public RequestedTileInformation GetTileInformation(long x, long y, int zoom)
{
RequestedTileInformation ti = new RequestedTileInformation();
try
{
ti.mapFile = _mapFile;
ti.X = x;
ti.Y = y;
ti.Zoom = zoom;
ti.ZoomIntervalConfig = this.ZoomIntervalConfig;
if (zoom < ZoomIntervalConfig.BaseZoomLevel)
{
// calculate the XY numbers of the upper left and lower right sub-tiles
int zoomLevelDifference = ZoomIntervalConfig.BaseZoomLevel - zoom;
ti.FromBaseTileX = x << zoomLevelDifference;
ti.FromBaseTileY = y << zoomLevelDifference;
ti.ToBaseTileX = ti.FromBaseTileX + (1 << zoomLevelDifference) - 1;
ti.ToBaseTileY = ti.FromBaseTileY + (1 << zoomLevelDifference) - 1;
ti.UseSubTileBitmapMask = false;
}
else if (zoom > ZoomIntervalConfig.BaseZoomLevel)
{
// calculate the XY numbers of the parent base tile
int zoomLevelDifference = zoom - ZoomIntervalConfig.BaseZoomLevel;
ti.FromBaseTileX = x >> zoomLevelDifference;
ti.FromBaseTileY = y >> zoomLevelDifference;
ti.ToBaseTileX = ti.FromBaseTileX;
ti.ToBaseTileY = ti.FromBaseTileY;
ti.UseSubTileBitmapMask = true;
//calculate ti.SubTileBitmapMask
if (zoomLevelDifference == 1)
{
if (x % 2 == 0 && y % 2 == 0)
{
// upper left quadrant
ti.SubTileBitmapMask = 0xcc00;
}
else if (x % 2 == 1 && y % 2 == 0)
{
// upper right quadrant
ti.SubTileBitmapMask = 0x3300;
}
else if (x % 2 == 0 && y % 2 == 1)
{
// lower left quadrant
ti.SubTileBitmapMask = 0xcc;
}
else
{
// lower right quadrant
ti.SubTileBitmapMask = 0x33;
}
}
else
{
// calculate the XY numbers of the second level sub-tile
long subtileX = x >> (zoomLevelDifference - 2);
long subtileY = y >> (zoomLevelDifference - 2);
// calculate the XY numbers of the parent tile
long parentTileX = subtileX >> 1;
long parentTileY = subtileY >> 1;
// determine the correct bitmask for all 16 sub-tiles
if (parentTileX % 2 == 0 && parentTileY % 2 == 0)
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x8000;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x4000;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x800;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x400;
}
}
else if (parentTileX % 2 == 1 && parentTileY % 2 == 0)
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x2000;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x1000;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x200;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x100;
}
}
else if (parentTileX % 2 == 0 && parentTileY % 2 == 1)
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x80;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x40;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x8;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x4;
}
}
else
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x20;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x10;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x2;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x1;
}
}
}
}
else
{
// use the tile XY numbers of the requested tile
ti.FromBaseTileX = x;
ti.FromBaseTileY = y;
ti.ToBaseTileX = ti.FromBaseTileX;
ti.ToBaseTileY = ti.FromBaseTileY;
ti.UseSubTileBitmapMask = false;
}
ti.FromBlockX = Math.Max(ti.FromBaseTileX - MinX, 0);
ti.FromBlockY = Math.Max(ti.FromBaseTileY - MinY, 0);
ti.ToBlockX = Math.Min(ti.ToBaseTileX - MinX, MaxX);
ti.ToBlockY = Math.Min(ti.ToBaseTileY - MinY, MaxY);
ti.POIs = new List<POI>();
ti.Ways = new List<Way>();
for (long row = ti.FromBlockY; row <= ti.ToBlockY; row++)
{
for (long column = ti.FromBlockX; column <= ti.ToBlockX; column++)
