一步一步 ITextSharp Anchor Image Chapter Section使用

上一篇对块,语句、段落、列表进行了演示,本篇将对更高级的对象Anchor、Image、Chapter、Section的使用方法进行演示。

一、Anchor

Anchor对象可以在文档内部或向外部跳转。内部跳转常见的应用就是目录,外部跳转就是跳转到指定的文件或网页。下面代码演示文档内部跳转和跳转到博客园点。

   1: public class AnchorDemo : TestBase
   2:     {
   3:         protected override void WriteDocument(Document document, PdfWriter writer)
   4:         {
   5:             Paragraph p = new Paragraph();
   6:             p.Add("这是一个Anchor测试演示示例:");
   7:  
   8:             Anchor anchor = new Anchor("首页",Normal);
   9:             anchor.Name = "first";
  10:             var anchor2 = new Anchor("第二页", Normal);
  11:             anchor2.Reference = "#second";
  12:             var anchor3 = new Anchor("第三页", Normal);
  13:             anchor3.Reference = "#third";
  14:             p.Add(anchor);
  15:             p.Add(anchor2);
  16:             p.Add(anchor3);
  17:  
  18:             var anchor10 = new Anchor("博客园-学无止境", Normal);
  19:             anchor10.Reference = "http://www.cnblogs.com/LifelongLearning/";
  20:             document.Add(p);
  21:             document.Add(anchor10);
  22:  
  23:             document.NewPage();
  24:             var anchor1 = new Anchor("第二页", Normal);
  25:             anchor1.Name = "second";
  26:             document.Add(anchor1);
  27:  
  28:             var anchor4 = new Anchor("回到首页", Normal);
  29:             anchor4.Reference = "#first";
  30:             document.Add(anchor4);
  31:  
  32:             document.NewPage();
  33:             var anchor5 = new Anchor("第三页", Normal);
  34:             anchor5.Name = "third";
  35:             document.Add(anchor5);
  36:  
  37:             var anchor6 = new Anchor("回到首页", Normal);
  38:             anchor6.Reference = "#first";
  39:             document.Add(anchor6);
  40:         }
  41:     }

本节对演示代码进行了重构,基类代码请查看:一步一步 IText.Sharp

上面的代码演示结果如下:

image

Chunk也可以创建跳转链接,

Chunk.SetLocalDestination 设置本地描述名称,可以说它是当前锚点的名称

Chunk.SetLocalGoto   设置本地跳转到锚点

Chunk.SetRemoteGoto 设置远程跳转,如url

示例代码如下:

   1: public class GoTopDemo : TestBase
   2:     {
   3:         protected override void WriteDocument(Document document, PdfWriter writer)
   4:         {
   5:             Paragraph p = new Paragraph();
   6:             Chunk top = new Chunk("Country List", Bolditalic);
   7:             top.SetLocalDestination("top");
   8:             p.Add(top);
   9:             document.Add(p);
  10:             Chunk imdb =
  11:               new Chunk("博客园", Bolditalic);
  12:             imdb.SetAnchor(new Uri("http://www.cnblogs.com/"));
  13:             p = new Paragraph("点击每页的返回首页,将返回到第一页,",Normal);
  14:             p.Add(imdb);
  15:             p.Add(".");
  16:             document.Add(p);
  17:             p = new Paragraph("This list can be found in a ");
  18:             Chunk page1 = new Chunk("分割文档(本地文档跳转)", Normal);
  19:             page1.SetRemoteGoto("helloworld2.pdf", 1);
  20:             p.Add(page1);
  21:             p.Add(".");
  22:             document.Add(p);
  23:  
  24:             document.NewPage();
  25:             p = new Paragraph("返回", Normal);
  26:             top = new Chunk("首页", Normal);
  27:             top.SetLocalGoto("top");
  28:             p.Add(top);
  29:             p.Add(".");
  30:             document.Add(p);
  31:             document.NewPage();
  32:             p = new Paragraph("返回", Normal);
  33:             top = new Chunk("首页", Normal);
  34:             top.SetLocalGoto("top");
  35:             p.Add(top);
  36:             p.Add(".");
  37:             document.Add(p);
  38:  
  39:             document.NewPage();
  40:             p = new Paragraph("返回", Normal);
  41:             top = new Chunk("首页", Normal);
  42:             top.SetLocalGoto("top");
  43:             p.Add(top);
  44:             p.Add(".");
  45:             document.Add(p);
  46:  
  47:             document.NewPage();
  48:             p = new Paragraph("返回");
  49:             top = new Chunk("首页");
  50:             top.SetLocalGoto("top");
  51:             p.Add(top);
  52:             p.Add(".");
  53:             document.Add(p);
  54:  
  55:             document.NewPage();
  56:             p = new Paragraph("返回");
  57:             top = new Chunk("首页");
  58:             top.SetLocalGoto("top");
  59:             p.Add(top);
  60:             p.Add(".");
  61:             document.Add(p);
  62:         }
  63:     }

二、Chapter与Section

Chapter和Section用来创建书签和文档结构非常有用。同时使用PdfOutline也可以创建书签,默认情况下,生成章节和分区使用的是数字标识,如下所示:

image

代码如下:

