對於下雪的景象大家可能都不陌生,我們還是用VB來制作一個下雪的景象吧。其實制作這樣一個下雪的景象並不復雜,它的原理是首先在底色為黑色的屏幕上隨機畫出許多白點(雪花),然後使這些雪花不斷地向下移動(重畫),反復循環,就成功地模擬了下雪的景象。下面是這個小程序,你可以修改其中的一些數據調整雪花的密度和雪花落下的快慢。
雙擊窗體寫如下代碼:
Dim Snow(1000, 2), Amounty As Integer
Private Sub Form_Load()
Form1.Show
DoEvents
Randomize
Amounty = 325
For J = 1 To Amounty
Snow(J, 0) = Int(Rnd * Form1.Width)
Snow(J, 1) = Int(Rnd * Form1.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) > Form1.Height Then
Snow(I, 1) = 0: Snow(I, 2) = 5 + (Rnd * 30)
Snow(I, 0) = Int(Rnd * Form1.Width)
OldX = 0: OldY = 0
End If
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
編寫窗體的鼠標按下代碼:
Private Sub Form_MouseDown(Button As Integer,Shift As Integer, X As Single, Y As Single)
unload me
End Sub
運行上面的小程序,就可以看到漫天的雪花在緩緩落下,地面上還會有積雪!鼠標單擊可結