public static double ArcLength(double x1, double y1, double x2, double y2, double xc, double yc)
{
double a, b, c, angle;
a = Mathematics.FindDist(x1, y1, x2, y2);
b = Mathematics.FindDist(xc, yc, x1, y1);
c = Mathematics.FindDist(xc, yc, x2, y2);
angle = Math.Acos((b * b + c * c - a * a) / (2.0 * b * c));
return(b * angle);
}
// метод для общих целей
public static bool pointFitsArc(MyPoint point, MyArc arc, double precision)
{
double radius = Mathematics.FindDist(arc.CenterPoint, arc.StartPoint);
bool pointFits = false;
if (precision < 0)
{
double r = Mathematics.FindDist(arc.CenterPoint, arc.StartPoint);
precision = r * 0.05;
}
pointFits = Math.Abs(Mathematics.FindDist(point, arc.CenterPoint) - radius) < precision;
if (pointFits)
{
return(checkValidPointOnArc(point, arc));
}
else
{
return(false);
}
}