Region.Exclude 方法

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v8.0.0

将此 Region 更新为其内部与指定的 Rectangle 结构不相交的部分。

重载

Exclude(Region)	更新此 Region，以仅包含其内部与指定的 Region 不相交的部分。
Exclude(GraphicsPath)	更新此 Region，以仅包含其内部与指定的 GraphicsPath 不相交的部分。
Exclude(Rectangle)	更新此 Region，以仅包含其内部与指定的 Rectangle 结构不相交的部分。
Exclude(RectangleF)	更新此 Region，以仅包含其内部与指定的 RectangleF 结构不相交的部分。

Exclude(Region)

Source:

Region.cs

更新此 Region，以仅包含其内部与指定的 Region 不相交的部分。

public:
 void Exclude(System::Drawing::Region ^ region);

public void Exclude (System.Drawing.Region region);

member this.Exclude : System.Drawing.Region -> unit

Public Sub Exclude (region As Region)

参数

region

Region

要从此 Region 中排除的 Region。

例外

ArgumentNullException

region 为 null。

示例

有关代码示例，请参阅 Exclude(RectangleF) 和 Complement(Region) 方法。

Exclude(GraphicsPath)

Source:

Region.cs

更新此 Region，以仅包含其内部与指定的 GraphicsPath 不相交的部分。

public:
 void Exclude(System::Drawing::Drawing2D::GraphicsPath ^ path);

public void Exclude (System.Drawing.Drawing2D.GraphicsPath path);

member this.Exclude : System.Drawing.Drawing2D.GraphicsPath -> unit

Public Sub Exclude (path As GraphicsPath)

参数

path

GraphicsPath

要从此 GraphicsPath 中排除的 Region。

例外

ArgumentNullException

path 为 null。

示例

下面的代码示例演示构造 Region 函数和 Exclude 和 Dispose 方法。

此示例旨在与 Windows 窗体 一起使用。 将代码粘贴到窗体中， FillRegionExcludingPath 并在处理窗体 Paint 的事件时调用 方法，作为 ePaintEventArgs传递。

private:
   void FillRegionExcludingPath( PaintEventArgs^ e )
   {
      // Create the region using a rectangle.
      System::Drawing::Region^ myRegion = gcnew System::Drawing::Region( Rectangle(20,20,100,100) );

      // Create the GraphicsPath.
      System::Drawing::Drawing2D::GraphicsPath^ path = gcnew System::Drawing::Drawing2D::GraphicsPath;

      // Add a circle to the graphics path.
      path->AddEllipse( 50, 50, 25, 25 );

      // Exclude the circle from the region.
      myRegion->Exclude( path );

      // Retrieve a Graphics object from the form.
      Graphics^ formGraphics = e->Graphics;

      // Fill the region in blue.
      formGraphics->FillRegion( Brushes::Blue, myRegion );

      // Dispose of the path and region objects.
      delete path;
      delete myRegion;
   }

private void FillRegionExcludingPath(PaintEventArgs e)
{

    // Create the region using a rectangle.
    Region myRegion = new Region(new Rectangle(20, 20, 100, 100));

    // Create the GraphicsPath.
    System.Drawing.Drawing2D.GraphicsPath path = 
        new System.Drawing.Drawing2D.GraphicsPath();

    // Add a circle to the graphics path.
    path.AddEllipse(50, 50, 25, 25);

    // Exclude the circle from the region.
    myRegion.Exclude(path);

    // Retrieve a Graphics object from the form.
    Graphics formGraphics = e.Graphics;

    // Fill the region in blue.
    formGraphics.FillRegion(Brushes.Blue, myRegion);

    // Dispose of the path and region objects.
    path.Dispose();
    myRegion.Dispose();
}

Private Sub FillRegionExcludingPath(ByVal e As PaintEventArgs)

    ' Create the region using a rectangle.
    Dim myRegion As New Region(New Rectangle(20, 20, 100, 100))

    ' Create the GraphicsPath.
    Dim path As New System.Drawing.Drawing2D.GraphicsPath

    ' Add a circle to the graphics path.
    path.AddEllipse(50, 50, 25, 25)

    ' Exclude the circle from the region.
    myRegion.Exclude(path)

    ' Retrieve a Graphics object from the form.
    Dim formGraphics As Graphics = e.Graphics

    ' Fill the region in blue.
    formGraphics.FillRegion(Brushes.Blue, myRegion)

