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"""Hover mouse to interactively fit a sphere to a region of the mesh"""
from vedo import *
def func(event): # callback function
p = event.picked3d
if p is None:
return
pts = Points(msh.closest_point(p, n=50), r=6)
sph = fit_sphere(pts).alpha(0.1).pickable(False)
pts.name = "mypoints" # we give it a name to make it easy to
sph.name = "mysphere" # remove the old and add the new ones
txt.text(f'Radius : {sph.radius}\nResidue: {sph.residue}')
plt.remove("mypoints", "mysphere").add(pts, sph).render()
txt = Text2D(__doc__, bg='yellow', font='Calco')
msh = Mesh(dataurl+'290.vtk').subdivide()
msh.compute_curvature(method=2)
msh.cmap('PRGn', vmin=-0.02).add_scalarbar()
plt = Plotter(axes=1)
plt.add_callback('mouse hover', func)
plt.show(msh, txt, viewup='z')
plt.close()
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