Further refactoring of Look4Sat core module classes

core/src/main/java/com/rtbishop/look4sat/data/LocalDataSource.kt

@@ -17,13 +17,13 @@
  */
 package com.rtbishop.look4sat.data
 
-import com.rtbishop.look4sat.domain.model.SatEntry
-import com.rtbishop.look4sat.domain.model.SatItem
-import com.rtbishop.look4sat.domain.model.SatTrans
-import com.rtbishop.look4sat.domain.predict4kotlin.Satellite
+import com.rtbishop.look4sat.domain.SatEntry
+import com.rtbishop.look4sat.domain.SatItem
+import com.rtbishop.look4sat.domain.SatTrans
+import com.rtbishop.look4sat.domain.Satellite
 import kotlinx.coroutines.flow.Flow
 
-interface SatDataLocalSource {
+interface LocalDataSource {
 
     fun getSatItems(): Flow<List<SatItem>>
 

core/src/main/java/com/rtbishop/look4sat/data/PassPredictor.kt

@@ -0,0 +1,388 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2021 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.data
+
+import com.rtbishop.look4sat.domain.*
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.withContext
+import java.util.*
+import kotlin.math.max
+import kotlin.math.min
+import kotlin.math.pow
+import kotlin.math.sqrt
+
+class PassPredictor(private val defaultDispatcher: CoroutineDispatcher) {
+
+    // Radar view - beacon
+    private val _skyPosition = MutableSharedFlow<SatPos>(replay = 1)
+    val skyPosition: SharedFlow<SatPos> = _skyPosition
+
+    suspend fun getSkyPosition(pass: SatPass, stationPos: StationPos, date: Date) {
+        withContext(defaultDispatcher) {
+            _skyPosition.emit(pass.satellite.getPosition(stationPos, date.time))
+        }
+    }
+
+    // Radar view - track
+    private val _skyTrack = MutableSharedFlow<List<SatPos>>(replay = 1)
+    val skyTrack: SharedFlow<List<SatPos>> = _skyTrack
+
+    suspend fun getSkyTrack(pass: SatPass, stationPos: StationPos) {
+        withContext(defaultDispatcher) {
+            val positions = mutableListOf<SatPos>()
+            var currentTime = pass.aosTime
+            while (currentTime < pass.losTime) {
+                positions.add(pass.satellite.getPosition(stationPos, currentTime))
+                currentTime += 15000
+            }
+            _skyTrack.emit(positions)
+        }
+    }
+
+    // Map view - beacons
+    private val _mapPositions = MutableSharedFlow<Map<Satellite, GeoPos>>(replay = 1)
+    val mapPositions: SharedFlow<Map<Satellite, GeoPos>> = _mapPositions
+
+    suspend fun getMapPositions(satellites: List<Satellite>, stationPos: StationPos, date: Date) {
+        withContext(defaultDispatcher) {
+            val positions = mutableMapOf<Satellite, GeoPos>()
+            satellites.forEach { satellite ->
+                val satPos = satellite.getPosition(stationPos, date.time)
+                val osmLat = clipLat(Math.toDegrees(satPos.latitude))
+                val osmLon = clipLon(Math.toDegrees(satPos.longitude))
+                positions[satellite] = GeoPos(osmLat, osmLon)
+            }
+            _mapPositions.emit(positions)
+        }
+    }
+
+    // Map view - track
+    private val _mapTrack = MutableSharedFlow<List<List<GeoPos>>>(replay = 1)
+    val mapTrack: SharedFlow<List<List<GeoPos>>> = _mapTrack
+
+    suspend fun getMapTrack(satellite: Satellite, stationPos: StationPos, date: Date) {
+        withContext(defaultDispatcher) {
+            val positions = mutableListOf<SatPos>()
+            val orbitalPeriod = satellite.getQuarterOrbitMin() * 4
+            val endTime = date.time + (orbitalPeriod * 2.4 * 60L * 1000L).toLong()
+            var currentTime = date.time
+            while (currentTime < endTime) {
+                positions.add(satellite.getPosition(stationPos, currentTime))
+                currentTime += 15000
+            }
+
+            val satTracks = mutableListOf<List<GeoPos>>()
+            val currentTrack = mutableListOf<GeoPos>()
+            var oldLongitude = 0.0
+            positions.forEach { satPos ->
+                val osmLat = clipLat(Math.toDegrees(satPos.latitude))
+                val osmLon = clipLon(Math.toDegrees(satPos.longitude))
+                val currentPos = GeoPos(osmLat, osmLon)
+                if (oldLongitude < -170.0 && currentPos.longitude > 170.0) {
+                    // adding left terminal position
+                    currentTrack.add(GeoPos(osmLat, -180.0))
+                    satTracks.add(mutableListOf<GeoPos>().apply { addAll(currentTrack) })
+                    currentTrack.clear()
+                } else if (oldLongitude > 170.0 && currentPos.longitude < -170.0) {
+                    // adding right terminal position
+                    currentTrack.add(GeoPos(osmLat, 180.0))
+                    satTracks.add(mutableListOf<GeoPos>().apply { addAll(currentTrack) })
+                    currentTrack.clear()
+                }
