static Point TangentIntersection(CurveTangent tangentA, CurveTangent tangentB)
{
Point x;
Point.LineLineIntersection(tangentA.touchPoint, tangentA.touchPoint + tangentA.direction, tangentB.touchPoint, tangentB.touchPoint + tangentB.direction, out x);
return(x);
}
static IEnumerable <Point> PointsOnAroundPolyline(ICurve curve)
{
bool firstSide = true;
CurveTangent prevTangent = null;
CurveTangent firstCurveTangent = null;
foreach (CurveTangent curveTangent in TangentsAroundCurve(curve))
{
if (firstSide)
{
firstSide = false;
firstCurveTangent = prevTangent = curveTangent;
}
else
{
if (!TangentsAreParallel(prevTangent, curveTangent))
{
yield return(TangentIntersection(prevTangent, curveTangent));
}
prevTangent = curveTangent;
}
}
yield return(TangentIntersection(firstCurveTangent, prevTangent));
}
static bool TangentsAreParallel(CurveTangent a, CurveTangent b)
{
return(Math.Abs(a.direction.X * b.direction.Y - a.direction.Y * b.direction.X) < ApproximateComparer.DistanceEpsilon);
}
static bool TangentsAreParallel(CurveTangent a, CurveTangent b) {
return Math.Abs(a.direction.X * b.direction.Y - a.direction.Y * b.direction.X) < ApproximateComparer.DistanceEpsilon;
}
static Point TangentIntersection(CurveTangent tangentA, CurveTangent tangentB) {
Point x;
Point.LineLineIntersection(tangentA.touchPoint, tangentA.touchPoint+tangentA.direction, tangentB.touchPoint, tangentB.touchPoint+tangentB.direction, out x);
return x;
}