form1.vb

Visual.Basic.NET实用编程百例-47.6M.zip

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Math
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 MainMenu1 As System.Windows.Forms.MainMenu
    '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 MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem5 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem10 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem4 As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.MenuItem4 = New System.Windows.Forms.MenuItem
        Me.MenuItem10 = New System.Windows.Forms.MenuItem
        Me.MenuItem5 = New System.Windows.Forms.MenuItem
        '
        '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.MenuItem3, Me.MenuItem4, Me.MenuItem10, Me.MenuItem5})
        Me.MenuItem1.Text = "操作"
        '
        'MenuItem2
        '
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "正弦函数"
        '
        'MenuItem3
        '
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "指数函数"
        '
        'MenuItem4
        '
        Me.MenuItem4.Index = 2
        Me.MenuItem4.Text = "特殊效果"
        '
        'MenuItem10
        '
        Me.MenuItem10.Index = 3
        Me.MenuItem10.Text = "-"
        '
        'MenuItem5
        '
        Me.MenuItem5.Index = 4
        Me.MenuItem5.Text = "退出"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackgroundImage = CType(resources.GetObject("$this.BackgroundImage"), System.Drawing.Image)
        Me.ClientSize = New System.Drawing.Size(408, 265)
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "使用Pen对象"

    End Sub

#End Region
    Dim flag As Integer
    Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
        '获取Graphics对象
        Dim pen1 As Pen
        Dim g As Graphics = e.Graphics
        '定义Pen对象
        pen1 = New Pen(Color.Black, 2)
        Select Case flag
            Case 1
                draw1(g, pen1) '画正弦函数曲线
            Case 2
                draw2(g, pen1) '画指数函数曲线
            Case 3
                draw3(g)       '画特殊效果曲线
        End Select

    End Sub
    Private Sub draw1(ByVal g As Graphics, ByVal pen1 As Pen)
        Dim i As Integer
        Dim x1, x2, y1, y2 As Integer
        g.DrawLine(pen1, 50, 150, 350, 150)
        g.DrawLine(pen1, 50, 250, 50, 60)
        g.DrawLine(pen1, 350, 150, 345, 145)
        g.DrawLine(pen1, 350, 150, 345, 155)
        g.DrawLine(pen1, 50, 60, 45, 65)
        g.DrawLine(pen1, 50, 60, 55, 65)
        '画坐标轴
        x1 = 50
        y1 = 150
        For i = 1 To 100
            x2 = 50 + i * 2
            y2 = 150 - Sin(3.1415926 / 50 * i) * 100
            g.DrawLine(pen1, x1, y1, x2, y2)
            x1 = x2
            y1 = y2
            If (i Mod 5 = 0) Then
                g.DrawLine(pen1, x1, y1, x1, 150)
            End If
        Next
        '画正弦函数曲线
    End Sub
    Private Sub draw2(ByVal g As Graphics, ByVal pen1 As Pen)
        Dim i As Integer
        Dim x1, x2, y1, y2 As Integer
        g.DrawLine(pen1, 50, 250, 350, 250)
        g.DrawLine(pen1, 200, 250, 200, 60)
        g.DrawLine(pen1, 350, 250, 345, 245)
        g.DrawLine(pen1, 350, 250, 345, 255)
        g.DrawLine(pen1, 200, 60, 195, 65)
        g.DrawLine(pen1, 200, 60, 205, 65)
        '画坐标轴
        x1 = 80
        y1 = 250 - Exp(-2) * 200 / (Exp(2))
        For i = 1 To 120
            x2 = 80 + i * 2
            y2 = 250 - Exp(-2 + i * 0.03) * 200 / (Exp(2))
            g.DrawLine(pen1, x1, y1, x2, y2)
            If i Mod 3 = 0 Then
                g.DrawLine(pen1, x1, y1, x1, 250)
            End If
            x1 = x2
            y1 = y2
        Next
        '画指数函数曲线
    End Sub

    Private Sub draw3(ByVal g As Graphics)
        '创建一个蓝色半透明的画笔
        '宽度为15
        Dim pen1 As Pen = New Pen(Color.FromArgb(150, Color.Blue), 15)
        '设置线型为虚线
        pen1.DashStyle = DashStyle.Dash
        '设置线头和线尾风格
        pen1.StartCap = LineCap.ArrowAnchor
        pen1.EndCap = LineCap.RoundAnchor
        'DrawCurve()函数绘制一条曲线
        '第二个参数为一个Point数组，用于确定曲线位置
        g.DrawCurve(pen1, New Point() {New Point(295, 30), New Point(380, 200), New Point(350, 220), New Point(70, 40), New Point(30, 70), New Point(160, 140)})

        '创建一个纹理刷子
        Dim tImage As Image
        tImage = New Bitmap("..\pen.BMP")
        Dim tBrush As Brush
        tBrush = New TextureBrush(tImage)
        '也可以用刷子创建一个画笔
        Dim pen2 As Pen = New Pen(tBrush, 20)
        '设置线型为双点划线
        pen2.DashStyle = DashStyle.DashDotDot
        '设置线头和线尾风格
        pen2.StartCap = LineCap.Triangle
        pen2.EndCap = LineCap.Round
        '画一条直线
        g.DrawLine(pen2, 20, 250, 400, 50)
    End Sub
    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        flag = 1
        Me.Invalidate()

    End Sub

    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        flag = 2
        Me.Invalidate()

    End Sub

    Private Sub MenuItem4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem4.Click
        flag = 3
        Me.Invalidate()
    End Sub


    Private Sub MenuItem5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem5.Click
        End
    End Sub
End Class