+                oldLongitude = currentPos.longitude
+                currentTrack.add(currentPos)
+            }
+            satTracks.add(currentTrack)
+            _mapTrack.emit(satTracks)
+        }
+    }
+
+    private val _mapFootprint = MutableSharedFlow<List<GeoPos>>(replay = 1)
+    val mapFootprint: SharedFlow<List<GeoPos>> = _mapFootprint
+
+    suspend fun setSelectedSatFootprint(satellite: Satellite, stationPos: StationPos, date: Date) {
+        withContext(defaultDispatcher) {
+            val satPos = satellite.getPosition(stationPos, date.time)
+            val satFootprint = satPos.getRangeCircle().map { groundPos ->
+                val osmLat = clipLat(groundPos.latitude)
+                val osmLon = clipLon(groundPos.longitude)
+                GeoPos(osmLat, osmLon)
+            }
+            _mapFootprint.emit(satFootprint)
+        }
+    }
+
+    private val _satData = MutableSharedFlow<SatData>(replay = 1)
+    val satData: SharedFlow<SatData> = _satData
+
+    suspend fun setSelectedSatData(satellite: Satellite, stationPos: StationPos, date: Date) {
+        withContext(defaultDispatcher) {
+            val satPos = satellite.getPosition(stationPos, date.time)
+            val osmLat = clipLat(Math.toDegrees(satPos.latitude))
+            val osmLon = clipLon(Math.toDegrees(satPos.longitude))
+            val osmPos = GeoPos(osmLat, osmLon)
+            val qthLoc = QthConverter.positionToQTH(osmPos.latitude, osmPos.longitude) ?: "-- --"
+            val velocity = getOrbitalVelocity(satPos.altitude)
+            val satData = SatData(
+                satellite, satellite.params.catnum, satellite.params.name, satPos.range,
+                satPos.altitude, velocity, qthLoc, osmPos
+            )
+            _satData.emit(satData)
+        }
+    }
+
+    private fun getOrbitalVelocity(altitude: Double): 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) + altitude * 10.0.pow(3)
+        return sqrt(earthG * earthM / radius) / 1000
+    }
+
+    private fun clipLat(pLatitude: Double): Double {
+        return clip(pLatitude, -85.05, 85.05)
+    }
+
+    private fun clipLon(pLongitude: Double): Double {
+        var result = pLongitude
+        while (result < -180.0) result += 360.0
+        while (result > 180.0) result -= 360.0
+        return clip(result, -180.0, 180.0)
+    }
+
+    private fun clip(currentValue: Double, minValue: Double, maxValue: Double): Double {
+        return min(max(currentValue, minValue), maxValue)
+    }
+
+    fun getPositions(
+        satellite: Satellite,
+        stationPos: StationPos,
+        refDate: Date,
+        stepSec: Int,
+        minBefore: Int,
+        orbits: Double
+    ): List<SatPos> {
+        val positions = mutableListOf<SatPos>()
+        val orbitalPeriod = 24 * 60 / satellite.params.meanmo
+        val endDate = Date(refDate.time + (orbitalPeriod * orbits * 60L * 1000L).toLong())
+        val startDate = Date(refDate.time - minBefore * 60L * 1000L)
+        var currentDate = startDate
+        while (currentDate.before(endDate)) {
+            val satPos = satellite.getPosition(stationPos, currentDate.time)
+            positions.add(satPos)
+            currentDate = Date(currentDate.time + stepSec * 1000)
+        }
+        return positions
+    }
+
+    // List view - passes
+    private val _passes = MutableSharedFlow<List<SatPass>>(replay = 1)
+    private var selectedSatellites = emptyList<Satellite>()
+    val passes: SharedFlow<List<SatPass>> = _passes
+
+    suspend fun triggerCalculation(
+        satellites: List<Satellite>,
+        stationPos: StationPos,
+        refDate: Date = Date(),
+        hoursAhead: Int = 8
+    ) {
+        if (satellites.isEmpty()) {
+            _passes.emit(emptyList())
+        } else {
+            val oldCatNums = selectedSatellites.map { it.params.catnum }
+            val newCatNums = satellites.map { it.params.catnum }
+            if (oldCatNums != newCatNums) forceCalculation(
+                satellites,
+                stationPos,
+                refDate,
+                hoursAhead
+            )
+        }
+    }
+
+    suspend fun forceCalculation(
+        satellites: List<Satellite>,
+        stationPos: StationPos,
+        refDate: Date = Date(),
+        hoursAhead: Int = 8
+    ) {
+        if (satellites.isEmpty()) {
+            _passes.emit(emptyList())
+        } else {
+            withContext(defaultDispatcher) {
+                val allPasses = mutableListOf<SatPass>()
+                selectedSatellites = satellites
+                satellites.forEach { satellite ->
+                    val passes = getPasses(satellite, stationPos, refDate, hoursAhead)
+                    allPasses.addAll(passes)
+                }
+                _passes.emit(filterPasses(allPasses, refDate))
