Region.Union 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 更新为其自身与指定 GraphicsPath 的并集。

重载

Union(GraphicsPath)	将此 Region 更新为其自身与指定 GraphicsPath 的并集。
Union(Rectangle)	将此 Region 更新为其自身与指定 Rectangle 结构的并集。
Union(RectangleF)	将此 Region 更新为其自身与指定 RectangleF 结构的并集。
Union(Region)	将此 Region 更新为其自身与指定 Region 的并集。

Union(GraphicsPath)

Source:

Region.cs

将此 Region 更新为其自身与指定 GraphicsPath 的并集。

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

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

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

Public Sub Union (path As GraphicsPath)

参数

path

GraphicsPath

要与此 GraphicsPath 合并的 Region。

例外

ArgumentNullException

path 为 null。

示例

有关代码示例，请参阅 Union(RectangleF) 和 Complement(GraphicsPath) 方法。

Union(Rectangle)

Source:

Region.cs

将此 Region 更新为其自身与指定 Rectangle 结构的并集。

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

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

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

Public Sub Union (rect As Rectangle)

参数

rect

Rectangle

要与此 Rectangle 合并的 Region 结构。

示例

有关代码示例，请参阅 Union(RectangleF) 方法。

Union(RectangleF)

Source:

Region.cs

将此 Region 更新为其自身与指定 RectangleF 结构的并集。

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

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

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

Public Sub Union (rect As RectangleF)

参数

rect

RectangleF

要与此 RectangleF 合并的 Region 结构。

示例

以下代码示例旨在与 Windows 窗体 一起使用，它需要 PaintEventArgse。 此代码执行以下操作：

• 创建第一个矩形并将其绘制到黑色屏幕。

• 创建第二个矩形，并将其绘制到红色屏幕。

• 使用第一个矩形创建区域。

• 获取与 complementRect组合时 的myRegion联合区域。

• 用蓝色填充并集区域，并将其绘制到屏幕。

请注意，两个矩形都用蓝色填充，包括重叠区域。

void Union_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 unionRect = RectangleF(90,30,100,100);
   e->Graphics->DrawRectangle( Pens::Red, Rectangle::Round( unionRect ) );

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

   // Get the area of union for myRegion when combined with
   // complementRect.
   myRegion->Union( unionRect );

   // Fill the union area of myRegion with blue.
   SolidBrush^ myBrush = gcnew SolidBrush( Color::Blue );
   e->Graphics->FillRegion( myBrush, myRegion );
}

public void Union_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 unionRect = new RectangleF(90, 30, 100, 100);
    e.Graphics.DrawRectangle(Pens.Red,
        Rectangle.Round(unionRect));
             
    // Create a region using the first rectangle.
    Region myRegion = new Region(regionRect);
             
    // Get the area of union for myRegion when combined with
             
    // complementRect.
    myRegion.Union(unionRect);
             
    // Fill the union area of myRegion with blue.
    SolidBrush myBrush = new SolidBrush(Color.Blue);
    e.Graphics.FillRegion(myBrush, myRegion);
}

Public Sub Union_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 unionRect As New RectangleF(90, 30, 100, 100)
    e.Graphics.DrawRectangle(Pens.Red, Rectangle.Round(unionRect))

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

    ' Get the area of union for myRegion when combined with
    ' complementRect.
    myRegion.Union(unionRect)

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

Union(Region)

Source:

Region.cs

将此 Region 更新为其自身与指定 Region 的并集。

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

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

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

Public Sub Union (region As Region)

参数

region

Region

要与此 Region 合并的 Region。

例外

ArgumentNullException

region 为 null。

示例

有关代码示例，请参阅 Union(RectangleF) 和 Complement(GraphicsPath) 方法。