vb.net实现小时钟的简单介绍

vb中怎样做出时钟?

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

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

For i = 1 To Val(Mid(Time$, 4, 2))

RotateLine Line2, Line2.X1, Line2.Y1, 1 * PI / 30

For i = 1 To Val(Mid(Time$, 1, 2)) * 5 '对时针

RotateLine Line1, Line1.X1, Line1.Y1, 1 * PI / 30

For i = 1 To Val(Mid(Time$, 4, 2)) '对时针

RotateLine Line1, Line1.X1, Line1.Y1, 1 * PI / 360

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

用VB.net做一个时间计时器

'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

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.

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.net开发简单的时钟程序？？高手救救我！

就

是

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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

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()

本文标题：vb.net实现小时钟的简单介绍
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vb.net实现小时钟的简单介绍

vb中怎样做出时钟?

用VB.net做一个时间计时器

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)

vb.net开发简单的时钟程序？？高手救救我！

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