+            }
+        }
+    }
+
+    private fun getPasses(
+        satellite: Satellite,
+        stationPos: StationPos,
+        date: Date,
+        hoursAhead: Int
+    ): List<SatPass> {
+        val passes = mutableListOf<SatPass>()
+        val endDate = Date(date.time + hoursAhead * 60L * 60L * 1000L)
+        val quarterOrbitMin = satellite.getQuarterOrbitMin()
+        var startDate = date
+        var shouldWindBack = true
+        var lastAosDate: Date
+        var count = 0
+        if (satellite.willBeSeen(stationPos)) {
+            if (satellite.params.isDeepspace) {
+                passes.add(nextDeepSpacePass(satellite, stationPos, date))
+            } else {
+                do {
+                    if (count > 0) shouldWindBack = false
+                    val pass = nextNearEarthPass(satellite, stationPos, startDate, shouldWindBack)
+                    lastAosDate = Date(pass.aosTime)
+                    passes.add(pass)
+                    startDate = Date(pass.losTime + (quarterOrbitMin * 3) * 60L * 1000L)
+                    count++
+                } while (lastAosDate < endDate)
+            }
+        }
+        return passes
+    }
+
+    private fun filterPasses(
+        passes: List<SatPass>,
+        refDate: Date,
+        hoursAhead: Int = 8,
+        minElevation: Double = 16.0
+    ): List<SatPass> {
+        val timeFuture = refDate.time + (hoursAhead * 3600 * 1000)
+        return passes.filter { it.losTime > refDate.time }
+            .filter { it.aosTime < timeFuture }
+            .filter { it.maxElevation > minElevation }
+            .sortedBy { it.aosTime }
+    }
+
+    private fun nextDeepSpacePass(
+        satellite: Satellite,
+        stationPos: StationPos,
+        refDate: Date
+    ): SatPass {
+        val satPos = satellite.getPosition(stationPos, refDate.time)
+        val aos = Date(refDate.time - 24 * 60L * 60L * 1000L).time
+        val los = Date(refDate.time + 24 * 60L * 60L * 1000L).time
+        val tca = Date((aos + los) / 2).time
+        val az = Math.toDegrees(satPos.azimuth)
+        val elev = Math.toDegrees(satPos.elevation)
+        val alt = satPos.altitude
+        return SatPass(aos, az, los, az, tca, az, alt, elev, satellite)
+    }
+
+    private fun nextNearEarthPass(
+        satellite: Satellite,
+        stationPos: StationPos,
+        refDate: Date,
+        windBack: Boolean = false
+    ): SatPass {
+        val calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
+            clear()
+            timeInMillis = refDate.time
+        }
+        val quarterOrbitMin = satellite.getQuarterOrbitMin()
+
+        var elevation: Double
+        var maxElevation = 0.0
+        var alt = 0.0
+        var tcaAz = 0.0
+
+        // wind back time 1/4 of an orbit
+        if (windBack) calendar.add(Calendar.MINUTE, -quarterOrbitMin)
+        var satPos = satellite.getPosition(stationPos, calendar.time.time)
+
+        if (satPos.elevation > 0.0) {
+            // move forward in 30 second intervals until the sat goes below the horizon
+            do {
+                calendar.add(Calendar.SECOND, 30)
+                satPos = satellite.getPosition(stationPos, calendar.time.time)
+            } while (satPos.elevation > 0.0)
+            // move forward 3/4 of an orbit
+            calendar.add(Calendar.MINUTE, quarterOrbitMin * 3)
+        }
+
+        // find the next time sat comes above the horizon
+        do {
+            calendar.add(Calendar.SECOND, 60)
+            satPos = satellite.getPosition(stationPos, calendar.time.time)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation < 0.0)
+
+        // refine to 3 seconds
+        calendar.add(Calendar.SECOND, -60)
+        do {
+            calendar.add(Calendar.SECOND, 3)
+            satPos = satellite.getPosition(stationPos, calendar.time.time)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation < 0.0)
+
+        val aos = satPos.time
+        val aosAz = Math.toDegrees(satPos.azimuth)
+
+        // find when sat goes below
+        do {
+            calendar.add(Calendar.SECOND, 30)
+            satPos = satellite.getPosition(stationPos, calendar.time.time)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation > 0.0)
+
+        // refine to 3 seconds
+        calendar.add(Calendar.SECOND, -30)
+        do {
+            calendar.add(Calendar.SECOND, 3)
+            satPos = satellite.getPosition(stationPos, calendar.time.time)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation > 0.0)
+
+        val los = satPos.time
+        val losAz = Math.toDegrees(satPos.azimuth)
+        val tca = Date((aos + los) / 2).time
+        val elev = Math.toDegrees(maxElevation)
+        return SatPass(aos, aosAz, los, losAz, tca, tcaAz, alt, elev, satellite)
+    }
+}

