01: import java.awt.*;
02: import java.util.*;
03: 
04: /**
05:    A simple graph with round nodes and straight edges.
06: */
07: public class SimpleGraph extends Graph
08: {
09:    public Node[] getNodePrototypes()
10:    {
11:       Node[] nodeTypes =
12:          {
13:             new CircleNode(Color.BLACK),
14:             new CircleNode(Color.WHITE)
15:          };
16:       return nodeTypes;
17:    }
18: 
19:    public Edge[] getEdgePrototypes()
20:    {
21:       Edge[] edgeTypes = 
22:          {
23:             new LineEdge()
24:          };
25:       return edgeTypes;
26:    }
27: }
28: 
29: 
30: 
31: 
32: