// CORRECTNESS: not calculating tangents across closed rotoPaths
Vec2f AbstractPath::tangent(const int i) const {
assert(i>=0 && i<getNumElements());
if (_tangents)
return _tangents[i];
Vec2f U;
if (i==0)
Vec2f_Sub(U,getElement(1), getElement(0));
else if (i==getNumElements()-1)
Vec2f_Sub(U,getElement(getNumElements()-1),
getElement(getNumElements()-2));
else {
Vec2f_Sub(U,getElement(i+1), getElement(i-1));
}
U.Normalize();
return U;
}
Bboxf2D DrawPath::calcBbox() const
{
Bboxf2D bbox;
for (int i = 0; i < getNumElements(); i++)
{
Bboxf2D currBox;
Vec2f currLoc = getElement(i), extLoc, thick(_thick.getElement(i),
_thick.getElement(i));
Vec2f_Sub(extLoc, currLoc, thick);
currBox.includePoint(extLoc);
Vec2f_Add(extLoc, currLoc, thick);
currBox.includePoint(extLoc);
bbox.setToUnion(currBox);
}
return bbox;
}
