Region.Union 方法

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v9.0.0-preview.6.24327.6

将此 Region 更新为其自身的并集和指定的 GraphicsPath。

重载

Union(GraphicsPath)	将此 Region 更新为其自身的并集和指定的 GraphicsPath。
Union(Rectangle)	将此 Region 更新为其自身的并集和指定的 Rectangle 结构。
Union(RectangleF)	将此 Region 更新为其自身的并集和指定的 RectangleF 结构。
Union(Region)	将此 Region 更新为其自身的并集和指定的 Region。

Union(GraphicsPath)

Source:

Region.cs

将此 Region 更新为其自身的并集和指定的 GraphicsPath。

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

要与这个 Region团结在一起的 GraphicsPath。

例外

ArgumentNullException

path 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 更新为其自身的并集和指定的 Rectangle 结构。

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 Region团结在一起的 Rectangle 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 更新为其自身的并集和指定的 RectangleF 结构。

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 Region团结在一起的 RectangleF 结构。

示例

下面的代码示例设计用于 Windows 窗体，并且需要 PaintEventArgse。 该代码执行以下操作：

• 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结合使用时 myRegion 的联合区域。

• 用蓝色填充并集区域，并将其绘制到屏幕。

请注意，这两个矩形都填充有蓝色，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 更新为其自身的并集和指定的 Region。

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

要与这个 Region团结在一起的 Region。

例外

ArgumentNullException

region null。

示例

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