RectangleF.Union(RectangleF, RectangleF) Método

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

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

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

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

Parâmetros

Retornos

Uma terceira estrutura RectangleF que contém os dois retângulos que formam a união.

Exemplos

Este exemplo foi projetado para uso com Windows Forms e requer PaintEventArgs e, um OnPaint objeto de evento. O código cria dois RectangleF s e os desenha na tela em preto e vermelho. Observe que eles precisam ser convertidos Rectangle em s para fins de desenho. Em seguida, o código cria um terceiro RectangleF usando o método , converte-o Union em um Rectanglee desenha-o na tela em azul. Observe que o terceiro retângulo (azul) é o menor retângulo possível que pode conter ambos os outros dois retângulos:

public:
   void RectangleFUnionExample( PaintEventArgs^ e )
   {
      // Create two rectangles and draw them to the screen.
      RectangleF firstRectangleF = RectangleF(0,0,75,50);
      RectangleF secondRectangleF = RectangleF(100,100,20,20);

      // Convert the RectangleF structures to Rectangle structures and draw them to the
      // screen.
      Rectangle firstRect = Rectangle::Truncate( firstRectangleF );
      Rectangle secondRect = Rectangle::Truncate( secondRectangleF );
      e->Graphics->DrawRectangle( Pens::Black, firstRect );
      e->Graphics->DrawRectangle( Pens::Red, secondRect );

      // Get the union rectangle.
      RectangleF unionRectangleF = RectangleF::Union( firstRectangleF, secondRectangleF );

      // Draw the unionRectangleF to the screen.
      Rectangle unionRect = Rectangle::Truncate( unionRectangleF );
      e->Graphics->DrawRectangle( Pens::Blue, unionRect );
   }

public void RectangleFUnionExample(PaintEventArgs e)
{
             
    // Create two rectangles and draw them to the screen.
    RectangleF firstRectangleF = new RectangleF(0, 0, 75, 50);
    RectangleF secondRectangleF = new RectangleF(100, 100, 20, 20);
             
    // Convert the RectangleF structures to Rectangle structures and draw them to the
             
    // screen.
    Rectangle firstRect = Rectangle.Truncate(firstRectangleF);
    Rectangle secondRect = Rectangle.Truncate(secondRectangleF);
    e.Graphics.DrawRectangle(Pens.Black, firstRect);
    e.Graphics.DrawRectangle(Pens.Red, secondRect);
             
    // Get the union rectangle.
    RectangleF unionRectangleF = RectangleF.Union(firstRectangleF,
        secondRectangleF);
             
    // Draw the unionRectangleF to the screen.
    Rectangle unionRect = Rectangle.Truncate(unionRectangleF);
    e.Graphics.DrawRectangle(Pens.Blue, unionRect);
}

Public Sub RectangleFUnionExample(ByVal e As PaintEventArgs)

    ' Create two rectangles and draw them to the screen.
    Dim firstRectangleF As New RectangleF(0, 0, 75, 50)
    Dim secondRectangleF As New RectangleF(100, 100, 20, 20)

    ' Convert the RectangleF structures to Rectangle structures and

    ' draw them to the screen.
    Dim firstRect As Rectangle = Rectangle.Truncate(firstRectangleF)
    Dim secondRect As Rectangle = Rectangle.Truncate(secondRectangleF)
    e.Graphics.DrawRectangle(Pens.Black, firstRect)
    e.Graphics.DrawRectangle(Pens.Red, secondRect)

    ' Get the union rectangle.
    Dim unionRectangleF As RectangleF = _
    RectangleF.Union(firstRectangleF, secondRectangleF)

    ' Draw the unionRectangleF to the screen.
    Dim unionRect As Rectangle = Rectangle.Truncate(unionRectangleF)
    e.Graphics.DrawRectangle(Pens.Blue, unionRect)
End Sub

Comentários

Quando um dos dois retângulos está vazio, o que significa que todos os seus valores são zero, o Union método retorna um retângulo com um ponto inicial de (0, 0) e a altura e largura do retângulo não vazio. Por exemplo, se você tiver dois retângulos A = (0, 0; 0, 0) e B = (1, 1; 2, 2), a união de A e B será (0, 0; 2, 2).

Aplica-se a