added a score value and some docs to Graph class

graph.cpp

@@ -71,9 +71,9 @@ bool Graph::crosses_edge(Edge e)
 }
 
 
-bool Graph::add_vertex(int x, int y, int r, int colour, Vertex* src)
+bool Graph::add_vertex(int x, int y, int r, int colour, int score, Vertex* src)
 {
-    Vertex* v = new Vertex(x, y, r, colour);
+    Vertex* v = new Vertex(x, y, r, colour, score);
 
     // Make sure the nodes won't overlap
     if (vertex_would_overlap(v->x, v->y, v->r))

graph.h

@@ -1,7 +1,17 @@
 /* Represents an undirected graph.
  * Also contains the vertex and edge classes
- * vertexes know their center point on the SDL Surface - 
- * bad decoupling maybe, but not too bad, all things considered
+ * These are not quite traditional graph theory graphs, because they also have
+ * cartesian coordinates, and can do some math to ensure planarity is preserved
+ * (that is, planarity in the existant layout, not being isomorphic to a
+ * planar)
+ *
+ * Each vertex also contains a 'colour' and a 'score', which are just integers
+ * but may be useful for various algorithms
+ *
+ * fixme: this isn't a terribly *efficient* setup - Vertices don't know about
+ * their neighbors, because the 'edge' class handles that instead. This makes
+ * walking the tree O(n^2) or so, which is crappy. However, this implementation
+ * is *simple* and will do well for small-to-medium graphs, I suspect
  */
 
 #ifndef _GRAPH_H_
@@ -14,18 +24,20 @@ using std::list;
 class Vertex
 {
   public:
-    Vertex(int x, int y, int r, int colour = 0x000000);
+    Vertex(int x, int y, int r, int colour = 0, int score = 0);
 
     int x;
     int y;
     int r;
     int colour;
+    int score;
 };
 
 struct Edge
 {
     Vertex* a;
     Vertex* b;
+    int score;
 };
 
 class Graph
@@ -39,20 +51,19 @@ class Graph
 
     bool point_in_vertex(int x, int y, int size);
     Vertex * vertex_at(int x, int y);
-    virtual bool add_vertex(int x, int y, int r, int colour, Vertex* src=NULL);
+    virtual bool add_vertex(int x, int y, int r, int colour = 0, int score = 0,
+			    Vertex* src=NULL);
 
     bool is_planar() const { return planar; }
     void set_planar(bool planar) { this->planar = planar; }
 
- private:
-    bool vertex_would_overlap(int x, int y, int r);
-    bool crosses_edge(Edge e);
-
  protected:
     list<Vertex*> vertices;
     list<Edge> edges;
 
  private:
+    bool vertex_would_overlap(int x, int y, int r);
+    bool crosses_edge(Edge e);
     bool planar;
 };