startin 0.8.3

A Delaunay triangulator for terrains.
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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184

use crate::startin::interpolation::interpolate;
use crate::startin::Triangulation;
use rand::prelude::*;
use startin;

fn four_points() -> Triangulation {
    let mut pts: Vec<[f64; 3]> = Vec::new();
    pts.push([0.0, 0.0, 1.0]);
    pts.push([10.0, 0.0, 2.0]);
    pts.push([10.0, 10.0, 3.0]);
    pts.push([0.0, 10.0, 4.0]);
    let mut dt = startin::Triangulation::new();
    dt.insert(&pts, startin::InsertionStrategy::AsIs);
    dt
}

fn random_points_500() -> Triangulation {
    let mut dt = startin::Triangulation::new();
    let mut rng = rand::thread_rng();
    for _i in 0..500 {
        let x: f64 = rng.gen();
        let y: f64 = rng.gen();
        let z: f64 = rng.gen();
        let _re = dt.insert_one_pt(x * 100.0, y * 100.0, z * 10.0);
    }
    dt
}

#[test]
fn empty() {
    let mut dt = startin::Triangulation::new();
    let i_nn = startin::interpolation::NN {};
    let i_tin = startin::interpolation::TIN {};
    let i_lap = startin::interpolation::Laplace {};
    let i_nni = startin::interpolation::NNI { precompute: false };
    let i_idw = startin::interpolation::IDW {
        radius: 1.0,
        power: 2.0,
    };
    assert_eq!(
        Err(startin::StartinError::EmptyTriangulation),
        startin::interpolation::interpolate(&i_nn, &mut dt, &vec![[51.0, 42.0]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::EmptyTriangulation),
        interpolate(&i_tin, &mut dt, &vec![[51.0, 42.0]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::EmptyTriangulation),
        interpolate(&i_lap, &mut dt, &vec![[51.0, 42.0]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::EmptyTriangulation),
        interpolate(&i_nni, &mut dt, &vec![[51.0, 42.0]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::SearchCircleEmpty),
        interpolate(&i_idw, &mut dt, &vec![[51.0, 42.0]])[0]
    );
}

#[test]
fn idw() {
    let mut dt = four_points();
    let i_idw = startin::interpolation::IDW {
        radius: 3.0,
        power: 2.0,
    };
    assert_eq!(
        Err(startin::StartinError::SearchCircleEmpty),
        startin::interpolation::interpolate(&i_idw, &mut dt, &vec![[5.0, 5.0]])[0]
    );
    assert_eq!(
        Ok(3.0),
        startin::interpolation::interpolate(&i_idw, &mut dt, &vec![[9.0, 9.0]])[0]
    );
}

#[test]
fn outside_ch() {
    let mut dt = four_points();
    let i_nn = startin::interpolation::NN {};
    let i_tin = startin::interpolation::TIN {};
    let i_lap = startin::interpolation::Laplace {};
    let i_nni = startin::interpolation::NNI { precompute: false };
    assert_eq!(
        Err(startin::StartinError::OutsideConvexHull),
        startin::interpolation::interpolate(&i_nn, &mut dt, &vec![[5.0, -0.1]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::OutsideConvexHull),
        interpolate(&i_tin, &mut dt, &vec![[5.0, -0.1]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::OutsideConvexHull),
        interpolate(&i_lap, &mut dt, &vec![[5.0, -0.1]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::OutsideConvexHull),
        interpolate(&i_nni, &mut dt, &vec![[5.0, -0.1]])[0]
    );
    assert_eq!(
        Err(startin::StartinError::OutsideConvexHull),
        interpolate(&i_nni, &mut dt, &vec![[5.0, 0.0]])[0]
    );
}

#[test]
fn existing_point() {
    let mut dt = four_points();
    let _re = dt.insert_one_pt(5.0, 5.0, 11.1);

    let i_nn = startin::interpolation::NN {};
    let i_tin = startin::interpolation::TIN {};
    let i_lap = startin::interpolation::Laplace {};
    let i_nni = startin::interpolation::NNI { precompute: false };
    let i_idw = startin::interpolation::IDW {
        radius: 1.0,
        power: 2.0,
    };
    assert_eq!(
        Ok(11.1),
        startin::interpolation::interpolate(&i_nn, &mut dt, &vec![[5.0, 5.0]])[0]
    );
    assert_eq!(Ok(11.1), interpolate(&i_tin, &mut dt, &vec![[5.0, 5.0]])[0]);
    assert_eq!(Ok(11.1), interpolate(&i_lap, &mut dt, &vec![[5.0, 5.0]])[0]);
    assert_eq!(Ok(11.1), interpolate(&i_nni, &mut dt, &vec![[5.0, 5.0]])[0]);
    assert_eq!(Ok(11.1), interpolate(&i_idw, &mut dt, &vec![[5.0, 5.0]])[0]);
}

#[test]
fn existing_point_lowest() {
    let mut pts: Vec<[f64; 3]> = Vec::new();
    pts.push([0.0, 0.0, 1.0]);
    pts.push([10.0, 0.0, 2.0]);
    pts.push([10.0, 10.0, 3.0]);
    pts.push([0.0, 10.0, 4.0]);
    let mut dt = startin::Triangulation::new();
    dt.set_duplicates_handling(startin::DuplicateHandling::Lowest);
    dt.insert(&pts, startin::InsertionStrategy::AsIs);
    let _re = dt.insert_one_pt(5.0, 5.0, 11.1);

    let i_lap = startin::interpolation::Laplace {};
    assert_eq!(Ok(11.1), interpolate(&i_lap, &mut dt, &vec![[5.0, 5.0]])[0]);

    let i_nni = startin::interpolation::NNI { precompute: false };
    assert_eq!(Ok(11.1), interpolate(&i_nni, &mut dt, &vec![[5.0, 5.0]])[0]);
}

#[test]
fn middle() {
    let mut dt = four_points();
    let i_lap = startin::interpolation::Laplace {};
    let i_nni = startin::interpolation::NNI { precompute: false };
    let i_tin = startin::interpolation::TIN {};
    assert_eq!(Ok(2.5), interpolate(&i_lap, &mut dt, &vec![[5.0, 5.0]])[0]);
    assert_eq!(Ok(2.5), interpolate(&i_nni, &mut dt, &vec![[5.0, 5.0]])[0]);
    assert_eq!(Ok(3.0), interpolate(&i_tin, &mut dt, &vec![[5.0, 5.0]])[0]);
}

#[test]
fn nn() {
    let mut dt = four_points();
    let _re = dt.insert_one_pt(5.0, 5.0, 11.1);
    let i_nn = startin::interpolation::NN {};
    assert_eq!(
        Ok(11.1),
        startin::interpolation::interpolate(&i_nn, &mut dt, &vec![[5.1, 5.1]])[0]
    );
}

#[test]
fn tin_linear_random() {
    let mut dt = random_points_500();
    let i_tin = startin::interpolation::TIN {};
    assert_eq!(
        Err(startin::StartinError::OutsideConvexHull),
        startin::interpolation::interpolate(&i_tin, &mut dt, &vec![[144.0, 48.0]])[0]
    );
    assert_eq!(
        true,
        startin::interpolation::interpolate(&i_tin, &mut dt, &vec![[44.0, 48.0]])[0].is_ok()
    );
}