Allow the use of horizontal scrolling to adjust the current time in timeslider widget...

[synfig.git] / synfig-studio / trunk / src / gtkmm / duck.cpp

diff --git a/synfig-studio/trunk/src/gtkmm/duck.cpp b/synfig-studio/trunk/src/gtkmm/duck.cpp
index ec67e16..63bebe7 100644 (file)
--- a/synfig-studio/trunk/src/gtkmm/duck.cpp
+++ b/synfig-studio/trunk/src/gtkmm/duck.cpp
@@ -32,6 +32,8 @@
 #include "duck.h"
 #include <ETL/misc>
 
+#include "general.h"
+
 #endif
 
 /* === U S I N G =========================================================== */
@@ -193,9 +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);