form1.frm

Visual Basic程序设计基础》-杨小影-源代码

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3150
   ClientLeft      =   60
   ClientTop       =   390
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3150
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.Timer Timer1 
      Enabled         =   0   'False
      Interval        =   150
      Left            =   480
      Top             =   1560
   End
   Begin VB.Image Image1 
      Height          =   2640
      Left            =   1320
      Picture         =   "Form1.frx":0000
      Stretch         =   -1  'True
      Top             =   240
      Width           =   2625
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
 Dim IsPlaying As Boolean '动画是否启动
Dim Width0%, Height0% '气球原大小
Dim DetaX%, DetaY% '沿X、Y轴的缩放增量

Private Sub Form_Load()
IsPlaying = False
Image1.ToolTipText = "开始"
Width0% = Image1.Width '保存气球的初始大小
Height0% = Image1.Height
DetaX% = 100
DetaY% = 100

End Sub

Private Sub Image1_Click()
If IsPlaying Then
IsPlaying = False
Timer1.Enabled = IsPlaying
Image1.ToolTipText = "开始"
Else
IsPlaying = True
Timer1.Enabled = IsPlaying
Image1.ToolTipText = "停止"
End If

End Sub

Private Sub Timer1_Timer()
'移动Image对象，保持同心缩放
Image1.Move Image1.Left - DetaX% / 2, Image1.Top - DetaY% / 2
'按增量缩放
Image1.Width = Image1.Width + DetaX%
Image1.Height = Image1.Height + DetaY%

'碰到边界，则缩小
If Image1.Left + Image1.Width >= Form1.Width Or _
Image1.Top + Image1.Height >= Form1.Height Or _
Image1.Left <= 0 Or Image1.Top <= 0 Then
DetaX% = -DetaX%
DetaY% = -DetaY%
End If

'缩到原大，则膨胀
If Image1.Width <= Width0% Or Image1.Height <= Height0% Then
DetaX% = -DetaX%
DetaY% = -DetaY%
End If

End Sub