/// <summary>
/// 获取样条曲线
/// </summary>
/// <param name="points">基准点</param>
/// <returns>样条曲线</returns>
public static List <Vector3> FetchCurves(int ratio, params Vector3[] points)
{
if (points == null || points.Length == 0)
{
return(null);
}
List <SplineCurves> splines = new List <SplineCurves>();
SplineCurves current, pre;
foreach (var point in points)
{
if (splines.Count == 0)
{
current = new SplineCurves(ratio);
current.AddJoint(null, point);
splines.Add(current);
}
else
{
current = new SplineCurves(ratio);
pre = splines[splines.Count - 1];
current.AddJoint(pre, point);
splines.Add(current);
}
}
List <Vector3> curves = new List <Vector3>();
foreach (SplineCurves spline in splines)
{
if (spline.First)
{
continue;
}
foreach (Vector3 point in spline.points)
{
if (curves.Contains(point))
{
continue;
}
curves.Add(point);
}
}
return(curves);
}
/// <summary>
/// 添加关节。将新控制点添加到控制点列表中，并更新前面的样条曲线。
/// </summary>
/// <param name="spline">上一条样条曲线</param>
/// <param name="point">当前点</param>
public void AddJoint(SplineCurves spline, Vector3 point)
{
//前一根样条曲线不为null，所以更新前一根样条曲线的控制点列表，同时更新当前样条曲线的控制点列表。
if (spline != null)
{
//前一根样条曲线是第1根样条曲线，更新它的Pk+1和Pk+2点
if (spline.First)
{
origin = spline.origin;
start = spline.start;
end = point;
destination = point;
GenerateSamplePoint();
return;
}
//前一根样条曲线不是第1根样条曲线，仅更新它的Pk+2点
else
{
spline.destination = point;
spline.GenerateSamplePoint();
origin = spline.start;
start = spline.end;
end = point;
destination = point;
GenerateSamplePoint();
}
}
//前一根样条曲线spline为null，说明控制点列表中只有一个点，所以4个控制点样同。
else
{
origin = point;
start = point;
end = point;
destination = point;
First = true;
}
}