Pdfium.Net.Free 一个免费的Pdfium的 .net包装器--添加图片

项目地址：

Pdfium.Net：https://github.com/1000374/Pdfium.Net

PdfiumViewer：https://github.com/1000374/PdfiumViewer

Pdfium添加图片有三个重载，根据入参可对添加的图片进行缩放、旋转、裁切

1.添加图片路径到pdf

   /// <summary>
   /// add Image  
   /// </summary>
   /// <param name="imagePath">image file</param>
   /// <param name="posX">x</param>
   /// <param name="posY">y</param>
   /// <param name="scalex">scale x</param>
   /// <param name="scaley">scale y</param>
   /// <param name="rotate">rotate</param>
   /// <param name="shear">shear</param>
   /// <returns></returns>
   public bool AddImage(string imagePath, float posX, float posY, float scalex = 1f, float scaley = 1, float rotate = 0, float shear = 0)

代码示例：

using (var doc = PdfDocument.CreateNew())
{
    var imagePath = "./Pdfium.NetTests/resources/mona_lisa.jpg";
    var page = doc.Pages.Add(612, 792);
    page.AddImage(imagePath, 50, 100);
    doc.Save("./Pdfium.NetTests/AddImage.pdf");
}

2.添加流到pdf

 /// <summary>
 /// add Image  
 /// </summary>
 /// <param name="stream">new MemoryStream(File.ReadAllBytes(imagePath));</param>
 /// <param name="posX">x</param>
 /// <param name="posY">y</param>
 /// <param name="scalex">scale x</param>
 /// <param name="scaley">scale y</param>
 /// <param name="rotate">rotate</param>
 /// <param name="shear">shear</param>
 /// <returns></returns>
 public bool AddImage(Stream stream, float posX, float posY, float scalex = 1f, float scaley = 1, float rotate = 0, float shear = 0)

示例代码：

  using (var doc = PdfDocument.CreateNew())
  {
      var imagePath = "./Pdfium.NetTests/resources/mona_lisa.jpg";
      var page = doc.Pages.Add(612, 792);
      var stream = new MemoryStream(File.ReadAllBytes(imagePath));
      page.AddImage(stream, 50, 100);
      doc.Save("./Pdfium.NetTests/AddImage.pdf");
  }

3.添加image 到pdf

 /// <summary>
 /// add Image  
 /// </summary>
 /// <param name="image">Image</param>
 /// <param name="posX">x</param>
 /// <param name="posY">y</param>
 /// <param name="scalex">scale x</param>
 /// <param name="scaley">scale y</param>
 /// <param name="rotate">rotate</param>
 /// <param name="shear">shear</param>
 /// <returns></returns>
 public bool AddImage(Image image, float posX, float posY, float scalex = 1f, float scaley = 1, float rotate = 0, float shear = 0)
      

代码示例：

  using (var doc = PdfDocument.CreateNew())
  { 
      var imagePath = "./Pdfium.NetTests/resources/mona_lisa.jpg";
      var image = Image.FromFile(imagePath, true);
      var page = doc.Pages.Add(612, 792);
      page.AddImage(image, 50, 100);
      doc.Save("./Pdfium.NetTests/AddImage1.pdf");
  }