winform中实现图片左旋,右旋
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 }
贴出来的核心代码：