Initial version of node map facilities.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@281 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/nodemap/Edge.java

@@ -0,0 +1,59 @@
+//
+// $Id: Edge.java,v 1.1 2001/08/20 22:56:55 shaper Exp $
+
+package com.threerings.nodemap;
+
+import java.awt.Graphics;
+
+/**
+ * The edge class represents an edge connecting two nodes.
+ */
+public abstract class Edge
+{
+    /** The source node. */
+    public Node src;
+
+    /** The destination node. */
+    public Node dst;
+
+    /**
+     * Construct an edge object connecting the given nodes.
+     *
+     * @param src the source node.
+     * @param dst the destination node.
+     */
+    public Edge (Node src, Node dst)
+    {
+	this.src = src;
+	this.dst = dst;
+    }
+
+    /**
+     * Paint the edge to the given graphics context.
+     *
+     * @param g the graphics context.
+     */
+    public abstract void paint (Graphics g);
+
+    /**
+     * Return a string representation of this edge.
+     */
+    public String toString ()
+    {
+	StringBuffer buf = new StringBuffer();
+	buf.append("[");
+	toString(buf);
+	return buf.append("]").toString();
+    }
+
+    /**
+     * This should be overridden by derived classes (which should be sure
+     * to call <code>super.toString()</code>) to append the derived class
+     * specific event information to the string buffer.
+     */
+    public void toString (StringBuffer buf)
+    {
+	buf.append("src=").append(src);
+	buf.append(", dst=").append(dst);
+    }
+}