Form Refresh is faster than the Form Invalidate : Form Paint « GUI « VB.Net Tutorial






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.CompilerServices.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.ComponentModel.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








14.52.Form Paint
14.52.1.Set Form.ResizeRedrawSet Form.ResizeRedraw
14.52.2.Form InvalidateForm Invalidate
14.52.3.Form Refresh is faster than the Form InvalidateForm Refresh is faster than the Form Invalidate
14.52.4.Redraw when Form resizingRedraw when Form resizing