title: Filled circle in matrix(2D array)
body: <p>Which algorithm to use to get points of filled circle?</p>
  
  <pre><code>int start_X = 30; // center point
  int start_Y = 30;
  
  int r = 5;
  
  // current point
  int x; 
  int y;
  
  if(?==true)
  {
  map2D[x][y] = 1; // for filled circle points
  }
  </code></pre>