VB可使用Timer控件、Line控件和绘图或加载图片等制作指针式时钟。
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Timer 控件，通过引发 Timer 事件，Timer 控件可以有规律地隔一段时间执行一次代码。
Line 控件，Line 控件是图形控件，它显示水平线、垂直线或者对角线。
运行时不能使用 Move 方法移动 Line 控件，但是可以通过改变 X1、X2、Y1 和 Y2
属性来移动它或者调整它的大小。
Circle 方法，在对象上画圆、椭圆或弧。
以下是通过加载图片的指针式时钟代码：
Option Explicit
Private Const PI = 3.1415926
Dim X(1) As Single, Y(1) As Single
Dim OriAngle As Single, DestAngle As Single, r As Single
Private Sub RotateLine(objL As Line, bsPointX As Single, bsPointY As Single, RotateAngle As Single)
With objL
X(0) = .X1
Y(0) = .Y1
X(1) = .X2
Y(1) = .Y2
End With
Dim i As Integer
For i = 0 To 1
If X(i) - bsPointX 0 Then
OriAngle = Atn((Y(i) - bsPointY) / (X(i) - bsPointX))
Else
OriAngle = IIf(Y(i) bsPointY, PI / 2, 1.5 * PI)
End If
If X(i) - bsPointX 0 Then
If OriAngle 0 Then
OriAngle = PI - Abs(OriAngle)
Else
OriAngle = PI + Abs(OriAngle)
End If
End If
DestAngle = OriAngle + RotateAngle
r = Sqr((X(i) - bsPointX) ^ 2 + (Y(i) - bsPointY) ^ 2)
X(i) = bsPointX + r * Cos(DestAngle)
Y(i) = bsPointY + r * Sin(DestAngle)
Next i
With objL
.X1 = X(0)
.Y1 = Y(0)
.X2 = X(1)
.Y2 = Y(1)
End With
End Sub
Private Sub Form_Load()
Timer1.Interval = 1000
Dim i As Long
For i = 1 To Val(Mid(Time$, 7, 2))
RotateLine Line3, Line3.X1, Line3.Y1, 1 * PI / 30
Next
For i = 1 To Val(Mid(Time$, 4, 2))
RotateLine Line2, Line2.X1, Line2.Y1, 1 * PI / 30
Next
For i = 1 To Val(Mid(Time$, 1, 2)) * 5 '对时针
RotateLine Line1, Line1.X1, Line1.Y1, 1 * PI / 30
Next
For i = 1 To Val(Mid(Time$, 4, 2)) '对时针
RotateLine Line1, Line1.X1, Line1.Y1, 1 * PI / 360
Next
End Sub
Private Sub Timer1_Timer()
RotateLine Line3, Line3.X1, Line3.Y1, 1 * PI / 30
RotateLine Line2, Line2.X1, Line2.Y1, PI / 1800
If Mid(Time$, 7, 2) = "00" Or Mid(Time$, 7, 2) = "30" Then
RotateLine Line1, Line1.X1, Line1.Y1, 1 * PI / 720
End If
Me.Caption = Time$
End Sub
'添加一个label标签名字label1 用来显示时间
'再添加一个timer控件 名字timer1 interval属性=1000 用来计时
'窗体添加代码
Dim t As Date '用来记录时间
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles Timer1.Tick
t = t.AddSeconds(1)
Label1.Text = "登录时间:" t.TimeOfDay.ToString
End Sub
你需要会用GDI+,也就是那个System.Drawing命名空间下的类.
给你说个思路,设Timer,到时间就用Form.Invalidate()函数重画窗口,在重画窗口的Form_Paint事件下面编写代码得到当前时间,再根据当前时间用GDI+画时钟.
