Added code for drawing a circle around selected vertex

drawutils.cpp

@@ -173,8 +173,6 @@ void DrawUtils::draw_text(SDL_Surface* display, string text, int x, int y,
 	return;
     }
 
-    transpare(surface);
-    
     /* Blit the surface */
     dest.x = (center_x ? (display->w - surface->w) / 2 : x);
     dest.y = (center_y ? (display->h - surface->h) / 2 : y);
@@ -184,3 +182,33 @@ void DrawUtils::draw_text(SDL_Surface* display, string text, int x, int y,
     SDL_BlitSurface(surface, NULL, display, &dest);
     SDL_FreeSurface(surface);
 }
+
+
+void DrawUtils::draw_circle(SDL_Surface* dest, Sint16 int_x, Sint16 int_y,
+			    Uint16 int_r, Uint32 colour)
+{
+    float x = static_cast<float> (int_x);
+    float y = static_cast<float> (int_y);
+    float r = static_cast<float> (int_r);
+
+    SDL_Rect pen;
+    float i;
+
+    for (i=0; i < 6.28318531; i += 0.0034906585)
+    {
+	pen.x = static_cast<int> (x + cos(i) * r);
+	pen.y = static_cast<int> (y + sin(i) * r);
+	int w = 2;
+        int h = 2;
+
+	if (pen.x >= dest->clip_rect.x &&
+	    pen.y >= dest->clip_rect.y &&
+	    pen.x + pen.w <= dest->clip_rect.w &&
+	    pen.y + pen.h <= dest->clip_rect.h)
+	    SDL_FillRect(dest, &pen,
+			 SDL_MapRGBA(dest->format,
+				     (colour >> 16) & 0xff,
+				     (colour >> 8) & 0xff,
+				     colour & 0xff, 1));
+    }
+}

drawutils.h

@@ -21,6 +21,7 @@ class DrawUtils
 		     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(SDL_Surface* dest, Sint16 x, Sint16 y, Uint16 r, Uint32 colour);
     static void draw_circle_filled(SDL_Surface* dest, Sint16 x, Sint16 y, Uint16 r, Uint32 colour);
 
     static void draw_text(SDL_Surface* display, string text, int x, int y,

game.cpp

@@ -99,6 +99,13 @@ void Game::render()
 	}
     }
 
+    // Finally, ring the selected vertex
+    if (data.get_current_vertex() != NULL)
+    {
+	Vertex* v = data.get_current_vertex();
+	DrawUtils::draw_circle(display, v->x, v->y, v->r + 5, 0x000000);
+    }
+
     SDL_Flip(display);
 }