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# Copyright (c) 2010-2022 Manfred Moitzi
# License: MIT License
import pathlib
import random
import ezdxf
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to add block references and automatically create ATTRIB
# entities from ATTDEF templates.
#
# tutorial: https://ezdxf.mozman.at/docs/tutorials/blocks.html
# ------------------------------------------------------------------------------
def get_random_point():
x = random.randint(-100, 100)
y = random.randint(-100, 100)
return x, y
SAMPLE_COORDS = [get_random_point() for x in range(50)]
FLAG_SYMBOL = [(0, 0), (0, 5), (4, 3), (0, 3)]
def main():
doc = ezdxf.new("R2007")
doc.layers.add("FLAGS")
msp = doc.modelspace()
flag = doc.blocks.new(name="FLAG")
# Add DXF entities to the block (the flag).
# Use base_point = (x, y) to define a different base_point than (0, 0).
flag.add_polyline2d(FLAG_SYMBOL)
flag.add_circle(center=(0, 0), radius=0.4, dxfattribs={"color": 1})
# Create the ATTRIB templates as ATTDEF entities:
flag.add_attdef(
tag="NAME", insert=(0.5, -0.5), dxfattribs={"height": 0.5, "color": 3}
)
flag.add_attdef(
tag="XPOS", insert=(0.5, -1.0), dxfattribs={"height": 0.25, "color": 4}
)
flag.add_attdef(
tag="YPOS", insert=(0.5, -1.5), dxfattribs={"height": 0.25, "color": 4}
)
for number, point in enumerate(SAMPLE_COORDS):
# Create the value dictionary for the ATTRIB entities, key is the tag
# name of the ATTDEF entity and the value is the content string of the
# ATTRIB entity:
values = {
"NAME": f"P({number + 1})",
"XPOS": f"x = {point[0]:.3f}",
"YPOS": f"y = {point[1]:.3f}",
}
random_scale = 0.5 + random.random() * 2.0
# This method wraps the INSERT and all the ATTRIB entities into an
# anonymous block, which produces the best visual results, especially
# for non-uniform scaled block references, because the transformation
# and scaling is done by the CAD application.
msp.add_auto_blockref(
"FLAG",
point,
values,
dxfattribs={"layer": "FLAGS", "rotation": -15},
).set_scale(random_scale)
# The example "block_reference_with_attributes.py" shows a different
# method to automatically add ATTRIB entities to INSERT entities.
doc.set_modelspace_vport(height=200)
filename = CWD / "auto_blockref_flags.dxf"
doc.saveas(filename)
print(f"drawing '{filename}' created.")
if __name__ == "__main__":
main()
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