geo 0.9.1

Geospatial primitives and algorithms
Documentation 
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use num_traits::{Float, FromPrimitive};

use ::{Line, LineString, MultiLineString};
use algorithm::vincenty_distance::{VincentyDistance, FailedToConvergeError};

pub trait VincentyLength<T, RHS = Self> {
    fn vincenty_length(&self) -> Result<T, FailedToConvergeError>;
}

impl<T> VincentyLength<T> for Line<T>
    where T: Float + FromPrimitive
{
    /// The units of the returned value is meters.
    fn vincenty_length(&self) -> Result<T, FailedToConvergeError> {
        self.start.vincenty_distance(&self.end)
    }
}

impl<T> VincentyLength<T> for LineString<T>
    where T: Float + FromPrimitive
{
    fn vincenty_length(&self) -> Result<T, FailedToConvergeError> {
        let mut length = T::zero();
        for window in self.0.windows(2) {
            length = length + window[0].vincenty_distance(&window[1])?;
        }
        Ok(length)
    }
}

impl<T> VincentyLength<T> for MultiLineString<T>
    where T: Float + FromPrimitive
{
    fn vincenty_length(&self) -> Result<T, FailedToConvergeError> {
        let mut length = T::zero();
        for line_string in &self.0 {
            length = length + line_string.vincenty_length()?;
        }
        Ok(length)
    }
}