public override Point2D GetPointAtParam(double par)
{
Vector2D vec = new Vector2D(Radius, StartAngle);
Angle angle = new Angle(IsClockWise ? -par : par);
return(Center + vec.RotateBy(angle));
}
public override Point2D GetPointAtParam(double par)
{
Angle angle = StartAngle + new Angle(IsClockWise ? -par : par);
Vector2D vec =
new Vector2D(
Major * Math.Cos(angle),
Minor * Math.Sin(angle));
return(Center + vec.RotateBy(Rotation));
}
public CircleArc2D(Point2D start, Point2D end, double bulge)
{
int sign = Math.Sign(bulge);
IsClockWise = sign == -1;
bulge = Math.Abs(bulge);
Point2D cen = (start + end) / 2;
Vector2D vec = (end - start) / 2;
vec = vec.RotateBy(Angle.Degree90);
vec *= (1 - bulge) * sign;
Center = cen + vec;
vec = start - Center;
Radius = vec.Length;
StartAngle = vec.Angle;
EndAngle = (end - Center).Angle;
}
