Export (0) Print
Expand All

PaintEventArgs.Graphics Property

Gets the graphics used to paint.

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

'Declaration
Public ReadOnly Property Graphics As Graphics

Property Value

Type: System.Drawing.Graphics
The Graphics object used to paint. The Graphics object provides methods for drawing objects on the display device.

The following example demonstrates handling the Paint event and using the PaintEventArgs class to draw rectangles on the form. The MouseDown and MouseUp events are handled to determine the size of the rectangle. The example also demonstrates the Invalidate method to invalidate the area of the rectangle, causing it to be redrawn.

Dim RcDraw As Rectangle
    Dim PenWidth As Integer = 5


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

        ' Determine the initial rectangle coordinates...

        RcDraw.X = e.X
        RcDraw.Y = e.Y

    End Sub 

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

        ' Determine the width and height of the rectangle... 

        If e.X < RcDraw.X Then
            RcDraw.Width = RcDraw.X - e.X
            RcDraw.X = e.X
        Else
            RcDraw.Width = e.X - RcDraw.X
        End If 

        If e.Y < RcDraw.Y Then
            RcDraw.Height = RcDraw.Y - e.Y
            RcDraw.Y = e.Y
        Else
            RcDraw.Height = e.Y - RcDraw.Y
        End If 

        ' Force a repaint of the region occupied by the rectangle... 

        Me.Invalidate(RcDraw)

    End Sub 

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint

        ' Draw the rectangle...

        e.Graphics.DrawRectangle(New Pen(Color.Blue, PenWidth), RcDraw)

    End Sub
' This example creates a PictureBox control on the form and draws to it.  
' This example assumes that the Form_Load event handler method is connected  
' to the Load event of the form. 
Private pictureBox1 As New PictureBox()

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
    ' Dock the PictureBox to the form and set its background to white.
    pictureBox1.Dock = DockStyle.Fill
    pictureBox1.BackColor = Color.White
    ' Connect the Paint event of the PictureBox to the event handler method. 
    AddHandler pictureBox1.Paint, AddressOf Me.pictureBox1_Paint

    ' Add the PictureBox control to the Form. 
    Me.Controls.Add(pictureBox1)
End Sub 'Form1_Load


Private Sub pictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs)
    ' Create a local version of the graphics object for the PictureBox. 
    Dim g As Graphics = e.Graphics

    ' Draw a string on the PictureBox.
    g.DrawString("This is a diagonal line drawn on the control", _
        New Font("Arial", 10), Brushes.Red, New PointF(30.0F, 30.0F))
    ' Draw a line in the PictureBox.
    g.DrawLine(System.Drawing.Pens.Red, pictureBox1.Left, _ 
        pictureBox1.Top, pictureBox1.Right, pictureBox1.Bottom)
End Sub 'pictureBox1_Paint

.NET Framework

Supported in: 4.5.2, 4.5.1, 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.

Show:
© 2014 Microsoft