ラベルポイント#

ポイントセットで文字列配列を使用してポイントにラベルを付ける

import numpy as np
import pyvista as pv
from pyvista import examples

pyvista.Plotter.add_point_labels() メソッドを使用すると,シーンにポイントラベルを簡単に追加することができます.

Help on function add_point_labels in module pyvista.plotting.plotter:

add_point_labels(self, points, labels, italic=False, bold=True, font_size=None, text_color=None, font_family=None, shadow=False, show_points=True, point_color=None, point_size=None, name=None, shape_color='grey', shape='rounded_rect', fill_shape=True, margin=3, shape_opacity=1.0, pickable=False, render_points_as_spheres=False, tolerance=0.001, reset_camera=None, always_visible=False, render=True, justification_horizontal=None, justification_vertical=None, background_color=None, background_opacity=None)
    Create a point actor with one label from list labels assigned to each point.

    Parameters
    ----------
    points : sequence | pyvista.DataSet | vtk.vtkAlgorithm
        An ``n x 3`` sequence points or :class:`pyvista.DataSet` with
        points or mesh-producing algorithm.

    labels : list | str
        List of labels.  Must be the same length as points. If a
        string name is given with a :class:`pyvista.DataSet` input for
        points, then these are fetched.

    italic : bool, default: False
        Italicises title and bar labels.

    bold : bool, default: True
        Bolds title and bar labels.

    font_size : float, optional
        Sets the size of the title font.

    text_color : ColorLike, optional
        Color of text. Either a string, RGB sequence, or hex color string.

        * ``text_color='white'``
        * ``text_color='w'``
        * ``text_color=[1.0, 1.0, 1.0]``
        * ``text_color='#FFFFFF'``

    font_family : str, optional
        Font family.  Must be either ``'courier'``, ``'times'``,
        or ``'arial``.

    shadow : bool, default: False
        Adds a black shadow to the text.

    show_points : bool, default: True
        Controls if points are visible.

    point_color : ColorLike, optional
        Either a string, rgb list, or hex color string.  One of
        the following.

        * ``point_color='white'``
        * ``point_color='w'``
        * ``point_color=[1.0, 1.0, 1.0]``
        * ``point_color='#FFFFFF'``

    point_size : float, optional
        Size of points if visible.

    name : str, optional
        The name for the added actor so that it can be easily
        updated.  If an actor of this name already exists in the
        rendering window, it will be replaced by the new actor.

    shape_color : ColorLike, default: "grey"
        Color of shape (if visible).  Either a string, rgb
        sequence, or hex color string.

    shape : str, default: "rounded_rect"
        The string name of the shape to use. Options are ``'rect'`` or
        ``'rounded_rect'``. If you want no shape, pass ``None``.

    fill_shape : bool, default: True
        Fill the shape with the ``shape_color``. Outlines if ``False``.

    margin : int, default: 3
        The size of the margin on the label background shape.

    shape_opacity : float, default: 1.0
        The opacity of the shape in the range of ``[0, 1]``.

    pickable : bool, default: False
        Set whether this actor is pickable.

    render_points_as_spheres : bool, default: False
        Render points as spheres rather than dots.

    tolerance : float, default: 0.001
        A tolerance to use to determine whether a point label is
        visible.  A tolerance is usually required because the
        conversion from world space to display space during
        rendering introduces numerical round-off.

    reset_camera : bool, optional
        Reset the camera after adding the points to the scene.

    always_visible : bool, default: False
        Skip adding the visibility filter.

    render : bool, default: True
        Force a render when ``True``.

    justification_horizontal : str, optional
        Text's horizontal justification.
        Should be either "left", "center" or "right".

        .. warning::
            If the justification is not default,
            the shape will be out of alignment with the label.
            If you use other than default,
            Please use the background color.
            See: https://github.com/pyvista/pyvista/pull/5407

    justification_vertical : str, optional
        Text's vertical justification.
        Should be either "bottom", "center" or "top".

        .. warning::
            If the justification is not default,
            the shape will be out of alignment with the label.
            If you use other than default,
            Please use the background color.
            See: https://github.com/pyvista/pyvista/pull/5407

    background_color : pyvista.Color, optional
        Background color of text's property.

    background_opacity : pyvista.Color, optional
        Background opacity of text's property.

    Returns
    -------
    vtk.vtkActor2D
        VTK label actor.  Can be used to change properties of the labels.

    Examples
    --------
    >>> import numpy as np
    >>> import pyvista as pv
    >>> pl = pv.Plotter()
    >>> points = np.array(
    ...     [[0.0, 0.0, 0.0], [1.0, 1.0, 0.0], [2.0, 0.0, 0.0]]
    ... )
    >>> labels = ['Point A', 'Point B', 'Point C']
    >>> actor = pl.add_point_labels(
    ...     points,
    ...     labels,
    ...     italic=True,
    ...     font_size=20,
    ...     point_color='red',
    ...     point_size=20,
    ...     render_points_as_spheres=True,
    ...     always_visible=True,
    ...     shadow=True,
    ... )
    >>> pl.camera_position = 'xy'
    >>> pl.show()

ラベル点群#

ランダムな点群を作り,各点に3次元空間上のラベルを付けてみよう.

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

文字列ラベルをポイントデータに追加します.これにより,各ノードにラベルが関連付けられます.

poly["My Labels"] = [f"Label {i}" for i in range(poly.n_points)]
poly
HeaderData Arrays
PolyDataInformation
N Cells10
N Points10
N Strips0
X Bounds8.060e-02, 9.093e-01
Y Bounds2.486e-02, 9.291e-01
Z Bounds3.537e-02, 9.656e-01
N Arrays1
NameFieldTypeN CompMinMax
My LabelsPoints1nannan


pyvista.Plotter.add_point_labels() を使って,ラベルを付けて点をプロットします.

# (your code here, answer below)
plotter = pv.Plotter()
plotter.add_point_labels(poly, "My Labels", point_size=20, font_size=36)
plotter.show()
e labels

ラベルノードの位置#

この例では,メッシュの節点に座標位置のラベルを付けます.

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

プロッティングクラスを作成し,非構造化グリッドを追加します

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()
e labels

ラベルスカラー値#

この例では,各ポイントにスカラー値のラベルを付けます.

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()
e labels
Open In Colab

Total running time of the script: (0 minutes 0.770 seconds)

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