private void CalculatePath()
{
calculatedPath.Clear();
// Sliders may consist of various subpaths separated by two consecutive vertices
// with the same position. The following loop parses these subpaths and computes
// their shape independently, consecutively appending them to calculatedPath.
int start = 0;
int end = 0;
for (int i = 0; i < ControlPoints.Length(); ++i)
{
end++;
if (i == ControlPoints.Length() - 1 || ControlPoints[i] == ControlPoints[i + 1] && i != ControlPoints.Length() - 2)
{
List <Vector2> cpSpan = ControlPoints.GetRange(start, end - start);
foreach (Vector2 t in CalculateSubpath(cpSpan))
{
if (calculatedPath.Count == 0 || calculatedPath.Last() != t)
{
calculatedPath.Add(t);
}
}
start = end;
}
}
}
private List <Vector2> CalculateSubpath(List <Vector2> subControlPoints)
{
switch (Type)
{
case PathType.Linear:
return(PathApproximator.ApproximateLinear(subControlPoints));
case PathType.PerfectCurve:
//we can only use CircularArc iff we have exactly three control points and no dissection.
if (ControlPoints.Length() != 3 || subControlPoints.Length() != 3)
{
break;
}
// Here we have exactly 3 control points. Attempt to fit a circular arc.
List <Vector2> subpath = PathApproximator.ApproximateCircularArc(subControlPoints);
// If for some reason a circular arc could not be fit to the 3 given points, fall back to a numerically stable bezier approximation.
if (subpath.Count == 0)
{
break;
}
return(subpath);
case PathType.Catmull:
return(PathApproximator.ApproximateCatmull(subControlPoints));
}
return(PathApproximator.ApproximateBezier(subControlPoints));
}
