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'/////////////////////////////////
'小闹钟示例
'Written By griefforyou
'在窗体中添加一个Timer控件，将Interval设为1000以下。
'////////////////////////////////

Option Explicit

Const PI = 3.1415926
Dim BaseX As Integer, BaseY As Integer, R As Integer
Dim r1 As Integer, r2 As Integer, r3 As Integer

Private Sub Form_Load()
Me.ScaleMode = 3
Me.AutoRedraw = True

If Me.Width < 3000 Then Me.Width = 3000
If Me.Height < 3000 Then Me.Height = 3000

End Sub

Private Sub Init()
Dim i As Integer

BaseX = Me.ScaleWidth / 2
BaseY = Me.ScaleHeight / 2

R = IIf(BaseX > BaseY, BaseY * 0.8, BaseY * 0.8)
r1 = R * 0.2
r2 = R * 0.1
r3 = R * 0.05

For i = 0 To 360 Step 6

If i Mod 30 = 0 Then'时
Me.DrawWidth = 2
DrawLine BaseX (R - 3) * Sin(i * PI / 180), BaseY - (R - 3) * Cos(i * PI / 180), BaseX (R - 8) * Sin(i * PI / 180), BaseY - (R - 8) * Cos(i * PI / 180), 3
Else'分
Me.DrawWidth = 2
Me.PSet (BaseX (R - 3) * Sin(i * PI / 180), BaseY - (R - 3) * Cos(i * PI / 180))
End If
Next

Me.DrawWidth = 1
Me.Circle (BaseX, BaseY), R
End Sub

'绘制指针
Private Sub DrawClock()
Dim Second As Integer
Dim Minute As Integer
Dim Hours As Integer

Second = DatePart("s", Time)
Minute = DatePart("n", Time)
Hours = DatePart("h", Time)
If Hours > 12 Then
Hours = Hours - 12
End If

Me.DrawWidth = 1
Me.Circle (BaseX, BaseY), 4

DrawLine BaseX - r1 * Sin(Second * PI / 30), BaseY r1 * Cos(Second * PI / 30), BaseX (R - 10) * Sin(Second * PI / 30), BaseY - (R - 10) * Cos(Second * PI / 30), 0
DrawLine BaseX - r2 * Sin(Minute * PI / 30), BaseY r2 * Cos(Minute * PI / 30), BaseX R * 0.8 * Sin(Minute * PI / 30), BaseY - R * 0.8 * Cos(Minute * PI / 30), 1
DrawLine BaseX - r3 * Sin((Hours Minute / 60) * PI / 6), BaseY r3 * Cos((Hours Minute / 60) * PI / 6), BaseX R * 0.6 * Sin((Hours Minute / 60) * PI / 6), BaseY - R * 0.6 * Cos((Hours Minute / 60) * PI / 6), 2
End Sub

'画线函数
Private Sub DrawLine(x1 As Integer, y1 As Integer, x2 As Integer, y2 As Integer, Flag As Integer)
Static OldSX1 As Integer, OldSX2 As Integer, OldSY1 As Integer, OldSY2 As Integer
Static OldMX1 As Integer, OldMX2 As Integer, OldMY1 As Integer, OldMY2 As Integer
Static OldHX1 As Integer, OldHX2 As Integer, OldHY1 As Integer, OldHY2 As Integer
Select Case Flag
Case 0
Me.DrawWidth = 1
Me.Line (OldSX1, OldSY1)-(OldSX2, OldSY2), Me.BackColor
Me.Line (x1, y1)-(x2, y2)
OldSX1 = x1
OldSX2 = x2
OldSY1 = y1
OldSY2 = y2
Case 1
Me.DrawWidth = 2
Me.Line (OldMX1, OldMY1)-(OldMX2, OldMY2), Me.BackColor
Me.Line (x1, y1)-(x2, y2)
OldMX1 = x1
OldMX2 = x2
OldMY1 = y1
OldMY2 = y2
Case 2
Me.DrawWidth = 3
Me.Line (OldHX1, OldHY1)-(OldHX2, OldHY2), Me.BackColor
Me.Line (x1, y1)-(x2, y2)
OldHX1 = x1
OldHX2 = x2
OldHY1 = y1
OldHY2 = y2
Case Else
Me.Line (x1, y1)-(x2, y2)
End Select
End Sub

Private Sub Form_Resize()
Me.Cls
Call Init
End Sub

Private Sub Timer1_Timer()
Call DrawClock
End Sub