void mgnear::beziersBox(
Box2d& box, int count, const Point2d* points, bool closed)
{
box.empty();
for (int i = 0; i + 3 < count; i += 3) {
box.unionWith(computeCubicBox(points + i));
}
if (closed && count > 3) {
box.unionWith(computeCubicBox(points[count - 1],
points[count - 1] * 2 - points[count - 2].asVector(),
points[0] * 2 - points[1].asVector(), points[0]));
}
}
void mgnear::cubicSplinesBox(
Box2d& box, int n, const Point2d* knots,
const Vector2d* knotvs, bool closed, bool hermite)
{
int n2 = (closed && n > 1) ? n + 1 : n;
float d = hermite ? 1.f/3.f : 1.f;
box.empty();
for (int i = 0; i + 1 < n2; i++)
{
box.unionWith(computeCubicBox(knots[i],
knots[i] + knotvs[i] * d,
knots[(i + 1) % n] - knotvs[(i + 1) % n] * d,
knots[(i + 1) % n]));
}
}