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geo 0.9.1

Geospatial primitives and algorithms
Documentation 
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use ::CoordinateType;
use algorithm::map_coords::{MapCoords, MapCoordsInplace};

pub trait Translate<T> {
    /// Translate a Geometry along its axes by the given offsets
    ///
    ///
    /// ```
    /// use geo::{Point, LineString};
    /// use geo::algorithm::translate::{Translate};
    ///
    /// let mut vec = Vec::new();
    /// vec.push(Point::new(0.0, 0.0));
    /// vec.push(Point::new(5.0, 5.0));
    /// vec.push(Point::new(10.0, 10.0));
    /// let linestring = LineString(vec);
    /// let translated = linestring.translate(1.5, 3.5);
    /// let mut correct = Vec::new();
    /// correct.push(Point::new(1.5, 3.5));
    /// correct.push(Point::new(6.5, 8.5));
    /// correct.push(Point::new(11.5, 13.5));
    /// let correct_ls = LineString(correct);
    /// assert_eq!(translated, correct_ls);
    /// ```
    fn translate(&self, xoff: T, yoff: T) -> Self where T: CoordinateType;

    /// Translate a Geometry along its axes, but in place.
    fn translate_inplace(&mut self, xoff: T, yoff: T) where T: CoordinateType;
}

impl<T, G> Translate<T> for G
    where T: CoordinateType,
        G: MapCoords<T, T, Output=G>+MapCoordsInplace<T>
{
    fn translate(&self, xoff: T, yoff: T) -> Self {
        self.map_coords(&|&(x, y)| (x + xoff, y + yoff))
    }

    fn translate_inplace(&mut self, xoff: T, yoff: T) {
        self.map_coords_inplace(&|&(x, y)| (x + xoff, y + yoff))
    }
}

#[cfg(test)]
mod test {
  use ::{LineString, Point, Polygon};
  use super::*;
  #[test]
  fn test_translate_point() {
    let p = Point::new(1.0, 5.0);
    let translated = p.translate(30.0, 20.0);
    assert_eq!(translated, Point::new(31.0, 25.0));
  }
  #[test]
  fn test_translate_linestring() {
    let mut vec = Vec::new();
    vec.push(Point::new(0.0, 0.0));
    vec.push(Point::new(5.0, 1.0));
    vec.push(Point::new(10.0, 0.0));
    let linestring = LineString(vec);
    let translated = linestring.translate(17.0, 18.0);
    let mut correct = Vec::new();
    correct.push(Point::new(17.0, 18.0));
    correct.push(Point::new(22.0, 19.0));
    correct.push(Point::new(27., 18.));
    let correct_ls = LineString(correct);
    assert_eq!(translated, correct_ls);
  }
  #[test]
  fn test_translate_polygon() {
    let points_raw = vec![
      (5., 1.),
      (4., 2.),
      (4., 3.),
      (5., 4.),
      (6., 4.),
      (7., 3.),
      (7., 2.),
      (6., 1.),
      (5., 1.),
    ];
    let points = points_raw
      .iter()
      .map(|e| Point::new(e.0, e.1))
      .collect::<Vec<_>>();
    let poly1 = Polygon::new(LineString(points), vec![]);
    let translated = poly1.translate(17.0, 18.0);
    let correct_outside = vec![
      (22.0, 19.0),
      (21.0, 20.0),
      (21.0, 21.0),
      (22.0, 22.0),
      (23.0, 22.0),
      (24.0, 21.0),
      (24.0, 20.0),
      (23.0, 19.0),
      (22.0, 19.0),
    ];
    let correct = Polygon::new(
      LineString(
        correct_outside
          .iter()
          .map(|e| Point::new(e.0, e.1))
          .collect::<Vec<_>>(),
      ),
      vec![],
    );
    // results agree with Shapely / GEOS
    assert_eq!(translated, correct);
  }
  #[test]
  fn test_rotate_polygon_holes() {
    let ls1 = LineString(vec![
      Point::new(5.0, 1.0),
      Point::new(4.0, 2.0),
      Point::new(4.0, 3.0),
      Point::new(5.0, 4.0),
      Point::new(6.0, 4.0),
      Point::new(7.0, 3.0),
      Point::new(7.0, 2.0),
      Point::new(6.0, 1.0),
      Point::new(5.0, 1.0),
    ]);

    let ls2 = LineString(vec![
      Point::new(5.0, 1.3),
      Point::new(5.5, 2.0),
      Point::new(6.0, 1.3),
      Point::new(5.0, 1.3),
    ]);

    let poly1 = Polygon::new(ls1, vec![ls2]);
    let rotated = poly1.translate(17.0, 18.0);
    let correct_outside = vec![
      (22.0, 19.0),
      (21.0, 20.0),
      (21.0, 21.0),
      (22.0, 22.0),
      (23.0, 22.0),
      (24.0, 21.0),
      (24.0, 20.0),
      (23.0, 19.0),
      (22.0, 19.0),
    ].iter()
      .map(|e| Point::new(e.0, e.1))
      .collect::<Vec<_>>();
    let correct_inside = vec![(22.0, 19.3), (22.5, 20.0), (23.0, 19.3), (22.0, 19.3)]
      .iter()
      .map(|e| Point::new(e.0, e.1))
      .collect::<Vec<_>>();
    assert_eq!(rotated.exterior.0, correct_outside);
    assert_eq!(rotated.interiors[0].0, correct_inside);
  }
}