doc.modelspace()
# LWPolyline can also have curved elements, they are defined by the bulge value.
# point format = (x, y, [start_width, [end_width, [bulge]]])
points = [
(0, 0, 0, 0.05),
(3, 0, 0.1, 0.2, -0.5),
(6, 0, 0.1, 0.05),
(9, 0),
]
msp.add_lwpolyline(points)
doc.saveas(CWD / "lwpolyline_bulge.dxf")
if __name__ == "__main__":
create_lwpolyline()
append_points_to_lwpolyline()
edit_lwpolyline()
lwpolyline_width()
lwpolyline_with_circular_arcs()
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