Revision 1150 stopped synfig-core/trunk/examples/star.sifz from rendering correctly...

[synfig.git] / synfig-core / trunk / src / synfig / valuenode_bline.cpp

diff --git a/synfig-core/trunk/src/synfig/valuenode_bline.cpp b/synfig-core/trunk/src/synfig/valuenode_bline.cpp
index a5dc1de..dde8a45 100644 (file)
--- a/synfig-core/trunk/src/synfig/valuenode_bline.cpp
+++ b/synfig-core/trunk/src/synfig/valuenode_bline.cpp
@@ -79,7 +79,12 @@ radial_interpolation(const Vector& a, const Vector& b, float c)
        affine_combo<Angle,float> ang_combo;
 
        Real mag(mag_combo(a.mag(),b.mag(),c));
-       Angle ang(ang_combo(Angle::tan(a[1],a[0]),Angle::tan(b[1],b[0]),c));
+       Angle angle_a(Angle::tan(a[1],a[0]));
+       Angle angle_b(Angle::tan(b[1],b[0]));
+       float diff = Angle::deg(angle_b - angle_a).get();
+       if (diff < -180) angle_b += Angle::deg(360);
+       else if (diff > 180) angle_a += Angle::deg(360);
+       Angle ang(ang_combo(angle_a, angle_b, c));
 
        return Point( mag*Angle::cos(ang).get(),mag*Angle::sin(ang).get() );
 }