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Kode program untuk mencari jarak tempuh (Modul Praktikum GIS)
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| import kotlin.math.* | |
| // nilai default radius bumi | |
| const val earthRadiusKm: Double = 6372.8 | |
| // method untuk melakukan perhitungan dengan metode haversine | |
| fun haversine(latDest: Double, longDest: Double, latCurrent: Double, longCurrent: Double): Double { | |
| val dLat = Math.toRadians(latDest - latCurrent) | |
| val dLon = Math.toRadians(longDest - longCurrent) | |
| val originLat = Math.toRadians(latCurrent) | |
| val destinationLat = Math.toRadians(latDest) | |
| val a = sin(dLat / 2).pow(2.toDouble()) + sin(dLon / 2).pow(2.toDouble()) * cos(originLat) * cos(destinationLat) | |
| val c = 2 * asin(sqrt(a)) | |
| return (earthRadiusKm * c) * 1000 | |
| } | |
| fun main() { | |
| val vertexWithCoordinates = mapOf( | |
| "V1" to (-6.984021136912581 to 106.54242422961052), | |
| "V2" to (-6.985831502332914 to 106.54349711310161), | |
| "V3" to (-6.985305087423851 to 106.54417958070525), | |
| "V4" to (-6.984990935926289 to 106.5443190555591) | |
| ) | |
| printResult(vertexWithCoordinates, "V1", "V2") | |
| } | |
| fun printResult(vertex: Map<String, Pair<Double, Double>>, v1: String, v2: String) { | |
| print("$v1 - $v2 : ") | |
| val result = haversine( | |
| latCurrent = vertex[v1]!!.first, | |
| longCurrent = vertex[v1]!!.second, | |
| latDest = vertex[v2]!!.first, | |
| longDest = vertex[v2]!!.second, | |
| ) | |
| print(result) | |
| println() | |
| } |
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