用VB.net做一個(gè)時(shí)間計(jì)時(shí)器

'添加一個(gè)label標(biāo)簽名字label1 用來(lái)顯示時(shí)間

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'再添加一個(gè)timer控件 名字timer1 interval屬性=1000 用來(lái)計(jì)時(shí)

'窗體添加代碼

Dim t As Date '用來(lái)記錄時(shí)間

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As _

System.EventArgs) Handles Timer1.Tick

t = t.AddSeconds(1)

Label1.Text = "登錄時(shí)間:" t.TimeOfDay.ToString

End Sub

vb.net開(kāi)發(fā)簡(jiǎn)單的時(shí)鐘程序？？高手救救我！

就

是

這

個(gè)

了

！

Hand類的代碼：

Public MustInherit Class Hand

Protected gp As GraphicsPath = New GraphicsPath()

Protected gpBase As GraphicsPath = Nothing

Protected midX As Integer = 150 ‘默認(rèn)的窗體

Protected midY As Integer = 150 ‘中心位置

‘構(gòu)造器，得到窗體中心位置

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)

‘繪制指針路徑

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

‘使用矩陣實(shí)現(xiàn)路徑（gp）的旋轉(zhuǎn)

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

為了節(jié)省篇幅，上面的代碼省略了引入命名空間的語(yǔ)句。

下面是分針（MinuteHand）類的定義：

Public Class MinuteHand

Inherits Hand

‘構(gòu)造器，生成繪制分針的路徑（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方法取得系統(tǒng)當(dāng)前時(shí)間，并旋轉(zhuǎn)時(shí)鐘指針。

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

對(duì)所有的指針旋轉(zhuǎn)的方法都是相同的，因此在基類中實(shí)現(xiàn)。由于時(shí)針和秒針的實(shí)現(xiàn)與分針相似，所不同者，只在于構(gòu)造器中繪制的指針路徑不同和Transform方法中轉(zhuǎn)動(dòng)的角度不同，在這里就不在贅述了。

另外還需要提一下的是畫(huà)時(shí)鐘表面的代碼，時(shí)鐘表面用ClockFace類來(lái)實(shí)現(xiàn)。這個(gè)類首先畫(huà)一個(gè)圓代表時(shí)鐘，然后畫(huà)上米老鼠的圖案，最后在相應(yīng)的位置畫(huà)上數(shù)字1～12代表12個(gè)小時(shí)。

Public Sub Draw(ByVal g As Graphics)

DrawClockFace(g)

DrawImage(g)

DrawNumbers(g)

DrawPin(g)

End Sub

下面是ClockFace類的屬性：

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方法用來(lái)畫(huà)時(shí)鐘表面：

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對(duì)象的DrawImage方法畫(huà)出米老鼠的圖片：

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

數(shù)字在時(shí)鐘上的位置是用sin和cos函數(shù)計(jì)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

最后是窗體文件（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

‘在窗體的OnPaint事件中取得Graphics對(duì)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

‘計(jì)時(shí)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()

怎么在VB.net中實(shí)時(shí)顯示時(shí)間

定時(shí)器中處理

Private?Sub?Form1_Load(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?MyBase.Load

Timer1.Interval?=?10?'10毫秒刷新一次

Timer1.Start()?'開(kāi)啟定時(shí)器

End?Sub

Private?Sub?Timer1_Tick(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Timer1.Tick

Label1.Text?=?Now

End?Sub

vbnet中怎樣把時(shí)間設(shè)為24時(shí)制

將時(shí)間轉(zhuǎn)換為指定的字符串格式用：Now.ToString("yyyyMMddHHmmss")就Ok了。

例如：年份用小寫(xiě)yyyy(大寫(xiě)不識(shí)別)，大寫(xiě)MM識(shí)別為月份，小寫(xiě)mm識(shí)別為分鐘，日期天為大寫(xiě)DD(小寫(xiě)不識(shí)別)，

小時(shí)大寫(xiě)HH識(shí)別為24小時(shí)制，小寫(xiě)hh識(shí)別為12小時(shí)制，秒用小寫(xiě)ss(大寫(xiě)不識(shí)別)

補(bǔ)充：Visual Basic.NET是基于微軟.NET Framework之上的面向?qū)ο蟮木幊陶Z(yǔ)言。

其在調(diào)試時(shí)是以解釋型語(yǔ)言方式運(yùn)作,而輸出為EXE程序是是以編譯型語(yǔ)言方式運(yùn)作。

可以看作是Visual Basic在.Net Framework平臺(tái)上的升級(jí)版本，增強(qiáng)了對(duì)面向?qū)ο蟮闹С帧４蠖嗟腣B.Net程序員使用Visual Studio .Net作為IDE（integrated development environment).SharpDevelop是另一種可用的開(kāi)源的IDE。

VB.Net需要在.Net Framework平臺(tái)上才能執(zhí)行。