public Encoder(int precision, ThirdDimension thirdDimension, int thirdDimPrecision)
{
_latConverter = new Converter(precision);
_lngConverter = new Converter(precision);
_zConverter = new Converter(thirdDimPrecision);
_thirdDimension = thirdDimension;
_result = new StringBuilder();
EncodeHeader(precision, (int)_thirdDimension, thirdDimPrecision);
}
private void DecodeHeader()
{
long header = 0;
DecodeHeaderFromString(_encoded, ref _index, ref header);
_precision = (int)(header & 0b_1111); // we pick the first 4 bits only
header >>= 4;
_thirdDimension = (ThirdDimension)(header & 0b_111); // we pick the first 3 bits only
_thirdDimPrecision = (int)((header >> 3) & 0b_1111);
}
public void TestInvalidThirdDimension()
{
var pairs = new List <LatLngZ>();
pairs.Add(new LatLngZ(50.1022829, 8.6982122));
ThirdDimension invalid = (ThirdDimension)999;
Assert.Throws <ArgumentException>(() =>
{
PolylineEncoderDecoder.Encode(pairs, 5, invalid, 0);
});
}
public void EncodedFlexilineMatchesDecodedResultTest()
{
using (var decodedEnumerator = File.ReadLines("../../../../../../test/round_half_up/decoded.txt").GetEnumerator())
{
foreach (var flexiline in File.ReadLines("../../../../../../test/round_half_up/encoded.txt"))
{
decodedEnumerator.MoveNext();
var testResultStr = decodedEnumerator.Current;
var expectedResult = ParseExpectedTestResult(testResultStr);
var decoded = PolylineEncoderDecoder.Decode(flexiline);
var encoded = PolylineEncoderDecoder.Encode(
decoded,
expectedResult.Precision.Precision2d,
expectedResult.Precision.Type3d,
expectedResult.Precision.Precision3d);
ThirdDimension thirdDimension = PolylineEncoderDecoder.GetThirdDimension(encoded);
Assert.AreEqual(expectedResult.Precision.Type3d, thirdDimension);
for (int i = 0; i < decoded.Count; i++)
{
AssertEqualWithPrecision(
expectedResult.Coordinates[i].Lat,
decoded[i].Lat,
expectedResult.Precision.Precision2d);
AssertEqualWithPrecision(
expectedResult.Coordinates[i].Lng,
decoded[i].Lng,
expectedResult.Precision.Precision2d);
AssertEqualWithPrecision(
expectedResult.Coordinates[i].Z,
decoded[i].Z,
expectedResult.Precision.Precision3d);
}
if (flexiline != encoded)
{
Console.WriteLine($@"WARNING expected {flexiline} but got {encoded}");
}
}
}
}
/// <summary>
/// Encode the list of coordinate triples.
/// The third dimension value will be eligible for encoding only when ThirdDimension is other than ABSENT.
/// This is lossy compression based on precision accuracy.
/// </summary>
/// <param name="coordinates">coordinates {@link List} of coordinate triples that to be encoded.</param>
/// <param name="precision">Floating point precision of the coordinate to be encoded.</param>
/// <param name="thirdDimension">{@link ThirdDimension} which may be a level, altitude, elevation or some other custom value</param>
/// <param name="thirdDimPrecision">Floating point precision for thirdDimension value</param>
/// <returns>URL-safe encoded {@link String} for the given coordinates.</returns>
public static string Encode(List <LatLngZ> coordinates, int precision, ThirdDimension thirdDimension, int thirdDimPrecision)
{
if (coordinates == null || coordinates.Count == 0)
{
throw new ArgumentException("Invalid coordinates!");
}
if (!Enum.IsDefined(typeof(ThirdDimension), thirdDimension))
{
throw new ArgumentException("Invalid thirdDimension");
//thirdDimension = ThirdDimension.Absent;
}
Encoder enc = new Encoder(precision, thirdDimension, thirdDimPrecision);
foreach (var coordinate in coordinates)
{
enc.Add(coordinate);
}
return(enc.GetEncoded());
}
public Precision(int precision2d, int precision3d = 0, ThirdDimension type3d = ThirdDimension.Absent)
{
Precision2d = precision2d;
Precision3d = precision3d;
Type3d = type3d;
}