{
// calculate the actual block number of the needed block in the file
long blockNumber = (row * (MaxX - MinX + 1)) + column;
if (blockNumber >= _tileAbsOffsets.Length || _tileAbsOffsets[blockNumber] == 0 || _tileAbsOffsets[blockNumber] >= ZoomIntervalConfig.SubFileSize)
{
continue;
}
long blockSize;
if (blockNumber < _tileAbsOffsets.Length - 1)
{
blockSize = _tileAbsOffsets[blockNumber + 1] - _tileAbsOffsets[blockNumber];
}
else
{
blockSize = ZoomIntervalConfig.SubFileSize - _tileAbsOffsets[blockNumber] + 1;
}
if (blockSize < 1)
{
continue;
}
ti.TileDataBuffer = new byte[blockSize];
_mapFile.ReadBuffer(ti.TileDataBuffer, _tileAbsOffsets[blockNumber] + ZoomIntervalConfig.AbsStartPositionSubFile, (int)blockSize);
using (ti.TileDataBufferStream = new System.IO.MemoryStream(ti.TileDataBuffer))
{
// calculate the top-left coordinates of the underlying tile
ti.TileLatitudeDeg = MapFile.GetLatitude(MinY + row, ZoomIntervalConfig.BaseZoomLevel);
ti.TileLongitudeDeg = MapFile.GetLongitude(MinX + column, ZoomIntervalConfig.BaseZoomLevel);
ti.TileLatitude = (int)(ti.TileLatitudeDeg * 1000000);
ti.TileLongitude = (int)(ti.TileLongitudeDeg * 1000000);
if (_mapFile.Header.DebugInformationPresent)
{
ti.TileDataBufferStream.Position = 32;
}
//get the zoom table
int rows = ZoomIntervalConfig.MaxZoomLevel - ZoomIntervalConfig.MinZoomLevel + 1;
ti.ZoomTable = new int[rows, 2];
int cumulatedNumberOfPois = 0;
int cumulatedNumberOfWays = 0;
for (int r = 0; r < rows; r++)
{
cumulatedNumberOfPois += (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
cumulatedNumberOfWays += (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
ti.ZoomTable[r, 0] = cumulatedNumberOfPois;
ti.ZoomTable[r, 1] = cumulatedNumberOfWays;
}
ti.ZoomTableRow = zoom - ZoomIntervalConfig.MinZoomLevel;
ti.PoisOnQueryZoomLevel = ti.ZoomTable[ti.ZoomTableRow, 0];
ti.WaysOnQueryZoomLevel = ti.ZoomTable[ti.ZoomTableRow, 1];
ti.FirstWayOffset = MapFile.ReadVBEUint(ti.TileDataBufferStream);
ti.FirstWayOffset += ti.TileDataBufferStream.Position;
//get POIs
for (int p = 0; p < ti.PoisOnQueryZoomLevel; p++)
{
POI poi = new POI();
if (_mapFile.Header.DebugInformationPresent)
{
ti.TileDataBufferStream.Position += 32;
}
//lat/lon
poi.Latitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
poi.Longitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
//layer and tag ids
poi.TagIDs = new List<int>();
byte b = (byte)ti.TileDataBufferStream.ReadByte();
poi.Layer = b >> 4;
int tagCount = (b & 0x0F);
for (int t = 0; t < tagCount; t++)
{
poi.TagIDs.Add((int)MapFile.ReadVBEUint(ti.TileDataBufferStream));
}
//flags
b = (byte)ti.TileDataBufferStream.ReadByte();
if ((b & 0x80) == 0x80)
{
poi.Name = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
poi.Name = null;
}
if ((b & 0x40) == 0x40)
{
poi.HouseNumber = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
poi.HouseNumber = null;
}
if ((b & 0x20) == 0x20)
{
poi.Elevation = MapFile.ReadVBESint(ti.TileDataBufferStream);
}
else
{
poi.Elevation = null;
}
ti.POIs.Add(poi);
}
ti.TileDataBufferStream.Position = ti.FirstWayOffset;
//get ways
for (int w = 0; w < ti.WaysOnQueryZoomLevel; w++)
{
Way way = new Way();
if (_mapFile.Header.DebugInformationPresent)
{
ti.TileDataBufferStream.Position += 32;
}
int wayDataSize = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
int subTileBitmap = MapFile.ReadUInt16(ti.TileDataBufferStream);
if (ti.UseSubTileBitmapMask)
{
// check if the way is inside the requested tile
