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Control.RectangleToScreen Method

Computes the size and location of the specified client rectangle in screen coordinates.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

'Declaration
Public Function RectangleToScreen ( _
	r As Rectangle _
) As Rectangle

Parameters

r
Type: System.Drawing.Rectangle

The client coordinate Rectangle to convert.

Return Value

Type: System.Drawing.Rectangle
A Rectangle that represents the converted Rectangle, p, in screen coordinates.

The following code example demonstrates how to use the BackColor, RectangleToScreen, PointToScreen, MouseButtons, ControlPaint.DrawReversibleFrame, and Rectangle.IntersectsWith members. To run the example, paste the following code in a form called Form1 containing several controls. This example requires that the MouseDown, MouseMove, and MouseUp events are connected to the event handlers defined in the example.

' The following three methods will draw a rectangle and allow  
' the user to use the mouse to resize the rectangle.  If the  
' rectangle intersects a control's client rectangle, the  
' control's color will change. 

Dim isDrag As Boolean = False 
Dim theRectangle As New rectangle(New Point(0, 0), New Size(0, 0))
Dim startPoint As Point

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As _
    System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

    ' Set the isDrag variable to true and get the starting point  
    ' by using the PointToScreen method to convert form coordinates to 
    ' screen coordinates. 
    If (e.Button = MouseButtons.Left) Then
        isDrag = True 
    End If 

    Dim control As Control = CType(sender, Control)

    ' Calculate the startPoint by using the PointToScreen  
    ' method.
    startPoint = control.PointToScreen(New Point(e.X, e.Y))
End Sub 

Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove

    ' If the mouse is being dragged, undraw and redraw the rectangle 
    ' as the mouse moves. 
    If (isDrag) Then 

        ' Hide the previous rectangle by calling the DrawReversibleFrame  
        ' method with the same parameters.
        ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
            FrameStyle.Dashed)

        ' Calculate the endpoint and dimensions for the new rectangle,  
        ' again using the PointToScreen method. 
        Dim endPoint As Point = CType(sender, Control).PointToScreen(New Point(e.X, e.Y))
        Dim width As Integer = endPoint.X - startPoint.X
        Dim height As Integer = endPoint.Y - startPoint.Y
        theRectangle = New Rectangle(startPoint.X, startPoint.Y, _
            width, height)

        ' Draw the new rectangle by calling DrawReversibleFrame again.  
        ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
             FrameStyle.Dashed)
    End If 
End Sub 

Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp

    ' If the MouseUp event occurs, the user is not dragging.
    isDrag = False 

    ' Draw the rectangle to be evaluated. Set a dashed frame style  
    ' using the FrameStyle enumeration.
    ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
        FrameStyle.Dashed)

    ' Find out which controls intersect the rectangle and change their color. 
    ' The method uses the RectangleToScreen method to convert the  
    ' Control's client coordinates to screen coordinates. 
    Dim i As Integer 
    Dim controlRectangle As Rectangle
    For i = 0 To Controls.Count - 1
        controlRectangle = Controls(i).RectangleToScreen _
            (Controls(i).ClientRectangle)
        If controlRectangle.IntersectsWith(theRectangle) Then
            Controls(i).BackColor = Color.BurlyWood
        End If 
    Next 

    ' Reset the rectangle.
    theRectangle = New Rectangle(0, 0, 0, 0)
End Sub

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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