core/src/main/java/com/rtbishop/look4sat/data/PreferencesSource.kt

@@ -17,7 +17,7 @@
  */
 package com.rtbishop.look4sat.data
 
-import com.rtbishop.look4sat.domain.predict4kotlin.StationPos
+import com.rtbishop.look4sat.domain.StationPos
 
 interface PreferencesSource {
 

core/src/main/java/com/rtbishop/look4sat/data/RemoteDataSource.kt

@@ -17,10 +17,10 @@
  */
 package com.rtbishop.look4sat.data
 
-import com.rtbishop.look4sat.domain.model.SatTrans
+import com.rtbishop.look4sat.domain.SatTrans
 import java.io.InputStream
 
-interface SatDataRemoteSource {
+interface RemoteDataSource {
 
     suspend fun fetchDataStream(url: String): InputStream?
 

core/src/main/java/com/rtbishop/look4sat/data/SatPassRepository.kt

@@ -1,71 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2021 Arty Bishop (bishop.arty@gmail.com)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.data
-
-import com.rtbishop.look4sat.domain.predict4kotlin.SatPass
-import com.rtbishop.look4sat.domain.predict4kotlin.Satellite
-import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.flow.MutableSharedFlow
-import kotlinx.coroutines.flow.SharedFlow
-import kotlinx.coroutines.withContext
-import java.util.*
-
-class SatPassRepository(
-    private val preferencesSource: PreferencesSource,
-    private val defaultDispatcher: CoroutineDispatcher
-) {
-    private val _passes = MutableSharedFlow<List<SatPass>>(replay = 1)
-    private var selectedSatellites = emptyList<Satellite>()
-    val passes: SharedFlow<List<SatPass>> = _passes
-
-    suspend fun triggerCalculation(satellites: List<Satellite>, refDate: Date = Date()) {
-        if (satellites.isEmpty()) {
-            _passes.emit(emptyList())
-        } else {
-            val oldCatNums = selectedSatellites.map { it.params.catnum }
-            val newCatNums = satellites.map { it.params.catnum }
-            if (oldCatNums != newCatNums) forceCalculation(satellites, refDate)
-        }
-    }
-
-    suspend fun forceCalculation(satellites: List<Satellite>, refDate: Date = Date()) {
-        if (satellites.isEmpty()) {
-            _passes.emit(emptyList())
-        } else {
-            withContext(defaultDispatcher) {
-                val allPasses = mutableListOf<SatPass>()
-                selectedSatellites = satellites
-                satellites.forEach { satellite -> allPasses.addAll(getPasses(satellite, refDate)) }
-                _passes.emit(filterPasses(allPasses, refDate))
-            }
-        }
-    }
-
-    private fun getPasses(satellite: Satellite, refDate: Date): List<SatPass> {
-        val predictor = satellite.getPredictor(preferencesSource.loadStationPosition())
-        return predictor.getPasses(refDate, preferencesSource.getHoursAhead(), true)
-    }
-
-    private fun filterPasses(passes: List<SatPass>, refDate: Date): List<SatPass> {
-        val timeFuture = refDate.time + (preferencesSource.getHoursAhead() * 3600 * 1000)
-        return passes.filter { it.losTime > refDate.time }
-            .filter { it.aosTime < timeFuture }
-            .filter { it.maxElevation > preferencesSource.getMinElevation() }
-            .sortedBy { it.aosTime }
-    }
-}

core/src/main/java/com/rtbishop/look4sat/data/SatPredictor.kt

@@ -1,86 +0,0 @@
-package com.rtbishop.look4sat.data
-
-import com.rtbishop.look4sat.domain.predict4kotlin.*
-import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.flow.MutableSharedFlow
-import kotlinx.coroutines.flow.SharedFlow
-import kotlinx.coroutines.withContext
-import java.util.*
-
-class SatPredictor(
-    private val preferencesSource: PreferencesSource,
-    private val defaultDispatcher: CoroutineDispatcher
-) {
-    // Multi Sat passes
-    private val _passes = MutableSharedFlow<List<SatPass>>(replay = 1)
-    private var selectedSatellites = emptyList<Satellite>()
-    val passes: SharedFlow<List<SatPass>> = _passes
-
-    suspend fun triggerCalculation(satellites: List<Satellite>, refDate: Date = Date()) {
-        if (satellites.isEmpty()) {
-            _passes.emit(emptyList())
-        } else {
-            val oldCatNums = selectedSatellites.map { it.params.catnum }
-            val newCatNums = satellites.map { it.params.catnum }
-            if (oldCatNums != newCatNums) forceCalculation(satellites, refDate)
-        }
-    }
-
-    suspend fun forceCalculation(satellites: List<Satellite>, refDate: Date = Date()) {
-        if (satellites.isEmpty()) {
-            _passes.emit(emptyList())
-        } else {
-            withContext(defaultDispatcher) {
-                val allPasses = mutableListOf<SatPass>()
-                selectedSatellites = satellites
-                satellites.forEach { satellite -> allPasses.addAll(getPasses(satellite, refDate)) }
-                _passes.emit(filterPasses(allPasses, refDate))
-            }
-        }
-    }
-
-    private fun getPasses(satellite: Satellite, refDate: Date): List<SatPass> {
-        val predictor = satellite.getPredictor(preferencesSource.loadStationPosition())
-        return predictor.getPasses(refDate, preferencesSource.getHoursAhead(), true)
-    }
-
-    private fun filterPasses(passes: List<SatPass>, refDate: Date): List<SatPass> {
-        val timeFuture = refDate.time + (preferencesSource.getHoursAhead() * 3600 * 1000)
-        return passes.filter { it.losTime > refDate.time }
-            .filter { it.aosTime < timeFuture }
-            .filter { it.maxElevation > preferencesSource.getMinElevation() }
-            .sortedBy { it.aosTime }
-    }
-
-    // Single Sat radar
-
-    // Constant calculation of beacon Az/El point
-    private val _beaconPoint = MutableSharedFlow<SkyPos>(replay = 1)
-    val beaconPoint: SharedFlow<SkyPos> = _beaconPoint
-
-    suspend fun calculateSatBeacon(satPass: SatPass, stationPos: StationPos, date: Date) {
-        withContext(defaultDispatcher) {
-            val satPos = satPass.satellite.getPosition(stationPos, date)
-            _beaconPoint.emit(SkyPos(satPos.azimuth, satPos.elevation))
-        }
-    }
-
-    // Single calculation of beacon Az/El points list
-    private val _trajectoryPoints = MutableSharedFlow<List<SkyPos>>(replay = 1)
-    val trajectoryPoints: SharedFlow<List<SkyPos>> = _trajectoryPoints
-
-    suspend fun calculateSatTrajectory(satPass: SatPass, stationPos: StationPos) {
-        withContext(defaultDispatcher) {
-            val trajectoryPoints = mutableListOf<SkyPos>()
-            var currentTime = satPass.aosTime
-            while (currentTime < satPass.losTime) {
-                val satPos = satPass.satellite.getPosition(stationPos, Date(currentTime))
-                trajectoryPoints.add(SkyPos(satPos.azimuth, satPos.elevation))
-                currentTime += 15000
-            }
-            _trajectoryPoints.emit(trajectoryPoints)
-        }
-    }
-
-    // Multi Sat map
-}