就
是
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了
！
Hand类的代码：
Public MustInherit Class Hand
Protected gp As GraphicsPath = New GraphicsPath()
Protected gpBase As GraphicsPath = Nothing
Protected midX As Integer = 150 ‘默认的窗体
Protected midY As Integer = 150 ‘中心位置
‘构造器，得到窗体中心位置
Public Sub New(ByVal theForm As Form1)
midX = (theForm.ClientRectangle.Left + theForm.ClientRectangle.Right) / 2
midY = (theForm.ClientRectangle.Top + theForm.ClientRectangle.Bottom) / 2
End Sub
MustOverride Sub Transform(ByVal d As DateTime)
‘绘制指针路径
Overridable Sub Draw(ByVal g As Graphics)
Dim aPen As Pen = New Pen(Brushes.Black, 4F)
g.DrawPath(aPen, gp)
g.FillPath(Brushes.Black, gp)
aPen.Dispose()
End Sub
‘使用矩阵实现路径（gp）的旋转
Public Sub Rotate(ByVal angle As Double)
gp = CType(gpBase.Clone(), GraphicsPath)
Dim mTransform As Matrix = New Matrix()
mTransform.RotateAt(CType(angle,Single),NewPointF(midX,midY))
gp.Transform(mTransform)
End Sub
End Class
为了节省篇幅，上面的代码省略了引入命名空间的语句。
下面是分针（MinuteHand）类的定义：
Public Class MinuteHand
Inherits Hand
‘构造器，生成绘制分针的路径（gp）
Public Sub New(ByVal myForm As Form1)
MyBase.New(myForm)
gp.AddLine(midX, midY, midX, 45)
gp.AddLine(midX, 45, midX - 3, 50)
gp.AddLine(midX - 3, 50, midX + 3, 50)
gp.AddLine(midX + 3, 50, midX, 45)
gpBase = CType(gp.Clone(), GraphicsPath)
End Sub
‘Transform方法取得系统当前时间，并旋转时钟指针。
Public Overrides Sub Transform(ByVal d As DateTime)
Dim minuteTime As Double = (CDbl(d.Minute) + CDbl(d.Second / 60))
Dim angle As Double = (CDbl(minuteTime) / 60) * 360
Rotate(angle)
End Sub
End Class
对所有的指针旋转的方法都是相同的，因此在基类中实现。由于时针和秒针的实现与分针相似，所不同者，只在于构造器中绘制的指针路径不同和Transform方法中转动的角度不同，在这里就不在赘述了。
另外还需要提一下的是画时钟表面的代码，时钟表面用ClockFace类来实现。这个类首先画一个圆代表时钟，然后画上米老鼠的图案，最后在相应的位置画上数字1～12代表12个小时。
Public Sub Draw(ByVal g As Graphics)
DrawClockFace(g)
DrawImage(g)
DrawNumbers(g)
DrawPin(g)
End Sub
下面是ClockFace类的属性：
Private ClockRectangle As Rectangle
Private ClockFont As Font = New Font("Arial", 12)
Private midPoint As Point
Private ClockImage As Bitmap
Private Const IMAGEX As Integer = 50
Private Const IMAGEY As Integer = 50
DrawClockFace方法用来画时钟表面：
Private Sub DrawClockFace(ByVal g As Graphics)
g.FillEllipse(Brushes.White, ClockRectangle.Left + 10, ClockRectangle.Top + 10, ClockRectangle.Width - 20, ClockRectangle.Height - 20)
g.DrawEllipse(Pens.Black, ClockRectangle.Left + 10, ClockRectangle.Top + 10, ClockRectangle.Width - 20, ClockRectangle.Height - 20)
End Sub
然后用Graphics对象的DrawImage方法画出米老鼠的图片：
Private Sub DrawImage(ByVal g As Graphics)
Dim nWidth As Integer = ClockImage.Width
Dim nHeight As Integer = ClockImage.Height
Dim destRect As Rectangle = New Rectangle(midPoint.X - IMAGEX / 2, midPoint.Y - IMAGEY / 2, IMAGEX, IMAGEY)
g.DrawImage(ClockImage, destRect)
End Sub
数字在时钟上的位置是用sin和cos函数计算的：
Private Sub DrawNumbers(ByVal g As Graphics)
Dim count As Integer = 1
Dim a As Double
For a = 0 To 2 * Math.PI Step 2 * Math.PI / 12
Dim x As Double = (ClockRectangle.Width - 70) / 2 * Math.Cos(a - Math.PI / 3) + (ClockRectangle.Width - 70) / 2 + 25
Dim y As Double = (ClockRectangle.Width - 70) / 2 * Math.Sin(a - Math.PI / 3) + (ClockRectangle.Width - 70) / 2 + 20
g.DrawString(Convert.ToString(count), ClockFont, Brushes.Black, CType(x, Single), CType(y, Single), New StringFormat())
count += 1
Next
End Sub
最后是窗体文件（Form1.vb）:
Public Class Form1
Inherits System.Windows.Forms.Form
Private MyMinuteHand As MinuteHand
Private MyHourHand As HourHand
Private MySecondHand As SecondHand
Private TheClockFace As ClockFace
Private FirstTick As Boolean = False
‘在窗体的OnPaint事件中取得Graphics对象
Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
If (FirstTick = False) Then Exit Sub
Dim g As Graphics = e.Graphics
TheClockFace.Draw(g)
MyHourHand.Draw(g)
MyMinuteHand.Draw(g)
MySecondHand.Draw(g)
TheClockFace.DrawPin(g)
End Sub
‘计时器事件
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
MySecondHand.Transform(DateTime.Now)
MyHourHand.Transform(DateTime.Now)
MyMinuteHand.Transform(DateTime.Now)
FirstTick = True
Invalidate()
