289 lines
9.0 KiB
Python
289 lines
9.0 KiB
Python
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"""Unit tests for shp.
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"""
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import os
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import tempfile
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import pytest
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ogr = pytest.importorskip("osgeo.ogr")
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import networkx as nx
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class TestShp:
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def setup_method(self):
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def createlayer(driver, layerType=ogr.wkbLineString):
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lyr = driver.CreateLayer("edges", None, layerType)
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namedef = ogr.FieldDefn("Name", ogr.OFTString)
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namedef.SetWidth(32)
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lyr.CreateField(namedef)
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return lyr
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drv = ogr.GetDriverByName("ESRI Shapefile")
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testdir = os.path.join(tempfile.gettempdir(), "shpdir")
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shppath = os.path.join(tempfile.gettempdir(), "tmpshp.shp")
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multi_shppath = os.path.join(tempfile.gettempdir(), "tmp_mshp.shp")
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self.deletetmp(drv, testdir, shppath, multi_shppath)
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os.mkdir(testdir)
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self.names = ["a", "b", "c", "c"] # edgenames
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self.paths = (
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[(1.0, 1.0), (2.0, 2.0)],
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[(2.0, 2.0), (3.0, 3.0)],
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[(0.9, 0.9), (4.0, 0.9), (4.0, 2.0)],
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)
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self.simplified_names = ["a", "b", "c"] # edgenames
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self.simplified_paths = (
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[(1.0, 1.0), (2.0, 2.0)],
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[(2.0, 2.0), (3.0, 3.0)],
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[(0.9, 0.9), (4.0, 2.0)],
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)
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self.multi_names = ["a", "a", "a", "a"] # edgenames
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shp = drv.CreateDataSource(shppath)
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lyr = createlayer(shp)
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for path, name in zip(self.paths, self.names):
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feat = ogr.Feature(lyr.GetLayerDefn())
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g = ogr.Geometry(ogr.wkbLineString)
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for p in path:
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g.AddPoint_2D(*p)
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feat.SetGeometry(g)
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feat.SetField("Name", name)
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lyr.CreateFeature(feat)
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# create single record multiline shapefile for testing
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multi_shp = drv.CreateDataSource(multi_shppath)
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multi_lyr = createlayer(multi_shp, ogr.wkbMultiLineString)
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multi_g = ogr.Geometry(ogr.wkbMultiLineString)
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for path in self.paths:
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g = ogr.Geometry(ogr.wkbLineString)
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for p in path:
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g.AddPoint_2D(*p)
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multi_g.AddGeometry(g)
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multi_feat = ogr.Feature(multi_lyr.GetLayerDefn())
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multi_feat.SetGeometry(multi_g)
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multi_feat.SetField("Name", "a")
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multi_lyr.CreateFeature(multi_feat)
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self.shppath = shppath
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self.multi_shppath = multi_shppath
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self.testdir = testdir
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self.drv = drv
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def deletetmp(self, drv, *paths):
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for p in paths:
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if os.path.exists(p):
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drv.DeleteDataSource(p)
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def testload(self):
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def compare_graph_paths_names(g, paths, names):
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expected = nx.DiGraph()
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for p in paths:
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nx.add_path(expected, p)
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assert sorted(expected.nodes) == sorted(g.nodes)
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assert sorted(expected.edges()) == sorted(g.edges())
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g_names = [g.get_edge_data(s, e)["Name"] for s, e in g.edges()]
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assert names == sorted(g_names)
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# simplified
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G = nx.read_shp(self.shppath)
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compare_graph_paths_names(G, self.simplified_paths, self.simplified_names)
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# unsimplified
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G = nx.read_shp(self.shppath, simplify=False)
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compare_graph_paths_names(G, self.paths, self.names)
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# multiline unsimplified
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G = nx.read_shp(self.multi_shppath, simplify=False)
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compare_graph_paths_names(G, self.paths, self.multi_names)
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def checkgeom(self, lyr, expected):
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feature = lyr.GetNextFeature()
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actualwkt = []
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while feature:
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actualwkt.append(feature.GetGeometryRef().ExportToWkt())
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feature = lyr.GetNextFeature()
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assert sorted(expected) == sorted(actualwkt)
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def test_geometryexport(self):
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expectedpoints_simple = (
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"POINT (1 1)",
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"POINT (2 2)",
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"POINT (3 3)",
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"POINT (0.9 0.9)",
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"POINT (4 2)",
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)
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expectedlines_simple = (
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"LINESTRING (1 1,2 2)",
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"LINESTRING (2 2,3 3)",
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"LINESTRING (0.9 0.9,4.0 0.9,4 2)",
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)
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expectedpoints = (
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"POINT (1 1)",
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"POINT (2 2)",
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"POINT (3 3)",
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"POINT (0.9 0.9)",
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"POINT (4.0 0.9)",
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"POINT (4 2)",
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)
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expectedlines = (
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"LINESTRING (1 1,2 2)",
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"LINESTRING (2 2,3 3)",
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"LINESTRING (0.9 0.9,4.0 0.9)",
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"LINESTRING (4.0 0.9,4 2)",
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)
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tpath = os.path.join(tempfile.gettempdir(), "shpdir")
