blob: d4d69fa1f2f8cb92f1b893af6e68599d68389f5c (
plain)
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
|
package mx.trackermap.TrackerMap.utils
class MapCalculus {
companion object {
/**
* WhirlyGlobe library uses height rather than zoom levels, but it supports converting
* Mapnik denominator scales to height, so we can first convert zoom levels to Mapnik
* denominator scales, and then convert them to height using WhirlyGlobe.
* Source: https://github.com/openstreetmap/mapnik-stylesheets/blob/master/zoom-to-scale.txt
*/
fun zoomLevelToScale(zoom: Int): Double? =
when (zoom) {
1 -> 279541132.014
2 -> 139770566.007
3 -> 69885283.0036
4 -> 34942641.5018
5 -> 17471320.7509
6 -> 8735660.37545
7 -> 4367830.18772
8 -> 2183915.09386
9 -> 1091957.54693
10 -> 545978.773466
11 -> 272989.386733
12 -> 136494.693366
13 -> 68247.3466832
14 -> 34123.6733416
15 -> 17061.8366708
16 -> 8530.9183354
17 -> 4265.4591677
18 -> 2132.72958385
19 -> 1066.36479193
20 -> 533.182395965
21 -> 266.5911979825
22 -> 133.29559899125
23 -> 66.647799495625
24 -> 33.3238997478125
else -> null
}
}
}
|