core/src/main/java/com/rtbishop/look4sat/data/SatelliteRepo.kt

@@ -17,11 +17,11 @@
  */
 package com.rtbishop.look4sat.data
 
-import com.rtbishop.look4sat.domain.model.SatEntry
-import com.rtbishop.look4sat.domain.model.SatItem
-import com.rtbishop.look4sat.domain.model.SatTrans
-import com.rtbishop.look4sat.domain.predict4kotlin.Satellite
-import com.rtbishop.look4sat.domain.predict4kotlin.TLE
+import com.rtbishop.look4sat.domain.SatEntry
+import com.rtbishop.look4sat.domain.SatItem
+import com.rtbishop.look4sat.domain.SatTrans
+import com.rtbishop.look4sat.domain.Satellite
+import com.rtbishop.look4sat.domain.TLE
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.flow.Flow
@@ -30,10 +30,10 @@ import kotlinx.coroutines.withContext
 import java.io.InputStream
 import java.util.zip.ZipInputStream
 
-class SatDataRepository(
+class SatelliteRepo(
     private val preferencesSource: PreferencesSource,
-    private val satLocalSource: SatDataLocalSource,
-    private val satRemoteSource: SatDataRemoteSource,
+    private val localDataSource: LocalDataSource,
+    private val remoteDataSource: RemoteDataSource,
     private val ioDispatcher: CoroutineDispatcher
 ) {
 
@@ -46,19 +46,19 @@ class SatDataRepository(
     }
 
     fun getSatItems(): Flow<List<SatItem>> {
-        return satLocalSource.getSatItems()
+        return localDataSource.getSatItems()
     }
 
     fun getSatTransmitters(catNum: Int): Flow<List<SatTrans>> {
-        return satLocalSource.getSatTransmitters(catNum)
+        return localDataSource.getSatTransmitters(catNum)
     }
 
     suspend fun getSelectedSatellites(): List<Satellite> {
-        return satLocalSource.getSelectedSatellites()
+        return localDataSource.getSelectedSatellites()
     }
 
     suspend fun updateEntriesFromFile(stream: InputStream) = withContext(ioDispatcher) {
-        satLocalSource.updateEntries(importSatEntries(stream))
+        localDataSource.updateEntries(importSatEntries(stream))
     }
 
     suspend fun updateEntriesFromWeb(sources: List<String>) {
@@ -67,7 +67,7 @@ class SatDataRepository(
                 val streams = mutableListOf<InputStream>()
                 val entries = mutableListOf<SatEntry>()
                 sources.forEach { source ->
-                    satRemoteSource.fetchDataStream(source)?.let { stream ->
+                    remoteDataSource.fetchDataStream(source)?.let { stream ->
                         if (source.contains(".zip", true)) {
                             val zipStream = ZipInputStream(stream).apply { nextEntry }
                             streams.add(zipStream)
@@ -77,17 +77,17 @@ class SatDataRepository(
                     }
                 }
                 streams.forEach { stream -> entries.addAll(importSatEntries(stream)) }
-                satLocalSource.updateEntries(entries)
+                localDataSource.updateEntries(entries)
             }
             launch(ioDispatcher) {
-                val transmitters = satRemoteSource.fetchTransmitters().filter { it.isAlive }
-                satLocalSource.updateTransmitters(transmitters)
+                val transmitters = remoteDataSource.fetchTransmitters().filter { it.isAlive }
+                localDataSource.updateTransmitters(transmitters)
             }
         }
     }
 