if ((ti.SubTileBitmapMask & subTileBitmap) == 0)
{
// skip the rest of the way and continue with the next way
ti.TileDataBufferStream.Position += (wayDataSize - 2);
continue;
}
}
//layer and tags
way.TagIDs = new List<int>();
byte b = (byte)ti.TileDataBufferStream.ReadByte();
way.Layer = b >> 4;
int tagCount = (b & 0x0F);
for (int t = 0; t < tagCount; t++)
{
way.TagIDs.Add((int)MapFile.ReadVBEUint(ti.TileDataBufferStream));
}
//feature bytes
b = (byte)ti.TileDataBufferStream.ReadByte();
if ((b & 0x80) == 0x80)
{
way.Name = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
way.Name = null;
}
if ((b & 0x40) == 0x40)
{
way.HouseNumber = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
way.HouseNumber = null;
}
if ((b & 0x20) == 0x20)
{
way.Reference = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
way.Reference = null;
}
if ((b & 0x10) == 0x10)
{
way.LabelLatitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
way.LabelLongitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
}
else
{
way.LabelLatitude = null;
way.LabelLongitude = null;
}
int numberOfBlocks;
if ((b & 0x08) == 0x08)
{
numberOfBlocks = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
}
else
{
numberOfBlocks = 1;
}
bool doubleEncoding = ((b & 0x04) == 0x04);
way.WayDataBlocks = new List<Way.WayData>();
for (int wb = 0; wb < numberOfBlocks; wb++)
{
//read: way data
Way.WayData wd = new Way.WayData();
int numberOfWayCoordBlocks = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
wd.DataBlock = new List<Way.WayCoordinateBlock>();
for (int wcd = 0; wcd < numberOfWayCoordBlocks; wcd++)
{
//read way coordinate block
Way.WayCoordinateBlock coordBlock = new Way.WayCoordinateBlock();
coordBlock.CoordBlock = new List<Way.WayCoordinate>();
int nodesCount = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
//Way.WayCoordinate diffwc = wc;
if (doubleEncoding)
{
// get the first way node latitude single-delta offset (VBE-S)
int wayNodeLatitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the first way node longitude single-delta offset (VBE-S)
int wayNodeLongitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// store the first way node
Way.WayCoordinate wc = new Way.WayCoordinate();
wc.Latitude = wayNodeLatitude;
wc.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wc);
int previousSingleDeltaLatitude = 0;
int previousSingleDeltaLongitude = 0;
for (int n = 1; n < nodesCount; n++)
{
// get the way node latitude double-delta offset (VBE-S)
int doubleDeltaLatitude = MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the way node longitude double-delta offset (VBE-S)
int doubleDeltaLongitude = MapFile.ReadVBESint(ti.TileDataBufferStream);
int singleDeltaLatitude = doubleDeltaLatitude + previousSingleDeltaLatitude;
int singleDeltaLongitude = doubleDeltaLongitude + previousSingleDeltaLongitude;
wayNodeLatitude = wayNodeLatitude + singleDeltaLatitude;
wayNodeLongitude = wayNodeLongitude + singleDeltaLongitude;
Way.WayCoordinate wcNext = new Way.WayCoordinate();
wcNext.Latitude = wayNodeLatitude;
wcNext.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wcNext);
previousSingleDeltaLatitude = singleDeltaLatitude;
previousSingleDeltaLongitude = singleDeltaLongitude;
}
}
else
{
// get the first way node latitude single-delta offset (VBE-S)
int wayNodeLatitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the first way node longitude single-delta offset (VBE-S)
int wayNodeLongitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// store the first way node
