Rectangle.Intersect Method (Rectangle, Rectangle) (System.Drawing)

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.NET Framework Class Library

Rectangle.Intersect Method (Rectangle, Rectangle)

Returns a third Rectangle structure that represents the intersection of two other Rectangle structures. If there is no intersection, an empty Rectangle is returned.

Namespace: System.Drawing
Assembly: System.Drawing (in System.Drawing.dll)

Syntax

Visual Basic

Public Shared Function Intersect ( _
	a As Rectangle, _
	b As Rectangle _
) As Rectangle

public static Rectangle Intersect(
	Rectangle a,
	Rectangle b
)

Visual C++

public:
static Rectangle Intersect(
	Rectangle a, 
	Rectangle b
)

static member Intersect : 
        a:Rectangle * 
        b:Rectangle -> Rectangle

Parameters

a: Type: System.Drawing.Rectangle
A rectangle to intersect.

b: Type: System.Drawing.Rectangle
A rectangle to intersect.

Return Value

Type: System.Drawing.Rectangle
A Rectangle that represents the intersection of a and b.

Examples

The following code example demonstrates the Intersect, IsEmpty and the IntersectsWith members. This example should be used with a Windows Form. Paste this code into a form and call this method when handling the form's Paint event, passing e as PaintEventArgs.

Visual Basic


Private Sub StaticRectangleIntersection(ByVal e As PaintEventArgs)
    Dim rectangle1 As New Rectangle(50, 50, 200, 100)
    Dim rectangle2 As New Rectangle(70, 20, 100, 200)
    Dim rectangle3 As New Rectangle

    e.Graphics.DrawRectangle(Pens.Black, rectangle1)
    e.Graphics.DrawRectangle(Pens.Red, rectangle2)

    If (rectangle1.IntersectsWith(rectangle2)) Then
        rectangle3 = Rectangle.Intersect(rectangle1, rectangle2)
        If Not rectangle3.IsEmpty Then
            e.Graphics.FillRectangle(Brushes.Green, rectangle3)
        End If
    End If
End Sub


private void StaticRectangleIntersection(PaintEventArgs e)
{
    Rectangle rectangle1 = new Rectangle(50, 50, 200, 100);
    Rectangle rectangle2 = new Rectangle(70, 20, 100, 200);
    Rectangle rectangle3 = new Rectangle();

    e.Graphics.DrawRectangle(Pens.Black, rectangle1);
    e.Graphics.DrawRectangle(Pens.Red, rectangle2);

    if (rectangle1.IntersectsWith(rectangle2))
    {
        rectangle3 = Rectangle.Intersect(rectangle1, rectangle2);
        if (!rectangle3.IsEmpty)
        {
            e.Graphics.FillRectangle(Brushes.Green, rectangle3);
        }
    }
}

Visual C++


private:
   void StaticRectangleIntersection( PaintEventArgs^ e )
   {
      Rectangle rectangle1 = Rectangle(50,50,200,100);
      Rectangle rectangle2 = Rectangle(70,20,100,200);
      e->Graphics->DrawRectangle( Pens::Black, rectangle1 );
      e->Graphics->DrawRectangle( Pens::Red, rectangle2 );
      if ( rectangle1.IntersectsWith( rectangle2 ) )
      {
         Rectangle rectangle3 = Rectangle::Intersect( rectangle1, rectangle2 );
         if (  !rectangle3.IsEmpty )
         {
            e->Graphics->FillRectangle( Brushes::Green, rectangle3 );
         }
      }
   }

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

Rectangle Structure

Intersect Overload

System.Drawing Namespace

Community Content

cyclotis04

Use caution with negatively-sized rectangles

Rectangles do not intersect as expected when given negative sizes. Consider redefining them manually to positive sizes before using this method.

  
    
      
    
          var
       r  
      =
      
      new
      
      Rectangle
      (
      0
      ,
      
      0
      ,
        
      3
      ,
        
      3
      );
      
        

      
      var
       r0 
      =
      
      new
      
      Rectangle
      (
      0
      ,
      
      0
      ,
      
      -
      1
      ,
      
      -
      1
      );
      
        

      
      var
       r1 
      =
      
      new
      
      Rectangle
      (
      1
      ,
      
      1
      ,
      
      -
      1
      ,
      
      -
      1
      );
      
        

      
      var
       r2 
      =
      
      new
      
      Rectangle
      (
      2
      ,
      
      2
      ,
      
      -
      1
      ,
      
      -
      1
      );
      
        

      
      var
       r3 
      =
      
      new
      
      Rectangle
      (
      3
      ,
      
      3
      ,
      
      -
      1
      ,
      
      -
      1
      );
      
        

        

      
      System
      .
      Console
      .
      WriteLine
      (
      r
      .
      IntersectsWith
      (
      r0
      ));
      
      // False
      
        

      
      System
      .
      Console
      .
      WriteLine
      (
      r
      .
      IntersectsWith
      (
      r1
      ));
      
      // False
      
        

      
      System
      .
      Console
      .
      WriteLine
      (
      r
      .
      IntersectsWith
      (
      r2
      ));
      
      // True
      
        

      
      System
      .
      Console
      .
      WriteLine
      (
      r
      .
      IntersectsWith
      (
      r3
      ));
      
      // False