# Examples from pyvista.plotting.widgets.WidgetComponent.add_line_widget
# ======================================================================

# Shows an interactive line widget to move the sliced object
# like in add_mesh_slice function.
import pyvista as pv
from pyvista import examples
import numpy as np
model = examples.load_channels()
pl = pv.Plotter()
_ = pl.add_mesh(model, opacity=0.4)
def move_center(pointa, pointb):
    center = (np.array(pointa) + np.array(pointb)) / 2
    normal = np.array(pointa) - np.array(pointb)
    single_slc = model.slice(normal=normal, origin=center)

    _ = pl.add_mesh(single_slc, name='slc')
_ = pl.add_line_widget(callback=move_center, use_vertices=True)
pl.show()

# ----------------------------------------------------------------------
# Generated by sphinx-examples-as-code https://github.com/pyvista/sphinx-examples-as-code