private static void UpdateGraphicsAndRenderer(KmlGraphicsLayer layer, UniqueValueRenderer renderer, string key)
{
foreach (var graphic in layer.Graphics)
{
var f = (PlacemarkDescriptor)graphic.GetValue(FeaturePlacemarkerDescriptorProperty);
if (f.Symbol.style.IconHref != null && f.Symbol.style.IconHref.ToLower() == key)
{
graphic.Symbol = PointSymbolDescriptor.GetDefaultSymbol();
ComputeIconTranslationValues(f.Symbol.style, graphic.Symbol as KmlPlaceMarkerSymbol, ((graphic.Symbol as KmlPlaceMarkerSymbol).Fill as ImageBrush).ImageSource as BitmapImage);
string l = null, d = null;
GetRendererInfo(f, f.Symbol.style, out l, out d);
var info = renderer.Infos.FirstOrDefault(i => i.Label == l);
if (info != null)
{
info.Symbol = graphic.Symbol;
}
}
}
}
/// <summary>
/// Extracts a point from the input element and applies style information to the placemark descriptor.
/// </summary>
/// <param name="kmlStyle">KML Style information.</param>
/// <param name="point">Point geometry information.</param>
/// <returns>A PlacemarkDescriptor object representing the feature.</returns>
private static PlacemarkDescriptor ExtractPoint(KMLStyle kmlStyle, XElement point)
{
XNamespace kmlNS = point.Name.Namespace;
XElement coord = point.Element(kmlNS + "coordinates");
if (coord != null)
{
// Extract geometry
ESRI.ArcGIS.Client.Geometry.Geometry geom = ExtractCoordinate(coord.Value);
if (geom != null)
{
// Create symbol and use style information
PointSymbolDescriptor sym = new PointSymbolDescriptor();
sym.style = kmlStyle;
// Create feature descriptor from geometry and other information
PlacemarkDescriptor fd = new PlacemarkDescriptor()
{
Geometry = geom,
Symbol = sym
};
return fd;
}
}
return null;
}
/// <summary>
/// Creates graphic elements and adds them to the graphics layer.
/// </summary>
/// <param name="layer">Graphics layer that will have features added to it.</param>
/// <param name="images">Dictionary of images coming from kmz content or from previous parsing</param>
public void CreateGraphics(KmlGraphicsLayer layer, IDictionary <string, ImageBrush> images)
{
if (layer == null)
{
return;
}
GraphicCollection graphics = new GraphicCollection();
UniqueValueRenderer renderer = new UniqueValueRenderer(); // dummy renderer used to create the legend items (since creation of the swatches from the symbol is not that obvious)
// Process each metadata feature in the list
foreach (PlacemarkDescriptor feature in placemarks)
{
KMLStyle style = feature.Symbol.style;
if (style.ZipFile != null)
{
// Look for the image in the zip file
if (style.IconImage == null && !String.IsNullOrEmpty(style.IconHref))
{
style.IconImage = GetIconImage(style.ZipFile, style.IconHref.ToLower());
}
style.ZipFile.Dispose();
style.ZipFile = null;
}
//Define handlers upfront so we can unhook from them
#if SILVERLIGHT
EventHandler <RoutedEventArgs>
#else
EventHandler
#endif
imageCompleted = null;
#if SILVERLIGHT
EventHandler <ExceptionRoutedEventArgs>
#else
EventHandler <ExceptionEventArgs>
#endif
imageFailed = null;
// If the style has an HREF then it is associated with an image
if (style.IconImage == null && !String.IsNullOrEmpty(style.IconHref))
{
// If the image is already loaded in the image dictionary, use it
if (images.ContainsKey(style.IconHref.ToLower()))
{
style.IconImage = images[style.IconHref.ToLower()];
}
else
{
// Get the image using the HREF and store the image in the images dictionary so that if
// other features reference it, it is cached
style.IconImage = GetIconImage(style.IconHref);
