While looking into bug 1696331, I noticed that interpolation from zero tangents was...
authordooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Wed, 11 Apr 2007 20:01:19 +0000 (20:01 +0000)
committerdooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Wed, 11 Apr 2007 20:01:19 +0000 (20:01 +0000)
commitff60dac53c84aa7924d894732832bd4a514848d4
tree26b131509e92b238b0e1b1c23db892b8946293d3
parent0a5b5d3aab454a07d22f3b8e0673bc3c1e5333e8
While looking into bug 1696331, I noticed that interpolation from zero tangents was being treated differently in different verticies.  Turns out it was using a radial interpolation, which doesn't make much sense for zero vectors (since they have no 'angle' to interpolate from).  Use linear interpolation in this case.

git-svn-id: http://svn.voria.com/code@455 1f10aa63-cdf2-0310-b900-c93c546f37ac
synfig-core/trunk/src/synfig/valuenode_bline.cpp