圆锥曲线.frm

一个vb程序

VERSION 5.00
Begin VB.Form Form1 
   BackColor       =   &H00FFC0FF&
   Caption         =   "打印各种曲线"
   ClientHeight    =   6555
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   7215
   Icon            =   "圆锥曲线.frx":0000
   LinkTopic       =   "Form1"
   ScaleHeight     =   6555
   ScaleWidth      =   7215
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command9 
      Caption         =   "余弦曲线"
      Height          =   375
      Left            =   5400
      TabIndex        =   10
      Top             =   5520
      Width           =   1455
   End
   Begin VB.CommandButton Command8 
      Caption         =   "正弦曲线"
      Height          =   375
      Left            =   3960
      TabIndex        =   9
      Top             =   6120
      Width           =   1335
   End
   Begin VB.CommandButton Command7 
      Caption         =   "三叶线"
      Height          =   375
      Left            =   3960
      TabIndex        =   8
      Top             =   5520
      Width           =   1215
   End
   Begin VB.CommandButton Command6 
      Caption         =   "心形线"
      Height          =   375
      Left            =   2520
      TabIndex        =   7
      Top             =   6120
      Width           =   1335
   End
   Begin VB.CommandButton Command5 
      Caption         =   "阿基米德螺线"
      Height          =   375
      Left            =   2520
      TabIndex        =   6
      Top             =   5520
      Width           =   1335
   End
   Begin VB.CommandButton Command4 
      Caption         =   "设置系数"
      Height          =   375
      Left            =   240
      TabIndex        =   4
      Top             =   5520
      Width           =   975
   End
   Begin VB.CommandButton Command3 
      Caption         =   "圆锥曲线"
      Height          =   375
      Left            =   1440
      TabIndex        =   3
      Top             =   6120
      Width           =   975
   End
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      Height          =   375
      Left            =   5400
      TabIndex        =   2
      Top             =   6120
      Width           =   1455
   End
   Begin VB.CommandButton Command1 
      Caption         =   "打印坐标"
      Height          =   375
      Left            =   1440
      TabIndex        =   1
      Top             =   5520
      Width           =   975
   End
   Begin VB.PictureBox Picture1 
      AutoRedraw      =   -1  'True
      BackColor       =   &H00C0FFC0&
      Height          =   5295
      Left            =   240
      ScaleHeight     =   5235
      ScaleWidth      =   6795
      TabIndex        =   0
      Top             =   120
      Width           =   6855
   End
   Begin VB.Label Label1 
      Caption         =   "Label1"
      Height          =   375
      Left            =   240
      TabIndex        =   5
      Top             =   6000
      Width           =   975
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim x, r, k
Const pi = 3.14159

Private Sub Command1_Click()
Picture1.DrawWidth = 1
Picture1.Line (0, Picture1.ScaleHeight / 2)-(Picture1.ScaleWidth, Picture1.ScaleHeight / 2)

Picture1.Line (Picture1.ScaleWidth / 2, 0)-(Picture1.ScaleWidth / 2, Picture1.ScaleHeight)
End Sub

Private Sub Command2_Click()
End
End Sub

Private Sub Command3_Click()
k = Label1.Caption
x = 0.5
cd:
r = 800 / (1 - Cos(2 * pi * x / 360) * k)
Picture1.DrawWidth = 3

Picture1.PSet (Picture1.ScaleWidth / 2 + r * Cos(2 * pi * x / 360), Picture1.ScaleHeight / 2 + r * Sin(2 * pi * x / 360)), 250
If x < 359.5 Then x = x + 1 / 3
If x > 359.5 Then Exit Sub
GoTo cd





End Sub

Private Sub Command4_Click()
response$ = InputBox("输入系数k", "k<1,椭圆;x=1,抛物线;k>1,双曲线", "")
k = Val(response$)
Label1.Caption = k


End Sub

Private Sub Command5_Click()
x = 0
k = Label1.Caption
cd:
r = x * k / 3
Picture1.DrawWidth = 3
Picture1.PSet (Picture1.ScaleWidth / 2 + r * Cos(2 * pi * x / 360), Picture1.ScaleHeight / 2 + r * Sin(2 * pi * x / 360)), 25000
If x < 2160 Then x = x + 1 / 3
If x >= 2160 Then Exit Sub
GoTo cd


End Sub

Private Sub Command6_Click()
x = 0
k = Label1.Caption
cd:
r = 1000 * (1 - Cos(k * pi * x / 360))
Picture1.DrawWidth = 3
Picture1.PSet (Picture1.ScaleWidth / 2 + r * Cos(2 * pi * x / 360), Picture1.ScaleHeight / 2 + r * Sin(2 * pi * x / 360)), 200
If x < 720 Then x = x + 1 / 3
If x > 720 Then Exit Sub
GoTo cd


End Sub

Private Sub Command7_Click()
x = 0
k = Label1.Caption
cd:
r = 2500 * (Cos(k * pi * x / 360))
Picture1.DrawWidth = 3
Picture1.PSet (Picture1.ScaleWidth / 2 + r * Cos(2 * pi * x / 360), Picture1.ScaleHeight / 2 + r * Sin(2 * pi * x / 360)), 350
If x < 720 Then x = x + 1 / 3
If x >= 720 Then Exit Sub
GoTo cd



End Sub

Private Sub Command8_Click()

Picture1.DrawWidth = 3
For x = -200 To 200 Step 0.1
Picture1.PSet (80 * x + Picture1.ScaleWidth / 2, -900 * Sin(x / pi) + Picture1.ScaleHeight / 2), 50000
Next x

End Sub

Private Sub Command9_Click()

Picture1.DrawWidth = 3
For x = -200 To 200 Step 0.1
Picture1.PSet (80 * x + Picture1.ScaleWidth / 2, -900 * Cos(x / pi) + Picture1.ScaleHeight / 2), 250
Next x

End Sub

Private Sub Form_Load()
Label1.Caption = ""


End Sub