/// <summary> </summary>
/// <param name="left"></param>
/// <param name="top"></param>
/// <param name="right"></param>
/// <param name="bottom"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public Stream GetImageStream(double left, double top, double right, double bottom, int width, int height)
{
var bitmap = new Bitmap(width, height);
var graphics = Graphics.FromImage(bitmap);
int symbolRadius = SymbolSize / 2;
foreach (var location in Locations)
{
System.Windows.Point mercatorPoint = GeoTransform.WGSToPtvMercator(
new System.Windows.Point(location.Longitude, location.Latitude));
var pixelPoint = new Point(
(int)((mercatorPoint.X - left) / (right - left) * width),
(int)((mercatorPoint.Y - bottom) / (top - bottom) * height));
if (pixelPoint.X < -symbolRadius || pixelPoint.X > width + symbolRadius ||
pixelPoint.Y < -symbolRadius || pixelPoint.Y > height + symbolRadius)
{
continue;
}
graphics.FillEllipse(new SolidBrush(Color.FromArgb(SymbolColor.A, SymbolColor.R, SymbolColor.G, SymbolColor.B)),
pixelPoint.X - symbolRadius, pixelPoint.Y - symbolRadius, SymbolSize, SymbolSize);
}
var memoryStream = new MemoryStream();
bitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png);
memoryStream.Seek(0, SeekOrigin.Begin); // goto stream begin
return(memoryStream);
}
/// <summary> Reads the earthquakes from a csv file and adds them to a clusterer. The clusterer then groups
/// them to clusters. </summary>
/// <returns> Documentation in progress... </returns>
public static TileBasedPointClusterer <Post> ReadCSVFile()
{
var clusterer = new TileBasedPointClusterer <Post>(MapView.LogicalSize, 0, 19);
var filePath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\ClusterData") + @"\wikilocations.csv";
using (var reader = new CsvFileReader(filePath, (char)0x09))
{
var row = new CsvRow();
while (reader.ReadRow(row))
{
if (row.Count < 3)
{
continue;
}
double x, y;
bool parsed = Double.TryParse(row[2], NumberStyles.Float, CultureInfo.InvariantCulture, out x);
x = parsed ? x : Double.NaN;
parsed = Double.TryParse(row[1], NumberStyles.Float, CultureInfo.InvariantCulture, out y);
y = parsed ? y : Double.NaN;
var post = new Post {
Title = row[0], Location = new Point(x, y)
};
post.TransformedLocation = GeoTransform.WGSToPtvMercator(post.Location);
clusterer.AddPoint(post.TransformedLocation.X, post.TransformedLocation.Y, 1, post);
}
}
#region doc:clusterer.Cluster method call
clusterer.Cluster();
return(clusterer);
#endregion //doc:clusterer.Cluster method call
}
private void addSymbol(Point coordinate, Symbol symbol, ScaleTransform adjustTransform)
{
// create button and set pin template
var image = new Image
{
// create cached bimap
Source = createBitmap(symbol),
// scale around center
RenderTransformOrigin = new Point(.5, .5),
// set render transform for scaling
RenderTransform = adjustTransform,
};
image.Width = image.Height = symbol.Size;
// set tool tip information
ToolTipService.SetToolTip(image, symbol.Tooltip);
// tranform to map coordinates
var mercatorPoint = GeoTransform.WGSToPtvMercator(coordinate);
// set position and add to canvas (invert y-ordinate)
SetLeft(image, mercatorPoint.X - image.Width / 2);
SetTop(image, -(mercatorPoint.Y + image.Height / 2));
Children.Add(image);
}
/// <summary> Converts a geographic point to a canvas point. </summary>
/// <param name="geoPoint"> The geographic point. </param>
/// <returns> The canvas point. </returns>
public Point GeoToCanvas(Point geoPoint)
{
return(PtvMercatorToCanvas(GeoTransform.WGSToPtvMercator(geoPoint)));
}
/// <summary> Reads the earthquakes from an xml file and adds a pin element for each to the map. </summary>
private void ParseAtomUsingLinq()
{
System.Xml.Linq.XDocument feedXML = System.Xml.Linq.XDocument.Load("http://earthquake.usgs.gov/earthquakes/catalogs/7day-M2.5.xml");
System.Xml.Linq.XNamespace xmlns = "http://www.w3.org/2005/Atom"; //Atom namespace
System.Xml.Linq.XNamespace georssns = "http://www.georss.org/georss"; //GeoRSS Namespace
// time to learn some LINQ
var posts = (from item in feedXML.Descendants(xmlns + "entry")
select new
{
Title = item.Element(xmlns + "title").Value,
Published = DateTime.Parse(item.Element(xmlns + "updated").Value),
Url = item.Element(xmlns + "link").Attribute("href").Value,
Description = item.Element(xmlns + "summary").Value,
Location = CoordinateGeoRssPoint(item.Element(georssns + "point")),
//Simple GeoRSS <georss:point>X Y</georss.point>
}).ToList();
int i = 0;
// order posts by latitude, so they overlap nicely on the map
foreach (var post in from post in posts orderby post.Location.Y descending select post)
{
if (!double.IsNaN(post.Location.X) && !double.IsNaN(post.Location.Y))
{
// transform wgs to PTVMercator coordinate
var mapPoint = GeoTransform.WGSToPtvMercator(post.Location);
// create button and set pin template
var pin = new Pin
{
// a bug in SL throws an obscure exception if children share the same name
// http://forums.silverlight.net/forums/t/134299.aspx
// the name is needed in XAML for data binding, so just create a unique name at runtime
Name = "pin" + (i++),
// set render transform for power-law scaling
RenderTransform = adjustTransform,
// scale around lower right
RenderTransformOrigin = new System.Windows.Point(1, 1)
};
// set size by magnitude
double magnitude = MagnitudeFromTitle(post.Title);
pin.Height = magnitude * 10;
pin.Width = magnitude * 10;
// calculate a value between 0 and 1 and use it for a blend color
double relativeDanger = Math.Max(0, Math.Min(1, (magnitude - 2.5) / 4));
pin.Color = Colors.Red;
pin.Color = ColorBlend.Danger.GetColor((float)relativeDanger);
// set tool tip information
ToolTipService.SetToolTip(pin, post.Title);
// set position and add to canvas (invert y-ordinate)
// set lower right (pin-tip) as position
SetLeft(pin, mapPoint.X - pin.Width);
SetTop(pin, -(mapPoint.Y + pin.Height));
Children.Add(pin);
}
}
}