class DelaunayGraph(Graph):
"""Graph of a voronoi grid.
Examples
--------
>>> from landlab.graph import DelaunayGraph
"""
[docs]
def __init__(
self, node_y_and_x, max_node_spacing=None, sort=False, perimeter_links=None
):
"""Create a voronoi grid.
Parameters
----------
nodes : tuple of array_like
Coordinates of every node. First *y*, then *x*.
Examples
--------
>>> from landlab.graph import DelaunayGraph
>>> node_x = [0.0, 1.0, 2.0, 0.9, 1.9, 2.9]
>>> node_y = [0, 0, 0, 2, 2, 2]
>>> graph = DelaunayGraph((node_y, node_x), sort=True)
>>> graph.x_of_node
array([ 0. , 1. , 2. , 0.9, 1.9, 2.9])
>>> graph.y_of_node
array([ 0., 0., 0., 2., 2., 2.])
>>> graph.nodes_at_link
array([[0, 1], [1, 2],
[0, 3], [1, 3], [1, 4], [2, 4], [2, 5],
[3, 4], [4, 5]])
>>> graph.links_at_node
array([[ 0, 2, -1, -1], [ 1, 4, 3, 0], [ 6, 5, 1, -1],
[ 7, 2, 3, -1], [ 8, 7, 4, 5], [ 8, 6, -1, -1]])
>>> graph.links_at_patch
array([[3, 2, 0], [5, 4, 1], [7, 3, 4], [8, 5, 6]])
>>> graph.nodes_at_patch
array([[3, 0, 1], [4, 1, 2], [4, 3, 1], [5, 4, 2]])
"""
mesh = VoronoiDelaunayToGraph(
np.vstack((node_y_and_x[1], node_y_and_x[0])).T,
perimeter_links=perimeter_links,
)
Graph.__init__(
self,
node_y_and_x,
links=mesh.nodes_at_link,
patches=mesh.links_at_patch,
sort=sort,
)