public void Test_GetLength_ThreePolylinesInOneShape()
{
// S2EdgeVectorShape is the only standard S2Shape that can have more than
// one edge chain of dimension 1.
var p = ParsePointsOrDie("0:0, 1:0, 2:0, 3:0");
S2EdgeVectorShape shape = new(new List <(S2Point, S2Point)> {
(p[0], p[1]), (p[0], p[2]), (p[0], p[3])
});
Assert.Equal(S1Angle.FromDegrees(6), S2.GetLength(shape));
}
// Returns the total length of all polylines in the index. Returns zero if no
// polylines are present.
//
// All edges are modeled as spherical geodesics. The result can be converted
// to a distance on the Earth's surface (with a worst-case error of 0.562%
// near the equator) using the functions in s2earth.h.
public static S1Angle GetLength(S2ShapeIndex index)
{
var length = S1Angle.Zero;
for (int i = 0; i < index.NumShapeIds(); ++i)
{
var shape = index.Shape(i);
if (shape != null)
{
length += S2.GetLength(shape);
}
}
return(length);
}
public void Test_GetLength_WrongDimension()
{
Assert.Equal(S1Angle.Zero, S2.GetLength(MakeIndexOrDie("0:0 # #").Shape(0)));
Assert.Equal(S1Angle.Zero,
S2.GetLength(MakeLaxPolygonOrDie("0:0, 0:1, 1:0")));
}