2 files changed, 16 insertions, 0 deletions
diff --git a/src/live_effects/parameter/powerstrokepointarray.cpp b/src/live_effects/parameter/powerstrokepointarray.cpp
index bc06e42ca..7e2da4cfd 100644
--- a/src/live_effects/parameter/powerstrokepointarray.cpp
+++ b/src/live_effects/parameter/powerstrokepointarray.cpp
@@ -89,6 +89,21 @@ PowerStrokePointArrayParam::recalculate_controlpoints_for_new_pwd2(Geom::Piecewi
     }
 }
 
+/** call this method to recalculate the controlpoints when path is reversed.*/
+void
+PowerStrokePointArrayParam::reverse_controlpoints()
+{
+    if (!last_pwd2.empty()) {
+        Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in_reverse = reverse(last_pwd2);
+        for (unsigned int i = 0; i < _vector.size(); ++i) {
+            Geom::Point control_pos = last_pwd2.valueAt(_vector[i][Geom::X]);
+            double new_pos = Geom::nearest_time(control_pos, pwd2_in_reverse);
+            _vector[i][Geom::X] = new_pos;
+        }
+        write_to_SVG();
+    }
+}
+
 float PowerStrokePointArrayParam::median_width()
 {
 	size_t size = _vector.size();
diff --git a/src/live_effects/parameter/powerstrokepointarray.h b/src/live_effects/parameter/powerstrokepointarray.h
index 621d3b969..b8e63e5f7 100644
--- a/src/live_effects/parameter/powerstrokepointarray.h
+++ b/src/live_effects/parameter/powerstrokepointarray.h
@@ -47,6 +47,7 @@ public:
     Geom::Piecewise<Geom::D2<Geom::SBasis> > const & get_pwd2_normal() const { return last_pwd2_normal; }
 
     void recalculate_controlpoints_for_new_pwd2(Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
+    void reverse_controlpoints();
     void set_scale_width(double scale_width){_scale_width = scale_width;};
     double _scale_width;
     friend class PowerStrokePointArrayParamKnotHolderEntity;