對于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并不復雜,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),然后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
|