flatrtree-go/box_dist_test.go at main · flatrtree/flatrtree-go · GitHub

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
package flatrtree

import (
	"math"
	"testing"

	"github.com/stretchr/testify/require"
)

var (
	inside    = [2]float64{-73.649597, 45.51982}
	north     = [2]float64{-73.627625, 45.815401}
	northEast = [2]float64{-72.951965, 45.823057}
	east      = [2]float64{-72.927246, 45.512121}
	southEast = [2]float64{-72.946472, 45.154927}
	south     = [2]float64{-73.624878, 45.13168}
	southWest = [2]float64{-74.382935, 45.182037}
	west      = [2]float64{-74.374695, 45.494796}
	northWest = [2]float64{-74.344482, 45.811572}

	bboxMin = [2]float64{-74.19342, 45.265222}
	bboxMax = [2]float64{-73.157959, 45.704261}

	epsilon = 1e-5
)

func haversine(a, b [2]float64) float64 {
	return earthRadiusMeters * distRad(
		a[1]*math.Pi/180, a[0]*math.Pi/180,
		b[1]*math.Pi/180, b[0]*math.Pi/180,
	)
}

func TestGeodeticBoxDistInside(t *testing.T) {
	expected := 0.0
	actual := GeodeticBoxDist(
		inside[0], inside[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.Equal(t, expected, actual)
}

func TestGeodeticBoxDistNorth(t *testing.T) {
	expected := haversine(north, [2]float64{north[0], bboxMax[1]})
	actual := GeodeticBoxDist(
		north[0], north[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestGeodeticBoxDistNorthEast(t *testing.T) {
	expected := haversine(northEast, bboxMax)
	actual := GeodeticBoxDist(
		northEast[0], northEast[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestGeodeticBoxDistEast(t *testing.T) {
	expected := haversine(east, [2]float64{bboxMax[0], east[1]})
	actual := GeodeticBoxDist(
		east[0], east[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestGeodeticBoxDistSouthEast(t *testing.T) {
	expected := haversine(southEast, [2]float64{bboxMax[0], bboxMin[1]})
	actual := GeodeticBoxDist(
		southEast[0], southEast[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestGeodeticBoxDistSouth(t *testing.T) {
	expected := haversine(south, [2]float64{south[0], bboxMin[1]})
	actual := GeodeticBoxDist(
		south[0], south[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestGeodeticBoxDistSouthWest(t *testing.T) {
	expected := haversine(southWest, bboxMin)
	actual := GeodeticBoxDist(
		southWest[0], southWest[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestGeodeticBoxDistWest(t *testing.T) {
	expected := haversine(west, [2]float64{bboxMin[0], west[1]})
	actual := GeodeticBoxDist(
		west[0], west[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestGeodeticBoxDistNorthWest(t *testing.T) {
	expected := haversine(northWest, [2]float64{bboxMin[0], bboxMax[1]})
	actual := GeodeticBoxDist(
		northWest[0], northWest[1],
		bboxMin[0], bboxMin[1],
		bboxMax[0], bboxMax[1],
	)
	require.InEpsilon(t, expected, actual, epsilon)
}

func TestPlanarBoxDist(t *testing.T) {
	var (
		minX = 0.0
		minY = 0.0
		maxX = 2.0
		maxY = 2.0
		midY = (maxX - minX) / 2
		midy = (maxY - minY) / 2
	)

	// inside
	require.Equal(t, 0.0, PlanarBoxDist(midY, midy, minX, minY, maxX, maxY))
	// top
	require.Equal(t, 1.0, PlanarBoxDist(midY, maxY+1, minX, minY, maxX, maxY))
	// top right
	require.Equal(t, 2.0, PlanarBoxDist(maxX+1, maxY+1, minX, minY, maxX, maxY))
	// right
	require.Equal(t, 1.0, PlanarBoxDist(maxX+1, midy, minX, minY, maxX, maxY))
	// bottom right
	require.Equal(t, 2.0, PlanarBoxDist(maxX+1, minY-1, minX, minY, maxX, maxY))
	// bottom
	require.Equal(t, 1.0, PlanarBoxDist(midY, minY-1, minX, minY, maxX, maxY))
	// bottom left
	require.Equal(t, 2.0, PlanarBoxDist(minX-1, minY-1, minX, minY, maxX, maxY))
	// left
	require.Equal(t, 1.0, PlanarBoxDist(minX-1, midy, minX, minY, maxX, maxY))
	// top right
	require.Equal(t, 2.0, PlanarBoxDist(minX-1, maxY+1, minX, minY, maxX, maxY))
}