VB.Net/Event/Mouse Draw

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Using the mouse to draw on a form

<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms Public Class MainClass

  Shared Sub Main()
       Dim myform As Form = New FrmPainter()
       Application.Run(myform)
  End Sub " Main

End Class Public Class FrmPainter

  Inherits System.Windows.Forms.Form
  Dim shouldPaint As Boolean = False
  1. Region " Windows Form Designer generated code "
  Public Sub New()
     MyBase.New()
     "This call is required by the Windows Form Designer.
     InitializeComponent()
     "Add any initialization after the InitializeComponent() call
  End Sub
  "Form overrides dispose to clean up the component list.
  Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
     If disposing Then
        If Not (components Is Nothing) Then
           components.Dispose()
        End If
     End If
     MyBase.Dispose(disposing)
  End Sub
  "Required by the Windows Form Designer
  Private components As System.ruponentModel.Container
  "NOTE: The following procedure is required by the Windows Form Designer
  "It can be modified using the Windows Form Designer.  
  "Do not modify it using the code editor.
  <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
     "
     "Form1
     "
     Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
     Me.ClientSize = New System.Drawing.Size(292, 273)
     Me.Name = "Form1"
     Me.Text = "Painter"
  End Sub
  1. End Region
  Private Sub FrmPainter_MouseMove( _
     ByVal sender As System.Object, _
     ByVal e As System.Windows.Forms.MouseEventArgs) _
     Handles MyBase.MouseMove
     If shouldPaint Then
        Dim graphic As Graphics = CreateGraphics()
        graphic.FillRectangle _
           (New SolidBrush(Color.BlueViolet), e.X, e.Y, 4, 4)
     End If
  End Sub
  Private Sub FrmPainter_MouseDown(ByVal sender As Object, _
     ByVal e As System.Windows.Forms.MouseEventArgs) _
     Handles MyBase.MouseDown
     shouldPaint = True
  End Sub 
  Private Sub FrmPainter_MouseUp(ByVal sender As Object, _
     ByVal e As System.Windows.Forms.MouseEventArgs) _
     Handles MyBase.MouseUp
     shouldPaint = False
  End Sub

End Class

      </source>