Added Spiral class

- Spiral class to create spirals around a coordinate

.gitignore

@@ -0,0 +1,6 @@
+gradle
+.gradle
+.idea
+build
+out
+gradlew*

build.gradle

@@ -0,0 +1,49 @@
+
+plugins {
+    id 'idea'
+    id 'org.jetbrains.kotlin.jvm' version '1.3.50'
+    id 'com.github.johnrengelman.shadow' version '2.0.4'
+}
+
+idea {
+    module {
+        downloadJavadoc = true
+        downloadSources = true
+    }
+}
+
+group "net.trivernis"
+version "1.0-SNAPSHOT"
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+    maven {
+        url "https://hub.spigotmc.org/nexus/content/repositories/snapshots"
+    }
+    maven {
+        url 'https://papermc.io/repo/repository/maven-public/'
+    }
+}
+
+dependencies {
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+    compileOnly "org.spigotmc:spigot-api:1.14.4-R0.1-SNAPSHOT"
+}
+
+jar {
+    from configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
+}
+compileKotlin {
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+compileTestKotlin {
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}

gradle.properties

@@ -0,0 +1 @@
+kotlin.code.style=official

settings.gradle

@@ -0,0 +1,2 @@
+rootProject.name = 'chunkmaster'
+

src/main/kotlin/net/trivernis/chunkmaster/Chunkmaster.kt

@@ -0,0 +1,18 @@
+package net.trivernis.chunkmaster
+
+import net.trivernis.chunkmaster.lib.Spiral
+import org.bukkit.plugin.java.JavaPlugin
+
+class Chunkmaster: JavaPlugin() {
+    override fun onEnable() {
+        configure()
+    }
+
+    override fun onDisable() {
+
+    }
+
+    private fun configure() {
+        config.options().copyDefaults(true)
+    }
+}

src/main/kotlin/net/trivernis/chunkmaster/lib/Spiral.kt

@@ -0,0 +1,56 @@
+package net.trivernis.chunkmaster.lib
+
+import kotlin.math.abs
+
+class Spiral(private val center: Pair<Int, Int>, private val start: Pair<Int, Int>) {
+    var currentPos = start
+    var direction = 0
+    var count = 0
+
+    /**
+     * Returns the next value in the spiral
+     */
+    fun next(): Pair<Int, Int> {
+        if (count == 1) {   // because of the center behaviour
+            count ++
+            return currentPos
+        }
+        if (currentPos == center) { // the center has to be handled exclusively
+            currentPos = Pair(center.first, center.second + 1)
+            count ++
+            return center
+        } else {
+            val distances = getDistances(center, currentPos)
+            if (abs(distances.first) == abs(distances.second)) {
+                    direction = (direction + 1)%5
+                }
+            }
+        when(direction) {
+            0 -> {
+                currentPos = Pair(currentPos.first + 1, currentPos.second)
+            }
+            1 -> {
+                currentPos = Pair(currentPos.first, currentPos.second - 1)
+            }
+            2 -> {
+                currentPos = Pair(currentPos.first - 1, currentPos.second)
+            }
+            3 -> {
+                currentPos = Pair(currentPos.first, currentPos.second + 1)
+            }
+            4 -> {
+                currentPos = Pair(currentPos.first, currentPos.second + 1)
+                direction = 0
+            }
+        }
+        count ++
+        return currentPos
+    }
+
+    /**
+     * Returns the distances between 2 coordinates
+     */
+    private fun getDistances(pos1: Pair<Int, Int>, pos2: Pair<Int, Int>): Pair<Int, Int> {
+        return Pair(pos2.first - pos1.first, pos2.second - pos1.second)
+    }
+}

src/main/resources/plugin.yml

@@ -0,0 +1,12 @@
+main: net.trivernis.chunkmaster.Chunkmaster
+name: Chunkmaster
+version: '1.0 SNAPSHOT'
+description: Chunk commands plugin.
+author: Trivernis
+website: trivernis.net
+commands:
+
+permissions:
+  chunkmaster.*:
+    description: Wildcard permission
+    default: op