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Adding a get_coordinates() method to Quadmesh collections #18472

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Merged
tacaswell merged 1 commit into from
May 26, 2021
Merged

Adding a get_coordinates() method to Quadmesh collections #18472

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10 changes: 10 additions & 0 deletions lib/matplotlib/collections.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2048,6 +2048,16 @@ def set_paths(self):
def get_datalim(self, transData):
return (self.get_transform() - transData).transform_bbox(self._bbox)

def get_coordinates(self):
"""
Return the vertices of the mesh as an (M+1, N+1, 2) array.

M, N are the number of quadrilaterals in the rows / columns of the
mesh, corresponding to (M+1, N+1) vertices.
The last dimension specifies the components (x, y).
"""
return self._coordinates

@staticmethod
def convert_mesh_to_paths(meshWidth, meshHeight, coordinates):
"""
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12 changes: 12 additions & 0 deletions lib/matplotlib/tests/test_collections.py
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Original file line number Diff line number Diff line change
Expand Up @@ -786,6 +786,18 @@ def test_quadmesh_deprecated_positional(fig_test, fig_ref):
ax.add_collection(qmesh)


def test_quadmesh_get_coordinates():
x = [0, 1, 2]
y = [2, 4, 6]
z = np.ones(shape=(2, 2))
xx, yy = np.meshgrid(x, y)
coll = plt.pcolormesh(xx, yy, z)

# shape (3, 3, 2)
coords = np.stack([xx.T, yy.T]).T
assert_array_equal(coll.get_coordinates(), coords)


def test_quadmesh_set_array():
x = np.arange(4)
y = np.arange(4)
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