Added transparency to nodes

drawutils.cpp

@@ -87,3 +87,13 @@ void DrawUtils::draw_line(Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint16 wid
 	cy += dy;
     }
 }
+
+
+bool DrawUtils::transpare(SDL_Surface* surface, int r, int g, int b)
+{
+    if (surface == NULL) return false;
+
+    SDL_SetColorKey(surface, SDL_SRCCOLORKEY|SDL_RLEACCEL, SDL_MapRGB(surface->format, r, g, b));
+
+    return true;
+}