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 Panel1 As System.Windows.Forms.Panel
    Friend WithEvents Panel2 As System.Windows.Forms.Panel
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button

    '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 Button3 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button1 = New System.Windows.Forms.Button
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.Panel2 = New System.Windows.Forms.Panel
        Me.Button3 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(208, 128)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(100, 30)
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "旋转图片"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(208, 72)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(100, 30)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "镜像变换"
        '
        'Panel1
        '
        Me.Panel1.Location = New System.Drawing.Point(8, 40)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(200, 200)
        Me.Panel1.TabIndex = 0
        '
        'Panel2
        '
        Me.Panel2.Location = New System.Drawing.Point(312, 40)
        Me.Panel2.Name = "Panel2"
        Me.Panel2.Size = New System.Drawing.Size(200, 200)
        Me.Panel2.TabIndex = 0
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(208, 192)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(100, 30)
        Me.Button3.TabIndex = 2
        Me.Button3.Text = "关闭窗口"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(520, 277)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.Panel2)
        Me.Name = "Form1"
        Me.Text = "图片的旋转和镜像"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Dim pic1, pic2 As Bitmap
    '表示进行镜像还是进行旋转
    Dim mode As Integer = 0

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.FormBorderStyle = FormBorderStyle.Fixed3D
        Me.MaximizeBox = False
        '将两个Panel设成同样大小的正方形
        Panel1.Height = Panel1.Width
        Panel2.Width = Panel1.Width
        Panel2.Height = Panel2.Width
        Panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Panel2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D

        '将pic1和pic2设成与Panel控件等大的同一张图片
        Dim img As Image = Image.FromFile("..\image.bmp")
        pic1 = New Bitmap(img, Panel1.Width, Panel1.Height)
        pic2 = New Bitmap(pic1)
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        mode = 1
        Panel2.Invalidate()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        mode = 2
        Panel2.Invalidate()
    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
        g.DrawImage(pic1, 0, 0)
    End Sub

    Private Sub Panel2_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel2.Paint
        Dim g As Graphics = e.Graphics
        Dim a As Integer = Panel2.Width
        Dim tc As Color = New Color
        Select Case mode
            Case 1
                '镜像变换
                Dim mpic As Bitmap
                mpic = New Bitmap(a, a)
                Dim i, j As Integer
                For i = 0 To a - 1
                    For j = 0 To a - 1
                        tc = pic1.GetPixel(i, j)
                        mpic.SetPixel(a - i - 1, j, tc)
                    Next
                Next
                g.DrawImage(mpic, 0, 0)
                '保存变换的结果
                pic2 = New Bitmap(mpic)
            Case 2
                '旋转变换
                Dim rpic As Bitmap
                rpic = New Bitmap(a, a)
                Dim i, j As Integer
                For i = 0 To a - 1
                    For j = 0 To a - 1
                        tc = pic2.GetPixel(i, j)
                        rpic.SetPixel(a - j - 1, i, tc)
                    Next
                Next
                g.DrawImage(rpic, 0, 0)
                '保存变换的结果
                pic2 = New Bitmap(rpic)
        End Select
        mode = 0
    End Sub


    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        End
    End Sub
End Class