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# Copyright (c) 2022, Manfred Moitzi
# License: MIT License
from typing import cast
import pathlib
import ezdxf
from ezdxf.layouts import Paperspace
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to freeze layers in VIEWPORT entities.
#
# VIEWPORT: https://ezdxf.mozman.at/docs/dxfentities/viewport.html
# LAYER: https://ezdxf.mozman.at/docs/tables/layer_table_entry.html
# TUTORIAL: https://ezdxf.mozman.at/docs/tutorials/psp_viewports.html
# ------------------------------------------------------------------------------
MESH_SIZE = 20
COUNT = 7
LAYER_NAME = "L{}"
PAPER_WIDTH = 22
PAPER_HEIGHT = 17
MARGIN = 1
def create_modelspace_content(msp):
x1 = 0
x2 = 100
for index in range(COUNT):
y = index * 10
layer_name = LAYER_NAME.format(index)
# color by layer
# linetype by layer
# linewidth by layer
msp.add_line((x1, y), (x2, y), dxfattribs={"layer": layer_name})
def create_viewports(paperspace: Paperspace):
# Define viewports in paper space:
# center, size=(width, height) defines the viewport in paperspace.
# view_center_point and view_height defines the area in modelspace
# which is displayed in the viewport.
vp_height = 15
vp_width = 3
cx = vp_width / 2
cy = (PAPER_HEIGHT - 2 * MARGIN) / 2
for frozen_layers in [
[], # no frozen layers
["L0", "L1"],
["L2", "L3"],
["l4", "l5", "l6"], # case mismatch
["undefined"], # without layer table entry
]:
vp = paperspace.add_viewport(
center=(cx, cy),
size=(vp_width, vp_height),
view_center_point=(50, 30),
view_height=70,
status=2,
)
vp.frozen_layers = frozen_layers
cx += vp_width + MARGIN
def main():
def make(dxfversion):
doc = ezdxf.new(dxfversion, setup=True)
msp = doc.modelspace()
# create the default layer for VIEWPORT entities:
vp_layer = doc.layers.add("VIEWPORTS")
# switch viewport layer off to hide the viewport borderlines
vp_layer.off()
for index in range(COUNT):
doc.layers.add(LAYER_NAME.format(index))
create_modelspace_content(msp)
psp = cast(Paperspace, doc.layout("Layout1"))
psp.page_setup(
size=(PAPER_WIDTH, PAPER_HEIGHT),
margins=(MARGIN, MARGIN, MARGIN, MARGIN),
units="inch",
)
create_viewports(psp)
doc.set_modelspace_vport(60, (50, 30))
filename = f"viewport_frozen_layers_{dxfversion}.dxf"
try:
doc.saveas(CWD / filename)
except IOError as e:
print(str(e))
make("R2000")
make("R2007")
make("R2018")
if __name__ == "__main__":
main()
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