     suspend fun updateEntriesSelection(catNums: List<Int>, isSelected: Boolean) {
-        satLocalSource.updateEntriesSelection(catNums, isSelected)
+        localDataSource.updateEntriesSelection(catNums, isSelected)
     }
 
     private fun importSatEntries(stream: InputStream): List<SatEntry> {

core/src/main/java/com/rtbishop/look4sat/domain/DeepSpaceSat.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 import kotlin.math.*
 

core/src/main/java/com/rtbishop/look4sat/domain/GeoPos.kt

@@ -15,6 +15,6 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 data class GeoPos(val latitude: Double, val longitude: Double)

core/src/main/java/com/rtbishop/look4sat/domain/NearEarthSat.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 import kotlin.math.*
 

core/src/main/java/com/rtbishop/look4sat/domain/QthConverter.kt

@@ -15,11 +15,11 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 import kotlin.math.round
 
-class QthConverter {
+object QthConverter {
 
     fun qthToPosition(qthString: String): GeoPos? {
         val trimmedQth = qthString.take(6)

core/src/main/java/com/rtbishop/look4sat/domain/SatData.kt

@@ -0,0 +1,29 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2021 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain
+
+data class SatData(
+    val pass: Satellite,
+    val catNum: Int,
+    val name: String,
+    val range: Double,
+    val altitude: Double,
+    val velocity: Double,
+    val qthLoc: String,
+    val osmPos: GeoPos
+)

core/src/main/java/com/rtbishop/look4sat/domain/SatEntry.kt

@@ -15,9 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.model
-
-import com.rtbishop.look4sat.domain.predict4kotlin.TLE
+package com.rtbishop.look4sat.domain
 
 data class SatEntry(
     val tle: TLE,

core/src/main/java/com/rtbishop/look4sat/domain/SatItem.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.model
+package com.rtbishop.look4sat.domain
 
 data class SatItem(
     val catNum: Int,

core/src/main/java/com/rtbishop/look4sat/domain/SatPass.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 data class SatPass(
     val aosTime: Long,
@@ -26,8 +26,7 @@ data class SatPass(
     val tcaAzimuth: Double,
     val altitude: Double,
     val maxElevation: Double,
-    val satellite: Satellite,
-    val predictor: PassPredictor,
+    val satellite: Satellite
 ) {
     val catNum: Int = satellite.params.catnum
     val name: String = satellite.params.name

core/src/main/java/com/rtbishop/look4sat/domain/SatPos.kt

@@ -15,9 +15,8 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
-import java.util.*
 import kotlin.math.*
 
 data class SatPos(
@@ -29,7 +28,7 @@ data class SatPos(
     var range: Double = 0.0,
     var rangeRate: Double = 0.0,
     var theta: Double = 0.0,
-    var time: Date = Date()
+    var time: Long = 0L
 ) {
     private val earthRadiusKm = 6378.16
     private val speedOfLight = 2.99792458E8

core/src/main/java/com/rtbishop/look4sat/domain/SatTrans.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.model
+package com.rtbishop.look4sat.domain
 
 data class SatTrans(
     val uuid: String,

core/src/main/java/com/rtbishop/look4sat/domain/Satellite.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 import java.util.*
 import java.util.concurrent.atomic.AtomicReference
@@ -41,6 +41,10 @@ abstract class Satellite(val params: TLE) {
     var s4 = 0.0
     val xke = 7.43669161E-2
 
+    fun getQuarterOrbitMin(): Int {
+        return (24.0 * 60.0 / params.meanmo / 4.0).toInt()
+    }
+
     fun willBeSeen(pos: StationPos): Boolean {
         return if (params.meanmo < 1e-8) false else {
             var lin = params.incl
@@ -51,11 +55,7 @@ abstract class Satellite(val params: TLE) {
         }
     }
 
-    fun getPredictor(pos: StationPos): PassPredictor {
-        return PassPredictor(this, pos)
-    }
-
-    fun getPosition(pos: StationPos, time: Date): SatPos {
+    fun getPosition(pos: StationPos, time: Long): SatPos {
         val satPos = SatPos()
         // Date/time at which the position and velocity were calculated
         val julUTC = calcCurrentDaynum(time) + 2444238.5
@@ -76,8 +76,7 @@ abstract class Satellite(val params: TLE) {
     }
 
     // Read the system clock and return the number of days since 31Dec79 00:00:00 UTC (daynum 0)
-    private fun calcCurrentDaynum(date: Date): Double {
-        val now = date.time
+    private fun calcCurrentDaynum(now: Long): Double {
         val sgp4Epoch = Calendar.getInstance(TimeZone.getTimeZone("UTC:UTC"))
         sgp4Epoch.clear()
         sgp4Epoch[1979, 11, 31, 0, 0] = 0

core/src/main/java/com/rtbishop/look4sat/domain/StationPos.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 data class StationPos(
     val latitude: Double,

core/src/main/java/com/rtbishop/look4sat/domain/TLE.kt

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-package com.rtbishop.look4sat.domain.predict4kotlin
+package com.rtbishop.look4sat.domain
 
