This push add a partial solution to scale powerstroke shapes without distorsion

Currently best results are for fixed ratio scales, non fixed scale give a aproximation.

(bzr r13341.1.228)

2 files changed, 8 insertions, 5 deletions

diff --git a/src/live_effects/parameter/powerstrokepointarray.cpp b/src/live_effects/parameter/powerstrokepointarray.cpp
index 427be8065..851b12ef8 100644
--- a/src/live_effects/parameter/powerstrokepointarray.cpp
+++ b/src/live_effects/parameter/powerstrokepointarray.cpp
@@ -68,13 +68,16 @@ PowerStrokePointArrayParam::param_newWidget()
 */
 }
 
-
-void PowerStrokePointArrayParam::param_transform_multiply(Geom::Affine const& /*postmul*/, bool /*set*/)
+void PowerStrokePointArrayParam::param_transform_multiply(Geom::Affine const& postmul, bool /*set*/)
 {
-//    param_set_and_write_new_value( (*this) * postmul );
+    std::vector<Geom::Point> result;
+    for (std::vector<Geom::Point>::const_iterator point_it = _vector.begin(); point_it != _vector.end(); ++point_it) {
+        Geom::Coord A = (*point_it)[Geom::Y] * ((postmul.expansionX() + postmul.expansionY()) / 2);
+        result.push_back(Geom::Point((*point_it)[Geom::X], A));
+    }
+    param_set_and_write_new_value(result);
 }
 
-
 /** call this method to recalculate the controlpoints such that they stay at the same location relative to the new path. Useful after adding/deleting nodes to the path.*/
 void
 PowerStrokePointArrayParam::recalculate_controlpoints_for_new_pwd2(Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
diff --git a/src/live_effects/parameter/powerstrokepointarray.h b/src/live_effects/parameter/powerstrokepointarray.h
index 911bbc82d..70b22e27e 100644
--- a/src/live_effects/parameter/powerstrokepointarray.h
+++ b/src/live_effects/parameter/powerstrokepointarray.h
@@ -31,7 +31,7 @@ public:
 
     virtual Gtk::Widget * param_newWidget();
 
-    virtual void param_transform_multiply(Geom::Affine const& /*postmul*/, bool /*set*/);
+    virtual void param_transform_multiply(Geom::Affine const& postmul, bool /*set*/);
 
     void set_oncanvas_looks(SPKnotShapeType shape, SPKnotModeType mode, guint32 color);