form1.vb

Source code for VB.NET book - Chapter 4

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

    '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 PictureBox1 As System.Windows.Forms.PictureBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents Button4 As System.Windows.Forms.Button
    Friend WithEvents Button5 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button3 = New System.Windows.Forms.Button
        Me.Button4 = New System.Windows.Forms.Button
        Me.Button5 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'PictureBox1
        '
        Me.PictureBox1.BackColor = System.Drawing.SystemColors.Window
        Me.PictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.PictureBox1.Dock = System.Windows.Forms.DockStyle.Top
        Me.PictureBox1.Location = New System.Drawing.Point(0, 0)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(488, 352)
        Me.PictureBox1.TabIndex = 0
        Me.PictureBox1.TabStop = False
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(8, 376)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(80, 24)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "四瓣花"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(104, 376)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(80, 24)
        Me.Button2.TabIndex = 2
        Me.Button2.Text = "变形四瓣花"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(208, 376)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(72, 24)
        Me.Button3.TabIndex = 3
        Me.Button3.Text = "摩尔图案"
        '
        'Button4
        '
        Me.Button4.Location = New System.Drawing.Point(304, 376)
        Me.Button4.Name = "Button4"
        Me.Button4.Size = New System.Drawing.Size(72, 24)
        Me.Button4.TabIndex = 4
        Me.Button4.Text = "六瓣花"
        '
        'Button5
        '
        Me.Button5.Location = New System.Drawing.Point(408, 376)
        Me.Button5.Name = "Button5"
        Me.Button5.Size = New System.Drawing.Size(64, 24)
        Me.Button5.TabIndex = 5
        Me.Button5.Text = "钻石图案"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(488, 430)
        Me.Controls.Add(Me.Button5)
        Me.Controls.Add(Me.Button4)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.PictureBox1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region
    Dim pen1 As New System.Drawing.Pen(Color.Green, 1)
    Dim g As System.Drawing.Graphics
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        g = PictureBox1.CreateGraphics
        PictureBox1.Refresh()
        Dim x1, x2, y1, y2, r As Long
        Dim x As Single
        Dim y As Double
        Const pi = 3.1415926
        r = 60
        For x = 0 To 2 * pi Step pi / 360
            y = r * (1 + Math.Sin(4 * x))
            x1 = 200 + Int(y * Math.Cos(x))
            y1 = 180 + Int(y * Math.Sin(x))
            x2 = 200 + Int(y * Math.Cos(x + pi / 5))
            y2 = 180 + Int(y * Math.Sin(x + pi / 5))
            g.DrawLine(pen1, x1, y1, x2, y2)
        Next
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        g = PictureBox1.CreateGraphics
        PictureBox1.Refresh()
        Dim x1, x2, y1, y2, r As Long
        Dim x As Single
        Dim y, z As Double
        Const pi = 3.1415926
        r = 60
        For x = 0 To 2 * pi Step pi / 360
            y = r * (1 + 1 / 4 * Math.Cos(20 * x))
            z = y * (1 + Math.Sin(4 * x))
            x1 = 200 + Int(z * Math.Cos(x))
            y1 = 180 + Int(z * Math.Sin(x))
            x2 = 200 + Int(z * Math.Cos(x + pi / 5))
            y2 = 180 + Int(z * Math.Sin(x + pi / 5))
            g.DrawLine(pen1, x1, y1, x2, y2)
        Next
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        g = PictureBox1.CreateGraphics
        PictureBox1.Refresh()
        Dim x1, x2, y1, y2, r As Long
        r = 60
        Const pi = 3.1415926
        Dim x As Single
        Dim y As Double
        For x = 0 To 4 * pi Step pi / 120
            y = r * (1 + 1 / 2 * Math.Cos(2.5 * x))
            x1 = 200 + y * Math.Cos(x)
            y1 = 180 - y * Math.Sin(x)
            x2 = 200 + y * Math.Cos(x + pi / 6)
            y2 = 180 - y * Math.Sin(x + pi / 6)
            g.DrawLine(pen1, x1, y1, x2, y2)
        Next
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        g = PictureBox1.CreateGraphics
        PictureBox1.Refresh()
        Dim x1, x2, y1, y2, r As Long
        r = 60
        Const pi = 3.1415926
        Dim x As Single
        Dim y, z As Double
        For x = 0 To 4 * pi Step pi / 360
            y = r * (1 + 1 / 4 * Math.Cos(2.5 * x))
            z = y * (1 + Math.Sin(6 * x))
            x1 = 200 + z * Math.Cos(x)
            y1 = 180 - z * Math.Sin(x)
            x2 = 200 + z * Math.Cos(x + pi / 6)
            y2 = 180 - z * Math.Sin(x + pi / 6)
            g.DrawLine(pen1, x1, y1, x2, y2)
        Next
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        g = PictureBox1.CreateGraphics
        PictureBox1.Refresh()
        Dim x(60), y(60) As Single
        Dim i, j, k As Short
        Dim theta As Single
        Dim t As Single = 100
        Const pi = 3.1415926
        k = 15
        theta = 2 * pi / k
        For i = 0 To k
            x(i) = t * Math.Cos(theta * (i + 1)) + 200
            y(i) = 200 - t * Math.Sin(theta * (i + 1))
        Next
        For i = 0 To k - 1
            For j = i + 1 To k
                g.DrawLine(pen1, Int(x(i)), Int(y(i)), Int(x(j)), Int(y(j)))
            Next
        Next
    End Sub
End Class