public Ellipse(double centerpointdblx, double centerpointdbly, double firstCDPx, double firstCDPy, double secondCDPx, double secondCDPy, double DX_start, double DY_start, double DX_end, double DY_end)
{
Ellipse.pointdbl pointdbl = new Ellipse.pointdbl();
this.B = pointdbl;
pointdbl = new Ellipse.pointdbl();
this.Rx = pointdbl;
pointdbl = new Ellipse.pointdbl();
this.Ry = pointdbl;
this.X = new Ellipse.pointdbl();
this.A.X = DX_start - centerpointdblx;
this.A.Y = DY_start - centerpointdbly;
this.B.X = DX_end - centerpointdblx;
this.B.Y = DY_end - centerpointdbly;
this.Rx.X = firstCDPx - centerpointdblx;
this.Rx.Y = firstCDPy - centerpointdbly;
this.Ry.X = firstCDPx - centerpointdblx;
this.Ry.Y = firstCDPy - centerpointdbly;
this.X.X = 1.0;
this.X.Y = 0.0;
this.theta1 = Math.Acos(this.DotProduct(this.A, this.Rx) / (this.Magnitude(this.A) * this.Magnitude(this.Rx)));
this.theta1 *= this.GetSign(this.A, this.Rx);
if (this.theta1 < 0.0)
{
this.theta1 = (this.theta1 + 3.1415926535897931) + 3.1415926535897931;
}
this.theta2 = Math.Acos(this.DotProduct(this.B, this.Rx) / (this.Magnitude(this.B) * this.Magnitude(this.Rx)));
this.theta2 *= this.GetSign(this.B, this.Rx);
if (this.theta2 < 0.0)
{
this.theta2 = (this.theta2 + 3.1415926535897931) + 3.1415926535897931;
}
this.weirdangle = Math.Acos(this.DotProduct(this.Rx, this.X) / (this.Magnitude(this.Rx) * this.Magnitude(this.X)));
this.weirdangle *= this.GetSign(this.Rx, this.X);
if (this.weirdangle < 0.0)
{
this.weirdangle = (this.weirdangle + 3.1415926535897931) + 3.1415926535897931;
}
this.deltatheta = this.theta2 - this.theta1;
this.x1 = (((Math.Cos(this.weirdangle) * this.Magnitude(this.Rx)) * Math.Cos(this.theta1)) + ((-Math.Sin(this.weirdangle) * this.Magnitude(this.Ry)) * Math.Sin(this.theta1))) + centerpointdblx;
this.y1 = (((Math.Sin(this.weirdangle) * this.Magnitude(this.Rx)) * Math.Cos(this.theta1)) + ((Math.Cos(this.weirdangle) * this.Magnitude(this.Ry)) * Math.Sin(this.theta1))) + centerpointdbly;
this.x2 = (((Math.Cos(this.weirdangle) * this.Magnitude(this.Rx)) * Math.Cos(this.theta2)) + ((-Math.Sin(this.weirdangle) * this.Magnitude(this.Ry)) * Math.Sin(this.theta2))) + centerpointdblx;
this.y2 = (((Math.Sin(this.weirdangle) * this.Magnitude(this.Rx)) * Math.Cos(this.theta2)) + ((Math.Cos(this.weirdangle) * this.Magnitude(this.Ry)) * Math.Sin(this.theta2))) + centerpointdbly;
if (Math.Abs(this.deltatheta) > 180.0)
{
this.fA = 1.0;
}
else
{
this.fA = 0.0;
}
if (this.deltatheta > 0.0)
{
this.fS = 1.0;
}
else
{
this.fS = 0.0;
}
}
private double GetSign(pointdbl vector1, pointdbl vector2)
{
if (((vector1.X * vector2.Y) - (vector1.Y * vector2.X)) >= 0.0)
{
return(-1.0);
}
return(1.0);
}
private double DotProduct(pointdbl vector1, pointdbl vector2)
{
return((vector1.X * vector2.X) + (vector1.Y * vector2.Y));
}
private double Magnitude(pointdbl vector)
{
return(Math.Sqrt(Math.Pow(vector.X, 2.0) + Math.Pow(vector.Y, 2.0)));
}
