protected virtual ElementImage LoadMissingTileFromServer(int zoom, int x, int y)
{
try
{
// calculate the tiles bounding box and set its properties.
GeoCoordinate top_left = TileToWorldPos(x, y, zoom);
GeoCoordinate bottom_right = TileToWorldPos(x + 1, y + 1, zoom);
string url = string.Format(_tiles_url,
zoom,
x,
y);
// get file from tile server.
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(
url);
request.Timeout = 5000;
//Debug.WriteLine(url);
WebResponse myResp = request.GetResponse();
Stream stream = myResp.GetResponseStream();
Image img = Bitmap.FromStream(stream);
if (_transparency_color != null)
{
Bitmap transparent_map = new Bitmap(img.Width, img.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
Graphics transparent_map_graphics = Graphics.FromImage(transparent_map);
ImageAttributes imageAttributes = new ImageAttributes();
//substitute blue for white to achieve the expected aim
ColorMap colorMap = new ColorMap();
colorMap.OldColor = _transparency_color.Value;
colorMap.NewColor = Color.Transparent;
//set up color remapping table
ColorMap[] remapTable = { colorMap };
//set up the color info for the image
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
transparent_map_graphics.DrawImage(img,
new Rectangle(0, 0, transparent_map.Width, transparent_map.Height), //target rectangle
0, 0, // upper left corner of the source image
transparent_map.Width, // width of the source image
transparent_map.Height, // height of the source image
GraphicsUnit.Pixel,
//color info
imageAttributes);
img = transparent_map;
}
ElementImage tile = new ElementImage(top_left, bottom_right, img);
stream.Close();
stream.Dispose();
return tile;
}
catch (WebException)
{
}
catch (ArgumentException)
{
}
return null;
}
public ElementImage AddImage(
Image image,
GeoCoordinate coordinate)
{
ElementImage image_element =
new ElementImage(coordinate, image);
lock (_elements)
{
_elements.Add(image_element);
}
return image_element;
}
public ElementImage SubTile(bool xTop, bool yTop)
{
Image im = new Bitmap(_image.Width >> 1, Image.Height >> 1);
Graphics g = Graphics.FromImage(im);
Rectangle rec = new Rectangle(
xTop ? _image.Width >> 1 : 0,
yTop ? _image.Height >> 1 : 0,
_image.Width >> 1,
_image.Height >> 1);
g.DrawImage(_image, 0, 0, rec, GraphicsUnit.Pixel);
double bott = this.Box.MinLat;
double left = this.Box.MinLon;
double h = (this.Box.MaxLat - this.Box.MinLat) / 2;
double w = (this.Box.MaxLon - this.Box.MinLon) / 2;
if (xTop) left += w;
if (!yTop) bott += h;
ElementImage tile = new ElementImage(bott + h, bott, left, left + w, im);
return tile;
}
protected override Elements.ElementImage LoadMissingTileFromServer(int zoom, int x, int y)
{
string quad_key = this.TileXYToQuadKey(x,y,zoom);
int server = OsmSharp.Tools.Math.Random.StaticRandomGenerator.Get().Generate(4);
string url = string.Format(this.TilesUrl, server, quad_key, _version, "en", string.Empty);
try
{
// calculate the tiles bounding box and set its properties.
GeoCoordinate top_left = TileToWorldPos(x, y, zoom);
GeoCoordinate bottom_right = TileToWorldPos(x + 1, y + 1, zoom);
// get file from tile server.
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(
url);
request.Timeout = 60000;
Debug.WriteLine(url);
WebResponse myResp = request.GetResponse();
Stream stream = myResp.GetResponseStream();
Image img = Bitmap.FromStream(stream);
ElementImage tile = new ElementImage(top_left, bottom_right, img);
stream.Close();
stream.Dispose();
return tile;
}
catch (WebException)
{
}
return null;
}
public static ElementImage Merge4Tiles(ElementImage[] tiles)
{
if (tiles.Length == 0) return null;
Image im = new Bitmap(tiles[0].Image.Width << 1, tiles[0].Image.Height << 1);
Graphics g = Graphics.FromImage(im);
double bott = tiles.Min(t => t.Box.MinLat);
double left = tiles.Min(t => t.Box.MinLon);
double h = tiles.Max(t => t.Box.MaxLat) - bott;
double w = tiles.Max(t => t.Box.MaxLon) - left;
for (int i = 0; i < tiles.Length; i++)
{
Point pt = new Point();
int x = Convert.ToInt32((tiles[i].Box.MinLon - left) / w * im.Width);
int y = Convert.ToInt32((tiles[i].Box.MinLat - bott) / h * im.Width);
pt.X = x;
pt.Y = im.Height >> 1 - y;
g.DrawImageUnscaled(tiles[i].Image, pt);
}
ElementImage tile = new ElementImage(bott + h, bott, left, left + w, im);
return tile;
}