if (style.IconImage != null && (style.IconImage as ImageBrush).ImageSource != null)
{
var bi = (style.IconImage as ImageBrush).ImageSource as BitmapImage;
if (bi != null)
{
imageFailed = (s, e) =>
{
var b = s as BitmapImage;
#if SILVERLIGHT
if (imageCompleted != null)
{
b.ImageOpened -= imageCompleted;
}
if (imageFailed != null)
{
b.ImageFailed -= imageFailed;
}
#else
if (imageCompleted != null)
{
b.DownloadCompleted -= imageCompleted;
}
if (imageFailed != null)
{
b.DownloadFailed -= imageFailed;
}
#endif
var key = b.GetValue(BitmapImageKeyProperty) as string;
layer.Dispatcher.BeginInvoke((Action) delegate
{
UpdateGraphicsAndRenderer(layer, renderer, key);
});
};
#if SILVERLIGHT
bi.ImageFailed += imageFailed;
#else
bi.DownloadFailed += imageFailed;
#endif
}
}
images.Add(style.IconHref.ToLower(), style.IconImage);
}
}
// Create a new graphic from the metadata and construct the symbol using polymorphism
Graphic g = new Graphic()
{
Geometry = feature.Geometry,
Symbol = feature.Symbol.CreateSymbol(),
TimeExtent = feature.TimeExtent
};
g.SetValue(FeaturePlacemarkerDescriptorProperty, feature);
// Create legend entry
string label;
string description;
GetRendererInfo(feature, style, out label, out description);
if (!string.IsNullOrEmpty(label) && !renderer.Infos.Any(info => info.Label == label))
{
renderer.Infos.Add(new UniqueValueInfo {
Label = label, Description = description, Symbol = g.Symbol
});
}
// Adjust and assign picture marker symbol properties
if (g.Geometry is ESRI.ArcGIS.Client.Geometry.MapPoint && g.Symbol is KmlPlaceMarkerSymbol)
{
try
{
KmlPlaceMarkerSymbol ms = g.Symbol as KmlPlaceMarkerSymbol;
// To match sizing of Google Earth, default size of point images is 40x40
ms.Height = 40;
ms.Width = 40;
ms.Fill = style.IconImage;
ms.IconColor = style.IconColor;
// Default to half the pixel size (width and height) if symbol offsets are 0 (supported in wpf and sl3)
ImageBrush ib = ms.Fill;
BitmapImage bi = ib.ImageSource as BitmapImage;
#if SILVERLIGHT
if (bi.PixelHeight == 0 || bi.PixelWidth == 0)
#else
if (bi.IsDownloading)
#endif
{
imageCompleted = (s, e) =>
{
var b = s as BitmapImage;
#if SILVERLIGHT
if (imageCompleted != null)
{
b.ImageOpened -= imageCompleted;
}
if (imageFailed != null)
{
b.ImageFailed -= imageFailed;
}
#else
if (imageCompleted != null)
{
b.DownloadCompleted -= imageCompleted;
}
if (imageFailed != null)
{
b.DownloadFailed -= imageFailed;
}
#endif
ComputeIconTranslationValues(style, ms, b);
};
#if SILVERLIGHT
bi.ImageOpened += imageCompleted;
#else
bi.DownloadCompleted += imageCompleted;
#endif
}
else
{
ComputeIconTranslationValues(style, ms, bi);
}
}
catch
{
g.Symbol = PointSymbolDescriptor.GetDefaultSymbol();
ComputeIconTranslationValues(style, g.Symbol as KmlPlaceMarkerSymbol, ((g.Symbol as KmlPlaceMarkerSymbol).Fill as ImageBrush).ImageSource as BitmapImage);
var info = renderer.Infos.FirstOrDefault(i => i.Label == label);
if (info != null)
{
info.Symbol = g.Symbol;
}
}
}
// Copy attributes values from metadata to graphic
foreach (var attribute in feature.Attributes)
{
g.Attributes.Add(attribute.Key, attribute.Value);
}
// If the balloontext property has been assigned a value in the style associated with this
// graphic feature, then add it to the attributes collection.
if (!String.IsNullOrEmpty(style.BalloonText))
{
g.Attributes.Add("balloonText", style.BalloonText);
}
// Add graphic to graphics layer
graphics.Add(g);
}
layer.Graphics = graphics;
// keep the renderer for further usage (when QueryLegendInfos is called)
layer.RendererBasedOnStyle = renderer;
}
