private void CreateCurves()
{
curves.Clear();
for (int i = 0, len = nodes.Count - 1; i < len; i++)
{
SplineNode n = nodes[i];
SplineNode next = nodes[i + 1];
CubicBezierCurve curve = new CubicBezierCurve(n, next, m_CurveResolution);
curves.Add(curve);
}
m_NeedsUpdate = true;
}
/// <summary>
/// Adds a node at the end of the spline.
/// </summary>
/// <param name="node"></param>
public virtual int AddNode(SplineNode node)
{
nodes.Add(node);
int numNodes = nodes.Count;
if (numNodes != 1)
{
SplineNode previousNode = nodes[numNodes - 2];
CubicBezierCurve curve = new CubicBezierCurve(previousNode, node, m_CurveResolution);
curves.Add(curve);
}
m_NeedsUpdate = true;
return(numNodes);
}
/// <summary>
/// Insert the given node in the spline at index. Index must be greater than 0 and less than node count.
/// </summary>
/// <param name="index"></param>
/// <param name="node"></param>
public void InsertNode(int index, SplineNode node)
{
if (index == 0)
{
throw new Exception("Can't insert a node at index 0");
}
SplineNode previousNode = nodes[index - 1];
SplineNode nextNode = nodes[index];
nodes.Insert(index, node);
curves[index - 1].ConnectEnd(node);
CubicBezierCurve curve = new CubicBezierCurve(node, nextNode, m_CurveResolution);
curves.Insert(index, curve);
m_NeedsUpdate = true;
}
/// <summary>
/// Returns the tangent of spline at distance. Distance must be between 0 and spline length.
/// </summary>
/// <param name="d"></param>
/// <returns></returns>
public Vector3 GetTangentAlongSplineAtDistance(float d)
{
d = Mathf.Clamp(d, 0, length);
for (int i = 0, numCurves = curves.Count; i < numCurves; i++)
{
CubicBezierCurve curve = curves[i];
if (d > curve.Length)
{
d -= curve.Length;
}
else
{
return(curve.GetTangentAtDistance(d));
}
}
throw new Exception("Something went wrong with GetTangentAlongSplineAtDistance");
}
public void Update()
{
if (NeedsUpdate)
{
m_NeedsUpdate = false;
length = 0;
for (int i = 0, numCurves = curves.Count; i < numCurves; i++)
{
CubicBezierCurve curve = curves[i];
curve.Update();
length += curve.Length;
}
if (CurveChanged != null)
{
CurveChanged.Invoke();
}
}
}
/// <summary>
/// Remove the given node from the spline. The given node must exist and the spline must have more than 2 nodes.
/// </summary>
/// <param name="node"></param>
public void RemoveNode(SplineNode node)
{
int index = nodes.IndexOf(node);
if (nodes.Count <= 2)
{
throw new Exception("Can't remove the node because a spline needs at least 2 nodes.");
}
CubicBezierCurve toRemove = index == nodes.Count - 1 ? curves[index - 1] : curves[index];
if (index != 0 && index != nodes.Count - 1)
{
SplineNode nextNode = nodes[index + 1];
curves[index - 1].ConnectEnd(nextNode);
}
nodes.RemoveAt(index);
curves.Remove(toRemove);
m_NeedsUpdate = true;
}
public CubicBezierCurve.CurveSample Iterate()
{
if (m_IterCurveIndex >= curves.Count)
{
return(null);
}
CubicBezierCurve curve = curves[m_IterCurveIndex];
CubicBezierCurve.CurveSample sample = curve.Iterate();
if (sample == null)
{
m_IterCurveIndex++;
if (m_IterCurveIndex < curves.Count)
{
sample = curves[m_IterCurveIndex].NewIteration();
}
}
return(sample);
}