Label Points

Use string arrays in a point set to label points

# sphinx_gallery_thumbnail_number = 3
from pyvista import examples
import pyvista as pv
import numpy as np

# Labels are not currently supported by the VTKjs conversion script
pv.rcParams["use_panel"] = False

Label String Array

This example will label the nodes of a mesh with a given array of string labels for each of the nodes.

# Make some random points
poly = pv.PolyData(np.random.rand(10, 3))

Add string labels to the point data - this associates a label with every node:

poly["My Labels"] = ["Label {}".format(i) for i in range(poly.n_points)]

print(poly)

Out:

PolyData (0x7efc309f6fa8)
  N Cells:      10
  N Points:     10
  X Bounds:     1.725e-01, 8.676e-01
  Y Bounds:     5.458e-02, 9.623e-01
  Z Bounds:     4.159e-01, 9.696e-01
  N Arrays:     1

Now plot the points with labels:

plotter = pv.Plotter()
plotter.add_point_labels(poly, "My Labels", point_size=20, font_size=36)
plotter.show()
../../_images/sphx_glr_labels_001.png

Label Node Locations

This example will label the nodes of a mesh with their coordinate locations

# Load example beam file
grid = pv.UnstructuredGrid(examples.hexbeamfile)

Create plotting class and add the unstructured grid

plotter = pv.Plotter()
plotter.add_mesh(grid, show_edges=True, color="tan")

# Add labels to points on the yz plane (where x == 0)
points = grid.points
mask = points[:, 0] == 0
plotter.add_point_labels(
    points[mask], points[mask].tolist(), point_size=20, font_size=36
)

plotter.camera_position = [
    (-1.5, 1.5, 3.0),
    (0.05, 0.6, 1.2),
    (0.2, 0.9, -0.25)]

plotter.show()
../../_images/sphx_glr_labels_002.png

Label Scalar Values

This example will label each point with their scalar values

mesh = examples.load_uniform().slice()
p = pv.Plotter()

# Add the mesh:
p.add_mesh(mesh, scalars="Spatial Point Data", show_edges=True)
# Add the points with scalar labels:
p.add_point_scalar_labels(mesh, "Spatial Point Data", point_size=20, font_size=36)

# Use a nice camera position:
p.camera_position = [(7, 4, 5), (4.4, 7.0, 7.2), (0.8, 0.5, 0.25)]

p.show()
../../_images/sphx_glr_labels_003.png

Total running time of the script: ( 0 minutes 4.799 seconds)

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