initial commit

core/build.gradle.kts

@@ -0,0 +1,96 @@
+import java.util.Properties
+
+plugins {
+    alias(libs.plugins.dokka)
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.maven.publish)
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(kotlin("test"))
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+kotlin {
+    jvmToolchain(21)
+}
+val javadocJar by tasks.register<Jar>("dokkaJavadocJar") {
+    dependsOn(tasks.dokkaJavadoc)
+    from(tasks.dokkaJavadoc.flatMap { it.outputDirectory })
+    archiveClassifier.set("javadoc")
+}
+
+val sourcesJar by tasks.register<Jar>("sourcesJar") {
+    from(sourceSets.main.get().allSource)
+    archiveClassifier.set("sources")
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            groupId = rootProject.group.toString()
+            artifactId = "distance"
+            version = rootProject.version.toString()
+            from(components["java"])
+            artifact(javadocJar)
+            artifact(sourcesJar)
+        }
+    }
+    repositories {
+        val secretFile = rootProject.file("secret.properties")
+        if (secretFile.exists()) {
+            val secret = Properties()
+            secretFile.inputStream().also { secret.load(it) }
+
+            val mavenUrl = secret["neuon.maven.url"] as? String
+            val mavenUsername = secret["neuon.maven.username"] as? String
+            val mavenPassword = secret["neuon.maven.password"] as? String
+
+            if (mavenUrl != null && mavenUsername != null && mavenPassword != null) {
+                maven {
+                    requireNotNull(mavenUrl) {
+                        "neuon.maven.url is missing from secret.properties"
+                    }
+                    requireNotNull(mavenUsername) {
+                        "neuon.maven.username is missing from secret.properties"
+                    }
+                    requireNotNull(mavenPassword) {
+                        "neuon.maven.password is missing from secret.properties"
+                    }
+                    name = "neuon"
+                    url = uri(mavenUrl)
+
+                    credentials(PasswordCredentials::class) {
+                        username = mavenUsername
+                        password = mavenPassword
+                    }
+                }
+            } else {
+                val list = listOfNotNull(
+                    "neuon.maven.url".takeIf { mavenUrl == null },
+                    "neuon.maven.username".takeIf { mavenUsername == null },
+                    "neuon.maven.password".takeIf { mavenPassword == null },
+                )
+                val message = buildString {
+                    append("Missing Maven publication in secret.properties: ")
+                    append(list.joinToString())
+                    append(". Ignore this if you don't plan on publishing this library")
+                }
+
+                logger.error(message)
+            }
+        } else {
+            logger.error(
+                buildString {
+                    append("Missing secret.properties. Ignore this if you don't plan on publishing this library")
+                },
+            )
+        }
+    }
+}

core/src/main/kotlin/ai/neuon/utility/distance/Distance.kt

@@ -0,0 +1,29 @@
+package ai.neuon.utility.distance
+
+import kotlin.math.abs
+import kotlin.math.asin
+import kotlin.math.cos
+import kotlin.math.sin
+import kotlin.math.sqrt
+
+object Distance {
+    /**
+     * @return distance between two points in kilometre
+     */
+    fun measure2Points(lat1: Double, lng1: Double, lat2: Double, lng2: Double): Double {
+        val radius = 6371.071 // Earth's radius, in km
+        val radLat1 = lat1 * Math.PI / 180.0
+        val radLat2 = lat2 * Math.PI / 180.0
+        val diffLat = radLat2 - radLat1
+        val diffLng = (lng2 - lng1) * Math.PI / 180.0
+
+        val distance = 2.0 * radius * asin(
+            sqrt(
+                sin(diffLat / 2.0) * sin(diffLat / 2.0) + cos(radLat1) * cos(radLat2) * sin(
+                    diffLng / 2.0
+                ) * sin(diffLng / 2.0)
+            )
+        )
+        return abs(distance)
+    }
+}