5 files changed, 39 insertions, 15 deletions
diff --git a/src/live_effects/parameter/point.cpp b/src/live_effects/parameter/point.cpp
index 9b48327f6..1dbdbd6aa 100644
--- a/src/live_effects/parameter/point.cpp
+++ b/src/live_effects/parameter/point.cpp
@@ -78,14 +78,14 @@ PointParam::param_writeSVGValue() const
 Gtk::Widget *
 PointParam::param_newWidget(Gtk::Tooltips * tooltips)
 {
-    Inkscape::UI::Widget::RegisteredPoint * pointwdg = Gtk::manage(
-        new Inkscape::UI::Widget::RegisteredPoint( param_label,
-                                                   param_tooltip,
-                                                   param_key,
-                                                   *param_wr,
-                                                   param_effect->getRepr(),
-                                                   param_effect->getSPDoc() ) );
-    pointwdg->setValue( (*this)[0], (*this)[1] );
+    Inkscape::UI::Widget::RegisteredTransformedPoint * pointwdg = Gtk::manage(
+        new Inkscape::UI::Widget::RegisteredTransformedPoint( param_label,
+                                                              param_tooltip,
+                                                              param_key,
+                                                              *param_wr,
+                                                              param_effect->getRepr(),
+                                                              param_effect->getSPDoc() ) );
+    pointwdg->setValue( *this );
     pointwdg->clearProgrammatically();
     pointwdg->set_undo_parameters(SP_VERB_DIALOG_LIVE_PATH_EFFECT, _("Change point parameter"));
 
diff --git a/src/ui/widget/point.cpp b/src/ui/widget/point.cpp
index 1efb26a78..508a8d961 100644
--- a/src/ui/widget/point.cpp
+++ b/src/ui/widget/point.cpp
@@ -194,10 +194,10 @@ Point::setRange(double min, double max)
 
 /** Sets the value of the spin button */
 void
-Point::setValue(double xvalue, double yvalue)
+Point::setValue(Geom::Point & p)
 {
-    xwidget.setValue(xvalue);
-    ywidget.setValue(yvalue);
+    xwidget.setValue(p[0]);
+    ywidget.setValue(p[1]);
 }
 
 /** Manually forces an update of the spin button */
diff --git a/src/ui/widget/point.h b/src/ui/widget/point.h
index a9be05afc..57a46de76 100644
--- a/src/ui/widget/point.h
+++ b/src/ui/widget/point.h
@@ -64,7 +64,7 @@ public:
     void    setDigits(unsigned digits);
     void    setIncrements(double step, double page);
     void    setRange(double min, double max);
-    void    setValue(double xvalue, double yvalue);
+    void    setValue(Geom::Point & p);
 
     void    update();
 
diff --git a/src/ui/widget/registered-widget.cpp b/src/ui/widget/registered-widget.cpp
index 1de084f5d..1fd956897 100644
--- a/src/ui/widget/registered-widget.cpp
+++ b/src/ui/widget/registered-widget.cpp
@@ -481,7 +481,7 @@ RegisteredTransformedPoint::RegisteredTransformedPoint ( const Glib::ustring& la
                         const Glib::ustring& key, Registry& wr, Inkscape::XML::Node* repr_in,
                         SPDocument* doc_in )
     : RegisteredWidget<Point> (label, tip),
-      transform(Geom::identity())
+      to_svg(Geom::identity())
 {
     init_parent(key, wr, repr_in, doc_in);
 
@@ -493,6 +493,25 @@ RegisteredTransformedPoint::RegisteredTransformedPoint ( const Glib::ustring& la
 }
 
 void
+RegisteredTransformedPoint::setValue(Geom::Point & p)
+{
+    Geom::Point new_p = p * to_svg.inverse();
+    Point::setValue(new_p);  // the Point widget should display things in canvas coordinates
+}
+
+void
+RegisteredTransformedPoint::setTransform(Geom::Matrix & canvas_to_svg)
+{
+    // check if matrix is singular / has inverse
+    if ( ! canvas_to_svg.isSingular() ) {
+        to_svg = canvas_to_svg;
+    } else {
+        // set back to default
+        to_svg = Geom::identity();
+    }
+}
+
+void
 RegisteredTransformedPoint::on_value_changed()
 {
     if (setProgrammatically()) {
@@ -505,7 +524,7 @@ RegisteredTransformedPoint::on_value_changed()
 
     _wr->setUpdating (true);
 
-    Geom::Point pos = getValue() * transform;
+    Geom::Point pos = getValue() * to_svg;
 
     Inkscape::SVGOStringStream os;
     os << pos;
diff --git a/src/ui/widget/registered-widget.h b/src/ui/widget/registered-widget.h
index f34895620..d5f7591ee 100644
--- a/src/ui/widget/registered-widget.h
+++ b/src/ui/widget/registered-widget.h
@@ -304,12 +304,17 @@ public:
                                   Inkscape::XML::Node* repr_in = NULL,
                                   SPDocument *doc_in = NULL );
 
+    // redefine setValue, because transform must be applied
+    void setValue(Geom::Point & p);
+
+    void setTransform(Geom::Matrix & canvas_to_svg);
+
 protected:
     sigc::connection  _value_x_changed_connection;
     sigc::connection  _value_y_changed_connection;
     void on_value_changed();
 
-    Geom::Matrix transform;
+    Geom::Matrix to_svg;
 };