Way.WayCoordinate wc = new Way.WayCoordinate();
wc.Latitude = wayNodeLatitude;
wc.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wc);
for (int n = 1; n < nodesCount; n++)
{
// get the way node latitude offset (VBE-S)
wayNodeLatitude = wayNodeLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the way node longitude offset (VBE-S)
wayNodeLongitude = wayNodeLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
Way.WayCoordinate wcNext = new Way.WayCoordinate();
wcNext.Latitude = wayNodeLatitude;
wcNext.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wcNext);
}
}
wd.DataBlock.Add(coordBlock);
}
way.WayDataBlocks.Add(wd);
}
ti.Ways.Add(way);
}
}
}
}
ti.TileDataBuffer = null; //memory can be released
}
catch
{
ti = null;
}
return ti;
}
public void RenderLines(RequestedTileInformation ti, Graphics g, Way way, RenderInfo ri)
{
if (way.WayDataBlocks != null && way.WayDataBlocks.Count > 0)
{
bool nDone = false;
float f = getPaintZoomLevel(ti.Zoom);
foreach (Way.WayData wd in way.WayDataBlocks)
{
System.Drawing.PointF[] pa = (from p in wd.DataBlock[0].CoordBlock select new System.Drawing.PointF((float)toRelTileX(p.Longitude, ti.X, ti.Zoom), (float)toRelTileY(p.Latitude, ti.Y, ti.Zoom))).ToArray();
using (GraphicsPath gp = new GraphicsPath())
{
for (int i = 0; i < pa.Length - 1; i++)
{
gp.AddLine(pa[i], pa[i + 1]);
}
Pen p = ri.Pen ?? new Pen(Color.Black);
p.Width = ri.fstroke_width * f;
g.DrawPath(p, gp);
if (ri.FillPen != null)
{
ri.FillPen.Width = ri.fstroke_width * f * 0.8f;
g.DrawPath(ri.FillPen, gp);
}
if (!string.IsNullOrEmpty(way.Name) && p.Width > 6.0f && !nDone)
{
nDone = true; //only once per tile is enough I think
using (Font fnt = new Font(FontFamily.GenericSerif, p.Width))
{
//determine angle of polyline (use start and endpoint?)
//if wrong (text upside down), then reverse polyline
PointF p1 = pa[0];
PointF p2 = pa[pa.Length - 1];
if (p1.X > p2.X)
{
gp.Reverse();
}
g.DrawString(way.Name, fnt, _fixedTextBrush, TextPathAlign.Center, TextPathPosition.CenterPath, 100, 0, gp);
}
}
}
}
}
}
public void RenderAreas(RequestedTileInformation ti, Graphics g, Way way, RenderInfo ri)
{
bool drawOutline = true;
if (way.WayDataBlocks != null && way.WayDataBlocks.Count > 0)
{
foreach (Way.WayData wd in way.WayDataBlocks)
{
if (wd.DataBlock[0].CoordBlock.Count > 2)
{
using (GraphicsPath gp = new GraphicsPath())
{
gp.AddPolygon((from p in wd.DataBlock[0].CoordBlock select new System.Drawing.PointF((float)toRelTileX(p.Longitude, ti.X, ti.Zoom), (float)toRelTileY(p.Latitude, ti.Y, ti.Zoom))).ToArray());
if (wd.DataBlock.Count == 1)
{
g.FillPath(ri.Brush ?? new SolidBrush(Color.Black), gp);
}
else
{
GraphicsPath[] gpExclude = new GraphicsPath[wd.DataBlock.Count - 1];
for (int i = 0; i < gpExclude.Length; i++)
{
gpExclude[i] = new GraphicsPath();
Way.WayCoordinateBlock cb = wd.DataBlock[i + 1];
gpExclude[i].AddPolygon((from p in cb.CoordBlock select new System.Drawing.Point((int)toRelTileX(p.Longitude, ti.X, ti.Zoom), (int)toRelTileY(p.Latitude, ti.Y, ti.Zoom))).ToArray());
}
Region region = new Region(gp);
for (int i = 0; i < gpExclude.Length; i++)
{
region.Exclude(gpExclude[i]);
}
g.FillRegion(ri.Brush ?? new SolidBrush(Color.White), region);
for (int i = 0; i < gpExclude.Length; i++)
{
if (drawOutline && ri.Pen != null)
{
g.DrawPolygon(ri.Pen, gpExclude[i].PathPoints);
}
gpExclude[i].Dispose();
}
}
if (drawOutline && ri.Pen != null)
{
g.DrawPolygon(ri.Pen, gp.PathPoints);
}
}
