龙年新作：水印文字添加工具源码摘要

 

下载地址：http://www.xdowns.com/soft/31/93/2012/Soft_84985.html

 

源码要点核心：生成添加水印文字后的图片。

 

using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Media; using System.Windows.Media.Imaging; namespace ImageProc { public class WaterText { /// <summary> /// 生成添加水印后的图象。 /// </summary> /// <param name="src">用于在其上添加水印的源图象，一个ImageSource的子类的对象。</param> /// <param name="rect">一个Rect结构，表示要生成的图象的大小。</param> /// <param name="test">水印文本。</param> /// <param name="fontFamily">使用的字体名称，如宋体等。</param> /// <param name="fontSize">字体大小。</param> /// <param name="DpiX">要生成的图象的水平分辨率（建议96以上）。</param> /// <param name="DpiY">要生成的图象的垂直分辨率（建议96以上）。</param> /// <param name="PaddingH">水平边距。</param> /// <param name="PaddingV">垂直边距。</param> /// <param name="loca">水印在图象中的位置，一个WaterLocation枚举。</param> /// <param name="wcolor">水印文字的颜色。</param> /// <param name="IsBold">水印文字是否加粗。</param> /// <param name="IsItalic">水印文是否倾斜。</param> /// <returns>一个ImageSource实例，表示处理后的图象。</returns> public BitmapSource BuildIamge(BitmapSource src, Rect rect, string test, string fontFamily, double fontSize, double DpiX, double DpiY, double PaddingH, double PaddingV, WaterLocation loca, Color wcolor, bool IsBold, bool IsItalic) { DrawingVisual drv = new DrawingVisual(); // 通过DrawingVisual的RenderOpen方法返回一个DrawingContext using (DrawingContext dc = drv.RenderOpen()) { // 绘制图象 dc.DrawImage(src, rect); // 设置文字 FontFamily fontf = new FontFamily(fontFamily); FontStyle MyFontStyle = IsItalic == true ? FontStyles.Italic : FontStyles.Normal; FontWeight MyFontWeight = IsBold == true ? FontWeights.Bold : FontWeights.Normal; Typeface tface = new Typeface(fontf, MyFontStyle, MyFontWeight, FontStretches.Normal); SolidColorBrush cb = new SolidColorBrush(wcolor); FormattedText ft = new FormattedText( test, System.Globalization.CultureInfo.CurrentCulture, FlowDirection.LeftToRight, tface, fontSize, cb); // 确定文本的位置 double newX = 0, newY = 0; TextAlignment MyAlignment = TextAlignment.Left; switch (loca) { case WaterLocation.TopLeft: newX = PaddingH; newY = PaddingV; MyAlignment = TextAlignment.Left; break; case WaterLocation.TopCenter: newX = PaddingH; newY = PaddingV; MyAlignment = TextAlignment.Center; break; case WaterLocation.TopRight: newX = PaddingH; newY = PaddingV; MyAlignment = TextAlignment.Right; break; case WaterLocation.MidLeft: newX = PaddingH; newY = ((rect.Height - PaddingV * 2) - ft.Height) / 2; MyAlignment = TextAlignment.Left; break; case WaterLocation.MidCenter: newX = PaddingH; newY = ((rect.Height - PaddingV * 2) - ft.Height) / 2; MyAlignment = TextAlignment.Center; break; case WaterLocation.MidRight: newX = PaddingH; newY = ((rect.Height - PaddingV * 2) - ft.Height) / 2; MyAlignment = TextAlignment.Right; break; case WaterLocation.BottomLeft: newX = PaddingH; newY = rect.Height - PaddingV - ft.Height; MyAlignment = TextAlignment.Left; break; case WaterLocation.BottomCenter: newX = PaddingH; newY = rect.Height - PaddingV - ft.Height; MyAlignment = TextAlignment.Center; break; case WaterLocation.BottomRight: newX = PaddingH; newY = rect.Height - PaddingV - ft.Height; MyAlignment = TextAlignment.Right; break; default: break; } ft.MaxTextWidth = rect.Width - 2 * PaddingH; ft.TextAlignment = MyAlignment; // 绘制文字 dc.DrawText(ft, new Point(newX, newY)); } RenderTargetBitmap rdb = new RenderTargetBitmap( src.PixelWidth, src.PixelHeight, DpiX, DpiY, PixelFormats.Default); // 通过该方法呈现可视化对象。 rdb.Render(drv); return rdb; } } /// <summary> /// 水印的位置 /// </summary> public enum WaterLocation { /// <summary> /// 左上角 /// </summary> TopLeft, /// <summary> /// 顶部居中 /// </summary> TopCenter, /// <summary> /// 右上角 /// </summary> TopRight, /// <summary> /// 中部居左 /// </summary> MidLeft, /// <summary> /// 中部居中 /// </summary> MidCenter, /// <summary> /// 中部居右 /// </summary> MidRight, /// <summary> /// 左下角 /// </summary> BottomLeft, /// <summary> /// 底部居中 /// </summary> BottomCenter, /// <summary> /// 右下角 /// </summary> BottomRight } }

