[orx-shapes] Fix bug in RectifiedPath for closed paths

orx-shapes/src/commonMain/kotlin/rectify/RectifiedPath.kt

@@ -17,7 +17,7 @@ abstract class RectifiedPath<T : EuclideanVector<T>>(
     val candidatePoints =
         originalPath.equidistantPositionsWithT((originalPath.length * lengthScale).toInt().coerceAtLeast(2), distanceTolerance)
 
-    val points = if (originalPath.closed) candidatePoints + candidatePoints.first() else candidatePoints
+    val points = if (originalPath.closed) candidatePoints + candidatePoints.first().copy(second = 1.0) else candidatePoints
 
     val intervals by lazy {
         points.zipWithNext().map {

orx-shapes/src/commonTest/kotlin/TestRectifiedContour.kt

@@ -3,10 +3,19 @@ import org.openrndr.shape.Circle
 import org.openrndr.shape.Ellipse
 import kotlin.math.abs
 import kotlin.test.Test
+import kotlin.test.assertEquals
 import kotlin.test.assertTrue
 
 class TestRectifiedContour {
 
+    @Test
+    fun testEquidistantPointsWithT() {
+        val c = Circle(200.0, 200.0, 100.0).contour
+        val ep = (c.equidistantPositionsWithT(c.length.toInt()))
+        assertEquals(0.0, (ep[0].second))
+    }
+
+
     @Test
     fun testInverse() {
         val c = Ellipse(40.0, 40.0, 40.0, 80.0).contour.sub(0.0, 0.333)
@@ -15,6 +24,5 @@ class TestRectifiedContour {
         val ri = r.inverseRectify(rt)
 
         assertTrue(abs(ri-0.125) < 1E-5)
-
     }
 }