Question

我需要创建一个包含多个部分的PDF，并且在每个部分之后需要添加一行，但我不知道在哪里绘制这一行。

我需要找到确切的坐标[x，y]，其中文档中的下一个元素将被写入。

Answer 1

就像@Olaf说的那样，使用GetVerticalPosition获取Y。 X只是文档的LeftMargin。以下是针对iTextSharp 5.1.1.0的全功能WinForms应用程序，希望能够满足您的需求：

using System;
using System.Text;
using System.Windows.Forms;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Test file name
            string TestFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Test.pdf");

            //Standard iTextSharp setup
            using (FileStream fs = new FileStream(TestFile, FileMode.Create, FileAccess.Write, FileShare.None))
            {
                using (Document doc = new Document(PageSize.LETTER))
                {
                    using (PdfWriter w = PdfWriter.GetInstance(doc, fs))
                    {
                        //Open the document for writing
                        doc.Open();

                        //Will hold our current x,y coordinates;
                        float curY;
                        float curX;

                        //Add a paragraph
                        doc.Add(new Paragraph("It was the best of times"));

                        //Get the current Y value
                        curY = w.GetVerticalPosition(true);

                        //The current X is just the left margin
                        curX = doc.LeftMargin;

                        //Set a color fill
                        w.DirectContent.SetRGBColorStroke(0, 0, 0);
                        //Set the x,y of where to start drawing
                        w.DirectContent.MoveTo(curX, curY);
                        //Draw a line
                        w.DirectContent.LineTo(doc.PageSize.Width - doc.RightMargin, curY);
                        //Fill the line in
                        w.DirectContent.Stroke();

                        //Add another paragraph
                        doc.Add(new Paragraph("It was the word of times"));

                        //Repeat the above. curX never really changes unless you modify the document's margins
                        curY = w.GetVerticalPosition(true);

                        w.DirectContent.SetRGBColorStroke(0, 0, 0);
                        w.DirectContent.MoveTo(curX, curY);
                        w.DirectContent.LineTo(doc.PageSize.Width - doc.RightMargin, curY);
                        w.DirectContent.Stroke();


                        //Close the document
                        doc.Close();
                    }
                }
            }

            this.Close();
        }
    }
}

Answer 2

我相信只有y位置可用：尝试

PdfWriter.getVerticalPosition()

Answer 3

确实只有y位置。

但是如果需要渲染一些简单的文本，然后放一张图片或画一条线，他总是可以计算渲染文本的大小：

var chunk = new Chunk(String.Format("Sample text {0}", ));                                                             
document.Add(new Paragraph(t));
float curY = writer.GetVerticalPosition(false);
float x = document.Left + chunk.GetWidthPoint();

Answer 4

如果你只需要在当前部分之后画一条线，也许你不需要知道当前的x和y。试试这个：

        iTextSharp.text.pdf.draw.DottedLineSeparator sepLINE = new iTextSharp.text.pdf.draw.DottedLineSeparator();

        sepLINE.LineWidth = 1;
        sepLINE.Gap = 2;
        sepLINE.Percentage = 50;
        sepLINE.LineColor = new iTextSharp.text.BaseColor(System.Drawing.Color.Blue);

        Chunk chnkLINE = new Chunk(sepLINE);
        pdfDoc.Add(chnkLINE);

如何在iTextSharp中找到当前（X，Y）位置？

4 个答案: