Region.MakeEmpty 方法

定義

命名空間:

System.Drawing

組件:

System.Drawing.Common.dll

套件:

System.Drawing.Common v8.0.0

來源:

Region.cs

將這個 Region 初始化為空的內部。

public:
 void MakeEmpty();

public void MakeEmpty ();

member this.MakeEmpty : unit -> unit

Public Sub MakeEmpty ()

範例

下列程式代碼範例示範如何使用 建 Region 構函式和 MakeEmpty 方法。 此範例的設計目的是要與 Windows Forms 搭配使用。 Create 表單，並將下列程式代碼貼到窗體中。 FillEmptyRegion在表單的事件Paint處理方法中呼叫 方法，傳遞e為 PaintEventArgs。

private:
   void FillEmptyRegion( PaintEventArgs^ e )
   {
      // Create a region from a rectangle.
      Rectangle originalRectangle = Rectangle(40,40,40,50);
      System::Drawing::Region^ smallRegion = gcnew System::Drawing::Region( originalRectangle );

      // Call MakeEmpty.
      smallRegion->MakeEmpty();

      // Fill the region in red and draw the original rectangle
      // in black. Note there is nothing filled in.
      e->Graphics->FillRegion( Brushes::Red, smallRegion );
      e->Graphics->DrawRectangle( Pens::Black, originalRectangle );
   }

private void FillEmptyRegion(PaintEventArgs e)
{

    // Create a region from a rectangle.
    Rectangle originalRectangle = new Rectangle(40, 40, 40, 50);
    Region smallRegion = new Region(originalRectangle);

    // Call MakeEmpty.
    smallRegion.MakeEmpty();

    // Fill the region in red and draw the original rectangle
    // in black. Note there is nothing filled in.
    e.Graphics.FillRegion(Brushes.Red, smallRegion);
    e.Graphics.DrawRectangle(Pens.Black, originalRectangle);
}

Private Sub FillEmptyRegion(ByVal e As PaintEventArgs)

    ' Create a region from a rectangle.
    Dim originalRectangle As New Rectangle(40, 40, 40, 50)
    Dim smallRegion As New Region(originalRectangle)

    ' Call MakeEmpty.
    smallRegion.MakeEmpty()

    ' Fill the region in red and draw the original rectangle
    ' in black. Note there is nothing filled in.
    e.Graphics.FillRegion(Brushes.Red, smallRegion)
    e.Graphics.DrawRectangle(Pens.Black, originalRectangle)

End Sub