def test_1_Basics(self):
g = Graph()
n1 = GraphNode('A', 0, 0, 200, 200)
n2 = GraphNode('B', 0, 0, 200, 200)
g.AddEdge(n1, n2)
#for node in g.nodes:
# print node, "layout info:", (node.layoutPosX, node.layoutPosY)
#print g.GraphToString().strip()
assert len(g.nodes) == 2
assert len(g.nodeSet.keys()) == 2
assert len(g.edges) == 1
g.DeleteNodeById('B')
assert len(g.nodes) == 1
assert len(g.nodeSet.keys()) == 1
assert len(g.edges) == 0
# Old persistence format - very simple, I call this 0.9 format.
filedata = """
{'type':'node', 'id':'c', 'x':230, 'y':174, 'width':60, 'height':120}
{'type':'node', 'id':'c1', 'x':130, 'y':174, 'width':60, 'height':120}
{'type':'edge', 'id':'c_to_c1', 'source':'c', 'target':'c1'}
"""
g.Clear()
assert len(g.nodes) == 0
assert g.GraphToString().strip() == ""
g.LoadGraphFromStrings(filedata)
#for node in g.nodes:
# print node, "layout info:", (node.layoutPosX, node.layoutPosY)
#assert g.GraphToString().strip() == filedata.strip(), g.GraphToString().strip() # no longer true since upgrades to persistence format will translate the incoming text
# Line intersection tests
res = FindLineIntersection((0, 0), (200, 200), (10, 10), (10, 50))
assert res == [10, 10]
res = FindLineIntersection((0, 30), (200, 30), (10, 10), (10, 50))
assert res == [10, 30]
node = GraphNode("A", 10, 10, 30, 40)
assert len(node.lines) == 4
assert (10, 10) in node.lines[0]
assert (40, 10) in node.lines[0]
assert (40, 10) in node.lines[1]
assert (40, 50) in node.lines[1]
assert (40, 50) in node.lines[2]
assert (10, 50) in node.lines[2]
assert (10, 50) in node.lines[3]
assert (10, 10) in node.lines[3]
res = node.CalcLineIntersectionPoints((0, 0), (200, 200))
assert len(res) == 2
assert (10, 10) in res
assert (40, 40) in res
res = node.CalcLineIntersectionPoints((20, 0), (20, 1000))
assert len(res) == 2
assert (20, 10) in res
assert (20, 50) in res
