"""The 3D-ruler axes and a goniometer"""
from vedo import *

settings.use_parallel_projection = True  # avoid parallax effects

mesh = Cone().rotate_y(90).pos([1, 2, 3])
mesh.c("steelblue")

# measure the angle formed by 3 points
gon = Goniometer(
    [-0.5, 1, 2], [2.5, 2, 2], [-0.5, 3, 3], 
    prefix=":alpha_c =~", lw=2, s=0.8
)

# show distance of any 2 points
rul = Ruler3D(
    (-0.5, 2, 1.9),
    (2.5, 2, 2.9),
    prefix="L_x =",
    units="μm",
    axis_rotation=90,
    tick_angle=70,
)

# make 3d rulers along the bounding box (similar to set axes=7)
ax3 = RulerAxes(mesh, units="μm")

show(mesh, gon, rul, ax3, __doc__, bg2="lb", viewup="z").close()