Private Sub Form_Click()
Picture1.ScaleMode = 3
Picture1.Scale (-3, 3)-(3, -3)
Picture1.Line (-0.3, -2)-(0.3, -3), , BF
End Sub
Private Sub Timer1_Timer()
Dim i As Single
Picture1.DrawWidth = 2
For i = 0.15 To 3 Step 0.001
Picture1.PSet (i, Log(i)), RGB(255, 0, 1)
Next
For i = 0.15 To 3 Step 0.001
Picture1.PSet (i, Log(i)), Form1.BackColor
Next
For i = -0.15 To -3 Step -0.001
Picture1.PSet (i, Log(-i)), RGB(255, 0, 1)
Next
For i = -0.15 To -3 Step -0.001
Picture1.PSet (i, Log(-i)), Form1.BackColor
Next
For i = -2 To 3 Step 0.001
Picture1.PSet (0, i), RGB(255, 0, 0)
Next i
For i = -2 To 3 Step 0.001
Picture1.PSet (0, i), Form1.BackColor
Next i
End Sub
用记事本生成以下四个文件，再到VB中新建一个工程，加入这4个文件，就可以看到礼花绽放效果。CExplosion.cls文件内容：
''''''''''''''''''''''''''''''''氏银''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "CExplosion"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
' CExplosion - Basically a collection of CFrags.
Option Explicit
Private m_Col As Collection
Private m_hDC As Long
' X and Y are the start position.
' How many frags do you want?
Public Sub Setup(x As Single, y As Single, FragCount As Integer, Gravity As Single, hDC As Long)
Dim i As Integer
Dim frag As CFrag
Dim Direction As Single, vel As Single
Set m_Col = New Collection
For i = 1 To FragCount
Set frag = New CFrag
Direction = Rnd * (2 * pi)
vel = (Rnd * 20) + 10
frag.Init x, y, Direction, vel, Gravity
m_Col.Add frag
Next i
m_hDC = hDC
End Sub
' Move and draw the frags.
Public Function Move() As Boolean
Dim frag As CFrag
Dim DeadCount As Integer
For Each frag In m_Col
With frag
If Not .Move Then DeadCount = DeadCount + 1
Ellipse m_hDC, .x - 2, .y - 2, .x + 1, .y + 1
End With
Next frag
Move = Not (DeadCount = m_Col.Count)
End Function
CFrag.cls文件内容：
''''''''''''''''''''''''''''''''''歼激宴''''''''''''''''''''''''''''''''''''''''''''''''''''''铅陪''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "CFrag"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
' CFrag - Represents a flying object with velocity and direction.
' From this it can work out a path of co-ordinates.
' Basic trigonometry is used.
Option Explicit
Private m_Direction As Single ' In Radians.
Private m_Velocity As Single
Private m_Gravity As Single ' Make it fall towards bottom of screen.
Private m_X As Single, m_Y As Single
' Setup the object.
Public Sub Init(XStart As Single, YStart As Single, Direction As Single, Velocity As Single, Gravity As Single)
m_Direction = Direction
m_Velocity = Velocity
m_Gravity = Gravity
m_X = XStart
m_Y = YStart
End Sub
' Move the object along its path.
Public Function Move() As Boolean
m_Velocity = m_Velocity - 1 ' Decrease speed.
If m_Velocity >0 Then
m_X = m_X + (m_Velocity * Cos(m_Direction))
m_Y = m_Y + (m_Velocity * Sin(m_Direction)) + m_Gravity
Move = True
' Else it has stopped.
End If
End Function
Public Property Get x() As Single
x = m_X
End Property
Public Property Get y() As Single
y = m_Y
End Property
CTrail.cls文件内容：
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "CTrail"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
' CTrail - Display a trail of dots for a set length.
Option Explicit
Private m_Direction As Single
Private m_Length As Integer
Private m_hDC As Long
Private m_X As Single, m_Y As Single
Public Sub Init(x As Single, y As Single, Direction As Single, Length As Integer, hDC As Long)
m_X = x
m_Y = y
m_Direction = Direction
m_Length = Length
m_hDC = hDC
End Sub
Public Function Move() As Boolean
If m_Length >0 Then
m_Length = m_Length - 1
m_X = m_X + 10 * Cos(m_Direction)
m_Y = m_Y + 10 * Sin(m_Direction)
Sparkle m_X, m_Y
Move = True
Else
Move = False
End If
End Function
' Draw a random splatter of dots about x,y.
