/// <summary>
/// Loads a vertex and returns true if found.
/// </summary>
/// <param name="vertexId"></param>
/// <param name="latitude"></param>
/// <param name="longitude"></param>
/// <returns></returns>
private bool LoadVertex(uint vertexId, out float latitude, out float longitude)
{
uint blockId = CHBlock.CalculateId(vertexId, _blockSize);
CHBlock block;
if (!_blocks.TryGet(blockId, out block))
{ // damn block not cached!
block = this.DeserializeBlock(blockId);
if (block == null)
{ // oops even now the block is not found!
longitude = 0;
latitude = 0;
return(false);
}
_blocks.Add(blockId, block);
}
uint blockIdx = vertexId - blockId;
if (block.Vertices != null &&
blockIdx < block.Vertices.Length)
{ // block is found and the vertex is there!
latitude = block.Vertices[blockIdx].Latitude;
longitude = block.Vertices[blockIdx].Longitude;
return(true);
}
// oops even now the block is not found!
longitude = 0;
latitude = 0;
return(false);
}
/// <summary>
/// Loads all arcs but no shapes associated with the given vertex.
/// </summary>
/// <param name="vertexId"></param>
/// <returns></returns>
private KeyValuePair <uint, CHEdgeData>[] LoadArcsNoShapes(uint vertexId)
{
uint blockId = CHBlock.CalculateId(vertexId, _blockSize);
CHBlock block;
if (!_blocks.TryGet(blockId, out block))
{ // damn block not cached!
block = this.DeserializeBlock(blockId);
if (block == null)
{ // oops even now the block is not found!
return(new KeyValuePair <uint, CHEdgeData> [0]);
}
_blocks.Add(blockId, block);
}
uint blockIdx = vertexId - blockId;
if (block.Vertices != null &&
blockIdx < block.Vertices.Length)
{ // block is found and the vertex is there!
var arcs = new KeyValuePair <uint, CHEdgeData> [
block.Vertices[blockIdx].ArcCount];
for (int arcIdx = block.Vertices[blockIdx].ArcIndex;
arcIdx < block.Vertices[blockIdx].ArcIndex + block.Vertices[blockIdx].ArcCount; arcIdx++)
{ // loop over all arcs.
var chArc = block.Arcs[arcIdx];
var edgeData = new CHEdgeData(chArc.Value, chArc.Weight, chArc.Meta);
arcs[arcIdx - block.Vertices[blockIdx].ArcIndex] = new KeyValuePair <uint, CHEdgeData>(
chArc.TargetId, edgeData);
}
return(arcs);
}
// oops even now the block is not found!
return(new KeyValuePair <uint, CHEdgeData> [0]);
}
/// <summary>
/// Loads the edge between the given vertices.
/// </summary>
/// <param name="vertex1"></param>
/// <param name="vertex2"></param>
/// <param name="data"></param>
/// <returns></returns>
private bool LoadArc(uint vertex1, uint vertex2, out CHEdgeData data)
{
uint blockId = CHBlock.CalculateId(vertex1, _blockSize);
CHBlock block;
if (!_blocks.TryGet(blockId, out block))
{ // damn block not cached!
block = this.DeserializeBlock(blockId);
if (block == null)
{ // oops even now the block is not found!
data = new CHEdgeData();
return(false);
}
_blocks.Add(blockId, block);
}
uint blockIdx = vertex1 - blockId;
if (block.Vertices != null &&
blockIdx < block.Vertices.Length)
{ // block is found and the vertex is there!
for (int arcIdx = block.Vertices[blockIdx].ArcIndex;
arcIdx < block.Vertices[blockIdx].ArcIndex + block.Vertices[blockIdx].ArcCount; arcIdx++)
{ // loop over all arcs.
var chArc = block.Arcs[arcIdx];
if (chArc.TargetId == vertex2)
{
data = new CHEdgeData(chArc.Value, chArc.Weight, chArc.Meta);
return(true);
}
}
}
blockId = CHBlock.CalculateId(vertex2, _blockSize);
if (!_blocks.TryGet(blockId, out block))
{ // damn block not cached!
block = this.DeserializeBlock(blockId);
if (block == null)
{ // oops even now the block is not found!
