VB.Net Tutorial/GUI/Form Paint

Form Invalidate

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class FormRefresh
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private MouseX As Integer
    Private MouseY As Integer
    Dim rectangle1 As Rectangle = New Rectangle(15, 35, 80, 80)
    Private Sub Form1_MouseMove(ByVal sender As Object, _
          ByVal e As System.Windows.Forms.MouseEventArgs) _
          Handles Me.MouseMove
        MouseX = e.X
        MouseY = e.Y
        Me.Invalidate()
    End Sub
    Private Sub Form1_Paint(ByVal sender As Object, _
          ByVal e As System.Windows.Forms.PaintEventArgs) _
          Handles Me.Paint
          
          rectangle1.X = MouseX
          rectangle1.Y = MouseY
        Dim canvas As Graphics = e.Graphics  
        canvas.DrawRectangle(Pens.DarkRed, rectangle1)
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "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()
        Me.SuspendLayout()
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(469, 387)
        Me.Name = "Form1"
        Me.Text = "Redrawing by Invalidating"
        Me.ResumeLayout(False)
    End Sub
End Class

Form Refresh is faster than the Form Invalidate

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class FormRefresh
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private MouseX As Integer
    Private MouseY As Integer
    Dim rectangle1 As Rectangle = New Rectangle(15, 35, 80, 80)
    Private Sub Form1_MouseMove(ByVal sender As Object, _
          ByVal e As System.Windows.Forms.MouseEventArgs) _
          Handles Me.MouseMove
        MouseX = e.X
        MouseY = e.Y
        Me.Invalidate()
    End Sub
    Private Sub Form1_Paint(ByVal sender As Object, _
          ByVal e As System.Windows.Forms.PaintEventArgs) _
          Handles Me.Paint
          
          rectangle1.X = MouseX
          rectangle1.Y = MouseY
        Dim canvas As Graphics = e.Graphics  
        canvas.DrawRectangle(Pens.DarkRed, rectangle1)
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "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()
        Me.SuspendLayout()
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(469, 387)
        Me.Name = "Form1"
        Me.Text = "Redrawing by Invalidating"
        Me.ResumeLayout(False)
    End Sub
End Class

Redraw when Form resizing

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class ResizeRedraw
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub Form1_Paint(ByVal sender As Object, _
     ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        DrawGraphics(e.Graphics)
    End Sub
     
    Private Sub Form1_Resize(ByVal sender As Object, _
     ByVal e As System.EventArgs) Handles MyBase.Resize
        DrawGraphics(Me.CreateGraphics())
    End Sub
    Private Sub DrawGraphics(ByVal gr As Graphics)
        gr.Clear(Me.BackColor)
        gr.DrawRectangle(Pens.Black, 0, 0, _
            Me.ClientSize.Width - 1, _
            Me.ClientSize.Height - 1)
    End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "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()
        Me.SuspendLayout()
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Name = "Form1"
        Me.Text = "PaintResizeX"
        Me.ResumeLayout(False)
    End Sub
End Class

Set Form.ResizeRedraw

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class SetResizeRedrawPropertyOfForm
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles MyBase.Load
        Me.ResizeRedraw = True
        Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
    End Sub
    Private Sub Form1_Paint(ByVal sender As Object, _
     ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.Clear(Me.BackColor)
        e.Graphics.DrawRectangle(Pens.Black, 0, 0, _
            Me.ClientSize.Width - 1, _
            Me.ClientSize.Height - 1)
        e.Graphics.DrawLine(Pens.Black, 0, 0, _
            Me.ClientSize.Width - 1, _
            Me.ClientSize.Height - 1)
        e.Graphics.DrawLine(Pens.Black, _
            Me.ClientSize.Width - 1, 0, _
            0, Me.ClientSize.Height - 1)
    End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "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()
        Me.SuspendLayout()
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Name = "Form1"
        Me.Text = "UseResizeRedraw"
        Me.ResumeLayout(False)
    End Sub
End Class