public static double[] getArcAngle(CircleArcGeometry arc, bool ccw)
{
double xb = 0, yb = 0, xm = 0, ym = 0, xe = 0, ye = 0;
arc.GetThreePoints(ref xe, ref ye, ref xm, ref ym, ref xb, ref yb);
double xc = arc.CenterX;
double yc = arc.CenterY;
double radius = arc.Radius;
double dx1 = xb - xc;
double dy1 = yb - yc;
double ang1 = Math.Atan2(dx1, dy1);
double ang2 = Math.Atan2(xe - xc, ye - yc);
double sweep = ang2 - ang1;
if (sweep < 0)
{
sweep = 2 * Math.PI + sweep;
}
return(new double[] { sweep, ang1 });
}
public static Tuple <double, double> GetArcAngle(CircleArcGeometry arc)
{
double xb = 0, yb = 0, xm = 0, ym = 0, xe = 0, ye = 0;
arc.GetThreePoints(ref xe, ref ye, ref xm, ref ym, ref xb, ref yb);
double xc = arc.CenterX;
double yc = arc.CenterY;
double dx1 = xb - xc;
double dy1 = yb - yc;
double ang1 = Math.Atan2(dx1, dy1);
double ang2 = Math.Atan2(xe - xc, ye - yc);
double sweep = ang2 - ang1;
if (sweep < 0)
{
sweep = 2 * Math.PI + sweep;
}
return(new Tuple <double, double>(sweep, ang1));
}