import math
import ezdxf
from ezdxf.math import UCS
doc = ezdxf.new('R2010')
msp = doc.modelspace()
# using an UCS simplifies 3D operations, but UCS definition can happen later
# calculating corner points in local (UCS) coordinates without Vector class
angle = math.radians(360 / 5)
corners_ucs = [(math.cos(angle * n), math.sin(angle * n), 0) for n in range(5)]
# let's do some transformations by UCS
transformation_ucs = UCS().rotate_local_z(math.radians(15)) # 1. rotation around z-axis
transformation_ucs.shift((0, .333, .333)) # 2. translation (inplace)
corners_ucs = list(transformation_ucs.points_to_wcs(corners_ucs))
location_ucs = UCS(origin=(0, 2, 2)).rotate_local_x(math.radians(-45))
msp.add_polyline3d(
points=corners_ucs,
dxfattribs={
'closed': True,
'color': 1,
}
).transform_to_wcs(location_ucs)
# Add lines from the center of the POLYLINE to the corners
center_ucs = transformation_ucs.to_wcs((0, 0, 0))
for corner in corners_ucs:
msp.add_line(
def test_shift_ucs():
ucs = UCS()
ucs.shift((1, 2, 3))
assert ucs.origin == (1, 2, 3)
ucs.shift((1, 2, 3))
assert ucs.origin == (2, 4, 6)