Rectangle.IsEmpty 屬性

定義

命名空間:

System.Drawing

組件:

System.Drawing.Primitives.dll

來源:

Rectangle.cs

測試這個 Rectangle 的所有數值屬性是否具有零值。

public:
 property bool IsEmpty { bool get(); };

[System.ComponentModel.Browsable(false)]
public bool IsEmpty { get; }

[<System.ComponentModel.Browsable(false)>]
member this.IsEmpty : bool

Public ReadOnly Property IsEmpty As Boolean

屬性值

Boolean

如果這個 Rectangle 的 Width、Height、X 和 Y 屬性都具有零值，則這個屬性會傳回 true，否則傳回 false。

屬性

BrowsableAttribute

範例

下列程式代碼範例示範 Intersect、 IsEmpty 和 IntersectsWith 成員。 此範例應該與 Windows Form 搭配使用。 將此程式代碼貼到表單中，並在處理表單的事件 Paint 時呼叫此方法，並 e 傳遞為 PaintEventArgs。

private:
   void InstanceRectangleIntersection( PaintEventArgs^ e )
   {
      Rectangle rectangle1 = Rectangle(50,50,200,100);
      Rectangle rectangle2 = Rectangle(70,20,100,200);
      e->Graphics->DrawRectangle( Pens::Black, rectangle1 );
      e->Graphics->DrawRectangle( Pens::Red, rectangle2 );
      if ( rectangle1.IntersectsWith( rectangle2 ) )
      {
         rectangle1.Intersect( rectangle2 );
         if (  !rectangle1.IsEmpty )
         {
            e->Graphics->FillRectangle( Brushes::Green, rectangle1 );
         }
      }
   }

private void InstanceRectangleIntersection(PaintEventArgs e)
{

    Rectangle rectangle1 = new Rectangle(50, 50, 200, 100);
    Rectangle rectangle2 = new Rectangle(70, 20, 100, 200);

    e.Graphics.DrawRectangle(Pens.Black, rectangle1);
    e.Graphics.DrawRectangle(Pens.Red, rectangle2);

    if (rectangle1.IntersectsWith(rectangle2))
    {
        rectangle1.Intersect(rectangle2);
        if (!rectangle1.IsEmpty)
        {
            e.Graphics.FillRectangle(Brushes.Green, rectangle1);
        }
    }
}

  Private Sub InstanceRectangleIntersection( _
      ByVal e As PaintEventArgs)

      Dim rectangle1 As New Rectangle(50, 50, 200, 100)
      Dim rectangle2 As New Rectangle(70, 20, 100, 200)

      e.Graphics.DrawRectangle(Pens.Black, rectangle1)
      e.Graphics.DrawRectangle(Pens.Red, rectangle2)

      If (rectangle1.IntersectsWith(rectangle2)) Then
          rectangle1.Intersect(rectangle2)
          If Not (rectangle1.IsEmpty) Then
              e.Graphics.FillRectangle(Brushes.Green, rectangle1)
          End If
      End If
  End Sub