如何在VB中使用时间动画来做下雪的界面，其中用的是什么原理？

给你个完整代码吧，我正在用的，不过看你没给分。呵呵

Dim Snow(1000, 2), Amounty As Integer

Private Sub Form_Load()
If App.PrevInstance Then
End
End If
xue.Show
DoEvents
Randomize: Amounty = 325
For J = 1 To Amounty
Snow(J, 0) = Int(Rnd * xue.Width)
Snow(J, 1) = Int(Rnd * xue.Height)
Snow(J, 2) = 10 + (Rnd * 20)
Next J

Do While Not (DoEvents = 0)
For LS = 1 To 10
For i = 1 To Amounty
OldX = Snow(i, 0): OldY = Snow(i, 1): Snow(i, 1) = Snow(i, 1) + Snow(i, 2)
If Snow(i, 1) > xue.Height Then Snow(i, 1) = 0: Snow(i, 2) = 5 + (Rnd * 30): Snow(i, 0) = Int(Rnd * xue.Width): OldX = 0: OldY = 0
Coloury = 8 * (Snow(i, 2) - 10): Coloury = 60 + Coloury: PSet (OldX, OldY), QBColor(0): PSet (Snow(i, 0), Snow(i, 1)), RGB(Coloury, Coloury, Coloury)
Next i
Next LS
Loop
End
End Sub
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
Me.Hide
End Sub
Private Su