data = new CHEdgeData();
return(false);
}
_blocks.Add(blockId, block);
}
blockIdx = vertex2 - blockId;
if (block.Vertices != null &&
blockIdx < block.Vertices.Length)
{ // block is found and the vertex is there!
for (int arcIdx = block.Vertices[blockIdx].ArcIndex;
arcIdx < block.Vertices[blockIdx].ArcIndex + block.Vertices[blockIdx].ArcCount; arcIdx++)
{ // loop over all arcs.
var chArc = block.Arcs[arcIdx];
if (chArc.TargetId == vertex1)
{
data = new CHEdgeData(chArc.Value, chArc.Weight, chArc.Meta);
return(true);
}
}
}
data = new CHEdgeData();
return(false);
}
/// <summary>
/// Deserializes the given block of data.
/// </summary>
/// <param name="stream"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <param name="decompress"></param>
/// <returns></returns>
internal CHBlock DeserializeBlock(Stream stream, long offset, int length, bool decompress)
{
CHBlock value = null;
if (decompress)
{ // decompress the data.
var buffer = new byte[length];
stream.Seek(offset, SeekOrigin.Begin);
stream.Read(buffer, 0, length);
var memoryStream = new MemoryStream(buffer);
var gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress);
value = (CHBlock)_runtimeTypeModel.Deserialize(gZipStream, null, typeof(CHBlock));
}
else
{
value = (CHBlock)_runtimeTypeModel.Deserialize(
new CappedStream(stream, offset, length), null,
typeof(CHBlock));
}
return(value);
}
/// <summary>
/// Loads the reverses for the given vertex.
/// </summary>
/// <param name="vertex"></param>
/// <returns></returns>
private uint[] LoadVertexReverses(uint vertex)
{
uint blockId = CHBlock.CalculateId(vertex, _blockSize);
CHBlockReverse blockReverses;
if (!_blockReverses.TryGet(blockId, out blockReverses))
{ // damn block not cached!
blockReverses = this.DeserializeReverse(blockId);
if (blockReverses == null)
{ // oops even now the block is not found!
return(new uint[0]);
}
_blockReverses.Add(blockId, blockReverses);
uint blockIdx = vertex - blockId;
var vertices = blockReverses.Vertices[blockIdx].Neighbours;
if (vertices != null)
{
return(vertices);
}
}
return(new uint[0]);
}
/// <summary>
/// Does the v2 serialization.
/// </summary>
/// <param name="stream"></param>
/// <param name="graph"></param>
/// <returns></returns>
protected override void DoSerialize(LimitedStream stream,
DynamicGraphRouterDataSource <CHEdgeData> graph)
{
// sort the graph.
IDynamicGraph <CHEdgeData> sortedGraph = CHEdgeDataDataSourceSerializer.SortGraph(graph);
// create the regions.
SortedDictionary <ulong, List <uint> > regions = new SortedDictionary <ulong, List <uint> >();
for (uint newVertexId = 1; newVertexId < sortedGraph.VertexCount + 1; newVertexId++)
{
// add to the CHRegions.
float latitude, longitude;
sortedGraph.GetVertex(newVertexId, out latitude, out longitude);
Tile tile = Tile.CreateAroundLocation(new GeoCoordinate(
latitude, longitude), RegionZoom);
List <uint> regionVertices;
if (!regions.TryGetValue(tile.Id, out regionVertices))
{
regionVertices = new List <uint>();
regions.Add(tile.Id, regionVertices);
}
regionVertices.Add(newVertexId);
}
// serialize the sorted graph.
// [START_OF_BLOCKS][[SIZE_OF_REGION_INDEX][REGION_INDEX][REGIONS]][[SIZE_OF_BLOCK_INDEX][BLOCK_INDEX][BLOCKS]]
// STRART_OF_BLOCKS: 4bytes
// SIZE_OF_REGION_INDEX: 4bytes
// REGION_INDEX: see SIZE_OF_REGION_INDEX
// REGIONS: see START_OF_BLOCKS - 4bytes
// SIZE_OF_BLOCK_INDEX: 4bytes
// BLOCK_INDEX: see SIZE_OF_BLOCK_INDEX.
// BLOCKS: from START_OF_BLOCKS + 4bytes + SIZE_OF_BLOCKS_INDEX until END.
// serialize regions and build their index.
