First implementation of game logic and control

drawutils.cpp

@@ -1,4 +1,5 @@
 #include "drawutils.h"
+#include <cmath>
 
 SDL_Surface* DrawUtils::load(string file)
 {

gamecore.cpp

@@ -8,6 +8,8 @@
 GameCore::GameCore()
 {
     display = NULL;
+    background = NULL;
+    node = NULL;
     is_running = true;
 }
 
@@ -44,13 +46,41 @@ bool GameCore::init()
 	return false;
     }
 
+    background = DrawUtils::load("background.bmp");
+    node = DrawUtils::load("node.bmp");
+
+    if (background == NULL || node == NULL)
+    {
+#ifdef DEBUG
+	std::cerr << "GameCore::init(): error: Couldn't load an image file\n";
+#endif
+	return false;
+    }
+
     return true;
 }
 
 
 void GameCore::render()
 {
+    list<Vertex> vertices = graph.get_vertices();
+    list<Edge> edges = graph.get_edges();
 
+    for (list<Vertex>::iterator cursor = vertices.begin();
+	 cursor != vertices.end(); cursor++)
+    {
+	Vertex v = *cursor;
+	DrawUtils::draw(display, node, v.x_min, v.y_min);
+    }
+
+    for (list<Edge>::iterator cursor = edges.begin();
+	 cursor != edges.end(); cursor++)
+    {
+	Edge e = *cursor;
+	DrawUtils::draw_line(e.a.x, e.a.y, e.b.x, e.b.y, 2, 0xffffff, display);
+    }
+
+    SDL_Flip(display);
 }
 
 
@@ -62,6 +92,8 @@ void GameCore::iterate()
 
 void GameCore::cleanup()
 {
+    SDL_FreeSurface(background);
+    SDL_FreeSurface(node);
     SDL_FreeSurface(display);
     SDL_Quit();
 }
@@ -71,3 +103,9 @@ void GameCore::on_exit()
 {
     is_running = false;
 }
+
+
+void GameCore::on_lbutton_down(int x, int y)
+{
+    graph.add_vertex(x, y, 25);
+}

gamecore.h

@@ -11,6 +11,7 @@
 
 #include <SDL/SDL.h>
 #include "mainevent.h"
+#include "graph.h"
 
 class GameCore : public MainEvent
 {
@@ -21,7 +22,7 @@ class GameCore : public MainEvent
  protected:
     // event handlers
     void on_exit();
-
+    void on_lbutton_down(int x, int y);
 
  private:
     bool init();
@@ -37,6 +38,9 @@ class GameCore : public MainEvent
     // textures to draw
     SDL_Surface* background;
     SDL_Surface* node;
+
+    // data
+    Graph graph;
 };
 
 #endif

graph.cpp

@@ -25,12 +25,24 @@ bool Graph::vertex_present(int x, int y, int size)
 	return false;
 }
 
-void Graph::add_vertex(Vertex v)
+void Graph::add_vertex(int x, int y, int size)
 {
-    if (vertex_present(v.x, v.y)) return;
+    Vertex v;
+    v.x = x;
+    v.y = y;
+
+    v.x_min = x - size/2;
+    v.x_max = x + size/2;
+    v.y_min = y - size/2;
+    v.y_max = y + size/2;
+
+    if (vertex_present(v.x, v.y, 25)) return;
 
     vertices.push_back(v);
-    edges.push_back(Edge(last_vertex, v));
+    Edge e;
+    e.a = last_vertex;
+    e.b = v;
+    edges.push_back(e);
     last_vertex = v;
 }
 

graph.h

@@ -15,10 +15,10 @@ struct Vertex
 {
     int x;
     int y;
-    int min_x;
+    int x_min;
-    int min_y;
+    int x_max;
-    int max_x;
+    int y_min;
-    int max_y;
+    int y_max;
 };
 
 struct Edge
@@ -37,7 +37,7 @@ class Graph
     list<Vertex> get_vertices() { return vertices; }
     list<Edge> get_edges() { return edges; }
 
-    void add_vertex(Vertex v);
+    void add_vertex(int x, int y, int size);
 
  private:
     Vertex last_vertex;