"""
Inspecting node
===============
"""

# %%
# Information about a node is displayed in its tooltip. There are three items: ``id``, ``distance``,
# and ``size``.
#
# The ``id`` is the :term:`node ID`. In the following code, the ``id`` of a leaf node corresponding
# to ``X[i]`` is ``i`` and that of a branch node corresponding to ``Z[i]`` is ``i+n``.
#
# The ``distance`` is the distance between child nodes. It is zero for leaf nodes. In the following
# code, the ``distance`` of a branch node corresponding to ``Z[i]`` is its y-coordinate, or
# ``Z[i, 2]``.
#
# The ``size`` is the number of descendant leaf nodes. It is one for leaf nodes. In the following
# code, the ``size`` of a branch node corresponding to ``Z[i]`` is ``Z[i, 3]``.

import plotly.graph_objects as go
import plotly.io as pio
import scipy

from pdendro import attach_dendrogram

X = [[0.0], [1.0], [3.0], [6.0]]

Z = scipy.cluster.hierarchy.linkage(X)

fig = go.Figure()
attach_dendrogram(fig, Z)
pio.show(fig)