}
}
}
}
public void RenderCaptions(RequestedTileInformation ti, Graphics g, Way way, RenderInfo ri)
{
int lat;
int lon;
if (way.LabelLatitude != null && way.LabelLongitude != null)
{
lat = (int)way.LabelLatitude;
lon = (int)way.LabelLongitude;
}
else
{
lat = (int)way.WayDataBlocks[0].DataBlock[0].CoordBlock.Average(x => x.Latitude);
lon = (int)way.WayDataBlocks[0].DataBlock[0].CoordBlock.Average(x => x.Longitude);
}
using (Font fnt = new Font(FontFamily.GenericSerif, string.IsNullOrEmpty(ri.font_size) ? (float)10.0 : (float)Utils.Conversion.StringToDouble(ri.font_size), ri.font_style == "bold" ? FontStyle.Bold : FontStyle.Regular))
using (StringFormat sf = new StringFormat())
{
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
float x = (float)toRelTileX(lon, ti.X, ti.Zoom);
float y = (float)toRelTileY(lat, ti.Y, ti.Zoom);
if (x > 0 && x < 256 && y > 0 && y < 256)
{
SizeF s = g.MeasureString(way.Name, fnt);
float w2 = (s.Width / 2.0f);
float h2 = (s.Height / 2.0f);
if (x + w2 > 256) x = 256 - w2;
if (y + h2 > 256) y = 256 - h2;
if (x < w2) x = w2;
if (y < h2) y = h2;
g.DrawString(way.Name, fnt, ri.Brush ?? new SolidBrush(Color.Black), x, y, sf);
}
}
}
public void RenderSymbols(RequestedTileInformation ti, Graphics g, Way way, RenderInfo ri)
{
int lat;
int lon;
if (way.LabelLatitude != null && way.LabelLongitude != null)
{
lat = (int)way.LabelLatitude;
lon = (int)way.LabelLongitude;
}
else
{
lat = (int)way.WayDataBlocks[0].DataBlock[0].CoordBlock.Average(x => x.Latitude);
lon = (int)way.WayDataBlocks[0].DataBlock[0].CoordBlock.Average(x => x.Longitude);
}
g.DrawImageUnscaled(ri.Symbol, (int)toRelTileX(lon, ti.X, ti.Zoom), (int)toRelTileY(lat, ti.Y, ti.Zoom));
}
public void Render(RequestedTileInformation ti, Graphics g, Way way, RenderInfo ri)
{
lock (this) //gdi objects are not threadsafe
{
try
{
if (ri.tag == "area")
{
RenderAreas(ti, g, way, ri);
}
else if (ri.tag == "line")
{
RenderLines(ti, g, way, ri);
}
else if (ri.tag == "caption")
{
RenderCaptions(ti, g, way, ri);
}
else if (ri.tag == "symbol")
{
RenderSymbols(ti, g, way, ri);
}
}
catch
{
}
}
}
public List<RenderInfo> GetMatchedRenderInfo(RequestedTileInformation ti, Way way)
{
List<RenderInfo> result = new List<RenderInfo>();
//now the easy sloppy way
for (int i = 0; i < way.TagIDs.Count; i++ )
{
getMatchedRenderInfo(_renderInfoList, result, "way", ti.mapFile.Header.WayTags[way.TagIDs[i]].Key, ti.mapFile.Header.WayTags[way.TagIDs[i]].Value, ti.Zoom);
}
return result;
}
public RequestedTileInformation GetTileInformation(long x, long y, int zoom)
{
RequestedTileInformation ti = new RequestedTileInformation();
try
{
ti.mapFile = _mapFile;
ti.X = x;
ti.Y = y;
ti.Zoom = zoom;
ti.ZoomIntervalConfig = this.ZoomIntervalConfig;
if (zoom < ZoomIntervalConfig.BaseZoomLevel)
{
// calculate the XY numbers of the upper left and lower right sub-tiles
int zoomLevelDifference = ZoomIntervalConfig.BaseZoomLevel - zoom;
ti.FromBaseTileX = x << zoomLevelDifference;
ti.FromBaseTileY = y << zoomLevelDifference;
ti.ToBaseTileX = ti.FromBaseTileX + (1 << zoomLevelDifference) - 1;
ti.ToBaseTileY = ti.FromBaseTileY + (1 << zoomLevelDifference) - 1;
ti.UseSubTileBitmapMask = false;
}
else if (zoom > ZoomIntervalConfig.BaseZoomLevel)
{
// calculate the XY numbers of the parent base tile
int zoomLevelDifference = zoom - ZoomIntervalConfig.BaseZoomLevel;
ti.FromBaseTileX = x >> zoomLevelDifference;
ti.FromBaseTileY = y >> zoomLevelDifference;
ti.ToBaseTileX = ti.FromBaseTileX;