CHVertexRegionIndex chRegionIndex = new CHVertexRegionIndex();
chRegionIndex.LocationIndex = new int[regions.Count];
chRegionIndex.RegionIds = new ulong[regions.Count];
var memoryStream = new MemoryStream();
int regionIdx = 0;
foreach (KeyValuePair <ulong, List <uint> > region in regions)
{
// serialize.
CHVertexRegion chRegion = new CHVertexRegion();
chRegion.Vertices = region.Value.ToArray();
_runtimeTypeModel.Serialize(memoryStream, chRegion);
// set index.
chRegionIndex.LocationIndex[regionIdx] = (int)memoryStream.Position;
chRegionIndex.RegionIds[regionIdx] = region.Key;
regionIdx++;
}
stream.Seek(8, SeekOrigin.Begin); // move to beginning of [REGION_INDEX]
_runtimeTypeModel.Serialize(stream, chRegionIndex); // write region index.
int sizeRegionIndex = (int)(stream.Position - 8); // now at beginning of [REGIONS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write regions.
memoryStream.Dispose();
int startOfBlocks = (int)stream.Position; // now at beginning of [SIZE_OF_BLOCK_INDEX]
stream.Seek(0, SeekOrigin.Begin); // move to beginning
stream.Write(BitConverter.GetBytes(startOfBlocks), 0, 4); // write start position of blocks. Now at [SIZE_OF_REGION_INDEX]
stream.Write(BitConverter.GetBytes(sizeRegionIndex), 0, 4); // write size of blocks index.
// serialize the blocks and build their index.
memoryStream = new MemoryStream();
List <int> blockLocations = new List <int>();
uint vertexId = 1;
while (vertexId < sortedGraph.VertexCount)
{
uint blockId = vertexId;
List <CHArc> blockArcs = new List <CHArc>();
List <CHVertex> blockVertices = new List <CHVertex>();
while (vertexId < blockId + BlockVertexSize &&
vertexId < sortedGraph.VertexCount + 1)
{ // create this block.
CHVertex chVertex = new CHVertex();
float latitude, longitude;
sortedGraph.GetVertex(vertexId, out latitude, out longitude);
chVertex.Latitude = latitude;
chVertex.Longitude = longitude;
chVertex.ArcIndex = (ushort)(blockArcs.Count);
foreach (KeyValuePair <uint, CHEdgeData> sortedArc in sortedGraph.GetArcs(vertexId))
{
CHArc chArc = new CHArc();
chArc.TargetId = sortedArc.Key;
chArc.ShortcutId = sortedArc.Value.ContractedVertexId;
chArc.Weight = sortedArc.Value.Weight;
chArc.Direction = sortedArc.Value.Direction;
blockArcs.Add(chArc);
}
chVertex.ArcCount = (ushort)(blockArcs.Count - chVertex.ArcIndex);
blockVertices.Add(chVertex);
vertexId++; // move to the next vertex.
}
// create block.
CHBlock block = new CHBlock();
block.Arcs = blockArcs.ToArray();
block.Vertices = blockVertices.ToArray(); // TODO: get rid of the list and create an array to begin with.
// write blocks.
_runtimeTypeModel.Serialize(memoryStream, block);
blockLocations.Add((int)memoryStream.Position);
}
CHBlockIndex blockIndex = new CHBlockIndex();
blockIndex.LocationIndex = blockLocations.ToArray();
stream.Seek(startOfBlocks + 4, SeekOrigin.Begin); // move to beginning of [BLOCK_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write region index.
int sizeBlockIndex = (int)(stream.Position - (startOfBlocks + 4)); // now at beginning of [BLOCKS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write blocks.
memoryStream.Dispose();
stream.Seek(startOfBlocks, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeBlockIndex), 0, 4); // write start position of blocks. Now at [SIZE_OF_REGION_INDEX]
stream.Flush();
}
/// <summary>
/// Does the v2 serialization.
