public Point GetPoint(SplinePositionReference positionReference)
{
double s = (1 - this.tension) / 2;
Point[] points = this.controlPoints.ToArray();
int cpIndex = positionReference.ControlPoint;
double t = positionReference.T;
if (cpIndex < 0 || cpIndex >= points.Length - 1 || t < 0 || t > 1)
{
return(default(Point));
}
Point p1, p2, p3, p4;
if (cpIndex == 0)
{
if (points.Length > 2)
{
p1 = new Point(points[0].X - (points[1].X - points[0].X), points[0].Y - (points[1].Y - points[0].Y));
p2 = points[0];
p3 = points[1];
p4 = points[2];
}
else
{
p1 = new Point(points[0].X - (points[1].X - points[0].X), points[0].Y - (points[1].Y - points[0].Y));
p2 = points[0];
p3 = points[1];
p4 = new Point(points[points.Length - 1].X - (points[points.Length - 2].X - points[points.Length - 1].X),
points[points.Length - 1].Y - (points[points.Length - 2].Y - points[points.Length - 1].Y));
}
}
else if (cpIndex < points.Length - 2)
{
p1 = points[cpIndex - 1];
p2 = points[cpIndex];
p3 = points[cpIndex + 1];
p4 = points[cpIndex + 2];
}
else
{
p1 = points[points.Length - 3];
p2 = points[points.Length - 2];
p3 = points[points.Length - 1];
p4 = new Point(points[points.Length - 1].X - (points[points.Length - 2].X - points[points.Length - 1].X),
points[points.Length - 1].Y - (points[points.Length - 2].Y - points[points.Length - 1].Y));
}
return(CalculateCardinalSplinePoint(s, t, p1, p2, p3, p4));
}
public double GetLength(SplinePositionReference positionReference)
{
if (positionReference.ControlPoint < 0)
{
return(0.0);
}
else if (positionReference.ControlPoint >= this.sampledPointsLengths.Length - 1)
{
return(this.sampledPointsLengths[this.sampledPointsLengths.Length - 1]);
}
// Interpolate
double t = positionReference.T;
int index = positionReference.ControlPoint;
return(this.sampledPointsLengths[index] * (1 - t) + this.sampledPointsLengths[index + 1] * t);
}
public Point GetPoint(SplinePositionReference positionReference)
{
if (positionReference.ControlPoint < 0)
{
return(this.sampledPoints[0]);
}
else if (positionReference.ControlPoint >= this.sampledPointsLengths.Length - 1)
{
return(this.sampledPoints[this.sampledPoints.Length - 1]);
}
// Interpolate
double t = positionReference.T;
int index = positionReference.ControlPoint;
return(new Point(this.sampledPoints[index].X * (1 - t) + this.sampledPoints[index + 1].X * t,
this.sampledPoints[index].Y * (1 - t) + this.sampledPoints[index + 1].Y * t));
}