Rectangle.Intersection에서 나머지 바깥 사각형 찾기

Question

바깥 쪽 사각형과 안에 사각형이 있습니다. 교차하는 사각형을 잘라낸 후에 나머지 모든 사각형을 반환하려면 어떻게해야합니까?

Answer 1

이이 Region class을 사용하는 것입니다 대표하는 자연적인 방법, 무엇인가 : 당신이 정말로 Rectangle 구조의 목록을 원하는 경우

var result = new Region(outer); 
result.Exclude(inner); 

, 당신은 GetRegionScans를 사용 RectangleF s의 변환을 볼 수 있습니다 단위 행렬을 사용하여 으로 변환하면 Ceiling 또는 Floor을 사용합니다.

Answer 2

나는이 함수를 작성하여 교차하는 것을 제외한 목록을 반환합니다.

private IEnumerable<Rectangle> GetExternalRectangles(Rectangle surface, Rectangle test) 
    { 
     var result = new List<Rectangle>(); 

     if (!test.IntersectsWith(surface)) return new List<Rectangle> { surface }; 
     #region Top and Bottom 

     if (test.Top>surface.Top && test.Bottom < surface.Bottom) // test inside surface vertically 
     { 
      result.Add(new Rectangle(surface.Location, new Size(surface.Width, test.Top - surface.Top))); 
      result.Add(new Rectangle(new Point(surface.Left,test.Bottom), new Size(surface.Width, surface.Bottom-test.Bottom))); 
     } 
     if (test.Top > surface.Top && test.Bottom > surface.Bottom) // test inside surface vertically, overflow bottom 
     { 
      result.Add(new Rectangle(surface.Location, new Size(surface.Width, test.Top - surface.Top))); 
      //result.Add(new Rectangle(new Point(surface.Left,test.Bottom), new Size(surface.Width, surface.Bottom-test.Bottom))); 
     } 
     if (test.Top < surface.Top && test.Bottom < surface.Bottom) // test inside surface vertically, overflow top 
     { 
      //result.Add(new Rectangle(surface.Location, new Size(surface.Width, test.Top - surface.Top))); 
      result.Add(new Rectangle(new Point(surface.Left, test.Bottom), new Size(surface.Width, surface.Bottom - test.Bottom))); 
     } 

     #endregion 

     #region Lateral 
     if (test.Left > surface.Left && test.Right < surface.Right) // test inside surface horizontally 
     { 
      result.Add(new Rectangle(new Point(surface.Left,Math.Max(surface.Top,test.Top)), new Size(test.Left-surface.Left, Math.Min(surface.Bottom, test.Bottom)- Math.Max(surface.Top, test.Top)))); 
      result.Add(new Rectangle(new Point(test.Right, Math.Max(surface.Top, test.Top)), new Size(surface.Right - test.Right, Math.Min(surface.Bottom, test.Bottom) - Math.Max(surface.Top, test.Top)))); 
     } 
     if (test.Left > surface.Left && test.Right > surface.Right) // test inside surface horizontally, overflow right 
     { 
      result.Add(new Rectangle(new Point(surface.Left, Math.Max(surface.Top, test.Top)), new Size(test.Left - surface.Left, Math.Min(surface.Bottom, test.Bottom) - Math.Max(surface.Top, test.Top)))); 
      //result.Add(new Rectangle(new Point(test.Right, Math.Max(surface.Top, test.Top)), new Size(surface.Right - test.Right, Math.Min(surface.Bottom, test.Bottom) - Math.Max(surface.Top, test.Top)))); 
     } 
     if (test.Left < surface.Left && test.Right < surface.Right) // test inside surface horizontally, overflow left 
     { 
      //result.Add(new Rectangle(new Point(surface.Left, Math.Max(surface.Top, test.Top)), new Size(test.Left - surface.Left, Math.Min(surface.Bottom, test.Bottom) - Math.Max(surface.Top, test.Top)))); 
      result.Add(new Rectangle(new Point(test.Right, Math.Max(surface.Top, test.Top)), new Size(surface.Right - test.Right, Math.Min(surface.Bottom, test.Bottom) - Math.Max(surface.Top, test.Top)))); 
     } 
     #endregion 
     return result; 
    }