[orx-shapes] Add splitIn

orx-shapes/src/commonMain/kotlin/adjust/ContourAdjusterEdge.kt

@@ -20,8 +20,6 @@ data class ContourAdjusterEdge(val contourAdjuster: ContourAdjuster, val segment
     }
 
 
-
-
     /**
      * 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
@@ -65,18 +65,27 @@ 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()
         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) }
 

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
@@ -111,6 +113,20 @@ data class ContourEdge(
         return ContourEdge(ShapeContour.fromSegments(newSegments, contour.closed), segmentIndex, adjustments)
     }
 
+    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()
@@ -255,7 +271,5 @@ data class ContourEdge(
             translate(-anchor)
         }, updateTangents)
     }
-
-
 }