 import java.io.InputStream
 import kotlin.math.pow

core/src/main/java/com/rtbishop/look4sat/domain/predict4kotlin/PassPredictor.kt

@@ -1,173 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2021 Arty Bishop (bishop.arty@gmail.com)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.domain.predict4kotlin
-
-import java.util.*
-
-class PassPredictor(private val satellite: Satellite, private val stationPos: StationPos) {
-
-    private val oneQuarterOrbitMin = (24.0 * 60.0 / satellite.params.meanmo / 4.0).toInt()
-    private val speedOfLight = 2.99792458E8
-
-    fun getDownlinkFreq(freq: Long, date: Date): Long {
-        val rangeRate = getSatPos(date).rangeRate
-        return (freq.toDouble() * (speedOfLight - rangeRate * 1000.0) / speedOfLight).toLong()
-    }
-
-    fun getUplinkFreq(freq: Long, date: Date): Long {
-        val rangeRate = getSatPos(date).rangeRate
-        return (freq.toDouble() * (speedOfLight + rangeRate * 1000.0) / speedOfLight).toLong()
-    }
-
-    fun getSatPos(date: Date): SatPos {
-        return satellite.getPosition(stationPos, date)
-    }
-
-    fun getPositions(refDate: Date, stepSec: Int, minBefore: Int, orbits: Double): List<SatPos> {
-        val positions = mutableListOf<SatPos>()
-        val orbitalPeriod = 24 * 60 / satellite.params.meanmo
-        val endDate = Date(refDate.time + (orbitalPeriod * orbits * 60L * 1000L).toLong())
-        val startDate = Date(refDate.time - minBefore * 60L * 1000L)
-        var currentDate = startDate
-        while (currentDate.before(endDate)) {
-            positions.add(getSatPos(currentDate))
-            currentDate = Date(currentDate.time + stepSec * 1000)
-        }
-        return positions
-    }
-
-    fun getPasses(refDate: Date, hoursAhead: Int, windBack: Boolean): List<SatPass> {
-        val passes = mutableListOf<SatPass>()
-        val endDate = Date(refDate.time + hoursAhead * 60L * 60L * 1000L)
-        var startDate = refDate
-        var shouldWindBack = windBack
-        var lastAosDate: Date
-        var count = 0
-        if (satellite.willBeSeen(stationPos)) {
-            if (satellite.params.isDeepspace) {
-                passes.add(nextDeepSpacePass(refDate))
-            } else {
-                do {
-                    if (count > 0) shouldWindBack = false
-                    val pass = nextNearEarthPass(startDate, shouldWindBack)
-                    lastAosDate = Date(pass.aosTime)
-                    passes.add(pass)
-                    startDate = Date(pass.losTime + (oneQuarterOrbitMin * 3) * 60L * 1000L)
-                    count++
-                } while (lastAosDate < endDate)
-            }
-        }
-        return passes
-    }
-
-    private fun nextDeepSpacePass(refDate: Date): SatPass {
-        val satPos = getSatPos(refDate)
-        val aos = Date(refDate.time - 24 * 60L * 60L * 1000L).time
-        val los = Date(refDate.time + 24 * 60L * 60L * 1000L).time
-        val tca = Date((aos + los) / 2).time
-        val az = Math.toDegrees(satPos.azimuth)
-        val elev = Math.toDegrees(satPos.elevation)
-        val alt = satPos.altitude
-        return SatPass(aos, az, los, az, tca, az, alt, elev, satellite, this)
-    }
-
-    private fun nextNearEarthPass(refDate: Date, windBack: Boolean = false): SatPass {
-        val calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
-            clear()
-            timeInMillis = refDate.time
-        }
-
-        var elevation: Double
-        var maxElevation = 0.0
-        var alt = 0.0
-        var tcaAz = 0.0
-
-        // wind back time 1/4 of an orbit
-        if (windBack) calendar.add(Calendar.MINUTE, -oneQuarterOrbitMin)
-        var satPos = getSatPos(calendar.time)
-
-        if (satPos.elevation > 0.0) {
-            // move forward in 30 second intervals until the sat goes below the horizon
-            do {
-                calendar.add(Calendar.SECOND, 30)
-                satPos = getSatPos(calendar.time)
-            } while (satPos.elevation > 0.0)
-            // move forward 3/4 of an orbit
-            calendar.add(Calendar.MINUTE, oneQuarterOrbitMin * 3)
-        }
-
-        // find the next time sat comes above the horizon
-        do {
-            calendar.add(Calendar.SECOND, 60)
-            satPos = getSatPos(calendar.time)
-            elevation = satPos.elevation
-            if (elevation > maxElevation) {
-                maxElevation = elevation
-                alt = satPos.altitude
-                tcaAz = Math.toDegrees(satPos.azimuth)
-            }
-        } while (satPos.elevation < 0.0)
-
-        // refine to 3 seconds
-        calendar.add(Calendar.SECOND, -60)
-        do {
-            calendar.add(Calendar.SECOND, 3)
-            satPos = getSatPos(calendar.time)
-            elevation = satPos.elevation
-            if (elevation > maxElevation) {
-                maxElevation = elevation
-                alt = satPos.altitude
-                tcaAz = Math.toDegrees(satPos.azimuth)
-            }
-        } while (satPos.elevation < 0.0)
-
-        val aos = satPos.time.time
-        val aosAz = Math.toDegrees(satPos.azimuth)
-
-        // find when sat goes below
-        do {
-            calendar.add(Calendar.SECOND, 30)
-            satPos = getSatPos(calendar.time)
-            elevation = satPos.elevation
-            if (elevation > maxElevation) {
-                maxElevation = elevation
-                alt = satPos.altitude
-                tcaAz = Math.toDegrees(satPos.azimuth)
-            }
-        } while (satPos.elevation > 0.0)
-
-        // refine to 3 seconds
-        calendar.add(Calendar.SECOND, -30)
-        do {
-            calendar.add(Calendar.SECOND, 3)
-            satPos = getSatPos(calendar.time)
-            elevation = satPos.elevation
-            if (elevation > maxElevation) {
-                maxElevation = elevation
-                alt = satPos.altitude
-                tcaAz = Math.toDegrees(satPos.azimuth)
-            }
-        } while (satPos.elevation > 0.0)
-
-        val los = satPos.time.time
-        val losAz = Math.toDegrees(satPos.azimuth)
-        val tca = Date((aos + los) / 2).time
-        val elev = Math.toDegrees(maxElevation)
-        return SatPass(aos, aosAz, los, losAz, tca, tcaAz, alt, elev, satellite, this)
-    }
-}

