private static bool IsCubicChordMonotone(Point[] controlPoints, double squaredTolerance)
{
double num = GeometryHelper.SquaredDistance(controlPoints[0], controlPoints[3]);
if (num <= squaredTolerance)
{
return(false);
}
Vector lhs = controlPoints[3].Subtract(controlPoints[0]);
Vector rhs = controlPoints[1].Subtract(controlPoints[0]);
double num2 = GeometryHelper.Dot(lhs, rhs);
if ((num2 < 0.0) || (num2 > num))
{
return(false);
}
Vector vector3 = controlPoints[2].Subtract(controlPoints[0]);
double num3 = GeometryHelper.Dot(lhs, vector3);
if ((num3 < 0.0) || (num3 > num))
{
return(false);
}
if (num2 > num3)
{
return(false);
}
return(true);
}
private IList <double> ComputeAngles()
{
_angles = new double[Count];
for (var i = 1; i < Count - 1; i++)
{
_angles[i] = -GeometryHelper.Dot(Normals[i - 1], Normals[i]);
}
if (IsClosed)
{
var num2 = -GeometryHelper.Dot(Normals[0], Normals[Count - 2]);
_angles[0] = _angles[Count - 1] = num2;
}
else
{
_angles[0] = _angles[Count - 1] = 1.0;
}
return(_angles);
}
private static void GetArcAngle(Point ptStart, Point ptEnd, bool fLargeArc, bool fSweepUp,
out double rCosArcAngle, out double rSinArcAngle, out int cPieces)
{
rCosArcAngle = GeometryHelper.Dot(ptStart, ptEnd);
rSinArcAngle = GeometryHelper.Determinant(ptStart, ptEnd);
if (rCosArcAngle >= 0.0)
{
if (!fLargeArc)
{
cPieces = 1;
return;
}
cPieces = 4;
}
else if (fLargeArc)
{
cPieces = 3;
}
else
{
cPieces = 2;
}
var d = Math.Atan2(rSinArcAngle, rCosArcAngle);
if (fSweepUp)
{
if (d < 0.0)
{
d += 6.2831853071795862;
}
}
else if (d > 0.0)
{
d -= 6.2831853071795862;
}
d /= cPieces;
rCosArcAngle = Math.Cos(d);
rSinArcAngle = Math.Sin(d);
}