private CropRectangle GetDefaultCrop(XmlElement widthNode, XmlElement heightNode, XmlElement selectedCrop)
{
// Work out the correct crop positon if there is no crop provided
CropRectangle crop = new CropRectangle();
decimal width = decimal.Parse(widthNode.InnerText);
decimal height = decimal.Parse(heightNode.InnerText);
decimal targetWidth = decimal.Parse(selectedCrop.SelectSingleNode(@"jll_width", _nsManagerDataset).InnerText);
decimal targetHeight = decimal.Parse(selectedCrop.SelectSingleNode(@"jll_height", _nsManagerDataset).InnerText);
crop.width = targetWidth;
crop.height = targetHeight;
// Normalise
decimal sourceAspectRatio = width / height;
decimal targetAspectRatio = targetWidth / targetHeight;
height = 1;
width = sourceAspectRatio;
targetHeight = 1;
targetWidth = targetAspectRatio;
// Centre the crop
decimal widthPercentage = targetWidth / width;
decimal heightPercentage = targetHeight / height;
crop.top = ((1 - heightPercentage) / 2) * 100;
crop.bottom = crop.top;
crop.left = ((1 - widthPercentage) / 2) * 100;
crop.right = crop.left;
return(crop);
}
private static CropRectangle GetUserDefinedCropRectangle(string cropParameter, XmlElement cropsNode)
{
if (cropsNode == null)
{
return(null);
}
CropRectangle crop = null;
string pictureCropData = cropsNode.InnerText;
// Get the aspect ratio using the name from the available crops
using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(pictureCropData)))
{
// Desieralise the aspect ratios
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Dictionary <string, CropRectangle>), new DataContractJsonSerializerSettings {
UseSimpleDictionaryFormat = true
});
var crops = (Dictionary <string, CropRectangle>)ser.ReadObject(ms);
// Select the correct aspect ratio
foreach (string key in crops.Keys)
{
if (key == cropParameter)
{
crop = crops[key];
break;
}
}
}
return(crop);
}
/// <summary>
/// Image Expression consists of [xpath],[aspect ratio name]
/// The aspect ratio is optional
/// </summary>
/// <param name="datasets"></param>
/// <param name="xpath"></param>
/// <param name="annotationid"></param>
/// <returns></returns>
private PackagePart GetAnnotationImage(XmlDocument datasets, string xpath, out string annotationid, out CropRectangle crop)
{
// Extract the crop
crop = null;
string[] parts = xpath.Split(',');
xpath = parts[0];
string cropParameter = parts.Length > 1 ? parts[1] : null;
string expr = ExpandXPath(xpath);
if (expr.EndsWith("/"))
{
expr += ".";
}
Trace("GetImageNode:{0}", expr);
XmlElement noteNode = (XmlElement)datasets.SelectSingleNode(expr, _nsManagerDataset);
if (noteNode == null)
{
annotationid = Guid.Empty.ToString();
return(null);
}
XmlElement mimeTypeNode = (XmlElement)noteNode.SelectSingleNode(@"mimetype", _nsManagerDataset);
XmlElement bodyNode = (XmlElement)noteNode.SelectSingleNode(@"documentbody", _nsManagerDataset);
XmlElement urlNode = (XmlElement)noteNode.SelectSingleNode(@"url", _nsManagerDataset);
XmlElement annotationidNode = (XmlElement)noteNode.SelectSingleNode(@"annotationid", _nsManagerDataset);
XmlElement fileNameNode = (XmlElement)noteNode.SelectSingleNode(@"filename", _nsManagerDataset);
XmlElement widthNode = (XmlElement)noteNode.SelectSingleNode(@"width", _nsManagerDataset);
XmlElement heightNode = (XmlElement)noteNode.SelectSingleNode(@"height", _nsManagerDataset);
XmlElement cropsNode = (XmlElement)noteNode.SelectSingleNode(@"crops", _nsManagerDataset);
if (mimeTypeNode == null)
{
throw new Exception("Cannot find the mimetype node for image");
}
if (bodyNode == null && urlNode == null)
{
throw new Exception("Cannot find the body or url node for image");
}
if (annotationidNode == null)
{
throw new Exception("Cannot find the annotationid node for image");
}
if (fileNameNode == null)
{
throw new Exception("Cannot find the filename node for image");
}
// Is there a crop selected?
if (cropParameter != null)
{
XmlElement selectedCrop = (XmlElement)datasets.SelectSingleNode("//datasets/AspectRatios/Entity[jll_name='" + cropParameter + "']", _nsManagerDataset);
if (selectedCrop != null)
{
crop = GetUserDefinedCropRectangle(cropParameter, cropsNode);
if (crop == null && widthNode != null && heightNode != null)
{
crop = GetDefaultCrop(widthNode, heightNode, selectedCrop);
}
}
}
// Determine if it's already added as a part - if not add it
annotationid = annotationidNode.InnerText;
string fileName = GetImageFileName(new Guid(annotationid), fileNameNode.InnerText);
string imageData = null;
bool imageDataCollected = false;
if (bodyNode != null)
{
imageData = bodyNode.InnerText;
//imageDataCollected = true;
}
else if (DownloadAndEmbedImageUrls)
{
// Download the image
try
{
using (WebClient webClient = new WebClient())
{
// TODO: optimise for quality and set max width /upload/q_auto/if_w_gt_1500,w_1500/v14
// TODO: use cloudinary cropping rather than PPT upload/x_0.0,y_0.0,w_1.0,h_1.0,c_crop
var imageBytes = webClient.DownloadData(urlNode.InnerText);
imageData = Convert.ToBase64String(imageBytes);
imageDataCollected = true;
}
}
catch (Exception e)
{
}
}
if (!imageDataCollected)
{
string mimetype = mimeTypeNode.InnerText;
var imagePart = AddImage(new Guid(annotationid), imageData, mimetype, fileName);
return(imagePart);
}
else if (urlNode != null)
{
// We are embedding a url - make the annotiationid the url
annotationid = urlNode.InnerText;
return(null);
}
throw new Exception("Cannot find image url/data");
}