怎样用vb.net作一个指针转动的钟表?(可设置时间日期,有闹铃功能)

你需要会用GDI+,也就是那个System.Drawing命名空间下的类.

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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.

VB用GDI使桌面时钟指针图片PNG旋转！

'秒、分、时

Dim Second, Minute, Hour As Integer

'表的中心位置

Dim X0, Y0 As Integer

'

Dim X, Y As Variant

Private Sub Form_MouseMove(Button As Integer, _

Shift As Integer, X As Single, Y As Single)

'按下鼠标左键

If Button = 1 Then

'鼠标指针在表盘内

If X X0 - 950 And X X0 + 950 Then

If Y Y0 - 950 And Y Y0 + 950 Then

'移动表的位置

X0 = X

Y0 = Y

End If

End If

End If

Form1.Refresh

End Sub

Sub Form_Load()

'设置表的中心位置

Let X0 = 1100

Let Y0 = 1100

'时刻与对应坐标的转换表

X = Array(0, 104, 207, 309, 406, 500, 587, _

669, 743, 809, 866, 913, 951, 978, 994, 1000, _

994, 978, 951, 913, 866, 809, 743, 669, 587, 500, 406, 309, 207, 104, 0, -105, -208, -310, -407, -500, -588, -670, -744, -810, -867, -914, -952, -979, -995, -1000, -995, -979, -952, -914, -867, -810, -744, -670, -588, -500, -407, -310, -208, -105, -1)

Y = Array(1000, 994, 978, 951, 913, 866, 809, 743, 669, 587, 500, 406, 309, 207, 104, 0, -105, -208, -310, -407, -500, -588, -670, -744, -810, -867, -914, -952, -979, -995, -1000, -995, -979, -952, -914, -867, -810, -744, -670, -588, -500, -407, -310, -208, -105, -1, 104, 207, 309, 406, 500, 587, 669, 743, 809, 866, 913, 951, 978, 994, 1000)

'初始化定时器

Timer1.Enabled = True

Timer1.Interval = 1

End Sub

Private Sub Timer1_Timer()

'绘制表盘

Circle (X0, Y0), 950, RGB(255, 255, 255)

'绘制刻度

DrawPlots

'定位时、分、秒针的起点

Line1.X1 = X0

Line1.Y1 = Y0

Line2.Y1 = Y0

Line2.X1 = X0

Line3.X1 = X0

Line3.Y1 = Y0

'秒

Second = Mid(Time, 7, 2)

'分

Minute = Mid(Time, 4, 2)

'时

Hour = Mid(Time, 1, 2)

If Hour 11 Then Hour = Hour - 12

Hour = Hour * 5 + (Hour / 12)

'定位时、分、秒针的终点

Line1.X2 = X(Second) * 0.9 + X0

Line1.Y2 = Y0 - Y(Second) * 0.9

Line2.X2 = X(Minute) * 0.8 + X0

Line2.Y2 = Y0 - Y(Minute) * 0.8

Line3.X2 = X(Hour) * 0.4 + X0

Line3.Y2 = Y0 - Y(Hour) * 0.4

End Sub

'绘制刻度

Sub DrawPlots()

For xx = 0 To 60

If (xx Mod 5) = 0 Then

Line (X(xx) + X0, Y(xx) + Y0)-(X(xx) * 1.1 + X0, Y(xx) * 1.1 + Y0), RGB(256, 256, 256)

End If

Next xx

End Sub 希望可以帮到你.!

vb.net GDI+

当然是全部重画。

层只不过是制图软件弄出来的一个方便的东西而已。

就像你画画，画上去如果你要擦掉当然是擦到底色咯。（当然GDI+也可以像你画画一样只擦一部分）

GDI+时钟我写过一个VB6的。代码详见我博客。地址显然百度不让贴上= =。所以你可以看下我的资料。

你可以模拟层，就是把所有绘制信息都保存起来。你的流程应当是：

如果要绘制了，更新绘制信息（可以是数组啥的。），交给一个Draw过程

Draw过程：根据绘制信息，全部绘制。

By vIstaswx ,before junior school graduation exam.

vb.net开发简单的时钟程序？？高手救救我！

就

是

这

个

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()

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