geo 0.23.1

Geospatial primitives and algorithms
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

use super::{impl_contains_from_relate, impl_contains_geometry_for, Contains};
use crate::algorithm::Intersects;
use crate::geometry::*;
use crate::{CoordNum, GeoFloat, GeoNum};

// ┌────────────────────────────────┐
// │ Implementations for LineString │
// └────────────────────────────────┘

impl<T> Contains<Coord<T>> for LineString<T>
where
    T: GeoNum,
{
    fn contains(&self, coord: &Coord<T>) -> bool {
        if self.0.is_empty() {
            return false;
        }

        if coord == &self.0[0] || coord == self.0.last().unwrap() {
            return self.is_closed();
        }

        self.lines()
            .enumerate()
            .any(|(i, line)| line.contains(coord) || (i > 0 && coord == &line.start))
    }
}

impl<T> Contains<Point<T>> for LineString<T>
where
    T: GeoNum,
{
    fn contains(&self, p: &Point<T>) -> bool {
        self.contains(&p.0)
    }
}

impl<T> Contains<Line<T>> for LineString<T>
where
    T: GeoNum,
{
    fn contains(&self, line: &Line<T>) -> bool {
        if line.start == line.end {
            return self.contains(&line.start);
        }

        // We copy the line as we may truncate the line as
        // we find partial matches.
        let mut line = *line;
        let mut first_cut = None;

        let lines_iter = self.lines();
        let num_lines = lines_iter.len();

        // We need to repeat the logic twice to handle cases
        // where the linestring starts at the middle of the line.
        for (i, segment) in self.lines().chain(lines_iter).enumerate() {
            if i >= num_lines {
                // The first loop was done. If we never cut
                // the line, or at the cut segment again, we
                // can exit now.
                if let Some(upto_i) = first_cut {
                    if i >= num_lines + upto_i {
                        break;
                    }
                } else {
                    break;
                }
            }
            // Look for a segment that intersects at least
            // one of the end points.
            let other = if segment.intersects(&line.start) {
                line.end
            } else if segment.intersects(&line.end) {
                line.start
            } else {
                continue;
            };

            // If the other end point also intersects this
            // segment, then we are done.
            let new_inside = if segment.intersects(&other) {
                return true;
            }
            // otoh, if the line contains one of the ends of
            // the segments, then we truncate the line to
            // the part outside.
            else if line.contains(&segment.start) {
                segment.start
            } else if line.contains(&segment.end) {
                segment.end
            } else {
                continue;
            };

            first_cut = first_cut.or(Some(i));
            if other == line.start {
                line.end = new_inside;
            } else {
                line.start = new_inside;
            }
        }

        false
    }
}

impl<T> Contains<LineString<T>> for LineString<T>
where
    T: GeoNum,
{
    fn contains(&self, rhs: &LineString<T>) -> bool {
        rhs.lines().all(|l| self.contains(&l))
    }
}

impl_contains_from_relate!(LineString<T>, [Polygon<T>, MultiPoint<T>, MultiLineString<T>, MultiPolygon<T>, GeometryCollection<T>, Rect<T>, Triangle<T>]);
impl_contains_geometry_for!(LineString<T>);

// ┌─────────────────────────────────────┐
// │ Implementations for MultiLineString │
// └─────────────────────────────────────┘

impl_contains_from_relate!(MultiLineString<T>, [Line<T>, LineString<T>, Polygon<T>, MultiPoint<T>, MultiLineString<T>, MultiPolygon<T>, GeometryCollection<T>, Rect<T>, Triangle<T>]);
impl_contains_geometry_for!(MultiLineString<T>);

impl<T> Contains<Point<T>> for MultiLineString<T>
where
    T: CoordNum,
    LineString<T>: Contains<Point<T>>,
{
    fn contains(&self, rhs: &Point<T>) -> bool {
        self.iter().any(|ls| ls.contains(rhs))
    }
}