From 332b6f666c48a4ac2c902cacfe374dd9168ac151 Mon Sep 17 00:00:00 2001
From: Arty Bishop <bishop.arty@gmail.com>
Date: Sun, 21 Mar 2021 19:48:20 +0000
Subject: [PATCH] Added several extension functions

---
 .../rtbishop/look4sat/utility/Extensions.kt   | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/app/src/main/java/com/rtbishop/look4sat/utility/Extensions.kt b/app/src/main/java/com/rtbishop/look4sat/utility/Extensions.kt
index 4bbdbaf6..cdd2c025 100644
--- a/app/src/main/java/com/rtbishop/look4sat/utility/Extensions.kt
+++ b/app/src/main/java/com/rtbishop/look4sat/utility/Extensions.kt
@@ -38,6 +38,10 @@ import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.callbackFlow
 import java.util.concurrent.TimeUnit
+import kotlin.math.max
+import kotlin.math.min
+import kotlin.math.pow
+import kotlin.math.sqrt
 
 fun Long.formatForTimer(): String {
     val format = "%02d:%02d:%02d"
@@ -47,12 +51,37 @@ fun Long.formatForTimer(): String {
     return String.format(format, hours, minutes, seconds)
 }
 
+fun Long.getDopplerFreq(rangeRate: Double, isDownlink: Boolean): Long {
+    val speedOfLight = 2.99792458E8
+    return if (isDownlink) {
+        (this.toDouble() * (speedOfLight - rangeRate * 1000.0) / speedOfLight).toLong()
+    } else {
+        (this.toDouble() * (speedOfLight + rangeRate * 1000.0) / speedOfLight).toLong()
+    }
+}
+
 fun Double.round(decimals: Int): Double {
     var multiplier = 1.0
     repeat(decimals) { multiplier *= 10 }
     return kotlin.math.round(this * multiplier) / multiplier
 }
 
+fun Double.toOsmLat(): Double {
+    return min(max(this, -85.0), 85.0)
+}
+
+fun Double.toOsmLon(): Double {
+    val newLon = if (this < -180.0) this + 360.0 else if (this > 180.0) this - 360.0 else this
+    return min(max(newLon, -180.0), 180.0)
+}
+
+fun Double.getOrbitalVelocity(): Double {
+    val earthG = 6.674 * 10.0.pow(-11)
+    val earthM = 5.98 * 10.0.pow(24)
+    val radius = 6.37 * 10.0.pow(6) + this * 10.0.pow(3)
+    return sqrt(earthG * earthM / radius) / 1000
+}
+
 fun Satellite.getPredictor(stationPosition: GroundStationPosition): PassPredictor {
     return PassPredictor(this, stationPosition)
 }