Region.GetBounds(Graphics) 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

取得 RectangleF 結構，表示在 Region 物件的繪圖介面上框住這個 Graphics 的矩形。

public:
 System::Drawing::RectangleF GetBounds(System::Drawing::Graphics ^ g);

public System.Drawing.RectangleF GetBounds (System.Drawing.Graphics g);

member this.GetBounds : System.Drawing.Graphics -> System.Drawing.RectangleF

Public Function GetBounds (g As Graphics) As RectangleF

參數

g

Graphics

在其上繪製 Graphics 的 Region。

傳回

RectangleF

RectangleF 結構，表示在指定之繪圖介面上這個 Region 的週框 (Bounding Rectangle)。

例外狀況

ArgumentNullException

g 為 null。

範例

下列程式代碼範例是設計來搭配 Windows Forms 使用，而且需要 PaintEventArgse，這是事件處理程序的參數Paint。 此程式碼會執行下列動作：

• 建立 ， GraphicsPath 並在其中新增省略號。

• 以藍色填滿路徑，並將它繪製到畫面。

• 建立使用的區域 GraphicsPath。

• 當與第二個矩形結合時，取得區域的非排除區域。

• 取得區域的周框，並以紅色繪製到畫面。

public:
   void GetBoundsExample( PaintEventArgs^ e )
   {
      // Create a GraphicsPath and add an ellipse to it.
      GraphicsPath^ myPath = gcnew GraphicsPath;
      Rectangle ellipseRect = Rectangle(20,20,100,100);
      myPath->AddEllipse( ellipseRect );

      // Fill the path with blue and draw it to the screen.
      SolidBrush^ myBrush = gcnew SolidBrush( Color::Blue );
      e->Graphics->FillPath( myBrush, myPath );

      // Create a region using the GraphicsPath.
      System::Drawing::Region^ myRegion = gcnew System::Drawing::Region( myPath );

      // Get the bounding rectangle for myRegion and draw it to the
      // screen in Red.
      RectangleF boundsRect = myRegion->GetBounds( e->Graphics );
      e->Graphics->DrawRectangle( Pens::Red, Rectangle::Round( boundsRect ) );
   }

public void GetBoundsExample(PaintEventArgs e)
{
             
    // Create a GraphicsPath and add an ellipse to it.
    GraphicsPath myPath = new GraphicsPath();
    Rectangle ellipseRect = new Rectangle(20, 20, 100, 100);
    myPath.AddEllipse(ellipseRect);
             
    // Fill the path with blue and draw it to the screen.
    SolidBrush myBrush = new SolidBrush(Color.Blue);
    e.Graphics.FillPath(myBrush, myPath);
             
    // Create a region using the GraphicsPath.
    Region myRegion = new Region(myPath);
             
    // Get the bounding rectangle for myRegion and draw it to the
             
    // screen in Red.
    RectangleF boundsRect = myRegion.GetBounds(e.Graphics);
    e.Graphics.DrawRectangle(Pens.Red, Rectangle.Round(boundsRect));
}

Public Sub GetBoundsExample(ByVal e As PaintEventArgs)

    ' Create a GraphicsPath and add an ellipse to it.
    Dim myPath As New GraphicsPath
    Dim ellipseRect As New Rectangle(20, 20, 100, 100)
    myPath.AddEllipse(ellipseRect)

    ' Fill the path with blue and draw it to the screen.
    Dim myBrush As New SolidBrush(Color.Blue)
    e.Graphics.FillPath(myBrush, myPath)

    ' Create a region using the GraphicsPath.
    Dim myRegion As New [Region](myPath)

    ' Get the bounding rectangle for myRegion and draw it to the
    ' screen in Red.
    Dim boundsRect As RectangleF = myRegion.GetBounds(e.Graphics)
    e.Graphics.DrawRectangle(Pens.Red, Rectangle.Round(boundsRect))
End Sub

備註

圖形內容的目前轉換是用來計算繪圖介面上的區域內部。 根據目前的轉換，周框不一定是最小的可能周框。