vb.net GDI绘图刷新问题

绘图代码写在Paint事件中，如

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Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint

Dim g As Graphics = Me.CreateGraphics

g.DrawLine(Pens.Red, 100, 100, 200, 100)

End Sub

'方法二：在 PictureBox1上显示图像----图画在Bitmap

PictureBox1.Image = Nothing

Dim wid As Integer = PictureBox1.ClientSize.Width

Dim hgt As Integer = PictureBox1.ClientSize.Height

Dim bm As New Bitmap(wid, hgt)

Dim g As Graphics = Graphics.FromImage(bm)

'画图代码

'画图代码

PictureBox1.Image = bm

PictureBox1.Refresh()

g.Dispose()

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.!

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.