/// </summary>
/// <param name="stream"></param>
/// <param name="graph"></param>
/// <returns></returns>
protected override void DoSerialize(LimitedStream stream,
DynamicGraphRouterDataSource <CHEdgeData> graph)
{
// sort the graph.
var sortedGraph = graph;
// create the regions.
var regions = new SortedDictionary <ulong, List <uint> >();
for (uint newVertexId = 1; newVertexId < sortedGraph.VertexCount + 1; newVertexId++)
{
// add to the CHRegions.
float latitude, longitude;
sortedGraph.GetVertex(newVertexId, out latitude, out longitude);
var tile = Tile.CreateAroundLocation(new GeoCoordinate(
latitude, longitude), _regionZoom);
List <uint> regionVertices;
if (!regions.TryGetValue(tile.Id, out regionVertices))
{
regionVertices = new List <uint>();
regions.Add(tile.Id, regionVertices);
}
regionVertices.Add(newVertexId);
}
// serialize the sorted graph.
// [START_OF_BLOCKS][START_OF_SHAPES][START_OF_REVERSE][START_OF_TAGS][[SIZE_OF_REGION_INDEX][REGION_INDEX][REGIONS]]
// [[SIZE_OF_BLOCK_INDEX][BLOCK_INDEX][BLOCKS]]
// [[SIZE_OF_SHAPE_INDEX][SHAPE_INDEX][SHAPES]]
// [[SIZE_OF_REVERSE_INDEX][REVERSE_INDEX][REVERSE]]
// [TAGS]
// START_OF_BLOCKS: 4bytes
// START_OF_SHAPES: 4bytes
// START_OF_STAGS: 4bytes
// START_OF_REVERSE 4bytes
// SIZE_OF_REGION_INDEX: 4bytes
// REGION_INDEX: see SIZE_OF_REGION_INDEX
// REGIONS: see START_OF_BLOCKS - 4bytes
// SIZE_OF_BLOCK_INDEX: 4bytes
// BLOCK_INDEX: see SIZE_OF_BLOCK_INDEX.
// BLOCKS: from START_OF_BLOCKS + 4bytes + SIZE_OF_BLOCKS_INDEX until END.
// serialize regions and build their index.
var chRegionIndex = new CHVertexRegionIndex();
chRegionIndex.LocationIndex = new int[regions.Count];
chRegionIndex.RegionIds = new ulong[regions.Count];
var memoryStream = new MemoryStream();
int regionIdx = 0;
foreach (var region in regions)
{
// serialize.
var chRegion = new CHVertexRegion();
chRegion.Vertices = region.Value.ToArray();
_runtimeTypeModel.Serialize(memoryStream, chRegion);
// set index.
chRegionIndex.LocationIndex[regionIdx] = (int)memoryStream.Position;
chRegionIndex.RegionIds[regionIdx] = region.Key;
regionIdx++;
}
stream.Seek(INDEX_SIZE, SeekOrigin.Begin); // move to beginning of [REGION_INDEX]
_runtimeTypeModel.Serialize(stream, chRegionIndex); // write region index.
var sizeRegionIndex = (int)(stream.Position - INDEX_SIZE); // now at beginning of [REGIONS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write regions.
memoryStream.Dispose();
var startOfBlocks = (int)stream.Position; // now at beginning of [SIZE_OF_BLOCK_INDEX]
// serialize the blocks and build their index.
memoryStream = new MemoryStream();
var blocks = new List <CHBlock>();
var blockLocations = new List <int>();
var blockShapeLocations = new List <int>();
var blockReverseLocations = new List <int>();
var blockShapes = new List <CHBlockCoordinates>();
var reverseNeighbours = new Dictionary <uint, List <uint> >();
uint vertexId = 1;
while (vertexId < sortedGraph.VertexCount + 1)
{
uint blockId = vertexId;
var blockArcs = new List <CHArc>();
var blockArcCoordinates = new List <CHArcCoordinates>();
var blockVertices = new List <CHVertex>();
while (vertexId < blockId + _blockVertexSize &&
vertexId < sortedGraph.VertexCount + 1)
{ // create this block.
