private PureImage GetTileImageWithoutBranding(GPoint pos, int zoom)
{
PureImage cleanTile = null;
const int brandingHeight = 25;
// we fetch a tile which is 25px bigger at the top as well as at the bottom
var brandedTile = GetTileImage(pos, zoom, new Size(
DefaultTileSize.Width,
DefaultTileSize.Height + brandingHeight * 2));
// now we cut away the additional 25px at the upper and lower border
// this will automatically also cut away the branding / copyright of the tile
if (brandedTile != null)
{
using (brandedTile)
using (var tempBitmap = new Bitmap(brandedTile.Data))
using (var cropped = CropImage(tempBitmap, new Rectangle(
0, // x
brandingHeight, // y
DefaultTileSize.Width, // width
DefaultTileSize.Height))) // height
{
var memoryStream = new MemoryStream();
cropped.Save(memoryStream, ImageFormat.Png);
memoryStream.Position = 0;
cleanTile = TileImageProxy.FromStream(memoryStream);
cleanTile.Data = memoryStream;
}
}
return(cleanTile);
}
public PureImage ReadImageFile(GPoint pos, int zoom)
{
string tile_file = string.Format(tile_file_path, zoom, pos.X, pos.Y);
if (!File.Exists(tile_file))
{
return(null);//文件不存在
}
//FileStream fs = File.OpenRead(tile_file); //OpenRead
byte[] data = File.ReadAllBytes(tile_file);
MemoryStream ms = new MemoryStream(data);
//int filelength = 0;
//filelength = (int)fs.Length; //获得文件长度
//Byte[] image = new Byte[filelength]; //建立一个字节数组
//fs.Read(image, 0, filelength); //按字节流读取
PureImage ret = GMapProvider.TileImageProxy.FromStream(ms);
if (ms.Length > 0)
{
ret = TileImageProxy.FromStream(ms);
if (ret != null)
{
ret.Data = ms;
ret.Data.Position = 0;
}
else
{
ms.Dispose();
}
}
ms = null;
//fs.Close();
return(ret);
//Bitmap bit = new Bitmap(result);
//return bit;
}