winform中实现图片左旋,右旋

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左旋

继续旋转

右旋：

继续右旋

效果展示结束：

下面讲讲利用什么来实现的：

由于不光判断是否是图片的*.BMP;*.JPG;*.GIF;*.TIF;*.PNG 还有*.PDF文件，因此写了个自定义控件里面处理左旋，右旋，背景颜色，之类的。这里不来实现PDF

ImageList.cs里面的处理：

private List<PreviewControl> poPreviews = null;public ImageList(){InitializeComponent();poPreviews = new List<PreviewControl>();}/// <summary>/// 取得选择的图片/// </summary>/// <returns></returns>private PreviewControl GetCurrentPreview(){for (int i = 0; i < poPreviews.Count; i++){if (poPreviews[i].Selected){return poPreviews[i];}}return null;}/// <summary>/// 左旋/// </summary>/// <param name="eventSender"></param>/// <param name="eventArgs"></param>public void cmdLeftRoteImage_Click(System.Object eventSender, System.EventArgs eventArgs){PreviewControl oCurrent = GetCurrentPreview();if (oCurrent != null){oCurrent.RotateLeft();}}/// <summary>/// 右旋/// </summary>/// <param name="eventSender"></param>/// <param name="eventArgs"></param>public void cmdRightRoteImage_Click(System.Object eventSender, System.EventArgs eventArgs){PreviewControl oCurrent = GetCurrentPreview();if (oCurrent != null){oCurrent.RotateRight();}}

PreviewControll.cs 的代码：自定义控件上面拖放PictureBox 和WebBrowser

 [DllImport("user32.dll")]        extern static short GetKeyState(int vKey);        /// <summary>        /// 加载图片        /// </summary>        private string psImageLocation = String.Empty;        /// <summary>/// 左旋，右旋后直接保存        /// false:不保存、  true:保存        /// </summary>        private bool pbRotateSaveFlg = true;        /// <summary>        /// PDF文件类型的标志        /// TRUE:PDF文件　　FALSE:不是PDF文件        /// </summary>        private bool pbPdfFlg = false;        /// <summary>        /// 选择时的颜色        /// </summary>        private Color poSelectColor = SystemColors.Highlight;        /// <summary>        /// 未选择的颜色        /// </summary>        private Color poUnSelectColor = SystemColors.Control;        /// <summary>        /// 图片左旋右旋的值        /// </summary>        private int piRoteSum = 0;        /// <summary>        /// 图片预览控件初始化        /// </summary>        public PreviewControl()        {            InitializeComponent();                              }        private bool IsControlKeyDown()        {            return (GetKeyState(0x0011) & 0x0000FF00) != 0;        }        private bool IsShiftKeyDown()        {            return (GetKeyState(0x0010) & 0x0000FF00) != 0;        }        /// <summary>        /// 加载的图片        /// </summary>        public string ImageLocation        {            set            {                psImageLocation = value;                if (psImageLocation.Length == 0)                {                    pictureBox1.Visible = false;                    webBrowser1.Visible = false;                }                else if (value.EndsWith(".pdf", StringComparison.CurrentCultureIgnoreCase))                {                    webBrowser1.Visible = true;                    webBrowser1.Navigate(value);                    pictureBox2.Tag = value;                    pictureBox2.Visible = true;                    pictureBox1.Visible = false;                    pbPdfFlg = true;                }                else                {                    webBrowser1.Visible = false;                    pictureBox1.Visible = true;                    pictureBox1.ImageLocation = value;                }            }            get            {                return psImageLocation;            }        }        /// <summary>        /// 选择时的颜色        /// </summary>        public Color SelectColor        {            get            {                return poSelectColor;            }            set            {                poSelectColor = value;            }        }        /// <summary>        /// 没有选择的颜色        /// </summary>        public Color UnSelectColor        {            get            {                return poUnSelectColor;            }            set            {                poUnSelectColor = value;            }        }        /// <summary>        /// 图片旋转的值入 90 180 270 度        /// </summary>        public int RotateSum        {            get            {                return piRoteSum;            }            set            {                piRoteSum = value;            }        }        /// <summary>        /// 保存旋转后位置的状态        /// </summary>        public bool RotateSaveFlg        {            set            {                pbRotateSaveFlg = value;            }        }        /// <summary>        /// 左旋        /// </summary>        public void RotateLeft()        {            if (pictureBox1.Image != null)            {                //扩展名判断                if (CheckFileExtension(this.Tag.ToString()) == GFBEFUNC.FileExtension.PDF)                {                    return;                }                Image oSrc = pictureBox1.Image;                Bitmap oDst = new Bitmap(oSrc);                oDst.RotateFlip(RotateFlipType.Rotate270FlipNone);                pictureBox1.Image = oDst;                piRoteSum = piRoteSum + 270;                if (!pbRotateSaveFlg)                {                    return;                }                ImageSave((Bitmap)pictureBox1.Image, 100, pictureBox1.ImageLocation,0,0);            }        }        /// <summary>        /// 右旋        /// </summary>        public void RotateRight()        {            if (pictureBox1.Image != null)            {//扩展名判断                if (CheckFileExtension(this.Tag.ToString()) == GFBEFUNC.FileExtension.PDF)                {                    return;                }                Image oSrc = pictureBox1.Image;                Bitmap oDst = new Bitmap(oSrc);                oDst.RotateFlip(RotateFlipType.Rotate90FlipNone);                pictureBox1.Image = oDst;                piRoteSum = piRoteSum + 90;                if (!pbRotateSaveFlg)                {                    return;                }                ImageSave((Bitmap)pictureBox1.Image, 100, pictureBox1.ImageLocation,0,0);            }        }        /// <summary>        /// 清除图片的记忆位置        /// </summary>        public void ClearImageMemory()        {            if (pictureBox1.Image != null)            {                pictureBox1.Image.Dispose();            }            if (pictureBox2.Image != null)            {                pictureBox2.Image.Dispose();            }            if (!webBrowser1.IsDisposed)            {                webBrowser1.Dispose();            }        }        /// <summary>        /// 利用GC回收释放内存        /// </summary>        public void GCCollect()        {            pictureBox1.Image = null;            pictureBox2.Image = null;            webBrowser1 = null;        }

