def test_graph_planar(self):
g1 = Graph([
(0, 1), (2, 7), (1, 5), (1, 6), (3, 6), (0, 4), (3, 7), (2, 5),
(3, 4), (0, 2),
])
self.assertTrue(is_planar(g1))
self.assertEqual([4, 4], link_assortment(g1))
self.assertEqual([4, 0, 0, 0], contracted_link_assortment(g1))
def __set_selection(self, item: QListWidgetItem) -> None:
"""Show the data of collection.
Save the layout position to keep the graphs
will be in same appearance.
"""
for button in (
self.delete_button,
self.configure_button,
self.duplicate_button,
):
button.setEnabled(item is not None)
self.selection_window.clear()
if item is None:
return
# Preview item
link_is_node = self.graph_link_as_node.isChecked()
item_preview = QListWidgetItem(item.text())
row = self.collection_list.row(item)
g = self.collections[row]
self.ground_engine = self.collections_layouts[row]
item_preview.setIcon(
graph2icon(g,
self.selection_window.iconSize().width(),
link_is_node,
self.graph_show_label.isChecked(),
self.prefer.monochrome_option,
pos=self.ground_engine))
self.selection_window.addItem(item_preview)
# Set attributes
self.edges_text.setText(str(list(g.edges)))
self.nl_label.setText(str(len(g.vertices)))
self.nj_label.setText(str(len(g.edges)))
self.dof_label.setText(str(g.dof()))
self.is_degenerate_label.setText(str(g.is_degenerate()))
self.link_assortment_label.setText(str(link_assortment(g)))
self.contracted_link_assortment_label.setText(
str(contracted_link_assortment(g)))
# Buttons
self.duplicate_button.setEnabled(link_is_node)
self.configure_button.setEnabled(not link_is_node)
self.merge_button.setEnabled(not link_is_node)
self.__grounded()