ti.ToBaseTileY = ti.FromBaseTileY;
ti.UseSubTileBitmapMask = true;
//calculate ti.SubTileBitmapMask
if (zoomLevelDifference == 1)
{
if (x % 2 == 0 && y % 2 == 0)
{
// upper left quadrant
ti.SubTileBitmapMask = 0xcc00;
}
else if (x % 2 == 1 && y % 2 == 0)
{
// upper right quadrant
ti.SubTileBitmapMask = 0x3300;
}
else if (x % 2 == 0 && y % 2 == 1)
{
// lower left quadrant
ti.SubTileBitmapMask = 0xcc;
}
else
{
// lower right quadrant
ti.SubTileBitmapMask = 0x33;
}
}
else
{
// calculate the XY numbers of the second level sub-tile
long subtileX = x >> (zoomLevelDifference - 2);
long subtileY = y >> (zoomLevelDifference - 2);
// calculate the XY numbers of the parent tile
long parentTileX = subtileX >> 1;
long parentTileY = subtileY >> 1;
// determine the correct bitmask for all 16 sub-tiles
if (parentTileX % 2 == 0 && parentTileY % 2 == 0)
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x8000;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x4000;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x800;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x400;
}
}
else if (parentTileX % 2 == 1 && parentTileY % 2 == 0)
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x2000;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x1000;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x200;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x100;
}
}
else if (parentTileX % 2 == 0 && parentTileY % 2 == 1)
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x80;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x40;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x8;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x4;
}
}
else
{
if (subtileX % 2 == 0 && subtileY % 2 == 0)
{
// upper left sub-tile
ti.SubTileBitmapMask = 0x20;
}
else if (subtileX % 2 == 1 && subtileY % 2 == 0)
{
// upper right sub-tile
ti.SubTileBitmapMask = 0x10;
}
else if (subtileX % 2 == 0 && subtileY % 2 == 1)
{
// lower left sub-tile
ti.SubTileBitmapMask = 0x2;
}
else
{
// lower right sub-tile
ti.SubTileBitmapMask = 0x1;
}
}
}
}
else
{
// use the tile XY numbers of the requested tile
ti.FromBaseTileX = x;
ti.FromBaseTileY = y;
ti.ToBaseTileX = ti.FromBaseTileX;
ti.ToBaseTileY = ti.FromBaseTileY;
ti.UseSubTileBitmapMask = false;
}
ti.FromBlockX = Math.Max(ti.FromBaseTileX - MinX, 0);
ti.FromBlockY = Math.Max(ti.FromBaseTileY - MinY, 0);
ti.ToBlockX = Math.Min(ti.ToBaseTileX - MinX, MaxX);
ti.ToBlockY = Math.Min(ti.ToBaseTileY - MinY, MaxY);
ti.POIs = new List <POI>();
ti.Ways = new List <Way>();
for (long row = ti.FromBlockY; row <= ti.ToBlockY; row++)
{
for (long column = ti.FromBlockX; column <= ti.ToBlockX; column++)
{
// calculate the actual block number of the needed block in the file
long blockNumber = (row * (MaxX - MinX + 1)) + column;
if (blockNumber >= _tileAbsOffsets.Length || _tileAbsOffsets[blockNumber] == 0 || _tileAbsOffsets[blockNumber] >= ZoomIntervalConfig.SubFileSize)
{
continue;
}
long blockSize;
if (blockNumber < _tileAbsOffsets.Length - 1)
{
blockSize = _tileAbsOffsets[blockNumber + 1] - _tileAbsOffsets[blockNumber];
}
else
{
blockSize = ZoomIntervalConfig.SubFileSize - _tileAbsOffsets[blockNumber] + 1;
}
if (blockSize < 1)
{
continue;
}
ti.TileDataBuffer = new byte[blockSize];
_mapFile.ReadBuffer(ti.TileDataBuffer, _tileAbsOffsets[blockNumber] + ZoomIntervalConfig.AbsStartPositionSubFile, (int)blockSize);
using (ti.TileDataBufferStream = new System.IO.MemoryStream(ti.TileDataBuffer))
{