var chVertex = new CHVertex();
float latitude, longitude;
sortedGraph.GetVertex(vertexId, out latitude, out longitude);
chVertex.Latitude = latitude;
chVertex.Longitude = longitude;
chVertex.ArcIndex = (ushort)(blockArcs.Count);
List <uint> reverse = null;
foreach (var sortedArc in sortedGraph.GetEdges(vertexId))
{
var chArc = new CHArc();
chArc.TargetId = sortedArc.Neighbour;
chArc.Meta = sortedArc.EdgeData.Meta;
chArc.Value = sortedArc.EdgeData.Value;
chArc.Weight = sortedArc.EdgeData.Weight;
blockArcs.Add(chArc);
var chArcCoordinates = new CHArcCoordinates();
chArcCoordinates.Coordinates = sortedArc.Intermediates.ToSimpleArray();
blockArcCoordinates.Add(chArcCoordinates);
if (sortedArc.EdgeData.RepresentsNeighbourRelations)
{
if (!reverseNeighbours.TryGetValue(sortedArc.Neighbour, out reverse))
{
reverse = new List <uint>();
reverseNeighbours[sortedArc.Neighbour] = reverse;
}
reverse.Add(vertexId);
}
}
chVertex.ArcCount = (ushort)(blockArcs.Count - chVertex.ArcIndex);
blockVertices.Add(chVertex);
vertexId++; // move to the next vertex.
}
// create block.
var block = new CHBlock();
block.Arcs = blockArcs.ToArray();
block.Vertices = blockVertices.ToArray(); // TODO: get rid of the list and create an array to begin with.
blocks.Add(block);
var blockCoordinates = new CHBlockCoordinates();
blockCoordinates.Arcs = blockArcCoordinates.ToArray();
// write blocks.
var blockStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockStream, block);
var compressed = GZipStream.CompressBuffer(blockStream.ToArray());
blockStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockLocations.Add((int)memoryStream.Position);
blockShapes.Add(blockCoordinates);
}
var blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockLocations.ToArray();
stream.Seek(startOfBlocks + 4, SeekOrigin.Begin); // move to beginning of [BLOCK_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write block index.
int sizeBlockIndex = (int)(stream.Position - (startOfBlocks + 4)); // now at beginning of [BLOCKS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write blocks.
memoryStream.Dispose();
// write shapes and index.
memoryStream = new MemoryStream();
var startOfShapes = stream.Position;
foreach (var blockCoordinates in blockShapes)
{
// write shape blocks.
var blockShapeStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockShapeStream, blockCoordinates);
var compressed = GZipStream.CompressBuffer(blockShapeStream.ToArray());
blockShapeStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockShapeLocations.Add((int)memoryStream.Position);
}
blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockShapeLocations.ToArray();
stream.Seek(startOfShapes + 4, SeekOrigin.Begin); // move to beginning of [SHAPE_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write shape index.
int sizeShapeIndex = (int)(stream.Position - (startOfShapes + 4)); // now at beginning of [SHAPE]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write shapes.
memoryStream.Dispose();
// build reverse blocks.
var blockReverses = new List <CHBlockReverse>();
List <uint> storedReverses = null;
uint currentVertexId = 0;
for (int i = 0; i < blocks.Count; i++)
{
var blockReverse = new CHBlockReverse();
blockReverse.Vertices = new CHArcReverse[blocks[i].Vertices.Length];
for (int j = 0; j < blocks[i].Vertices.Length; j++)
{
currentVertexId++;
var blockReverseArc = new CHArcReverse();
blockReverseArc.Neighbours = new uint[0];
if (reverseNeighbours.TryGetValue(currentVertexId, out storedReverses))
{
blockReverseArc.Neighbours = storedReverses.ToArray();
}
blockReverse.Vertices[j] = blockReverseArc;
}
blockReverses.Add(blockReverse);
}
// write reverse and index.
memoryStream = new MemoryStream();
var startOfReverses = stream.Position;
foreach (var blockReverse in blockReverses)
{
// write reverse blocks.
var blockReverseStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockReverseStream, blockReverse);
var compressed = GZipStream.CompressBuffer(blockReverseStream.ToArray());
blockReverseStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockReverseLocations.Add((int)memoryStream.Position);
}
blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockReverseLocations.ToArray();
stream.Seek(startOfReverses + 4, SeekOrigin.Begin); // move to beginning of [REVERSE_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write reverse index.
int sizeReverseIndex = (int)(stream.Position - (startOfReverses + 4)); // now at beginning of [REVERSE]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write reverses.
memoryStream.Dispose();
// write tags after reverses.
int tagsPosition = (int)stream.Position;
TagIndexSerializer.SerializeBlocks(stream, graph.TagsIndex, 10);
stream.Seek(startOfBlocks, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeBlockIndex), 0, 4); // write start position of blocks.
stream.Seek(startOfShapes, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeShapeIndex), 0, 4); // write start position of blocks.
stream.Seek(startOfReverses, SeekOrigin.Begin); // move to [SIZE_OF_REVERSE_INDEX]
stream.Write(BitConverter.GetBytes(sizeReverseIndex), 0, 4); // write start position of blocks.
