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use num_traits::{Float, FromPrimitive};
use types::{Line, LineString, MultiLineString};
use algorithm::haversine_distance::HaversineDistance;
pub trait HaversineLength<T, RHS = Self> {
fn haversine_length(&self) -> T;
}
impl<T> HaversineLength<T> for Line<T>
where T: Float + FromPrimitive
{
fn haversine_length(&self) -> T {
self.start.haversine_distance(&self.end)
}
}
impl<T> HaversineLength<T> for LineString<T>
where T: Float + FromPrimitive
{
fn haversine_length(&self) -> T {
self.0.windows(2)
.fold(T::zero(), |total_length, p| total_length + p[0].haversine_distance(&p[1]))
}
}
impl<T> HaversineLength<T> for MultiLineString<T>
where T: Float + FromPrimitive
{
fn haversine_length(&self) -> T {
self.0.iter().fold(T::zero(), |total, line| total + line.haversine_length())
}
}