[orx-triangulator] fix .update() methods (#163)

orx-triangulation/build.gradle

@@ -8,10 +8,13 @@ sourceSets {
     }
 }
 
+def useSnapshot = false
+def delaunatorVersion = (useSnapshot) ? "0.4.0-SNAPSHOT" : "1.0.1"
+
 dependencies {
     implementation project(":orx-noise")
 
-    implementation("com.github.ricardomatias:delaunator:1.0.0")
+    implementation("com.github.ricardomatias:delaunator:$delaunatorVersion")
 
     demoImplementation("org.openrndr:openrndr-core:$openrndrVersion")
     demoImplementation("org.openrndr:openrndr-extensions:$openrndrVersion")

orx-triangulation/src/main/kotlin/Delaunay.kt

@@ -59,10 +59,8 @@ class Delaunay(val points: DoubleArray) {
 
     private var delaunator = Delaunator(points)
 
-    val inedges = IntArray(points.size / 2) { -1 }
-    private val hullIndex = IntArray(points.size / 2) { -1 }
-
-    private var collinear = IntArray(points.size / 2) { it }
+    val inedges = IntArray(points.size / 2)
+    private val hullIndex = IntArray(points.size / 2)
 
     var halfedges = delaunator.halfedges
     var hull = delaunator.hull
@@ -82,6 +80,9 @@ class Delaunay(val points: DoubleArray) {
         hull = delaunator.hull
         triangles = delaunator.triangles
 
+        inedges.fill(-1)
+        hullIndex.fill(-1)
+
         // Compute an index from each point to an (arbitrary) incoming halfedge
         // Used to give the first neighbor of each point for this reason,
         // on the hull we give priority to exterior halfedges

orx-triangulation/src/main/kotlin/Voronoi.kt

@@ -37,7 +37,8 @@ THIS SOFTWARE.
  */
 class Voronoi(val delaunay: Delaunay, val bounds: Rectangle) {
     private val _circumcenters = DoubleArray(delaunay.points.size * 2)
-    val circumcenters = _circumcenters.copyOf(delaunay.triangles.size / 3 * 2)
+    lateinit var circumcenters: DoubleArray
+    private set
 
     val vectors = DoubleArray(delaunay.points.size * 2)
 
@@ -55,6 +56,8 @@ class Voronoi(val delaunay: Delaunay, val bounds: Rectangle) {
         val triangles = delaunay.triangles
         val hull = delaunay.hull
 
+        circumcenters = _circumcenters.copyOf(delaunay.triangles.size / 3 * 2)
+
         // Compute circumcenters
         var i = 0
         var j = 0
@@ -160,7 +163,7 @@ class Voronoi(val delaunay: Delaunay, val bounds: Rectangle) {
         val polygon = mutableListOf(Vector2(points[0], points[1]))
         var n = points.size
 
-        while (points[0] == points[n-2] && points[1] == points[n-1] && n > 1) n -= 2
+        while (n > 1 && points[0] == points[n - 2] && points[1] == points[n - 1]) n -= 2
 
         for (idx in 2 until n step 2) {
             if (points[idx] != points[idx - 2] || points[idx + 1] != points[idx - 1]) {