源码要点1：初始屏幕中的按钮，在打开图片前显示，存在已打开图片后隐藏，类似QQ影音。

这里自定义了一个转换器，如果Image的Source属性为null，则按钮的Visibility属性为Visible，否则为Collapsed。

/// <summary> /// 类型转换器 /// </summary> [ValueConversion(typeof(ImageSource), typeof(Visibility))] public class VisibleConvert : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value == null) { return Visibility.Visible; } else { return Visibility.Collapsed; } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return null; } }

接着，把这个转换器用到Binding中，对按钮进行绑定。

Binding myBinding = new Binding(); myBinding.Path = new PropertyPath(Image.SourceProperty); myBinding.Converter = new VisibleConvert(); myBinding.Source = this.img; myBinding.Mode = BindingMode.OneWay; BindingOperations.SetBinding(btnOpenBig, Button.VisibilityProperty, myBinding);

源码要点2：“打开”和“保存”对话框。

WPF中没有这些对话框组件，但是，我们不要忘了，在WinForm里面，有OpenFileDialog类和SaveFileDialog类。

但是，System.Windows.Forms命名空间下，个别类型的名字与System.Windows命名空间下的类型名字相同，也就是说，WinForm中用到的许多类和WPF中的类名字相同，但它们是不同逻辑的，所以，在引入命名空间的时候，应当使用别名，这样在代码中使用的时候就不会发生冲突了。

using DW = System.Drawing; using WF = System.Windows.Forms; using IO = System.IO;

所以，在保存文件的时候，我们可以这样写代码。

WF.SaveFileDialog saveDlg = new WF.SaveFileDialog(); int MyIndex = this.cmbFormat.SelectedIndex; saveDlg.Title = "保存文件"; BitmapEncoder MyEncoder = null; switch (MyIndex) { case 0: saveDlg.FileName = @"outPut.jpg"; MyEncoder = new JpegBitmapEncoder(); break; case 1: saveDlg.FileName = @"outPut.bmp"; MyEncoder = new BmpBitmapEncoder(); break; case 2: saveDlg.FileName = @"outPut.png"; MyEncoder = new PngBitmapEncoder(); break; default: saveDlg.FileName = @"outPut.jpg"; MyEncoder = new JpegBitmapEncoder(); break; } if (saveDlg.ShowDialog() == WF.DialogResult.OK) { string fileName = saveDlg.FileName; try { using (IO.FileStream fs = IO.File.Open(fileName, IO.FileMode.OpenOrCreate, IO.FileAccess.Write)) { MyEncoder.Frames.Add(BitmapFrame.Create((BitmapSource)this.img.Source)); MyEncoder.Save(fs); fs.Close(); } MessageBox.Show("保存成功。", "提示", MessageBoxButton.OK, MessageBoxImage.Information); } catch (Exception ex) { MessageBox.Show(ex.Message, "提示", MessageBoxButton.OK, MessageBoxImage.Warning); } }

源码要点3：如何取得程序标题和版本号。

程序标题栏上的文字是在运行后动态生成的，可以通过反射技术，在窗口类构造函数中设置。

我们先为窗口类定义两个公共属性，分别用来取得程序标题和版本号。

/// <summary> /// 程序标题 /// </summary> public string TitleText { get { object[] objs = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyTitleAttribute), false); if (objs.Length > 0) { AssemblyTitleAttribute attr = (AssemblyTitleAttribute)objs[0]; return attr.Title; } return string.Empty; } } /// <summary> /// 返回程序版本 /// </summary> public string AppVersion { get { string ver = Assembly.GetExecutingAssembly().GetName().Version.ToString(); if (ver != "") { return ver; } return string.Empty; } }