ListFonts.cs
// 完毕:
using System;
using System.IO;
using System.Drawing;
using System.Collections.Generic;
using System.Linq;
using GrapeCity.Documents.Pdf;
using GrapeCity.Documents.Text;
namespace DsPdfWeb.Demos.Basics
{
// 此示例列出了在加载的 PDF 中找到的所有字体,
// 打印每种字体的一些信息,并指示 Font 对象是否
// 可以从 PDF 中的字体创建。
public class ListFonts
{
public int CreatePDF(Stream stream)
{
var sourcePDF = "CompleteJavaScriptBook.pdf";
var doc = new GcPdfDocument();
var page = doc.NewPage();
var rc = Common.Util.AddNote(
"此示例将任意 PDF 加载到临时 GcPdfDocument 中," +
"",
page);
// 渲染文本的文本布局:
var tab = 24;
var tl = page.Graphics.CreateTextLayout();
tl.DefaultFormat.Font = StandardFonts.Times;
tl.DefaultFormat.FontSize = 12;
tl.MaxWidth = doc.PageSize.Width;
tl.MaxHeight = doc.PageSize.Height;
tl.MarginAll = rc.Left;
tl.MarginTop = rc.Bottom + 36;
tl.TabStops = new List<TabStop>()
{
new TabStop(tab)
};
tl.FirstLineIndent = -tab;
tl.MarginRight = 144;
// 寡妇/孤儿控制的文本分割选项:
var to = new TextSplitOptions(tl)
{
KeepParagraphLinesTogether = true,
MinLinesInFirstParagraph = 2,
MinLinesInLastParagraph = 2,
RestMarginTop = rc.Left,
};
// 打开任意 PDF,将其加载到临时文档中并获取所有字体:
using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", sourcePDF));
var doc1 = new GcPdfDocument();
doc1.Load(fs);
var fonts = doc1.GetFonts();
tl.AppendLine($"Total of {fonts.Count} fonts found in {sourcePDF}:");
tl.AppendLine();
int i = 0;
foreach (var font in fonts)
{
var nativeFont = font.CreateNativeFont();
tl.Append($"{i}:\tBaseFont: {font.BaseFont}; IsEmbedded: {font.IsEmbedded}.");
tl.AppendParagraphBreak();
if (nativeFont != null)
tl.AppendLine($"\tCreateNativeFont succeeded, family: {nativeFont.FontFamilyName}; bold: {nativeFont.FontBold}; italic: {nativeFont.FontItalic}.");
else
tl.AppendLine("\tCreateNativeFont failed");
tl.AppendLine();
++i;
}
tl.PerformLayout(true);
while (true)
{
// 'rest' 将接受不适合的文本:
var splitResult = tl.Split(to, out TextLayout rest);
doc.Pages.Last.Graphics.DrawTextLayout(tl, PointF.Empty);
if (splitResult != SplitResult.Split)
break;
tl = rest;
doc.NewPage();
}
// 完毕:
doc.Save(stream);
return doc.Pages.Count;
}
}
}