From 18bc70d4fa7453c1191fc446327d1e24d5defe6d Mon Sep 17 00:00:00 2001
From: Iván Ávalos <avalos@disroot.org>
Date: Sun, 16 Jan 2022 02:31:26 -0600
Subject: Set zoom limits of mapControl by converting zoom levels to Mapnik
 scale denominators

---
 .../mx/trackermap/TrackerMap/utils/MapCalculus.kt  | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 shared/src/commonMain/kotlin/mx/trackermap/TrackerMap/utils/MapCalculus.kt

(limited to 'shared/src/commonMain/kotlin/mx/trackermap/TrackerMap/utils/MapCalculus.kt')

diff --git a/shared/src/commonMain/kotlin/mx/trackermap/TrackerMap/utils/MapCalculus.kt b/shared/src/commonMain/kotlin/mx/trackermap/TrackerMap/utils/MapCalculus.kt
new file mode 100644
index 0000000..8c58179
--- /dev/null
+++ b/shared/src/commonMain/kotlin/mx/trackermap/TrackerMap/utils/MapCalculus.kt
@@ -0,0 +1,31 @@
+package mx.trackermap.TrackerMap.utils
+
+class MapCalculus {
+    companion object {
+        // 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 -> 1000.0 // made up
+                20 -> 500.0 // made up
+                else -> null
+        }
+    }
+}
\ No newline at end of file
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