  /// <summary> /// 保存图片  /// <param name="src">图片地址</param>  /// <param name="scale">比例</param>  /// <param name="asSaveFile"></param>  /// <param name="aiWidth">宽度</param>  /// <param name="aiHeight">高度</param>  public static void ImageSave(Bitmap src, int scale, string asSaveFile, int aiWidth, int aiHeight)  {   int w = src.Width;   int h = src.Height;   if (scale < 100)   {    w = aiWidth;    h = aiHeight;   }   Bitmap dest = new Bitmap(w, h);   Graphics g = Graphics.FromImage(dest);   g.SmoothingMode = SmoothingMode.HighQuality;   g.InterpolationMode = InterpolationMode.High;   g.DrawImage(src, 0, 0, w, h);   g.Dispose();   dest.Save(asSaveFile, ImageFormat.Jpeg);   dest.Dispose();  }

public static FileExtension CheckFileExtension(string fileName){if (!File.Exists(fileName)){return FileExtension.VALIDFILE;}FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);System.IO.BinaryReader br = new System.IO.BinaryReader(fs);string fileType = string.Empty;FileExtension extension = FileExtension.VALIDFILE;try{byte data = br.ReadByte();fileType += data.ToString();data = br.ReadByte();fileType += data.ToString();extension = (FileExtension)Enum.Parse(typeof(FileExtension), fileType);if (extension.ToString().Equals(fileType)){extension = FileExtension.VALIDFILE;}}catch{extension = FileExtension.VALIDFILE;}finally{if (fs != null){fs.Close();br.Close();}}return extension;}public enum FileExtension{JPEG = 255216,TIF = 7373,GIF = 7173,BMP = 6677,PNG = 13780,PDF = 3780,VALIDFILE = 9999999}

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