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G = nx.read_shp(self.shppath)
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nx.write_shp(G, tpath)
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shpdir = ogr.Open(tpath)
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self.checkgeom(shpdir.GetLayerByName("nodes"), expectedpoints_simple)
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self.checkgeom(shpdir.GetLayerByName("edges"), expectedlines_simple)
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# Test unsimplified
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# Nodes should have additional point,
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# edges should be 'flattened'
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G = nx.read_shp(self.shppath, simplify=False)
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nx.write_shp(G, tpath)
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shpdir = ogr.Open(tpath)
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self.checkgeom(shpdir.GetLayerByName("nodes"), expectedpoints)
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self.checkgeom(shpdir.GetLayerByName("edges"), expectedlines)
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def test_attributeexport(self):
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def testattributes(lyr, graph):
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feature = lyr.GetNextFeature()
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while feature:
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coords = []
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ref = feature.GetGeometryRef()
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last = ref.GetPointCount() - 1
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edge_nodes = (ref.GetPoint_2D(0), ref.GetPoint_2D(last))
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name = feature.GetFieldAsString("Name")
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assert graph.get_edge_data(*edge_nodes)["Name"] == name
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feature = lyr.GetNextFeature()
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tpath = os.path.join(tempfile.gettempdir(), "shpdir")
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G = nx.read_shp(self.shppath)
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nx.write_shp(G, tpath)
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shpdir = ogr.Open(tpath)
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edges = shpdir.GetLayerByName("edges")
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testattributes(edges, G)
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# Test export of node attributes in nx.write_shp (#2778)
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def test_nodeattributeexport(self):
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tpath = os.path.join(tempfile.gettempdir(), "shpdir")
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G = nx.DiGraph()
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A = (0, 0)
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B = (1, 1)
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C = (2, 2)
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G.add_edge(A, B)
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G.add_edge(A, C)
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label = "node_label"
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for n, d in G.nodes(data=True):
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d["label"] = label
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nx.write_shp(G, tpath)
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H = nx.read_shp(tpath)
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for n, d in H.nodes(data=True):
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assert d["label"] == label
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def test_wkt_export(self):
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G = nx.DiGraph()
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tpath = os.path.join(tempfile.gettempdir(), "shpdir")
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points = ("POINT (0.9 0.9)", "POINT (4 2)")
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line = ("LINESTRING (0.9 0.9,4 2)",)
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G.add_node(1, Wkt=points[0])
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G.add_node(2, Wkt=points[1])
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G.add_edge(1, 2, Wkt=line[0])
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try:
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nx.write_shp(G, tpath)
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except Exception as err:
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assert False, err
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shpdir = ogr.Open(tpath)
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self.checkgeom(shpdir.GetLayerByName("nodes"), points)
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self.checkgeom(shpdir.GetLayerByName("edges"), line)
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def teardown_method(self):
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self.deletetmp(self.drv, self.testdir, self.shppath)
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def test_read_shp_nofile():
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with pytest.raises(RuntimeError):
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G = nx.read_shp("hopefully_this_file_will_not_be_available")
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class TestMissingGeometry:
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def setup_method(self):
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self.setup_path()
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self.delete_shapedir()
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self.create_shapedir()
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def teardown_method(self):
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self.delete_shapedir()
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def setup_path(self):
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self.path = os.path.join(tempfile.gettempdir(), "missing_geometry")
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def create_shapedir(self):
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drv = ogr.GetDriverByName("ESRI Shapefile")
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shp = drv.CreateDataSource(self.path)
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lyr = shp.CreateLayer("nodes", None, ogr.wkbPoint)
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feature = ogr.Feature(lyr.GetLayerDefn())
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feature.SetGeometry(None)
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lyr.CreateFeature(feature)
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feature.Destroy()
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def delete_shapedir(self):
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drv = ogr.GetDriverByName("ESRI Shapefile")
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if os.path.exists(self.path):
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drv.DeleteDataSource(self.path)
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def test_missing_geometry(self):
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with pytest.raises(nx.NetworkXError):
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G = nx.read_shp(self.path)
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class TestMissingAttrWrite:
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def setup_method(self):
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self.setup_path()
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self.delete_shapedir()
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def teardown_method(self):
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self.delete_shapedir()
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def setup_path(self):
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self.path = os.path.join(tempfile.gettempdir(), "missing_attributes")
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def delete_shapedir(self):
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drv = ogr.GetDriverByName("ESRI Shapefile")
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if os.path.exists(self.path):
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drv.DeleteDataSource(self.path)
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def test_missing_attributes(self):
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G = nx.DiGraph()
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A = (0, 0)
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B = (1, 1)
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C = (2, 2)
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G.add_edge(A, B, foo=100)
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G.add_edge(A, C)
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nx.write_shp(G, self.path)
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H = nx.read_shp(self.path)
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for u, v, d in H.edges(data=True):
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if u == A and v == B:
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assert d["foo"] == 100
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if u == A and v == C:
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assert d["foo"] is None
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