/// <summary>
/// 获取指定宽高压缩后的百分比
/// </summary>
/// <param name="width">目标宽</param>
/// <param name="height">目标高</param>
/// <param name="containerRect">原始对象</param>
/// <returns>目标与原始对象百分比</returns>
public static float GetPercentage(float width, float height, CanvasRectangle containerRect)
{
float percentage = 0;
if (height > width)
{
percentage = containerRect.RectHeight / height;
if (width * percentage > containerRect.RectWidth)
{
percentage = containerRect.RectWidth / width;
}
}
else
{
percentage = containerRect.RectWidth / width;
if (height * percentage > containerRect.RectHeight)
{
percentage = containerRect.RectHeight / height;
}
}
return(percentage);
}
/// <summary>
/// 指定pdf模板文件添加图片
/// </summary>
/// <param name="tempFilePath"></param>
/// <param name="createdPdfPath"></param>
/// <param name="pdfImages"></param>
public void PutImages(string tempFilePath, string createdPdfPath, List <PdfImage> pdfImages)
{
PdfReader pdfReader = null;
PdfStamper pdfStamper = null;
try
{
pdfReader = new PdfReader(tempFilePath);
pdfStamper = new PdfStamper(pdfReader, new FileStream(createdPdfPath, FileMode.OpenOrCreate));
var pdfContentByte = pdfStamper.GetOverContent(1);//获取PDF指定页面内容
foreach (var pdfImage in pdfImages)
{
Uri uri = null;
Image img = null;
var imageUrl = pdfImage.ImageUrl;
//如果使用网络路径则先将图片转化位绝对路径
if (imageUrl.StartsWith("http"))
{
//var absolutePath = Path.Combine(System.Web.HttpContext.Current.Server.MapPath(".."), imageUrl);
var absolutePath = System.Web.HttpContext.Current.Server.MapPath("..") + imageUrl;
uri = new Uri(absolutePath);
img = Image.GetInstance(uri);
}
else
{
//如果直接使用图片文件则直接创建iTextSharp的Image对象
if (pdfImage.ImgBytes != null)
{
img = Image.GetInstance(new MemoryStream(pdfImage.ImgBytes));
}
}
if (img != null)
{
if (pdfImage.ScaleParent)
{
var containerRect = pdfImage.ContainerRect;
float percentage = 0.0f;
percentage = CanvasRectangle.GetPercentage(img.Width, img.Height, containerRect);
img.ScalePercent(percentage * 100);
pdfImage.AbsoluteX = (containerRect.RectWidth - img.Width * percentage) / 2 + containerRect.StartX;
pdfImage.AbsoluteY = (containerRect.RectHeight - img.Height * percentage) / 2 + containerRect.StartY;
}
else
{
img.ScaleToFit(pdfImage.FitWidth, pdfImage.FitHeight);
}
img.SetAbsolutePosition(pdfImage.AbsoluteX, pdfImage.AbsoluteY);
pdfContentByte.AddImage(img);
}
}
pdfStamper.FormFlattening = true;
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (pdfStamper != null)
{
pdfStamper.Close();
}
if (pdfReader != null)
{
pdfReader.Close();
}
pdfStamper = null;
pdfReader = null;
}
}