Fix the angle-duck rotation counter code.

git-svn-id: http://svn.voria.com/code@1152 1f10aa63-cdf2-0310-b900-c93c546f37ac

diff --git a/synfig-studio/trunk/src/gtkmm/duck.cpp b/synfig-studio/trunk/src/gtkmm/duck.cpp
index 8500b89..63bebe7 100644 (file)
--- a/synfig-studio/trunk/src/gtkmm/duck.cpp
+++ b/synfig-studio/trunk/src/gtkmm/duck.cpp
@@ -195,9 +195,11 @@ Duck::set_sub_trans_point(const synfig::Point &x)
        {
                Angle old_angle = get_point().angle();
                set_point((x-get_sub_trans_origin())/get_scalar());
-               Angle new_angle = get_point().angle();
+               Angle change = get_point().angle() - old_angle;
+               while (change < Angle::deg(-180)) change += Angle::deg(360);
+               while (change > Angle::deg(180)) change -= Angle::deg(360);
                int old_quarters = round_to_int(Angle::deg(rotations).get()/90);
-               rotations += new_angle.dist(old_angle);
+               rotations += change;
                int new_quarters = round_to_int(Angle::deg(rotations).get()/90);
                if (old_quarters != new_quarters)
                        synfig::info("rotation: %.2f turns", new_quarters/4.0);