-
Notifications
You must be signed in to change notification settings - Fork 1
/
box.go
71 lines (63 loc) · 1.97 KB
/
box.go
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
package geojson
import (
"encoding/json"
"fmt"
)
// BoundingBox represents a bounding box in either 2D or 3D space.
type BoundingBox struct {
BottomLeft Position
TopRight Position
}
// MarshalJSON returns the JSON encoding of the box.
// It is an error if only 1 elevation value is set - either both positions or neither must have it.
func (b BoundingBox) MarshalJSON() ([]byte, error) {
if b.BottomLeft.Elevation.IsSet() || b.TopRight.Elevation.IsSet() {
if !b.BottomLeft.Elevation.IsSet() || !b.TopRight.Elevation.IsSet() {
return nil, fmt.Errorf("bounding box positions must be in the same dimension")
}
return json.Marshal(&position{
b.BottomLeft.Lng.Degrees(),
b.BottomLeft.Lat.Degrees(),
b.BottomLeft.Elevation.Value(),
b.TopRight.Lng.Degrees(),
b.TopRight.Lat.Degrees(),
b.TopRight.Elevation.Value(),
})
}
return json.Marshal(&position{
b.BottomLeft.Lng.Degrees(),
b.BottomLeft.Lat.Degrees(),
b.TopRight.Lng.Degrees(),
b.TopRight.Lat.Degrees(),
})
}
// UnmarshalJSON parses the JSON-encoded data and stores the results.
func (b *BoundingBox) UnmarshalJSON(data []byte) error {
pos := position{}
if err := json.Unmarshal(data, &pos); err != nil {
return err
}
switch len(pos) {
case 4:
b.BottomLeft = MakePosition(pos[1], pos[0])
b.TopRight = MakePosition(pos[3], pos[2])
case 6:
b.BottomLeft = MakePositionWithElevation(pos[1], pos[0], pos[2])
b.TopRight = MakePositionWithElevation(pos[4], pos[3], pos[5])
default:
return fmt.Errorf("invalid position")
}
return nil
}
// Validate the bounding box.
func (b BoundingBox) Validate() error {
if (b.BottomLeft.Elevation.IsSet() && b.TopRight.Elevation.IsSet()) ||
(!b.BottomLeft.Elevation.IsSet() && !b.TopRight.Elevation.IsSet()) {
return fmt.Errorf("bounding box positions must be in the same dimension")
} else if !b.BottomLeft.IsValid() {
return fmt.Errorf("bottom left is invalid")
} else if !b.TopRight.IsValid() {
return fmt.Errorf("top right is invalid")
}
return nil
}