Rectangle.Union(Rectangle, Rectangle) 方法

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Primitives.dll

Source:

Rectangle.cs

获取包含两个 Rectangle 结构的交集的 Rectangle 结构。

public:
 static System::Drawing::Rectangle Union(System::Drawing::Rectangle a, System::Drawing::Rectangle b);

public static System.Drawing.Rectangle Union (System.Drawing.Rectangle a, System.Drawing.Rectangle b);

static member Union : System.Drawing.Rectangle * System.Drawing.Rectangle -> System.Drawing.Rectangle

Public Shared Function Union (a As Rectangle, b As Rectangle) As Rectangle

参数

a

Rectangle

要合并的矩形。

b

Rectangle

要合并的矩形。

返回

Rectangle

包含两个 Rectangle 结构的交集的 Rectangle 结构。

示例

下面的代码示例演示如何使用 Union 方法。 此示例旨在与 Windows 窗体一起使用。 将此代码粘贴到窗体中，并在处理窗体的 Paint 事件时调用 ShowRectangleUnion 方法，作为 ePaintEventArgs传递。

private:
   void ShowRectangleUnion( PaintEventArgs^ e )
   {
      // Declare two rectangles and draw them.
      Rectangle rectangle1 = Rectangle(30,40,50,100);
      Rectangle rectangle2 = Rectangle(50,60,100,60);
      e->Graphics->DrawRectangle( Pens::Sienna, rectangle1 );
      e->Graphics->DrawRectangle( Pens::BlueViolet, rectangle2 );

      // Declare a third rectangle as a union of the first two.
      Rectangle rectangle3 = Rectangle::Union( rectangle1, rectangle2 );

      // Fill in the third rectangle in a semi-transparent color.
      Color transparentColor = Color::FromArgb( 40, 135, 135, 255 );
      e->Graphics->FillRectangle( gcnew SolidBrush( transparentColor ), rectangle3 );
   }

private void ShowRectangleUnion(PaintEventArgs e)
{

    // Declare two rectangles and draw them.
    Rectangle rectangle1 = new Rectangle(30, 40, 50, 100);
    Rectangle rectangle2 = new Rectangle(50, 60, 100, 60);
    e.Graphics.DrawRectangle(Pens.Sienna, rectangle1);
    e.Graphics.DrawRectangle(Pens.BlueViolet, rectangle2);

    // Declare a third rectangle as a union of the first two.
    Rectangle rectangle3 = Rectangle.Union(rectangle1, rectangle2);

    // Fill in the third rectangle in a semi-transparent color.
    Color transparentColor = Color.FromArgb(40, 135, 135, 255);
    e.Graphics.FillRectangle(new SolidBrush(transparentColor), rectangle3);
}

Private Sub ShowRectangleUnion(ByVal e As PaintEventArgs)

    ' Declare two rectangles and draw them.
    Dim rectangle1 As New Rectangle(30, 40, 50, 100)
    Dim rectangle2 As New Rectangle(50, 60, 100, 60)
    e.Graphics.DrawRectangle(Pens.Sienna, rectangle1)
    e.Graphics.DrawRectangle(Pens.BlueViolet, rectangle2)

    ' Declare a third rectangle as a union of the first two.
    Dim rectangle3 As Rectangle = Rectangle.Union(rectangle1, _
        rectangle2)

    ' Fill in the third rectangle in a semi-transparent color.
    Dim transparentColor As Color = Color.FromArgb(40, 135, 135, 255)
    e.Graphics.FillRectangle(New SolidBrush(transparentColor), _
        rectangle3)
End Sub

注解

当两个矩形中的一个为空（这意味着其所有值均为零）时 Union ，该方法将返回一个矩形，其起始点为 (0,0) ，以及非空矩形的高度和宽度。 例如，如果有两个矩形：A = (0， 0;0， 0) ，B = (1， 1;2、 2) ，则 A 和 B 的并集 (0， 0：2、2) 。