From 2293d5d74ec1020cf47f666a95747d02d860c70c Mon Sep 17 00:00:00 2001
From: Edwin Jakobs <edwin@rndr.studio>
Date: Sat, 28 Oct 2023 14:01:39 +0200
Subject: [PATCH] [orx-shapes] Add splitIn

---
 .../kotlin/adjust/ContourAdjusterEdge.kt      | 27 ++++++++++++-------
 .../commonMain/kotlin/adjust/ContourEdge.kt   | 22 ++++++++++++---
 2 files changed, 36 insertions(+), 13 deletions(-)

diff --git a/orx-shapes/src/commonMain/kotlin/adjust/ContourAdjusterEdge.kt b/orx-shapes/src/commonMain/kotlin/adjust/ContourAdjusterEdge.kt
index a588653f..4a57f2a1 100644
--- a/orx-shapes/src/commonMain/kotlin/adjust/ContourAdjusterEdge.kt
+++ b/orx-shapes/src/commonMain/kotlin/adjust/ContourAdjusterEdge.kt
@@ -11,17 +11,15 @@ data class ContourAdjusterEdge(val contourAdjuster: ContourAdjuster, val segment
     val endPosition
         get() = contourAdjuster.contour.segments[segmentIndex()].end
 
-    fun position(t: Double) : Vector2 {
+    fun position(t: Double): Vector2 {
         return contourAdjuster.contour.segments[segmentIndex()].position(t)
     }
 
-    fun normal(t: Double) : Vector2 {
+    fun normal(t: Double): Vector2 {
         return contourAdjuster.contour.segments[segmentIndex()].normal(t)
     }
 
 
-
-
     /**
      * A [ContourAdjusterVertex] interface for the start-vertex of the edge
      */
@@ -32,7 +30,9 @@ data class ContourAdjusterEdge(val contourAdjuster: ContourAdjuster, val segment
      * A [ContourAdjusterVertex] interface for the end-vertex of the edge
      */
     val end
-        get() = ContourAdjusterVertex(contourAdjuster, { (segmentIndex() + 1).mod(contourAdjuster.contour.segments.size) } )
+        get() = ContourAdjusterVertex(
+            contourAdjuster,
+            { (segmentIndex() + 1).mod(contourAdjuster.contour.segments.size) })
 
     /**
      * A link to the edge before this edge
@@ -56,7 +56,7 @@ data class ContourAdjusterEdge(val contourAdjuster: ContourAdjuster, val segment
             this.copy(segmentIndex = { (segmentIndex() + 1).mod(contourAdjuster.contour.segments.size) })
         } else {
             if (segmentIndex() < contourAdjuster.contour.segments.size - 1) {
-                this.copy(segmentIndex =  { segmentIndex() + 1 } )
+                this.copy(segmentIndex = { segmentIndex() + 1 })
             } else {
                 null
             }
@@ -65,27 +65,36 @@ data class ContourAdjusterEdge(val contourAdjuster: ContourAdjuster, val segment
     fun select() {
         contourAdjuster.selectEdge(segmentIndex())
     }
+
     private fun wrap(block: ContourEdge.() -> ContourEdge) {
-        val newEdge =  ContourEdge(contourAdjuster.contour, segmentIndex()).block()
+        val newEdge = ContourEdge(contourAdjuster.contour, segmentIndex()).block()
         contourAdjuster.contour = newEdge.contour
         contourAdjuster.updateSelection(newEdge.adjustments)
     }
+
     fun toLinear() = wrap { toLinear() }
 
     fun toCubic() = wrap { toCubic() }
     fun splitAt(t: Double) = wrap { splitAt(t) }
+
+    /**
+     * split edge in [numberOfParts] parts of equal length
+     */
+    fun splitIn(numberOfParts: Int) = wrap { splitIn(numberOfParts) }
+
     fun moveBy(translation: Vector2, updateTangents: Boolean = true) = wrap { movedBy(translation, updateTangents) }
     fun rotate(rotationInDegrees: Double, anchorT: Double = 0.5, updateTangents: Boolean = true) =
         wrap { rotatedBy(rotationInDegrees, anchorT, updateTangents) }
+
     fun scale(scaleFactor: Double, anchorT: Double = 0.5, updateTangents: Boolean = true) =
         wrap { scaledBy(scaleFactor, anchorT, updateTangents = true) }
 
-    fun replaceWith(t:Double, updateTangents: Boolean = true) = wrap { replacedWith(t, updateTangents) }
+    fun replaceWith(t: Double, updateTangents: Boolean = true) = wrap { replacedWith(t, updateTangents) }
 
     fun replaceWith(openContour: ShapeContour) = wrap { replacedWith(openContour) }
 
 
-    fun sub(t0:Double, t1: Double, updateTangents: Boolean = true) {
+    fun sub(t0: Double, t1: Double, updateTangents: Boolean = true) {
         contourAdjuster.contour =
             ContourEdge(contourAdjuster.contour, segmentIndex())
                 .subbed(t0, t1)
diff --git a/orx-shapes/src/commonMain/kotlin/adjust/ContourEdge.kt b/orx-shapes/src/commonMain/kotlin/adjust/ContourEdge.kt
index 3d4ec46b..c2db5cb6 100644
--- a/orx-shapes/src/commonMain/kotlin/adjust/ContourEdge.kt
+++ b/orx-shapes/src/commonMain/kotlin/adjust/ContourEdge.kt
@@ -1,5 +1,7 @@
 package org.openrndr.extra.shapes.adjust
 
+import org.openrndr.extra.shapes.rectify.rectified
+import org.openrndr.extra.shapes.utilities.fromContours
 import org.openrndr.extra.shapes.utilities.insertPointAt
 import org.openrndr.math.Matrix44
 import org.openrndr.math.Vector2
@@ -111,11 +113,25 @@ data class ContourEdge(
         return ContourEdge(ShapeContour.fromSegments(newSegments, contour.closed), segmentIndex, adjustments)
     }
 
-    fun replacedWith(openContour: ShapeContour) : ContourEdge {
+    fun splitIn(parts: Int): ContourEdge {
+        if (contour.empty || parts < 2) {
+            return withoutAdjustments()
+        }
+        val segment = contour.segments[segmentIndex]
+        val r = segment.contour.rectified()
+        val newSegments = (0..parts).map {
+            it.toDouble() / parts
+        }.windowed(2, 1).map {
+            r.sub(it[0], it[1])
+        }
+        return replacedWith(ShapeContour.fromContours(newSegments, false))
+    }
+
+    fun replacedWith(openContour: ShapeContour): ContourEdge {
         if (contour.empty) {
             return withoutAdjustments()
         }
-        require(!openContour.closed) { "openContour should be open"}
+        require(!openContour.closed) { "openContour should be open" }
         val segment = contour.segments[segmentIndex]
         var newSegments = contour.segments.toMutableList()
 
@@ -255,7 +271,5 @@ data class ContourEdge(
             translate(-anchor)
         }, updateTangents)
     }
-
-
 }