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using UnityEngine;
using System.Collections;
using System.Collections.Generic;
namespace XftWeapon {
public class Spline
{
List<SplineControlPoint> mControlPoints = new List<SplineControlPoint>();
List<SplineControlPoint> mSegments = new List<SplineControlPoint>();
public int Granularity = 20;
public SplineControlPoint this[int index]
{
get
{
if (index > -1 && index < mSegments.Count)
return mSegments[index];
else
return null;
}
}
public List<SplineControlPoint> Segments
{
get
{
return mSegments;
}
}
public List<SplineControlPoint> ControlPoints
{
get
{
return mControlPoints;
}
}
public SplineControlPoint NextControlPoint(SplineControlPoint controlpoint)
{
if (mControlPoints.Count == 0) return null;
int i = controlpoint.ControlPointIndex + 1;
if (i >= mControlPoints.Count)
return null;
else
return mControlPoints[i];
}
public SplineControlPoint PreviousControlPoint(SplineControlPoint controlpoint)
{
if (mControlPoints.Count == 0) return null;
int i = controlpoint.ControlPointIndex - 1;
if (i < 0)
return null;
else
return mControlPoints[i];
}
public Vector3 NextPosition(SplineControlPoint controlpoint)
{
SplineControlPoint seg = NextControlPoint(controlpoint);
if (seg != null)
return seg.Position;
else
return controlpoint.Position;
}
public Vector3 PreviousPosition(SplineControlPoint controlpoint)
{
SplineControlPoint seg = PreviousControlPoint(controlpoint);
if (seg != null)
return seg.Position;
else
return controlpoint.Position;
}
public Vector3 PreviousNormal(SplineControlPoint controlpoint)
{
SplineControlPoint seg = PreviousControlPoint(controlpoint);
if (seg != null)
return seg.Normal;
else
return controlpoint.Normal;
}
public Vector3 NextNormal(SplineControlPoint controlpoint)
{
SplineControlPoint seg = NextControlPoint(controlpoint);
if (seg != null)
return seg.Normal;
else
return controlpoint.Normal;
}
public SplineControlPoint LenToSegment(float t, out float localF)
{
SplineControlPoint seg = null;
t = Mathf.Clamp01(t);
float len = t * mSegments[mSegments.Count - 1].Dist;
int index = 0;
for (index = 0; index < mSegments.Count; index++)
{
if (mSegments[index].Dist >= len)
{
seg = mSegments[index];
break;
}
}
if (index == 0)
{
//skip the first frame.
localF = 0f;
return seg;
}
float PrevLen = 0f;
int prevIdx = seg.SegmentIndex - 1;
SplineControlPoint prevSeg = mSegments[prevIdx];
PrevLen = seg.Dist - prevSeg.Dist;
localF = (len - prevSeg.Dist) / PrevLen;
return prevSeg;
}
public static Vector3 CatmulRom(Vector3 T0, Vector3 P0, Vector3 P1, Vector3 T1, float f)
{
double DT1 = -0.5;
double DT2 = 1.5;
double DT3 = -1.5;
double DT4 = 0.5;
double DE2 = -2.5;
double DE3 = 2;
double DE4 = -0.5;
double DV1 = -0.5;
double DV3 = 0.5;
double FAX = DT1 * T0.x + DT2 * P0.x + DT3 * P1.x + DT4 * T1.x;
double FBX = T0.x + DE2 * P0.x + DE3 * P1.x + DE4 * T1.x;
double FCX = DV1 * T0.x + DV3 * P1.x;
double FDX = P0.x;
double FAY = DT1 * T0.y + DT2 * P0.y + DT3 * P1.y + DT4 * T1.y;
double FBY = T0.y + DE2 * P0.y + DE3 * P1.y + DE4 * T1.y;
double FCY = DV1 * T0.y + DV3 * P1.y;
double FDY = P0.y;
double FAZ = DT1 * T0.z + DT2 * P0.z + DT3 * P1.z + DT4 * T1.z;
double FBZ = T0.z + DE2 * P0.z + DE3 * P1.z + DE4 * T1.z;
double FCZ = DV1 * T0.z + DV3 * P1.z;
double FDZ = P0.z;
float FX = (float)(((FAX * f + FBX) * f + FCX) * f + FDX);
float FY = (float)(((FAY * f + FBY) * f + FCY) * f + FDY);
float FZ = (float)(((FAZ * f + FBZ) * f + FCZ) * f + FDZ);
return new Vector3(FX, FY, FZ);
}
public Vector3 InterpolateByLen(float tl)
{
float localF;
SplineControlPoint seg = LenToSegment(tl, out localF);
return seg.Interpolate(localF);
}
public Vector3 InterpolateNormalByLen(float tl)
{
float localF;
SplineControlPoint seg = LenToSegment(tl, out localF);
return seg.InterpolateNormal(localF);
}
public SplineControlPoint AddControlPoint(Vector3 pos, Vector3 up)
{
SplineControlPoint cp = new SplineControlPoint();
cp.Init(this);
cp.Position = pos;
cp.Normal = up;
mControlPoints.Add(cp);
cp.ControlPointIndex = mControlPoints.Count - 1;
return cp;
}
public void Clear()
{
mControlPoints.Clear();
}
void RefreshDistance()
{
if (mSegments.Count < 1)
return;
mSegments[0].Dist = 0f;
for (int i = 1; i < mSegments.Count; i++)
{
float prevLen = (mSegments[i].Position - mSegments[i - 1].Position).magnitude;
mSegments[i].Dist = mSegments[i - 1].Dist + prevLen;
}
}
public void RefreshSpline()
{
mSegments.Clear();
for (int i = 0; i < mControlPoints.Count; i++)
{
if (mControlPoints[i].IsValid)
{
mSegments.Add(mControlPoints[i]);
mControlPoints[i].SegmentIndex = mSegments.Count - 1;
}
}
RefreshDistance();
}
}
}
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