Private Sub Sparkle(x As Single, y As Single)
Dim i As Byte
Dim nX As Single, nY As Single
Dim angle As Single
For i = 1 To (Rnd * 5) + 3
angle = Rnd * (2 * pi)
nX = x + (3 * Cos(angle))
nY = y + (3 * Sin(angle))
Ellipse m_hDC, nX - 1, nY - 1, nX + 1, nY + 1
Next i
End Sub
Public Property Get x() As Single
x = m_X
End Property
Public Property Get y() As Single
y = m_Y
End Property
frmExplode.frm文件内容：
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
VERSION 5.00
Begin VB.Form frmExplode
Caption = "Form1"
ClientHeight= 3195
ClientLeft = 60
ClientTop = 345
ClientWidth = 4680
FillStyle = 0 'Solid
LinkTopic = "Form1"
ScaleHeight = 213
ScaleMode = 3 'Pixel
ScaleWidth = 312
StartUpPosition = 3 'Windows Default
WindowState = 2 'Maximized
Begin VB.CommandButton cmdExit
Caption = "E&xit"
Height = 375
Left= 3000
TabIndex= 2
Top = 2520
Width = 1215
End
Begin VB.CommandButton cmdClear
Caption = "&Clear"
Height = 375
Left= 1680
TabIndex= 1
Top = 2520
Width = 1215
End
Begin VB.PictureBox Picture1
BackColor = &H00000000&
FillStyle = 0 'Solid
Height = 2295
Left= 120
ScaleHeight = 149
ScaleMode = 3 'Pixel
ScaleWidth = 301
TabIndex= 0
Top = 120
Width = 4575
End
Begin VB.Timer tmrMove
Enabled = 0 'False
Interval= 10
Left= 4080
Top = 120
End
End
Attribute VB_Name = "frmExplode"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
' Explosion - Simulate fireworks on your PC. Just click on the black box!
Option Explicit
Private explosion As CExplosion
Private trail As CTrail
Private bExplode As Boolean
Private Sub cmdClear_Click()
Picture1.Cls
End Sub
Private Sub cmdExit_Click()
Unload Me
End Sub
Private Sub Form_Resize()
' Keep everything looking good.
Dim h As Single
On Error Resume Next
h = ScaleHeight - cmdClear.Height
Picture1.Move 0, 0, ScaleWidth, h
cmdClear.Move 0, h
cmdExit.Move 0 + cmdClear.Width, h
End Sub
Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
If Not tmrMove.Enabled Then
' Create a new trail...
' Choose a color from a list.
Picture1.ForeColor = Choose(Int(Rnd * 5) + 1, vbRed, vbWhite, vbCyan, vbGreen, vbYellow)
Picture1.FillColor = Me.ForeColor
Set trail = New CTrail
' Choose random direction from 255 to 344
trail.Init x, y, Radians(Int(Rnd * 90) + 225), Int(Rnd * 30) + 20, Picture1.hDC
tmrMove.Enabled = True ' Timer will handle drawing.
End If
End Sub
Private Sub tmrMove_Timer()
' Note that the move functions also draw.
' They return false when the object no longer is moving.
If trail.Move = False And bExplode = False Then
' The trail has stopped so explode.
bExplode = True
Set explosion = New CExplosion
explosion.Setup trail.x, trail.y, Int(Rnd * 30) + 10, 9, Picture1.hDC
End If
If bExplode Then
If explosion.Move = False Then
' Reset for a new explosion!
tmrMove.Enabled = False
bExplode = False
End If
End If
End Sub
' Simple function to convert degrees to radians.
Private Function Radians(sngDegrees As Single) As Single
Radians = sngDegrees * pi / 180
End Function
modStuff.bas文件内容：
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Attribute VB_Name = "modStuff"
Option Explicit
' To get Pi type "? 4 * Atn(1)" in the immediate window,
' copy the result into code!
Public Const pi = 3.14159265358979
Public Declare Function Ellipse Lib "gdi32" (ByVal hDC As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
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