/// <summary>
/// Makes sure every control point follows the rules of the knot they belong to, or re-auto generates the control
/// points.
/// </summary>
public void RecalculateControlPoints()
{
_path = null;
if (AutoControlPoints)
{
IEnumerable <Vector3> points = _knots.Select(knot => knot.Position);
var newKnots = CubicBezierKnotUtils.GeneratePathKnots(Looped, points, Tension, Bias, Continuity, true);
// Copy up positions over to knew knots.
for (int i = 0; i < _knots.Count; ++i)
{
newKnots[i].Up = _knots[i].Up;
}
_knots = newKnots;
}
else
{
for (int i = 0; i < _knots.Count; ++i)
{
_knots[i].RecalculateControlPoint(true, true);
}
}
}
/// <summary>
/// Creates an automatic bezier path between the given list of points. If tension, bias and continuity are all 0,
/// This path will be a catmull-rom spline.
/// </summary>
/// <param name="tension">
/// A tension of 0 indicates smooth corners. A tension of 1 indicates sharp corners. Values larger than
/// this range can cause the curves to overshoot. Values smaller than 0 will cause the curves to fold into
/// themselves.
/// </param>
/// <summary>
/// Bias affects how automatic control points should be generated. For a given knot, a positive bias means there
/// will be a strong bend at the start of the outgoing segment, and a negative bias means there will be a strong
/// bend at the end of the incomming segment. The default bias of 0 gives a neutral weighting.
/// </summary>
/// <summary>
/// Continuity affects how automatic control points should be generated. If this value is 0, control points will
/// be C1 continious, (no instant changes in velocity, unless tension is >= 1). This can be though to change how
/// sharp the shape is.
/// </summary>
/// <param name="looped">
/// Whether the path should be looped or not.
/// </param>
/// <param name="overshootMode">
/// How path overshooting should be handled.
/// </param>
/// <param name="points">The points the bezier should map through.</param>
public AutoBezierPath(float tension, float bias, float continuity, bool looped, PathOvershootMode overshootMode,
IEnumerable <Vector3> points)
{
List <CubicBezierKnot> knots = CubicBezierKnotUtils.GeneratePathKnots(looped, points, tension, bias, continuity);
var paths = new List <IPath>();
int numberOfPoints = points.Count();
int count = looped ? numberOfPoints : numberOfPoints - 1;
for (int i = 0; i < count; ++i)
{
int index = i;
int nextIndex = (i + 1) % numberOfPoints;
CubicBezierKnot firstKnot = knots[index];
CubicBezierKnot nextKnot = knots[nextIndex];
var path = new NormalizedBezierPath(firstKnot.Position, firstKnot.OutControlPoint, nextKnot.InControlPoint,
nextKnot.Position);
paths.Add(path);
}
_path = new ChainedPath(overshootMode, paths);
}
