private void decodeWayNodesSingleDelta(List <Point> waySegment, double tileLatitude, double tileLongitude, ReadBuffer readBuffer) { // get the first way node latitude single-delta offset (VBE-S) double wayNodeLatitude = tileLatitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); // get the first way node longitude single-delta offset (VBE-S) double wayNodeLongitude = tileLongitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); // store the first way node waySegment.Add(new Point(wayNodeLongitude, wayNodeLatitude)); for (int wayNodesIndex = 1; wayNodesIndex < waySegment.Capacity; ++wayNodesIndex) { // get the way node latitude offset (VBE-S) wayNodeLatitude = wayNodeLatitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); // get the way node longitude offset (VBE-S) wayNodeLongitude = wayNodeLongitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); // Decoding near international date line can return values slightly outside valid [-180°, 180°] due to calculation precision if (wayNodeLongitude < PointUtils.LONGITUDE_MIN && (PointUtils.LONGITUDE_MIN - wayNodeLongitude) < 0.001) { wayNodeLongitude = PointUtils.LONGITUDE_MIN; } else if (wayNodeLongitude > PointUtils.LONGITUDE_MAX && (wayNodeLongitude - PointUtils.LONGITUDE_MAX) < 0.001) { wayNodeLongitude = PointUtils.LONGITUDE_MAX; } waySegment.Add(new Point(wayNodeLongitude, wayNodeLatitude)); } }
private Point ReadOptionalLabelPosition(double tileLatitude, double tileLongitude, bool featureLabelPosition, ReadBuffer readBuffer) { if (featureLabelPosition) { // get the label position latitude offset (VBE-S) double latitude = tileLatitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); // get the label position longitude offset (VBE-S) double longitude = tileLongitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); return(new Point(longitude, latitude)); } return(null); }
private IList <PointOfInterest> ProcessPOIs(double tileLatitude, double tileLongitude, int numberOfPois, BoundingBox boundingBox, bool filterRequired, ReadBuffer readBuffer) { IList <PointOfInterest> pois = new List <PointOfInterest>(); Tag[] poiTags = this.mapFileHeader.MapFileInfo.PoiTags; for (int elementCounter = numberOfPois; elementCounter != 0; --elementCounter) { if (this.mapFileHeader.MapFileInfo.DebugFile) { // get and check the POI signature string signaturePoi = readBuffer.ReadUTF8EncodedString(SIGNATURE_LENGTH_POI); if (!signaturePoi.StartsWith("***POIStart", StringComparison.Ordinal)) { Logger.Log(LogLevel.Warning, "invalid POI signature: " + signaturePoi); return(null); } } // get the POI latitude offset (VBE-S) double latitude = tileLatitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); // get the POI longitude offset (VBE-S) double longitude = tileLongitude + PointUtils.MicrodegreesToDegrees(readBuffer.ReadSignedInt()); // get the special byte which encodes multiple flags sbyte specialByte = readBuffer.ReadByte(); // bit 1-4 represent the layer with sbyte layer = (sbyte)((int)((uint)(specialByte & POI_LAYER_BITMASK) >> POI_LAYER_SHIFT)); // bit 5-8 represent the number of tag IDs sbyte numberOfTags = (sbyte)(specialByte & POI_NUMBER_OF_TAGS_BITMASK); IList <Tag> tags = new List <Tag>(); // get the tag IDs (VBE-U) for (sbyte tagIndex = numberOfTags; tagIndex != 0; --tagIndex) { int tagId = readBuffer.ReadUnsignedInt(); if (tagId < 0 || tagId >= poiTags.Length) { Logger.Log(LogLevel.Warning, "invalid POI tag ID: " + tagId); return(null); } tags.Add(poiTags[tagId]); } // get the feature bitmask (1 byte) sbyte featureByte = readBuffer.ReadByte(); // bit 1-3 enable optional features bool featureName = (featureByte & POI_FEATURE_NAME) != 0; bool featureHouseNumber = (featureByte & POI_FEATURE_HOUSE_NUMBER) != 0; bool featureElevation = (featureByte & POI_FEATURE_ELEVATION) != 0; // check if the POI has a name if (featureName) { tags.Add(new Tag(TAG_KEY_NAME, ExtractLocalized(readBuffer.ReadUTF8EncodedString()))); } // check if the POI has a house number if (featureHouseNumber) { tags.Add(new Tag(TAG_KEY_HOUSE_NUMBER, readBuffer.ReadUTF8EncodedString())); } // check if the POI has an elevation if (featureElevation) { tags.Add(new Tag(TAG_KEY_ELE, Convert.ToString(readBuffer.ReadSignedInt()))); } Point position = new Point(longitude, latitude); // depending on the zoom level configuration the poi can lie outside // the tile requested, we filter them out here if (!filterRequired || boundingBox.Contains(position)) { pois.Add(new PointOfInterest(layer, tags, position)); } } return(pois); }