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;            }        }