Refactored all the rendering code into its own class

Makefile

@@ -4,7 +4,7 @@ PROJECT=graphgame
 CXX=g++
 CXXFLAGS=-DDEBUG -g
 LDFLAGS=-lSDL
-OBJECTS=drawutils.o gamecore.o graph.o main.o mainevent.o mathutils.o gamedata.o
+OBJECTS=drawutils.o gamecore.o graph.o main.o mainevent.o mathutils.o gamedata.o sdlrenderer.o
 
 all: $(PROJECT)
 

drawutils.h

@@ -12,16 +12,22 @@ class DrawUtils
 {
  public:
     DrawUtils() {}
+
     static SDL_Surface* load(string file);
 
     static bool draw(SDL_Surface* dest, SDL_Surface* drawable, int x, int y);
     static bool draw(SDL_Surface* dest, SDL_Surface* drawable, int x, int y, 
 		     int x2, int y2, int w, int h);
+
     static void draw_line(SDL_Surface* dest, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint16 width, Uint32 colour);
     static void draw_circle_filled(SDL_Surface* dest, Sint16 x, Sint16 y, Uint16 r, Uint32 colour);
 
     // transpare (v) - to make transparent
-    static bool transpare(SDL_Surface* surface, int r, int g, int b);
+    // this function makes a particular color key on a surface transparent
+    // the traditional color key is 255, 0, 255 (bright pink), so we default
+    // to that
+    static bool transpare(SDL_Surface* surface, int r = 255, int g = 0,
+			  int b = 255);
 };
 
 #endif

gamecore.cpp

@@ -1,15 +1,12 @@
 #include "gamecore.h"
-#include "drawutils.h"
 #include "mathutils.h"
-#include "debug.h"
+#include <SDL/SDL.h>
 
 int GameCore::MAX_MOVE_DISTANCE = 100;
 int GameCore::NODE_RADIUS = 12;
 
 GameCore::GameCore()
 {
-    display = NULL;
-    background = NULL;
     is_running = true;
 }
 
@@ -23,8 +20,8 @@ int GameCore::execute()
     {
 	while(SDL_PollEvent(&event))
 	    handle_event(&event);
-	iterate();
-	render();
+	//	iterate();
+	renderer.render(data, MAX_MOVE_DISTANCE);
     }
 
     cleanup();
@@ -37,77 +34,13 @@ bool GameCore::init()
 {
     if (SDL_Init(SDL_INIT_EVERYTHING) < 0) return false;
 
-    display = SDL_SetVideoMode(1024,768,32, SDL_HWSURFACE | SDL_DOUBLEBUF);
-    if (display == NULL)
-    {
-#ifdef DEBUG
-	std::cerr << "GameCore::init(): error: Couldn't create main surface\n";
-#endif
-	return false;
-    }
-
-    background = DrawUtils::load("background.bmp");
-
-    if (background == NULL)
-    {
-#ifdef DEBUG
-	std::cerr << "GameCore::init(): error: Couldn't load background image\n";
-#endif
-	return false;
-    }
-
-    // DrawUtils::transpare(node, 255, 0, 255);
-    // DrawUtils::transpare(move_template, 255, 0, 255);
-    // SDL_SetAlpha(move_template, SDL_SRCALPHA, 128);
-
-    return true;
-}
-
-
-void GameCore::render()
-{
-    DrawUtils::draw(display, background, 0, 0);
-
-    list<Vertex*> vertices = data.get_vertices();
-    list<Edge> edges = data.get_edges();
-
-    if (data.get_current_vertex() != NULL)
-    {
-	Vertex* v = data.get_current_vertex();
-	DrawUtils::draw_circle_filled(display, v->x, v->y,
-				      MAX_MOVE_DISTANCE, 0xcb1919);
-    }
-
-    for (list<Vertex*>::iterator cursor = vertices.begin();
-	 cursor != vertices.end(); cursor++)
-    {
-	Vertex v = *(*cursor);
-	DrawUtils::draw_circle_filled(display, v.x, v.y, v.r,
-				      v.colour);
-    }
-
-    for (list<Edge>::iterator cursor = edges.begin();
-	 cursor != edges.end(); cursor++)
-    {
-	Edge e = *cursor;
-	DrawUtils::draw_line(display, e.a->x, e.a->y, e.b->x, e.b->y, 2,
-			     e.a->colour);
-    }
-
-    SDL_Flip(display);
-}
-
-
-void GameCore::iterate()
-{
-
+    return renderer.init();
 }
 
 
 void GameCore::cleanup()
 {
-    SDL_FreeSurface(background);
-    SDL_FreeSurface(display);
+    renderer.cleanup();
     SDL_Quit();
 }
 

gamecore.h

@@ -9,9 +9,9 @@
 #ifndef _GAME_CORE_H_
 #define _GAME_CORE_H_
 
-#include <SDL/SDL.h>
 #include "mainevent.h"
 #include "gamedata.h"
+#include "sdlrenderer.h"
 
 class GameCore : public MainEvent
 {
@@ -28,16 +28,12 @@ class GameCore : public MainEvent
  private:
     bool init();
 
-    void iterate(); // updates the game state
     void render();
     void cleanup();
 
     bool is_running;
 
-    SDL_Surface* display;
-
-    // textures to draw
-    SDL_Surface* background;
+    SDLRenderer renderer;
 
     // data
     GameData data;