public void RegionCoverageTest_Precision_6_7_8()
{
var area = new NarrowcastArea
{
BeginTimestamp = 0,
EndTimestamp = 1,
RadiusMeters = 1000,
};
{
area.Location = new Coordinates {
Latitude = 40.99999, Longitude = -73.999999
};
var regions = RegionHelper.GetRegionsCoverage(area, 8).ToList();
Assert.AreEqual(4, regions.Count);
}
{
area.Location = new Coordinates {
Latitude = 40.99999, Longitude = -73.999999
};
var regions = RegionHelper.GetRegionsCoverage(area, 7).ToList();
Assert.AreEqual(2, regions.Count);
}
{
area.Location = new Coordinates {
Latitude = 40.99999, Longitude = -73.999999
};
var regions = RegionHelper.GetRegionsCoverage(area, 6).ToList();
Assert.AreEqual(1, regions.Count);
}
}
public void RegionCoverageTest_Precision1()
{
var area = new NarrowcastArea
{
BeginTimestamp = 0,
EndTimestamp = 1,
RadiusMeters = 1000,
};
int precision = 1;
{
area.Location = new Coordinates {
Latitude = 0.0001, Longitude = 0.0001
};
var regions = RegionHelper.GetRegionsCoverage(area, precision).ToList();
Assert.AreEqual(1, regions.Count);
}
{
area.Location = new Coordinates {
Latitude = 89.99999, Longitude = 0.0001
};
var regions = RegionHelper.GetRegionsCoverage(area, precision).ToList();
Assert.AreEqual(2, regions.Count);
}
{
area.Location = new Coordinates {
Latitude = -0.0001, Longitude = 179.99999
};
var regions = RegionHelper.GetRegionsCoverage(area, precision).ToList();
Assert.AreEqual(2, regions.Count);
}
{
area.Location = new Coordinates {
Latitude = -89.9999, Longitude = 0.0001
};
var regions = RegionHelper.GetRegionsCoverage(area, precision).ToList();
Assert.AreEqual(2, regions.Count);
}
{
area.Location = new Coordinates {
Latitude = -0.0001, Longitude = -179.99999
};
var regions = RegionHelper.GetRegionsCoverage(area, precision).ToList();
Assert.AreEqual(2, regions.Count);
}
{
area.Location = new Coordinates {
Latitude = 89.99999, Longitude = -179.99999
};
var regions = RegionHelper.GetRegionsCoverage(area, precision).ToList();
Assert.AreEqual(3, regions.Count);
}
}
/// <summary>
/// Enumerates all <see cref="Region"/>s of given precision covering given areas/>
/// </summary>
/// <param name="area"><see cref="NarrowcastArea"/>s</param>
/// <param name="precisionStart">Minimal precision. Any integer number</param>
/// <param name="precisionEnd">Maximal precision. Any integer number larger than precisionStart</param>
/// <returns>Collection of <see cref="Region"/>s</returns>
public static IEnumerable <Region> GetRegionsCoverage(NarrowcastArea area, int precisionStart, int precisionEnd)
{
var result = new List <Region>();
for (int p = precisionStart; p <= precisionEnd; ++p)
{
result.AddRange(GetRegionsCoverage(area, p));
}
return(result);
}
/// <summary>
/// Enumerates all <see cref="Region"/>s of given precision covering given area/>
/// Current implementation only returns single region associated with area center.
/// Under assumption of radius of area to be significantly below precision resolution and usage of extension >= 1 in search,
/// that is enough
/// </summary>
/// <param name="area"><see cref="NarrowcastArea"/></param>
/// <param name="precision">Precision. Any integer number</param>
/// <returns>Collection of <see cref="Region"/>s</returns>
public static IEnumerable <Region> GetRegionsCoverage(NarrowcastArea area, int precision)
{
double latAbs = Math.Abs(area.Location.Latitude);
double lonAbs = Math.Abs(area.Location.Longitude);
int latSign = Math.Sign(area.Location.Latitude);
int lonSign = Math.Sign(area.Location.Longitude);
// Get connected regions from first quadrant
var regionsPositive = GetRegionCoveragePositive(new Coordinates {
Latitude = latAbs, Longitude = lonAbs
}, area.RadiusMeters, precision);
//returning them back to original quadrants
foreach (var region in regionsPositive)
{
region.LatitudePrefix *= latSign;
region.LongitudePrefix *= lonSign;
yield return(region);
}
}
