nous grafics

source/common/utils.cpp

@@ -222,4 +222,43 @@ hiScoreEntry_t sortHiScoreTable(hiScoreEntry_t entry1, hiScoreEntry_t entry2)
     }
 
     return entry2;
+}
+
+// Dibuja un circulo
+void DrawCircle(SDL_Renderer * renderer, int32_t centerX, int32_t centerY, int32_t radius)
+{
+   const int32_t diameter = (radius * 2);
+
+   int32_t x = (radius - 1);
+   int32_t y = 0;
+   int32_t tx = 1;
+   int32_t ty = 1;
+   int32_t error = (tx - diameter);
+
+   while (x >= y)
+   {
+      //  Each of the following renders an octant of the circle
+      SDL_RenderDrawPoint(renderer, centerX + x, centerY - y);
+      SDL_RenderDrawPoint(renderer, centerX + x, centerY + y);
+      SDL_RenderDrawPoint(renderer, centerX - x, centerY - y);
+      SDL_RenderDrawPoint(renderer, centerX - x, centerY + y);
+      SDL_RenderDrawPoint(renderer, centerX + y, centerY - x);
+      SDL_RenderDrawPoint(renderer, centerX + y, centerY + x);
+      SDL_RenderDrawPoint(renderer, centerX - y, centerY - x);
+      SDL_RenderDrawPoint(renderer, centerX - y, centerY + x);
+
+      if (error <= 0)
+      {
+         ++y;
+         error += ty;
+         ty += 2;
+      }
+
+      if (error > 0)
+      {
+         --x;
+         tx += 2;
+         error += (tx - diameter);
+      }
+   }
 }