# Copyright (c) 2018-2020 Manfred Moitzi
# License: MIT License
import ezdxf
from ezdxf.math import UCS, Vec3
from pathlib import Path
OUT_DIR = Path('~/Desktop/Outbox').expanduser()
doc = ezdxf.new('R2010')
msp = doc.modelspace()
ucs = UCS(origin=(0, 2, 2), ux=(1, 0, 0), uz=(0, 1, 1))
msp.add_arc(center=ucs.to_ocs((0, 0)),
radius=1,
start_angle=ucs.to_ocs_angle_deg(45),
end_angle=ucs.to_ocs_angle_deg(270),
dxfattribs={
'extrusion': ucs.uz,
'color': 1,
})
center = ucs.to_wcs((0, 0))
msp.add_line(
start=center,
end=ucs.to_wcs(Vec3.from_deg_angle(45)),
dxfattribs={'color': 1},
)
msp.add_line(
start=center,
end=ucs.to_wcs(Vec3.from_deg_angle(270)),
dxfattribs={'color': 1},
)
# Copyright (c) 2018 Manfred Moitzi
# License: MIT License
import ezdxf
from ezdxf.math import UCS, Vector
dwg = ezdxf.new('R2010')
msp = dwg.modelspace()
# include-start
ucs = UCS(origin=(0, 2, 2), ux=(1, 0, 0), uz=(0, 1, 1))
msp.add_arc(
center=ucs.to_ocs((0, 0)),
radius=1,
start_angle=ucs.to_ocs_angle_deg(45), # shortcut
end_angle=ucs.to_ocs_angle_deg(270), # shortcut
dxfattribs={
'extrusion': ucs.uz,
'color': 2,
})
center = ucs.to_wcs((0, 0))
msp.add_line(
start=center,
end=ucs.to_wcs(Vector.from_deg_angle(45)),
dxfattribs={'color': 2},
)
msp.add_line(
start=center,
end=ucs.to_wcs(Vector.from_deg_angle(270)),
dxfattribs={'color': 2},
)
# translate location new_wcs_location = actual_wcs_location + translation # convert WCS location to OCS location blockref.dxf.insert = ocs.from_wcs(new_wcs_location) # rotate a block references with an established OCS around the block y-axis about 90 degree ocs = blockref.ocs() # convert block y-axis (= rotation axis) into WCS vector rotation_axis = ocs.to_wcs((0, 1, 0)) # convert local z-axis (=extrusion vector) into WCS vector local_z_axis = ocs.to_wcs((0, 0, 1)) # build transformation matrix t = Matrix44.axis_rotate(axis=rotation_axis, angle=math.radians(-90)) uz = t.transform(local_z_axis) uy = rotation_axis # the block reference origin stays at the same location, no rotation needed wcs_insert = ocs.to_wcs(blockref.dxf.insert) # build new UCS to convert WCS locations and angles into OCS ucs = UCS(origin=wcs_insert, uy=uy, uz=uz) # set new OCS blockref.dxf.extrusion = ucs.uz # set new insert blockref.dxf.insert = ucs.to_ocs((0, 0, 0)) # set new rotation: we do not rotate the block reference around the local z-axis, # but the new block x-axis (0 deg) differs from OCS x-axis and has to be adjusted blockref.dxf.rotation = ucs.to_ocs_angle_deg(0) doc.set_modelspace_vport(5) doc.saveas(OUT_DIR / 'ocs_insert.dxf')
def main():
doc = ezdxf.new('R2010', setup=True)
blk = doc.blocks.new('CSYS')
setup_csys(blk)
msp = doc.modelspace()
# The DXF attribute `rotation` rotates a block reference always around the block z-axis:
# To rotate the block reference around the WCS x-axis,
# you have to transform the block z-axis into the WCS x-axis:
# rotate block axis 90 deg ccw around y-axis, by using an UCS
ucs = ucs_rotation(UCS(), axis=Y_AXIS, angle=90)
# transform insert location, not required for (0, 0, 0)
insert = ucs.to_ocs((0, 0, 0))
# rotation angle about the z-axis (= WCS x-axis)
rotation = ucs.to_ocs_angle_deg(15)
# msp.add_blockref('CSYS', insert, dxfattribs={
# 'extrusion': ucs.uz,
# 'rotation': rotation,
# })
# To rotate a block reference around the block x-axis,
# you have to find the rotated z-axis (= extrusion vector)
# of the rotated block reference:
# t is a transformation matrix to rotate 15 degree around the x-axis
t = Matrix44.axis_rotate(axis=X_AXIS, angle=math.radians(15))
# transform block z-axis into new UCS z-axis (= extrusion vector)
uz = Vector(t.transform(Z_AXIS))
# create new UCS at the insertion point, because we are rotating around the x-axis,
# ux is the same as the WCS x-axis and uz is the rotated z-axis.
ucs = UCS(origin=(1, 2, 0), ux=X_AXIS, uz=uz)
# transform insert location to OCS, block base_point=(0, 0, 0)
insert = ucs.to_ocs((0, 0, 0))
# for this case a rotation around the z-axis is not required
rotation = 0
blockref = msp.add_blockref('CSYS', insert, dxfattribs={
'extrusion': ucs.uz,
'rotation': rotation,
})
# translate a block references with an established OCS
translation = Vector(-3, -1, 1)
# get established OCS
ocs = blockref.ocs()
# get insert location in WCS
actual_wcs_location = ocs.to_wcs(blockref.dxf.insert)
# translate location
new_wcs_location = actual_wcs_location + translation
# convert WCS location to OCS location
blockref.dxf.insert = ocs.from_wcs(new_wcs_location)
# rotate a block references with an established OCS around the block y-axis about 90 degree
ocs = blockref.ocs()
# convert block y-axis (= rotation axis) into WCS vector
rotation_axis = ocs.to_wcs((0, 1, 0))
# convert local z-axis (=extrusion vector) into WCS vector
local_z_axis = ocs.to_wcs((0, 0, 1))
# build transformation matrix
t = Matrix44.axis_rotate(axis=rotation_axis, angle=math.radians(-90))
uz = t.transform(local_z_axis)
uy = rotation_axis
# the block reference origin stays at the same location, no rotation needed
wcs_insert = ocs.to_wcs(blockref.dxf.insert)
# build new UCS to convert WCS locations and angles into OCS
ucs = UCS(origin=wcs_insert, uy=uy, uz=uz)
# set new OCS
blockref.dxf.extrusion = ucs.uz
# set new insert
blockref.dxf.insert = ucs.to_ocs((0, 0, 0))
# set new rotation: we do not rotate the block reference around the local z-axis,
# but the new block x-axis (0 deg) differs from OCS x-axis and has to be adjusted
blockref.dxf.rotation = ucs.to_ocs_angle_deg(0)
doc.set_modelspace_vport(5)
doc.saveas('ocs_insert.dxf')