// write index.
stream.Seek(0, SeekOrigin.Begin); // move to beginning
stream.Write(BitConverter.GetBytes(startOfBlocks), 0, 4); // write start position of blocks.
stream.Write(BitConverter.GetBytes(startOfShapes), 0, 4); // write start position of shapes.
stream.Write(BitConverter.GetBytes(startOfReverses), 0, 4); // write start position of shapes.
stream.Write(BitConverter.GetBytes(tagsPosition), 0, 4);
stream.Write(BitConverter.GetBytes(sizeRegionIndex), 0, 4); // write size of region index.
stream.Flush();
}
/// <summary>
/// Loads the edge between the given vertices.
/// </summary>
/// <param name="vertex1"></param>
/// <param name="vertex2"></param>
/// <param name="shape"></param>
/// <returns></returns>
private bool LoadArcShape(uint vertex1, uint vertex2, out ICoordinateCollection shape)
{
uint blockId = CHBlock.CalculateId(vertex1, _blockSize);
CHBlockCoordinates blockCoordinates;
if (!_blockShapes.TryGet(blockId, out blockCoordinates))
{ // damn block not cached!
blockCoordinates = this.DeserializeShape(blockId);
if (blockCoordinates == null)
{ // oops even now the block is not found!
shape = null;
return(false);
}
_blockShapes.Add(blockId, blockCoordinates);
}
CHBlock block;
if (!_blocks.TryGet(blockId, out block))
{ // damn block not cached!
block = this.DeserializeBlock(blockId);
if (block == null)
{ // oops even now the block is not found!
shape = null;
return(false);
}
_blocks.Add(blockId, block);
}
uint blockIdx = vertex1 - blockId;
if (block.Vertices != null &&
blockIdx < block.Vertices.Length)
{ // block is found and the vertex is there!
for (int arcIdx = block.Vertices[blockIdx].ArcIndex;
arcIdx < block.Vertices[blockIdx].ArcIndex + block.Vertices[blockIdx].ArcCount; arcIdx++)
{ // loop over all arcs.
var chArc = block.Arcs[arcIdx];
if (chArc.TargetId == vertex2)
{
var arcCoordinates = blockCoordinates.Arcs[arcIdx];
shape = null;
if (arcCoordinates.Coordinates != null)
{
shape = new CoordinateArrayCollection <GeoCoordinateSimple>(arcCoordinates.Coordinates);
}
return(true);
}
}
}
blockId = CHBlock.CalculateId(vertex2, _blockSize);
if (!_blocks.TryGet(blockId, out block))
{ // damn block not cached!
block = this.DeserializeBlock(blockId);
if (block == null)
{ // oops even now the block is not found!
shape = null;
return(false);
}
_blocks.Add(blockId, block);
}
if (!_blockShapes.TryGet(blockId, out blockCoordinates))
{ // damn block not cached!
blockCoordinates = this.DeserializeShape(blockId);
if (blockCoordinates == null)
{ // oops even now the block is not found!
shape = null;
return(false);
}
_blockShapes.Add(blockId, blockCoordinates);
}
blockIdx = vertex2 - blockId;
if (block.Vertices != null &&
blockIdx < block.Vertices.Length)
{ // block is found and the vertex is there!
for (int arcIdx = block.Vertices[blockIdx].ArcIndex;
arcIdx < block.Vertices[blockIdx].ArcIndex + block.Vertices[blockIdx].ArcCount; arcIdx++)
{ // loop over all arcs.
var chArc = block.Arcs[arcIdx];
if (chArc.TargetId == vertex1)
{
var arcCoordinates = blockCoordinates.Arcs[arcIdx];
shape = null;
if (arcCoordinates.Coordinates != null)
{
shape = new CoordinateArrayCollection <GeoCoordinateSimple>(arcCoordinates.Coordinates);
}
return(true);
}
}
}
shape = null;
return(false);
}
