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 else -> null } } }