Variant Spline::GetPoint(float f) const
{
if (knots_.Size() < 2)
return knots_.Size() == 1 ? knots_[0] : Variant::EMPTY;
if (f > 1.f)
f = 1.f;
else if (f < 0.f)
f = 0.f;
switch (interpolationMode_)
{
case BEZIER_CURVE:
return BezierInterpolation(knots_, f);
case CATMULL_ROM_CURVE:
return CatmullRomInterpolation(knots_, f);
case LINEAR_CURVE:
return LinearInterpolation(knots_, f);
case CATMULL_ROM_FULL_CURVE:
{
/// \todo Do not allocate a new vector each time
Vector<Variant> fullKnots;
if (knots_.Size() > 1)
{
// Non-cyclic case: duplicate start and end
if (knots_.Front() != knots_.Back())
{
fullKnots.Push(knots_.Front());
fullKnots.Push(knots_);
fullKnots.Push(knots_.Back());
}
// Cyclic case: smooth the tangents
else
{
fullKnots.Push(knots_[knots_.Size() - 2]);
fullKnots.Push(knots_);
fullKnots.Push(knots_[1]);
}
}
return CatmullRomInterpolation(fullKnots, f);
}
default:
URHO3D_LOGERROR("Unsupported interpolation mode");
return Variant::EMPTY;
}
}
Variant Spline::GetPoint(float f) const
{
if (knots_.Size() < 2)
return knots_.Size() == 1 ? knots_[0] : Variant::EMPTY;
if (f > 1.f)
f = 1.f;
else if (f < 0.f)
f = 0.f;
switch (interpolationMode_)
{
case BEZIER_CURVE:
return BezierInterpolation(knots_, f);
default:
LOGERROR("Unsupported interpolation mode");
return Variant::EMPTY;
}
}
Variant Spline::BezierInterpolation(const Vector<Variant>& knots, float t) const
{
if (knots.Size() == 2)
{
switch (knots[0].GetType())
{
case VAR_FLOAT:
case VAR_VECTOR2:
case VAR_VECTOR3:
case VAR_VECTOR4:
case VAR_COLOR:
case VAR_DOUBLE:
return LinearInterpolation(knots[0], knots[1], t);
default:
return Variant::EMPTY;
}
}
else
{
/// \todo Do not allocate a new vector each time
Vector<Variant> interpolatedKnots;
for (unsigned i = 1; i < knots.Size(); i++)
{
switch (knots[0].GetType())
{
case VAR_FLOAT:
case VAR_VECTOR2:
case VAR_VECTOR3:
case VAR_VECTOR4:
case VAR_COLOR:
case VAR_DOUBLE:
interpolatedKnots.Push(LinearInterpolation(knots[i - 1], knots[i], t));
break;
default:
return Variant::EMPTY;
}
}
return BezierInterpolation(interpolatedKnots, t);
}
}
