Rectangle.Union(Rectangle, Rectangle) 方法

定義

命名空間:

System.Drawing

組件:

netstandard.dll, System.Drawing.Primitives.dll

來源:

Rectangle.cs

得到 Rectangle 包含兩個 Rectangle 結構聯集的結構。

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

參數

a

Rectangle

一個矩形到聯合。

b

Rectangle

一個矩形到聯合。

傳回

Rectangle

一個 Rectangle 界定兩個 Rectangle 結構合集的結構。

範例

以下程式碼範例示範如何使用此 Union 方法。 此範例設計用於 Windows 表單。 將此程式碼貼入表單，處理表單ShowRectangleUnion事件時呼叫該Paint方法，傳遞e為 PaintEventArgs。

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

備註

當其中一個矩形為空，表示所有值皆為零時，方法 Union 會回傳一個起始點為 （0， 0） 的矩形，並標示該矩形的高度與寬度。 例如，如果你有兩個矩形：A = （0， 0; 0， 0） 和 B = （1， 1; 2， 2），那麼 A 和 B 的聯集就是 （0， 0; 2， 2）。