form1.vb

Visual.Basic.NET实用编程百例-47.6M.zip

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写 dispose 以清理组件列表。
    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

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer
    Friend WithEvents Timer1 As System.Windows.Forms.Timer
    Friend WithEvents Panel1 As System.Windows.Forms.Panel

    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem5 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem5 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.SuspendLayout()
        '
        'Panel1
        '
        Me.Panel1.Location = New System.Drawing.Point(16, 16)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(392, 240)
        Me.Panel1.TabIndex = 0
        '
        'Timer1
        '
        Me.Timer1.Interval = 200
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        '
        'MenuItem1
        '
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2, Me.MenuItem5, Me.MenuItem3})
        Me.MenuItem1.Text = "操作"
        '
        'MenuItem2
        '
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "百叶窗效果"
        '
        'MenuItem5
        '
        Me.MenuItem5.Index = 1
        Me.MenuItem5.Text = "-"
        '
        'MenuItem3
        '
        Me.MenuItem3.Index = 2
        Me.MenuItem3.Text = "退出"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(424, 293)
        Me.Controls.Add(Me.Panel1)
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "百叶窗效果"
        Me.ResumeLayout(False)

    End Sub
#End Region
    '记录Timer控件被激发的次数
    Dim times As Integer = 0
    '记录各线条产生的时间
    Dim h, w As Integer
    Dim img As Image
    Dim bmp1 As Bitmap
    Dim bmp2 As Bitmap
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Timer1.Enabled = True
        Me.FormBorderStyle = FormBorderStyle.Fixed3D
        Panel1.Dock = DockStyle.Fill
        Panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        h = Me.Height
        w = Me.Width
        '从硬盘上获取图片
        img = Image.FromFile("..\image.bmp")
        Dim backimage As Bitmap
        backimage = New Bitmap(img, w, h)
        Panel1.BackgroundImage = backimage
    End Sub
    Private Sub Panel1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel1.Paint
        Dim g As Graphics = e.Graphics
        Dim tc As Color = New Color
        '获取绘图环境
        bmp1 = New Bitmap(img, w, h)
        '创建一个与bmp1同样大小的空位图
        bmp2 = New Bitmap(w, h)

        Dim i, j, k As Integer
        For i = 0 To 10
            '表示分6次刷新
            '每次只画出整个图片的1/6
            For j = i To h - 1 Step 10
                For k = 0 To w - 1
                    '获取bmp1指定位置处像素的颜色
                    'k，j为横、纵坐标
                    tc = bmp1.GetPixel(k, j)
                    '在bmp2相同的位置绘制同样颜色的一个像素
                    bmp2.SetPixel(k, j, tc)
                Next
            Next
            '在Panel1上绘制bmp2
            g.DrawImage(bmp2, 0, 0)
            '延迟一定时间，再进行下一次刷新
            delay()
        Next
        bmp2 = New Bitmap(w, h)
    End Sub

    Private Sub delay()
        Dim i As Integer
        For i = 0 To 1000000
            If i < 1000000 Then

            End If
        Next
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Me.Panel1.Invalidate()
    End Sub

    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        Me.Panel1.BackgroundImage = Nothing
        Timer1.Interval = 2800
        Panel1.Dock = DockStyle.Fill
        Panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Panel1.Invalidate()
    End Sub

    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        End
    End Sub
End Class