Round integer subtraction convertions to the nearest integer.

git-svn-id: http://svn.voria.com/code@710 1f10aa63-cdf2-0310-b900-c93c546f37ac

diff --git a/synfig-core/trunk/src/synfig/valuenode_subtract.cpp b/synfig-core/trunk/src/synfig/valuenode_subtract.cpp
index cb43e95..4d31718 100644 (file)
--- a/synfig-core/trunk/src/synfig/valuenode_subtract.cpp
+++ b/synfig-core/trunk/src/synfig/valuenode_subtract.cpp
@@ -197,7 +197,11 @@ synfig::ValueNode_Subtract::operator()(Time t)const
        if(get_type()==ValueBase::TYPE_COLOR)
                return ((*ref_a)(t).get(Color())-(*ref_b)(t).get(Color()))*(*scalar)(t).get(Real());
        if(get_type()==ValueBase::TYPE_INTEGER)
-               return static_cast<int>(((*ref_a)(t).get(int())-(*ref_b)(t).get(int()))*(*scalar)(t).get(Real()) + 0.5f);
+       {
+               Real value = ((*ref_a)(t).get(int())-(*ref_b)(t).get(int()))*(*scalar)(t).get(Real()) + 0.5f;
+               if (value < 0) return static_cast<int>(value-1);
+               return static_cast<int>(value);
+       }
        if(get_type()==ValueBase::TYPE_REAL)
                return ((*ref_a)(t).get(Vector::value_type())-(*ref_b)(t).get(Vector::value_type()))*(*scalar)(t).get(Real());
        if(get_type()==ValueBase::TYPE_VECTOR)