// calculate the top-left coordinates of the underlying tile
ti.TileLatitudeDeg = MapFile.GetLatitude(MinY + row, ZoomIntervalConfig.BaseZoomLevel);
ti.TileLongitudeDeg = MapFile.GetLongitude(MinX + column, ZoomIntervalConfig.BaseZoomLevel);
ti.TileLatitude = (int)(ti.TileLatitudeDeg * 1000000);
ti.TileLongitude = (int)(ti.TileLongitudeDeg * 1000000);
if (_mapFile.Header.DebugInformationPresent)
{
ti.TileDataBufferStream.Position = 32;
}
//get the zoom table
int rows = ZoomIntervalConfig.MaxZoomLevel - ZoomIntervalConfig.MinZoomLevel + 1;
ti.ZoomTable = new int[rows, 2];
int cumulatedNumberOfPois = 0;
int cumulatedNumberOfWays = 0;
for (int r = 0; r < rows; r++)
{
cumulatedNumberOfPois += (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
cumulatedNumberOfWays += (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
ti.ZoomTable[r, 0] = cumulatedNumberOfPois;
ti.ZoomTable[r, 1] = cumulatedNumberOfWays;
}
ti.ZoomTableRow = zoom - ZoomIntervalConfig.MinZoomLevel;
ti.PoisOnQueryZoomLevel = ti.ZoomTable[ti.ZoomTableRow, 0];
ti.WaysOnQueryZoomLevel = ti.ZoomTable[ti.ZoomTableRow, 1];
ti.FirstWayOffset = MapFile.ReadVBEUint(ti.TileDataBufferStream);
ti.FirstWayOffset += ti.TileDataBufferStream.Position;
//get POIs
for (int p = 0; p < ti.PoisOnQueryZoomLevel; p++)
{
POI poi = new POI();
if (_mapFile.Header.DebugInformationPresent)
{
ti.TileDataBufferStream.Position += 32;
}
//lat/lon
poi.Latitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
poi.Longitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
//layer and tag ids
poi.TagIDs = new List <int>();
byte b = (byte)ti.TileDataBufferStream.ReadByte();
poi.Layer = b >> 4;
int tagCount = (b & 0x0F);
for (int t = 0; t < tagCount; t++)
{
poi.TagIDs.Add((int)MapFile.ReadVBEUint(ti.TileDataBufferStream));
}
//flags
b = (byte)ti.TileDataBufferStream.ReadByte();
if ((b & 0x80) == 0x80)
{
poi.Name = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
poi.Name = null;
}
if ((b & 0x40) == 0x40)
{
poi.HouseNumber = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
poi.HouseNumber = null;
}
if ((b & 0x20) == 0x20)
{
poi.Elevation = MapFile.ReadVBESint(ti.TileDataBufferStream);
}
else
{
poi.Elevation = null;
}
ti.POIs.Add(poi);
}
ti.TileDataBufferStream.Position = ti.FirstWayOffset;
//get ways
for (int w = 0; w < ti.WaysOnQueryZoomLevel; w++)
{
Way way = new Way();
if (_mapFile.Header.DebugInformationPresent)
{
ti.TileDataBufferStream.Position += 32;
}
int wayDataSize = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
int subTileBitmap = MapFile.ReadUInt16(ti.TileDataBufferStream);
if (ti.UseSubTileBitmapMask)
{
// check if the way is inside the requested tile
if ((ti.SubTileBitmapMask & subTileBitmap) == 0)
{
// skip the rest of the way and continue with the next way
ti.TileDataBufferStream.Position += (wayDataSize - 2);
continue;
}
}
//layer and tags
way.TagIDs = new List <int>();
byte b = (byte)ti.TileDataBufferStream.ReadByte();
way.Layer = b >> 4;
int tagCount = (b & 0x0F);
for (int t = 0; t < tagCount; t++)
{
way.TagIDs.Add((int)MapFile.ReadVBEUint(ti.TileDataBufferStream));
}
//feature bytes
b = (byte)ti.TileDataBufferStream.ReadByte();
if ((b & 0x80) == 0x80)
{
way.Name = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
way.Name = null;
}
if ((b & 0x40) == 0x40)
{
way.HouseNumber = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
way.HouseNumber = null;
}
if ((b & 0x20) == 0x20)
{
way.Reference = MapFile.ReadUTF8EncodedString(ti.TileDataBufferStream);
}
else
{
