/// <summary>
///
/// </summary>
/// <param name="imageSourceList"></param>
/// <param name="outPath"></param>
/// <returns></returns>
public async Task ConvertImages2PdfAsync(IEnumerable <string> imageSourceList, string outPath)
{
await Task.Run(() =>
{
//var pdfWriter = new PdfWriter(outPath,
// new WriterProperties().SetStandardEncryption(user, owner,
// EncryptionConstants.ALLOW_PRINTING | EncryptionConstants.ALLOW_ASSEMBLY,
// EncryptionConstants.ENCRYPTION_AES_256));
var pdfWriter = new PdfWriter(outPath);
var pdfDocument = new PdfDocument(pdfWriter);
var document = new Document(pdfDocument);
foreach (var imageSource in imageSourceList)
{
var imageData = ImageDataFactory.Create(imageSource);
var image = new iText.Layout.Element.Image(imageData);
var a4Width = PageSize.A4.GetWidth();
var a4Height = PageSize.A4.GetHeight();
if (image.GetImageHeight() > a4Height - 25)
{
image.ScaleToFit(a4Width - 25, a4Height - 25);
}
else if (image.GetImageWidth() > a4Width - 25)
{
image.ScaleToFit(a4Width - 25, a4Height - 25);
}
image.SetHorizontalAlignment(HorizontalAlignment.CENTER);
document.Add(image);
}
document.Close();
});
}
/// <summary>
/// 利用itext7生成文字签名
/// </summary>
public void ConvertPdf1()
{
string sourcePath = $"C:\\test\\source.pdf";
string targetPath = $"C:\\test\\target.pdf";
string fontPath = $"C:\\Windows\\Fonts\\simkai.ttf";
string signPath1 = @"C:\Users\Administrator\Desktop\a.png";
string signPath2 = @"C:\Users\Administrator\Desktop\b.png";
string signPath3 = @"C:\Users\Administrator\Desktop\c.png";
string signPath4 = @"C:\Users\Administrator\Desktop\d.png";
//输入PDF
using (iText.Kernel.Pdf.PdfReader reader = new iText.Kernel.Pdf.PdfReader(sourcePath))
{
//输出PDF
using (iText.Kernel.Pdf.PdfWriter writer = new iText.Kernel.Pdf.PdfWriter(targetPath))
{
//获取PDF对象
using (iText.Kernel.Pdf.PdfDocument pdfDocument = new iText.Kernel.Pdf.PdfDocument(reader, writer))
{
//获取Document对象
using (iText.Layout.Document document = new iText.Layout.Document(pdfDocument))
{
//从物理文件加载图片
iText.Layout.Element.Image image1 = new iText.Layout.Element.Image(iText.IO.Image.ImageDataFactory.Create(signPath1));
iText.Layout.Element.Image image2 = new iText.Layout.Element.Image(iText.IO.Image.ImageDataFactory.Create(signPath2));
iText.Layout.Element.Image image3 = new iText.Layout.Element.Image(iText.IO.Image.ImageDataFactory.Create(signPath3));
iText.Layout.Element.Image image4 = new iText.Layout.Element.Image(iText.IO.Image.ImageDataFactory.Create(signPath4));
//将图片绘制到PDF的绝对坐标上，同时缩放图片
//坐标与绘制文字的坐标几乎一致，稍微向左，向上一些
//缩放的宽度与后面的宽度一致，示例中是200
//缩放的高度计算两个签名之间的高度差，例如93-73=20
//注意示例采用的签名图片的尺寸是：400px * 150px，应当采取和它差不多的尺寸效果最佳
document.Add(image1.ScaleToFit(200, 20).SetFixedPosition(1, 3089, 93, 200));
document.Add(image2.ScaleToFit(200, 20).SetFixedPosition(1, 3089, 73, 200));
document.Add(image3.ScaleToFit(200, 20).SetFixedPosition(1, 3089, 53, 200));
document.Add(image4.ScaleToFit(200, 20).SetFixedPosition(1, 3089, 33, 200));
//加载字体
iText.Kernel.Font.PdfFont font = iText.Kernel.Font.PdfFontFactory.CreateFont(fontPath, iText.IO.Font.PdfEncodings.IDENTITY_H, true);
//添加文本
document.Add(new iText.Layout.Element.Paragraph("签名1").SetFont(font).SetFontSize(12).SetFixedPosition(1, 3090, 90, 200));
document.Add(new iText.Layout.Element.Paragraph("签名2").SetFont(font).SetFontSize(12).SetFixedPosition(1, 3090, 70, 200));
document.Add(new iText.Layout.Element.Paragraph("签名3").SetFont(font).SetFontSize(12).SetFixedPosition(1, 3090, 50, 200));
document.Add(new iText.Layout.Element.Paragraph("签名4").SetFont(font).SetFontSize(12).SetFixedPosition(1, 3090, 30, 200));
}
}
}
}
}
public new void ExportToPdf(string path, double width = 700, double height = 370)
{
// exports spectrum annotation w/o base seq annotation
string tempPdfPath = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(path), "temp.pdf");
string tempPngPath = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(path), "annotation.png");
base.ExportToPdf(tempPdfPath, width, height);
// scales for desired DPI
double dpiScale = MetaDrawSettings.CanvasPdfExportDpi / 96.0;
// save base seq as PNG
SequenceDrawingCanvas.Measure(new Size((int)SequenceDrawingCanvas.Width, (int)SequenceDrawingCanvas.Height));
SequenceDrawingCanvas.Arrange(new Rect(new Size((int)SequenceDrawingCanvas.Width, (int)SequenceDrawingCanvas.Height)));
RenderTargetBitmap renderBitmap = new RenderTargetBitmap((int)(dpiScale * SequenceDrawingCanvas.Width), (int)(dpiScale * SequenceDrawingCanvas.Height),
MetaDrawSettings.CanvasPdfExportDpi, MetaDrawSettings.CanvasPdfExportDpi, PixelFormats.Pbgra32);
renderBitmap.Render(SequenceDrawingCanvas);
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
using (FileStream file = File.Create(tempPngPath))
{
encoder.Save(file);
}
// adds base seq annotation to pdf
PdfDocument pdfDoc = new PdfDocument(new PdfReader(tempPdfPath), new PdfWriter(path));
iText.Layout.Document document = new iText.Layout.Document(pdfDoc);
ImageData imgData = ImageDataFactory.Create(tempPngPath);
iText.Layout.Element.Image img = new iText.Layout.Element.Image(imgData);
img.SetMarginLeft((float)(-1.0 * SequenceDrawingCanvas.Margin.Left) + 10);
img.SetMarginTop(-30);
img.ScaleToFit((float)SequenceDrawingCanvas.Width, (float)SequenceDrawingCanvas.Height);
document.Add(img);
document.Close();
pdfDoc.Close();
// delete temp files
File.Delete(tempPdfPath);
File.Delete(tempPngPath);
}