/// <summary>
/// When Metadata.xml is downloaded, let's parse it and create a list of ImageMetadata objects. ZOrder can be used to uniquely identify an image. So let's use it as the key of our dictionary for faster searching.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
XDocument doc = XDocument.Parse(e.Result);
this._imageMetadatas = new Dictionary <int, ImageMetadata>();
this._conversations = new Dictionary <int, ConversationControl>();
var imageElements = doc.Root.Elements("Image");
foreach (XElement imageElement in imageElements)
{
int zOrder = int.Parse(imageElement.Element("ZOrder").Value);
ImageMetadata metadata = new ImageMetadata()
{
FileName = imageElement.Element("FileName").Value,
X = double.Parse(imageElement.Element("x").Value),
Y = double.Parse(imageElement.Element("y").Value),
Width = double.Parse(imageElement.Element("Width").Value),
Height = double.Parse(imageElement.Element("Height").Value),
ZOrder = zOrder,
Tag = imageElement.Element("Tag").Value
};
this._imageMetadatas.Add(zOrder, metadata);
ConversationControl conversationControl = new ConversationControl()
{
ConversationText = metadata.Tag, Visibility = Visibility.Collapsed
};
this.LayoutRoot.Children.Add(conversationControl);
this._conversations.Add(zOrder, conversationControl);
}
}
/// <summary>
/// Display the tag for a sub image that hit tested.
/// </summary>
private void HitTestImage()
{
for (int i = 0; i < this.msi.SubImages.Count; i++)
{
MultiScaleSubImage subImage = this.msi.SubImages[i];
if (HitTest(subImage))
{
//ZOrder starts from 1 rather than 0.
ImageMetadata metadata = this._imageMetadatas[i + 1];
ConversationControl conversationControl = this._conversations[i + 1];
Point topLeft = this.msi.LogicalToElementPoint(new Point(-subImage.ViewportOrigin.X / subImage.ViewportWidth, -subImage.ViewportOrigin.Y / subImage.ViewportWidth + 1 / subImage.ViewportWidth / subImage.AspectRatio));
conversationControl.translate.X = topLeft.X;
conversationControl.translate.Y = topLeft.Y;
conversationControl.Visibility = Visibility.Visible;
}
else
{
ConversationControl conversationControl = this._conversations[i + 1];
conversationControl.Visibility = Visibility.Collapsed;
}
}
}