way.Reference = null;
}
if ((b & 0x10) == 0x10)
{
way.LabelLatitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
way.LabelLongitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
}
else
{
way.LabelLatitude = null;
way.LabelLongitude = null;
}
int numberOfBlocks;
if ((b & 0x08) == 0x08)
{
numberOfBlocks = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
}
else
{
numberOfBlocks = 1;
}
bool doubleEncoding = ((b & 0x04) == 0x04);
way.WayDataBlocks = new List <Way.WayData>();
for (int wb = 0; wb < numberOfBlocks; wb++)
{
//read: way data
Way.WayData wd = new Way.WayData();
int numberOfWayCoordBlocks = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
wd.DataBlock = new List <Way.WayCoordinateBlock>();
for (int wcd = 0; wcd < numberOfWayCoordBlocks; wcd++)
{
//read way coordinate block
Way.WayCoordinateBlock coordBlock = new Way.WayCoordinateBlock();
coordBlock.CoordBlock = new List <Way.WayCoordinate>();
int nodesCount = (int)MapFile.ReadVBEUint(ti.TileDataBufferStream);
//Way.WayCoordinate diffwc = wc;
if (doubleEncoding)
{
// get the first way node latitude single-delta offset (VBE-S)
int wayNodeLatitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the first way node longitude single-delta offset (VBE-S)
int wayNodeLongitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// store the first way node
Way.WayCoordinate wc = new Way.WayCoordinate();
wc.Latitude = wayNodeLatitude;
wc.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wc);
int previousSingleDeltaLatitude = 0;
int previousSingleDeltaLongitude = 0;
for (int n = 1; n < nodesCount; n++)
{
// get the way node latitude double-delta offset (VBE-S)
int doubleDeltaLatitude = MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the way node longitude double-delta offset (VBE-S)
int doubleDeltaLongitude = MapFile.ReadVBESint(ti.TileDataBufferStream);
int singleDeltaLatitude = doubleDeltaLatitude + previousSingleDeltaLatitude;
int singleDeltaLongitude = doubleDeltaLongitude + previousSingleDeltaLongitude;
wayNodeLatitude = wayNodeLatitude + singleDeltaLatitude;
wayNodeLongitude = wayNodeLongitude + singleDeltaLongitude;
Way.WayCoordinate wcNext = new Way.WayCoordinate();
wcNext.Latitude = wayNodeLatitude;
wcNext.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wcNext);
previousSingleDeltaLatitude = singleDeltaLatitude;
previousSingleDeltaLongitude = singleDeltaLongitude;
}
}
else
{
// get the first way node latitude single-delta offset (VBE-S)
int wayNodeLatitude = ti.TileLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the first way node longitude single-delta offset (VBE-S)
int wayNodeLongitude = ti.TileLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// store the first way node
Way.WayCoordinate wc = new Way.WayCoordinate();
wc.Latitude = wayNodeLatitude;
wc.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wc);
for (int n = 1; n < nodesCount; n++)
{
// get the way node latitude offset (VBE-S)
wayNodeLatitude = wayNodeLatitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
// get the way node longitude offset (VBE-S)
wayNodeLongitude = wayNodeLongitude + MapFile.ReadVBESint(ti.TileDataBufferStream);
Way.WayCoordinate wcNext = new Way.WayCoordinate();
wcNext.Latitude = wayNodeLatitude;
wcNext.Longitude = wayNodeLongitude;
coordBlock.CoordBlock.Add(wcNext);
}
}
wd.DataBlock.Add(coordBlock);
}
way.WayDataBlocks.Add(wd);
}
ti.Ways.Add(way);
}
}
}
}
ti.TileDataBuffer = null; //memory can be released
}
catch
{
ti = null;
}
return(ti);
}