# Plot Scalars Over a Circular Arc
# ================================

# Interpolate the scalars of a dataset over a circular arc
# using `plot_over_circular_arc_normal()`.
import pyvista as pv
from pyvista import examples

# Volumetric Mesh
# ---------------

# Add the height scalars to a uniform 3D mesh.
mesh = examples.load_uniform()
mesh['height'] = mesh.points[:, 2]

# Make two points at the bounds of the mesh and one at the center to
# construct a circular arc.
normal = [0, 1, 0]
bnds = mesh.bounds
polar = [bnds.x_min, bnds.y_min, bnds.z_max]
center = [bnds.x_min, bnds.y_min, bnds.z_min]
angle = 90.0

# Preview how this circular arc intersects this mesh
# with ~pyvista.CircularArcFromNormal.
arc = pv.CircularArcFromNormal(
    center=center, resolution=100, normal=normal, polar=polar, angle=angle
)

pl = pv.Plotter()
pl.add_mesh(mesh, style='wireframe', color='w')
pl.add_mesh(arc, color='b')
a = arc.points[0]
b = arc.points[-1]
pl.add_point_labels([a, b], ['A', 'B'], font_size=48, point_color='red', text_color='red')
pl.show()

# Run the filter and produce a line plot.
mesh.plot_over_circular_arc_normal(
    center=center,
    resolution=100,
    normal=normal,
    polar=polar,
    angle=angle,
    scalars='height',
)

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