Rectangle.Union(Rectangle, Rectangle) Method
Definition
Important
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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
Parameters
A rectangle to union.
A rectangle to union.
Returns
A Rectangle structure that bounds the union of the two Rectangle structures.
Examples
The following code example demonstrates how to use the Union method. This example is designed for use with a Windows Form. Paste this code into a form and call the ShowRectangleUnion
method when handling the form's Paint event, passing e
as 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
Remarks
When one of the two rectangles is empty, meaning all of its values are zero, the Union method returns a rectangle with a starting point of (0, 0), and the height and width of the non-empty rectangle. For example, if you have two rectangles: A = (0, 0; 0, 0) and B = (1, 1; 2, 2), then the union of A and B is (0, 0; 2, 2).
Applies to
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