core/src/main/java/com/rtbishop/look4sat/domain/predict4kotlin/SkyPos.kt

@@ -1,20 +0,0 @@
-/*
- * Look4Sat. Amateur radio satellite tracker and pass predictor.
- * Copyright (C) 2019-2021 Arty Bishop (bishop.arty@gmail.com)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-package com.rtbishop.look4sat.domain.predict4kotlin
-
-data class SkyPos(val azimuth: Double, val elevation: Double)

core/src/test/java/com/rtbishop/look4sat/Look4SatTest.kt

@@ -1,6 +1,6 @@
 package com.rtbishop.look4sat
 
-import com.rtbishop.look4sat.domain.predict4kotlin.TLE
+import com.rtbishop.look4sat.domain.TLE
 import org.junit.Test
 
 class Look4SatTest {

core/src/test/java/com/rtbishop/look4sat/QthConverterTest.kt

@@ -17,44 +17,42 @@
  */
 package com.rtbishop.look4sat
 
-import com.rtbishop.look4sat.domain.predict4kotlin.QthConverter
+import com.rtbishop.look4sat.domain.QthConverter
 import org.junit.Test
 
 class QthConverterTest {
 
-    private val qthConverter = QthConverter()
-
     @Test
     fun `Given valid QTH returns correct POS`() {
-        var result = qthConverter.qthToPosition("io91VL39FX")
+        var result = QthConverter.qthToPosition("io91VL39FX")
         assert(result?.latitude == 51.4792 && result.longitude == -0.2083)
-        result = qthConverter.qthToPosition("JN58TD")
+        result = QthConverter.qthToPosition("JN58TD")
         assert(result?.latitude == 48.1458 && result.longitude == 11.6250)
-        result = qthConverter.qthToPosition("gf15vc")
+        result = QthConverter.qthToPosition("gf15vc")
         assert(result?.latitude == -34.8958 && result.longitude == -56.2083)
-        result = qthConverter.qthToPosition("fm18LW")
+        result = QthConverter.qthToPosition("fm18LW")
         assert(result?.latitude == 38.9375 && result.longitude == -77.0417)
     }
 
     @Test
     fun `Given invalid QTH returns null`() {
-        var result = qthConverter.qthToPosition("ZZ00zz")
+        var result = QthConverter.qthToPosition("ZZ00zz")
         assert(result == null)
-        result = qthConverter.qthToPosition("JN58tz")
+        result = QthConverter.qthToPosition("JN58tz")
         assert(result == null)
     }
 
     @Test
     fun `Given valid POS returns correct QTH`() {
-        assert(qthConverter.positionToQTH(51.4878, -0.2146) == "IO91vl")
-        assert(qthConverter.positionToQTH(48.1466, 11.6083) == "JN58td")
-        assert(qthConverter.positionToQTH(-34.91, -56.2116) == "GF15vc")
-        assert(qthConverter.positionToQTH(38.92, -77.065) == "FM18lw")
+        assert(QthConverter.positionToQTH(51.4878, -0.2146) == "IO91vl")
+        assert(QthConverter.positionToQTH(48.1466, 11.6083) == "JN58td")
+        assert(QthConverter.positionToQTH(-34.91, -56.2116) == "GF15vc")
+        assert(QthConverter.positionToQTH(38.92, -77.065) == "FM18lw")
     }
 
     @Test
     fun `Given invalid POS returns null`() {
-        assert(qthConverter.positionToQTH(91.0542, -170.1142) == null)
-        assert(qthConverter.positionToQTH(89.0542, -240.1142) == null)
+        assert(QthConverter.positionToQTH(91.0542, -170.1142) == null)
+        assert(QthConverter.positionToQTH(89.0542, -240.1142) == null)
     }
 }