make serializable, bump version

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.2.20'
+    ext.kotlin_version = '1.2.41'
     ext.dokka_version = '0.9.14'
 
     repositories {
@@ -21,7 +21,7 @@ plugins {
 }
 
 group 'com.github.sanity'
-version '1.4.13'
+version '1.4.15'
 
 apply plugin: 'java'
 apply plugin: 'kotlin'

src/main/kotlin/com/github/sanity/pav/spline/MonotoneSpline.kt

@@ -2,6 +2,7 @@ package com.github.sanity.pav.spline
 
 import com.github.sanity.pav.*
 import com.github.sanity.pav.spline.MonotoneSpline.ExtrapolationStrategy.*
+import java.io.Serializable
 import java.util.*
 
 /**
@@ -19,7 +20,7 @@ import java.util.*
  * @throws IllegalArgumentException if the control points are not monotonic.
 */
 
-class MonotoneSpline @JvmOverloads constructor(inputPoints: List<Point>, tangentStrategy: TangentStrategy = FritschCarlsonTangentStrategy()) {
+class MonotoneSpline @JvmOverloads constructor(inputPoints: List<Point>, tangentStrategy: TangentStrategy = FritschCarlsonTangentStrategy()) : Serializable {
 
     private val minimumXDistance = 0.000001
 

src/main/kotlin/com/github/sanity/pav/spline/TangentStrategy.kt

@@ -1,19 +1,20 @@
 package com.github.sanity.pav.spline
 
 import com.github.sanity.pav.Point
+import java.io.Serializable
 import java.util.*
 
 interface TangentStrategy {
     fun compute(points: Iterable<PointWithSecants>): ArrayList<PointWithTangents>
 }
 
-data class PointWithTangents(val pointWithSecants: PointWithSecants, val tangent: Double) {
+data class PointWithTangents(val pointWithSecants: PointWithSecants, val tangent: Double) : Serializable {
     val x = pointWithSecants.point.x
     val y = pointWithSecants.point.y
 }
 
-data class PointWithSecants(val point: Point, val secantBefore: Secant?, val secantAfter: Secant?)
+data class PointWithSecants(val point: Point, val secantBefore: Secant?, val secantAfter: Secant?) : Serializable
 
-data class Secant(val slope: Double) {
+data class Secant(val slope: Double) : Serializable {
     constructor(start: Point, end: Point) : this((end.y - start.y) / (end.x - start.x))
 }