    ' Dispose of the path and region objects.
    path.Dispose()
    myRegion.Dispose()

End Sub

Exclude(Rectangle)

Source:

Region.cs

更新此 Region，以仅包含其内部与指定的 Rectangle 结构不相交的部分。

public:
 void Exclude(System::Drawing::Rectangle rect);

public void Exclude (System.Drawing.Rectangle rect);

member this.Exclude : System.Drawing.Rectangle -> unit

Public Sub Exclude (rect As Rectangle)

参数

rect

Rectangle

要从此 Rectangle 中排除的 Region 结构。

示例

有关代码示例，请参阅 Exclude(RectangleF) 方法。

Exclude(RectangleF)

Source:

Region.cs

更新此 Region，以仅包含其内部与指定的 RectangleF 结构不相交的部分。

public:
 void Exclude(System::Drawing::RectangleF rect);

public void Exclude (System.Drawing.RectangleF rect);

member this.Exclude : System.Drawing.RectangleF -> unit

Public Sub Exclude (rect As RectangleF)

参数

rect

RectangleF

要从此 RectangleF 中排除的 Region 结构。

示例

以下示例旨在与 Windows 窗体 一起使用，它需要 PaintEventArgse，这是事件处理程序的参数Paint。 此代码执行以下操作：

• 创建一个矩形并将其绘制到黑色屏幕

• 创建与第一个相交的第二个矩形，并将其绘制到红色屏幕。

• 使用第一个矩形创建区域。

• 获取与第二个矩形组合时区域的非排除区域。

• 用蓝色填充非排除区域并将其绘制到屏幕。

请注意，不与矩形相交的区域的区域的颜色为蓝色。

public:
   void Exclude_RectF_Example( PaintEventArgs^ e )
   {
      // Create the first rectangle and draw it to the screen in black.
      Rectangle regionRect = Rectangle(20,20,100,100);
      e->Graphics->DrawRectangle( Pens::Black, regionRect );

      // Create the second rectangle and draw it to the screen in red.
      RectangleF complementRect = RectangleF(90,30,100,100);
      e->Graphics->DrawRectangle( Pens::Red, Rectangle::Round( complementRect ) );

      // Create a region using the first rectangle.
      System::Drawing::Region^ myRegion = gcnew System::Drawing::Region( regionRect );

      // Get the nonexcluded area of myRegion when combined with
      // complementRect.
      myRegion->Exclude( complementRect );
      
      // Fill the nonexcluded area of myRegion with blue.
      SolidBrush^ myBrush = gcnew SolidBrush( Color::Blue );
      e->Graphics->FillRegion( myBrush, myRegion );
   }

public void Exclude_RectF_Example(PaintEventArgs e)
{
             
    // Create the first rectangle and draw it to the screen in black.
    Rectangle regionRect = new Rectangle(20, 20, 100, 100);
    e.Graphics.DrawRectangle(Pens.Black, regionRect);
             
    // Create the second rectangle and draw it to the screen in red.
    RectangleF complementRect = new RectangleF(90, 30, 100, 100);
    e.Graphics.DrawRectangle(Pens.Red,
        Rectangle.Round(complementRect));
             
    // Create a region using the first rectangle.
    Region myRegion = new Region(regionRect);
             
    // Get the nonexcluded area of myRegion when combined with
             
    // complementRect.
    myRegion.Exclude(complementRect);
             
    // Fill the nonexcluded area of myRegion with blue.
    SolidBrush myBrush = new SolidBrush(Color.Blue);
    e.Graphics.FillRegion(myBrush, myRegion);
}

Public Sub Exclude_RectF_Example(ByVal e As PaintEventArgs)

    ' Create the first rectangle and draw it to the screen in black.
    Dim regionRect As New Rectangle(20, 20, 100, 100)
    e.Graphics.DrawRectangle(Pens.Black, regionRect)

    ' create the second rectangle and draw it to the screen in red.
    Dim complementRect As New RectangleF(90, 30, 100, 100)
    e.Graphics.DrawRectangle(Pens.Red, _
    Rectangle.Round(complementRect))

    ' Create a region using the first rectangle.
    Dim myRegion As New [Region](regionRect)

    ' Get the nonexcluded area of myRegion when combined with
    ' complementRect.
    myRegion.Exclude(complementRect)

    ' Fill the nonexcluded area of myRegion with blue.
    Dim myBrush As New SolidBrush(Color.Blue)
    e.Graphics.FillRegion(myBrush, myRegion)
End Sub