// gets the tile set of maps with the given coords of the center, width and height of tiling
// and configuration for the center tile
public static void DownloadNewTileSet(MapConfiguration config, BackgroundWorker worker)
{
String fileName = Directory.GetCurrentDirectory().ToString() + @"\Images\" + config.MapSetName + ".map";
using (StreamWriter file = new StreamWriter(fileName))
{
Tuple <int, int> centerPoint = MapConversion.LatLongToPixelXY(config.Latitude,
config.Longitude, config.Zoom);
file.WriteLine(config.ImgWidth + "x" + config.ImgHeight + "|" + config.Latitude + ","
+ config.Longitude + "|" + config.Zoom + "|" + config.Scale + "|" + config.MapType);
// center of the tiling is 0,0
int startx = -config.TilingWidth / 2;
int starty = -config.TilingHeight / 2;
if (config.TilingWidth % 2 == 0)
{
startx++;
}
if (config.TilingHeight % 2 == 0)
{
starty++;
}
int numberDownloaded = 0;
for (int i = startx; i <= config.TilingWidth / 2; i++)
{
for (int j = starty; j <= config.TilingHeight / 2; j++)
{
if (worker != null)
{
worker.ReportProgress(numberDownloaded);
}
Tuple <double, double> newCoords = MapConversion.PixelXYToLatLong
(centerPoint.Item1 + (i * config.ImgWidth), centerPoint.Item2
+ (j * config.ImgHeight), config.Zoom);
config.Latitude = newCoords.Item1;
config.Longitude = newCoords.Item2;
string imageName = Fetch(config);
if (imageName != null)
{
file.WriteLine(i + "," + j + "|" + imageName);
}
numberDownloaded++;
}
}
}
}
private static void CropImage(string file, MapConfiguration config, MemoryStream inStream)
{
// this was done all to the documentation
ISupportedImageFormat format = new PngFormat();
Size size = new Size(config.ImgWidth * config.Scale, config.ImgHeight * config.Scale);
Rectangle crop = new Rectangle(new Point(0, config.Scale * MapConfiguration.LOGO_BLEED / 2), size);
using (ImageFactory imageFactory = new ImageFactory(preserveExifData: true))
{
imageFactory.Load(inStream)
.Crop(crop)
.Resize(size)
.Format(format)
.Save(file);
}
}
// pulls a single map tile from google maps returns the hash code used for the file name.
// Will return null if the image was not downloaded
public static String Fetch(MapConfiguration config)
{
String requestUrl = "https://maps.googleapis.com/maps/api/staticmap?" + config.URLParams();
bool notDownloaded = true;
HttpWebResponse response = null;
while (notDownloaded)
{
HttpWebRequest request = WebRequest.CreateHttp(requestUrl);
try
{
response = (HttpWebResponse)request.GetResponse();
notDownloaded = false;
} catch (WebException ex)
{
Console.WriteLine(ex.Status + " " + ex.Message);
Console.WriteLine("Retrying Download");
}
}
Stream input = response.GetResponseStream();
// writes to the buffer stream
using (MemoryStream buffer = new MemoryStream())
{
input.CopyTo(buffer);
//hash code generator
SHA256Managed sha = new SHA256Managed();
buffer.Position = 0;
byte[] hash = sha.ComputeHash(buffer);
var bufferHash = BitConverter.ToString(hash).Replace("-", String.Empty).Substring(0, 16);
String fileName = Directory.GetCurrentDirectory().ToString() + @"\Images\" + bufferHash + ".jpg";
if (File.Exists(fileName))
{
return(bufferHash); // Already saved the file
}
buffer.Position = 0;
CropImage(fileName, config, buffer);
return(bufferHash);
}
}
public static void DownloadNewTileSet(MapConfiguration config)
{
DownloadNewTileSet(config, null);
}