   1: public class ChapterDemo2 : TestBase
   2:     {
   3:         protected override void WriteDocument(Document document, PdfWriter writer)
   4:         {
   5:             string[] contries = new string[] { "美国", "英国", "中国", "朝鲜", "日本" };
   6:  
   7:             Paragraph title = null;
   8:             Chapter chapter = null;
   9:             Section section = null;
  10:             Section subsection = null;
  11:             title = new Paragraph("标题一", Normal);
  12:             chapter = new Chapter(title, 1);
  13:             title = new Paragraph("区域一", Bolditalic);
  14:             section = chapter.AddSection(title, 2);
  15:             title = new Paragraph("子区域一", Normal);
  16:             subsection = section.AddSection(title);
  17:  
  18:             subsection.IndentationLeft = (20);
  19:             subsection.NumberDepth = (1);
  20:             subsection.Add(new Paragraph("时间: " + 12, Normal));
  21:             subsection.Add(new Paragraph("导演(s):", Normal));
  22:             subsection.Add(GetDirectorList(contries));
  23:             subsection.Add(new Paragraph("国家:", Normal));
  24:             subsection.Add(GetDirectorList(contries));
  25:  
  26:             document.Add(chapter);
  27:         }
  28:  
  29:         private List GetDirectorList(string[] list)
  30:         {
  31:             List result = new List();
  32:             foreach (var c in list)
  33:             {
  34:                 result.Add(new ListItem(c, Normal));
  35:             }
  36:  
  37:  
  38:             return result;
  39:         }
  40:     }

三、Image

在ITextSharp中使用Image.getInstance方法创建Image对象,支持的文件类型包括:

Jpeg, PngImage, GifImage,
TiffImage

itextsharp会自动调整图文的内容,以让页面显示更多的内容,如果要禁用这种情况,就要使用如下方法:

   1: PdfWriter.GetInstance(document,new FileStream(filename)).StrictImageSequence = true;

强制使用添加顺序。

图像有对象方式,有如下几种:左对齐、右对齐、居中对齐、自动调整,

图像的位置可以通过,上下左右来设置控制,同时可以通过:ScalePercent,ScaleToFit,

ScaleAbsolute,scaleAbsoluteWidth,scaleAbsoluteHeight调整图像显示大小,对于布局的控制非常方便。

备注:如果同一个图像创建多次并都添加到文档中,文档的大小就增长很快,如果一个图像要在多个地方使用,只要生成一个Image对象,在添加到文档前,设置其属性就可以了,没有必要创建多份。

图像还支持旋转:

RotationDegrees,这个是设置旋转的角度,可以设置正负数。

演示示例效果如下:

imageimage

代码如下:

   1: public class ImageDemo : TestBase
   2:     {
   3:         protected override void WriteDocument(Document document, PdfWriter writer)
   4:         {
   5:             writer.StrictImageSequence = true;
   6:             document.Add(new Paragraph("左对齐:", Normal));
   7:             Image image = CreateImageObject();
   8:             image.Alignment = Image.ALIGN_LEFT;
   9:             image.ScalePercent(30);
  10:             document.Add(image);
  11:  
  12:             document.Add(new Paragraph("右对齐:", Normal));
  13:             //image = CreateImageObject();
  14:             image.ScalePercent(30);
  15:             image.Alignment = Image.ALIGN_RIGHT;
  16:             document.Add(image);
  17:  
  18:             document.Add(new Paragraph("居中对齐:", Normal));
  19:             //image = CreateImageObject();
  20:             image.Alignment = Image.ALIGN_MIDDLE;
  21:             image.ScaleToFit(150,300);
  22:             document.Add(image);
  23:  
  24:             document.Add(new Paragraph("适合页面对齐:", Normal));
  25:             //image = CreateImageObject();
  26:             image.Alignment = Image.ALIGN_JUSTIFIED_ALL;
  27:             image.ScalePercent(30);
  28:             document.Add(image);
  29:             document.NewPage();
  30:             var p = new Paragraph("旋转一:", Normal);
  31:             p.Add(Chunk.NEWLINE);
  32:  
  33:             p.Add(Chunk.NEWLINE);
  34:             p.Add(Chunk.NEWLINE);
  35:             p.Add(Chunk.NEWLINE);
  36:             p.Add(Chunk.NEWLINE);
  37:             p.Add(Chunk.NEWLINE);
  38:             p.Add(Chunk.NEWLINE);
  39:             p.Add(Chunk.NEWLINE);
  40:             p.Add(Chunk.NEWLINE);
  41:             p.Add(Chunk.NEWLINE);
  42:             p.Add(Chunk.NEWLINE);
  43:             p.Add(Chunk.NEWLINE);
  44:             p.Add(Chunk.NEWLINE);
  45:             image.Alignment = Image.ALIGN_JUSTIFIED_ALL;
  46:             image.ScalePercent(30);
  47:             image.RotationDegrees = 30;
  48:             p.Add(new Chunk(image, 0, -30));
  49:             document.Add(p);
  50:  
  51:             p = new Paragraph("旋转二:", Normal);
  52:             p.Add(Chunk.NEWLINE);
  53:             p.Add(Chunk.NEWLINE);
  54:             p.Add(Chunk.NEWLINE);
  55:             p.Add(Chunk.NEWLINE);
  56:             p.Add(Chunk.NEWLINE);
  57:             p.Add(Chunk.NEWLINE);
  58:             p.Add(Chunk.NEWLINE);
  59:             p.Add(Chunk.NEWLINE);
  60:             p.Add(Chunk.NEWLINE);
  61:             p.Add(Chunk.NEWLINE);
  62:             p.Add(Chunk.NEWLINE);
  63:             p.Add(Chunk.NEWLINE);
  64:             p.Add(Chunk.NEWLINE);
  65:             image.Alignment = Image.ALIGN_JUSTIFIED_ALL;
  66:             image.ScalePercent(30);
  67:             image.RotationDegrees = -30;
  68:             p.Add(new Chunk(image, 0, -15));
  69:             document.Add(p);
  70:         }
  71:  
  72:         private Image CreateImageObject()
  73:         {
  74:             return Image.GetInstance(@"C:\Users\Public\Pictures\Sample Pictures\123.jpg");
  75:         }
  76:     }
原文地址:https://www.cnblogs.com/LifelongLearning/p/2001196.html