在 iTextSharp 中的 ColumnText 上设置字体和大小

Question

我正在向现有的 pdf 模板添加一些文本、图像和 html 字符串。我设法添加了文本和图像，但是当我将 html 元素添加到 ColumnText 时，我无法弄清楚如何在该特定 ColumnText 上设置字体和大小。

有什么方法可以设置 ColumnText 的字体和大小？

const string oldFile = "c:\\template.pdf";
const string newFile = "c:\\brandNewFile.pdf";
const string lightFontFile = "c:\\HelveticaNeueLight.ttf";
const string boldFontFile = "c:\\HelveticaNeueBoldItalic.ttf";
const string thinlight = "c:\\HelveticaNeueThinItalic.ttf";
const string logo = "c:\\logo.png";

// open the reader
var reader = new PdfReader(oldFile);
Rectangle size = reader.GetPageSizeWithRotation(1);
var document = new Document(size);

// open the writer
var fs = new FileStream(newFile, FileMode.Create, FileAccess.Write);
var writer = PdfWriter.GetInstance(document, fs);
document.Open();

// the pdf content
PdfContentByte cb = writer.DirectContent;

// Very nice font and size
var veryNiceBaseFont = BaseFont.CreateFont(boldFontFile, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
cb.SetColorFill(new BaseColor(0x00, 0x57, 0x94)); // Certain BLUE RGB
cb.SetFontAndSize(veryNiceBaseFont, 11f);

// Add text
cb.BeginText();
text = "Here is an amazing text that I add on top of the template!";
cb.SetCharacterSpacing(0.8f);
cb.ShowTextAligned(PdfContentByte.ALIGN_LEFT, text, 79, 582, 0);
cb.EndText();

// Different font
var paragraphBaseFont = BaseFont.CreateFont(lightFontFile, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
cb.SetColorFill(BaseColor.BLACK); 
cb.SetFontAndSize(paragraphBaseFont, 12f);

// Add more text
cb.BeginText();
string text = "More text in different font";
cb.SetCharacterSpacing(0.8f);
cb.ShowTextAligned(PdfContentByte.ALIGN_LEFT, text, 79, 600, 0);
cb.EndText();

// Add the logo image
Image image = Image.FromFile(logo);
iTextSharp.text.Image pic = iTextSharp.text.Image.GetInstance(image, ImageFormat.Png);
if (pic.Height > pic.Width)
{
    //Maximum height is 800 pixels.
    float percentage = 0.0f;
    percentage = 110 / pic.Height;
    pic.ScalePercent(percentage * 100);
}
else
{
    //Maximum width is 600 pixels.
    float percentage = 0.0f;
    percentage = 80 / pic.Width;
    pic.ScalePercent(percentage * 100);
}
pic.SetAbsolutePosition(440, 575);
cb.AddImage(pic);

// Create the new page and add it to the pdf
PdfImportedPage page = writer.GetImportedPage(reader, 1);
cb.AddTemplate(page, 0, 0);

// create the html part of the document
string html =
    "<p>This is a paragraph. Derp derp derp derp !</p>" +
    "<p><strong><span style=\"color: #005794;\">With some style and such.</span></strong></p>" +
    "<p>DERP</p>" +
    "<p><span style=\"color: #ed1c24;\">DERP</span></p>" +
    "<p>DERP</p>";


var elements = XMLWorkerHelper.ParseToElementList(html, null);
var paragraph = new Paragraph();
paragraph.Font = new Font(iTextSharp.text.Font.FontFamily.HELVETICA, 10f); //not working!!!!
//TODO: I am confused, should I try to set font as above, or somehow set columntext?
foreach (var es in elements)
{
    paragraph.Add(es);
    paragraph.Add(Chunk.NEWLINE);
}
var ct = new ColumnText(cb);
ct.SetSimpleColumn(paragraph, 80, 460, 475, 0, 15, Element.ALIGN_LEFT);
ct.Go();

// close the streams and voilá the file should be changed :)
document.Close();
fs.Close();
writer.Close();
reader.Close();

缩写代码（我被要求删除 cmets 中不必要的代码）：

    // create the html part of the document
string html =
    "<p>This is a paragraph. Derp derp derp derp !</p>" +
    "<p><strong><span style=\"color: #005794;\">With some style and such.</span></strong></p>" +
    "<p>DERP</p>" +
    "<p><span style=\"color: #ed1c24;\">DERP</span></p>" +
    "<p>DERP</p>";


var elements = XMLWorkerHelper.ParseToElementList(html, null);
var paragraph = new Paragraph();
paragraph.Font = new Font(iTextSharp.text.Font.FontFamily.HELVETICA, 10f); //not working!!!!
//TODO: I am confused, should I try to set font as above, or somehow set columntext?
foreach (var es in elements)
{
    paragraph.Add(es);
    paragraph.Add(Chunk.NEWLINE);
}
var ct = new ColumnText(cb);
ct.SetSimpleColumn(paragraph, 80, 460, 475, 0, 15, Element.ALIGN_LEFT);
ct.Go();

Answer 1

我找到了一种更改 IElement 的 BaseFont 的方法，因此可以设置我想要的任何字体和大小（但也保留内联标记样式的字体粗细和颜色）。

以下是上述缩写代码的示例：

string html =
    "<p>This is a paragraph. Derp derp derp derp !</p>" +
    "<p><strong><span style=\"color: #005794;\">With some style and such.</span></strong></p>" +
    "<p>DERP</p>" +
    "<p><span style=\"color: #ed1c24;\">DERP</span></p>" +
    "<p>DERP</p>";

var elements = XMLWorkerHelper.ParseToElementList(html, null);
var paragraph = new Paragraph();
foreach (var es in elements)
{
    // 
    var tempBase = BaseFont.CreateFont(lightFontFile, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
    var tempFont = new Font(tempBase, es.Chunks[0].Font.Size, es.Chunks[0].Font.Style, es.Chunks[0].Font.Color);
    foreach (var chunk in es.Chunks)
    {
        chunk.Font = tempFont;
    }
    paragraph.Add(es);
    paragraph.Add(Chunk.NEWLINE);
}
var ct = new ColumnText(cb);
ct.SetSimpleColumn(paragraph, 80, 460, 475, 0, 15, Element.ALIGN_LEFT);
ct.Go();