Refactored code heavily to be able to use a state stack - main function now does the basic init, looping, and shutdown, and each state is a pointer to an object that has its own event handling, rendering, etc

game.h

@@ -0,0 +1,46 @@
+/* This is the heart of the application - the main game state where we are
+   actually playing.
+
+   This contains the basic game logic.
+ */
+
+#ifndef _GAME_H_
+#define _GAME_H_
+
+#include "gamedata.h"
+#include "sdlrenderer.h"
+#include "gamestate.h"
+#include <stack>
+
+using std::stack;
+
+
+class Game : public GameState
+{
+ public:
+    Game() {}
+    ~Game();
+
+    bool init();
+    void execute(stack<GameState*> &state_stack) throw(StateExit);
+
+ protected:
+    // event handlers
+    void on_exit();
+    void on_lbutton_down(int x, int y);
+    void on_rbutton_down(int mX, int mY);
+    void on_key_down(SDLKey sym, SDLMod mod, Uint16 unicode);
+
+ private:
+    void render();
+
+    SDLRenderer renderer;
+
+    // data
+    GameData data;
+
+    static int NODE_RADIUS;
+    static int MAX_MOVE_DISTANCE;
+};
+
+#endif