C#编程指南：在PictureBox控件中实现图像旋转功能详解

以下是问题链接

C＃Image / PictureBox旋转 &＃8211; CodeProject

旋转PictureBox控件 &＃8211; CodeProject

我记得前一段时间曾经写过类似时钟的UserControl。 这是执行您请求的基本代码。

Private Sub Paint_Clock(ByVal sender As Object, _ ByVal e As System.Windows.Forms.PaintEventArgs) _ Handles Clock.Paint Dim _independentHands as Boolean = False Dim g As Graphics = e.Graphics Dim centrePoint As Point = New Point(Clock.Width  2, Clock.Height  2) Dim _time As New TimeSpan(5, 2, 15) 'pens' Dim hourPen As New Pen(Color.Black, 3) Dim minPen As New Pen(Color.Black, 2) Dim secPen As New Pen(Color.Red, 1) 'clock hand lengths' Dim halfClockWidth As Integer = Clock.Width  2 Dim hourLength As Integer = CInt(halfClockWidth * (4 / 6)) - 5 Dim minLength As Integer = CInt(halfClockWidth * (5 / 6)) - 5 Dim secLength As Integer = CInt(halfClockWidth * (5 / 6)) - 5 Dim secLength2 As Integer = CInt(halfClockWidth * (1 / 6)) 'angles' Dim secAngle As Single = CSng(_time.Seconds / 60) * 360 Dim secAngle2 As Single = secAngle - 180 Dim minAngle As Single = CSng(_time.Minutes / 60) * 360 Dim hrAngle As Single = CSng((_time.Hours - 12) / 12) * 360 If Not _independentHands Then minAngle += (secAngle / 60) If Not _independentHands Then hrAngle += (minAngle / 12) 'centre point' Dim pointPen As New Pen(Color.Black, 4) Dim pointRect As New Rectangle(centrePoint.X - 2, centrePoint.Y - 2, 4, 4) 'antialias on' g.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias 'draw the background' g.DrawImage(My.Resources.ClockBack, 0, 0, Clock.Width, Clock.Height) 'draw the hands' g.DrawLine(hourPen, centrePoint, GetPoint2(centrePoint, hrAngle, hourLength)) g.DrawLine(minPen, centrePoint, GetPoint2(centrePoint, minAngle, minLength)) g.DrawLine(secPen, centrePoint, GetPoint2(centrePoint, secAngle, secLength)) g.DrawLine(secPen, centrePoint, GetPoint2(centrePoint, secAngle2, secLength2)) 'draw the centre point' g.DrawEllipse(pointPen, pointRect) 'draw the glass' g.DrawImage(My.Resources.ClockGlass, 0, 0, Clock.Width, Clock.Height) End Sub Private Function GetPoint2(ByVal startPoint As Point, _ ByVal angle As Single, _ ByVal length As Integer) As Point Dim x, y As Integer Dim sp As Point = startPoint 'normalize' Do While angle - 360 > 0 angle -= 360 Loop Do While angle <0 angle += 360 Loop If angle = 360 Then angle = 0 Dim rad = angle * (Math.PI / 180) 'angle in radians' 'calc the new point' x = CInt(length * Math.Sin(rad)) y = CInt(length * Math.Cos(rad)) Return New Point(sp.X + x, sp.Y - y) End Function 

笔记
1.在表单（或usercontrol）中添加名为Clock的PictureBox
2.为时钟背景（时钟的面部）添加一个名为ClockBack的资源。
3.为时钟的玻璃面添加一个名为ClockGlass的资源。
4.在表单中删除上面的代码。
5.将计时器的间隔设置为1000并使其Tick事件Refresh或使时钟Invalidate [这是一个PictureBox]。

请注意，当设置为true时，变量_independentHands使时钟的指针彼此独立。
例如，当设置为False ，4：30将时针设置在4和5之间。当为True ，时针将在4到4:59:59之间，并且将在5:00'跳'到5 ：00。

我宁愿把它弄错，以给自然时钟感觉。

试试这个

pictureBox1.Image.RotateFlip（（RotateFlipType.Rotate90FlipX））;

或者每1000毫秒在一个线程中旋转它

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