Mega Code Archive
Use Bitmap to buffer paint
<![CDATA[
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Math
Imports System.Drawing.Imaging
public class Bufferring
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles MyBase.Load
DrawDiamond()
End Sub
Private Sub Form1_Resize(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles MyBase.Resize
DrawDiamond()
End Sub
Private Sub DrawDiamond()
Dim wid As Integer = picCanvas.ClientSize.Width
Dim hgt As Integer = picCanvas.ClientSize.Height
If wid < 1 Or hgt < 1 Then Exit Sub
Dim bm As New Bitmap(wid, hgt)
Dim gr As Graphics = Graphics.FromImage(bm)
Dim bg_brush As New HatchBrush(HatchStyle.HorizontalBrick, Color.Blue, Color.Aqua)
gr.FillRectangle(bg_brush, picCanvas.ClientRectangle)
Dim pts() As Point = {New Point(wid \ 2, 0),New Point(wid, hgt \ 2), _
New Point(wid \ 2, hgt),New Point(0, hgt \ 2) }
gr.FillPolygon(Brushes.White, pts)
gr.DrawPolygon(Pens.Black, pts)
picCanvas.Image = bm
bg_brush.Dispose()
gr.Dispose()
End Sub
End Class
<Global.Microsoft.VisualBasic.CompilerServices.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.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.picCanvas = New System.Windows.Forms.PictureBox
CType(Me.picCanvas, System.ComponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
'
'picCanvas
'
Me.picCanvas.Dock = System.Windows.Forms.DockStyle.Fill
Me.picCanvas.Location = New System.Drawing.Point(0, 0)
Me.picCanvas.Name = "picCanvas"
Me.picCanvas.Size = New System.Drawing.Size(292, 273)
Me.picCanvas.TabIndex = 0
Me.picCanvas.TabStop = False
'
'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.Controls.Add(Me.picCanvas)
Me.Name = "Form1"
Me.Text = "AutoRedraw"
CType(Me.picCanvas, System.ComponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
End Sub
Friend WithEvents picCanvas As System.Windows.Forms.PictureBox
End Class
]]>