private GeoPointList decodeWayNodesDoubleDelta(int numberOfWayNodes)
{
GeoPointList waySegment = new GeoPointList(numberOfWayNodes);
// get the first way node latitude offset (VBE-S)
double wayNodeLatitude = this.tilePosition.Latitude
+ CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
// get the first way node longitude offset (VBE-S)
double wayNodeLongitude = this.tilePosition.Longitude
+ CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
if (wayNodeLatitude > 90)
{
wayNodeLatitude = 90;
}
if (wayNodeLatitude < -90)
{
wayNodeLatitude = -90;
}
// store the first way node
waySegment.Add(new GeoPoint(wayNodeLatitude, wayNodeLongitude));
double previousSingleDeltaLatitude = 0;
double previousSingleDeltaLongitude = 0;
for (int wayNodesIndex = 1; wayNodesIndex < numberOfWayNodes; ++wayNodesIndex)
{
// get the way node latitude double-delta offset (VBE-S)
double doubleDeltaLatitude = CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
// get the way node longitude double-delta offset (VBE-S)
double doubleDeltaLongitude = CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
double singleDeltaLatitude = doubleDeltaLatitude + previousSingleDeltaLatitude;
double singleDeltaLongitude = doubleDeltaLongitude + previousSingleDeltaLongitude;
wayNodeLatitude = wayNodeLatitude + singleDeltaLatitude;
wayNodeLongitude = wayNodeLongitude + singleDeltaLongitude;
if (wayNodeLatitude > 90)
{
wayNodeLatitude = 90;
}
if (wayNodeLatitude < -90)
{
wayNodeLatitude = -90;
}
waySegment.Add(new GeoPoint(wayNodeLatitude, wayNodeLongitude));
previousSingleDeltaLatitude = singleDeltaLatitude;
previousSingleDeltaLongitude = singleDeltaLongitude;
}
return(waySegment);
}
private void ReadMapStartPosition(BufferStream readBuffer)
{
if (this.hasStartPosition)
{
double mapStartLatitude = CoordinatesUtil.microdegreesToDegrees(readBuffer.ReadInt());
double mapStartLongitude = CoordinatesUtil.microdegreesToDegrees(readBuffer.ReadInt());
try {
this.startPosition = new GeoPoint(mapStartLatitude, mapStartLongitude);
} catch (ArgumentException e) {
throw new System.IO.InvalidDataException(e.Message);
}
}
}
public static void ReadBoundingBox(BufferStream readBuffer, MapFileInfoBuilder mapFileInfoBuilder)
{
double minLatitude = CoordinatesUtil.microdegreesToDegrees(readBuffer.ReadInt());
double minLongitude = CoordinatesUtil.microdegreesToDegrees(readBuffer.ReadInt());
double maxLatitude = CoordinatesUtil.microdegreesToDegrees(readBuffer.ReadInt());
double maxLongitude = CoordinatesUtil.microdegreesToDegrees(readBuffer.ReadInt());
try {
mapFileInfoBuilder.boundingBox = new BoundingBox(minLatitude, minLongitude, maxLatitude, maxLongitude);
} catch (ArgumentException e) {
throw new System.IO.InvalidDataException(e.Message, e);
}
}
private GeoPoint readOptionalLabelPosition(bool featureLabelPosition)
{
if (featureLabelPosition)
{
// get the label position latitude offset (VBE-S)
double latitude = this.tilePosition.Latitude
+ CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
// get the label position longitude offset (VBE-S)
double longitude = this.tilePosition.Longitude
+ CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
return(new GeoPoint(latitude, longitude));
}
return(null);
}
private List <Node> processNodes(int numberOfNodes)
{
List <Node> nodes = new List <Node>();
Tag[] NODETags = this.mapFileHeader.MapFileInfo.NodeTags;
for (int elementCounter = numberOfNodes; elementCounter != 0; --elementCounter)
{
if (this.mapFileHeader.MapFileInfo.DebugFile)
{
// get and check the NODE signature
this.signatureNode = this.readBuffer.ReadUTF8Encodedstring(SIGNATURE_LENGTH_NODE);
if (!this.signatureNode.StartsWith("***nodestart"))
{
System.Diagnostics.Debug.WriteLine("invalid NODE signature: " + this.signatureNode);
System.Diagnostics.Debug.WriteLine(DEBUG_SIGNATURE_BLOCK + this.signatureBlock);
return(null);
}
}
// get the NODE latitude offset (VBE-S)
double latitude = this.tilePosition.Latitude
+ CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
// get the NODE longitude offset (VBE-S)
double longitude = this.tilePosition.Longitude
+ CoordinatesUtil.microdegreesToDegrees(this.readBuffer.ReadSignedInt());
// get the special byte which encodes multiple flags
byte specialbyte = (byte)this.readBuffer.ReadByte();
// bit 1-4 represent the layer
byte layer = (byte)((specialbyte & NODE_LAYER_BITMASK) >> NODE_LAYER_SHIFT);
// bit 5-8 represent the number of tag IDs
byte numberOfTags = (byte)(specialbyte & NODE_NUMBER_OF_TAGS_BITMASK);
List <Tag> tags = new List <Tag>();
// get the tag IDs (VBE-U)
for (byte tagIndex = numberOfTags; tagIndex != 0; --tagIndex)
{
int tagId = this.readBuffer.ReadUnsignedInt();
if (tagId < 0 || tagId >= NODETags.Length)
{
System.Diagnostics.Debug.WriteLine("invalid node tag ID: " + tagId);
if (this.mapFileHeader.MapFileInfo.DebugFile)
{
System.Diagnostics.Debug.WriteLine(DEBUG_SIGNATURE_NODE + this.signatureNode);
System.Diagnostics.Debug.WriteLine(DEBUG_SIGNATURE_BLOCK + this.signatureBlock);
}
return(null);
}
tags.Add(NODETags[tagId]);
}
// get the feature bitmask (1 byte)
byte featurebyte = (byte)this.readBuffer.ReadByte();
// bit 1-3 enable optional features
bool featureName = (featurebyte & NODE_FEATURE_NAME) != 0;
bool featureHouseNumber = (featurebyte & NODE_FEATURE_HOUSE_NUMBER) != 0;
bool featureElevation = (featurebyte & NODE_FEATURE_ELEVATION) != 0;
// check if the NODE has a name
if (featureName)
{
tags.Add(new Tag(TAG_KEY_NAME, this.readBuffer.ReadUTF8Encodedstring()));
}
// check if the NODE has a house number
if (featureHouseNumber)
{
tags.Add(new Tag(TAG_KEY_HOUSE_NUMBER, this.readBuffer.ReadUTF8Encodedstring()));
}
// check if the NODE has an elevation
if (featureElevation)
{
tags.Add(new Tag(TAG_KEY_ELE, this.readBuffer.ReadSignedInt().ToString()));
}
if (latitude < 90 && latitude > -90)
{
nodes.Add(new Node(layer, tags, new GeoPoint(latitude, longitude)));
}
}
return(nodes);
}