public clsLine Normal()
{
clsLine functionReturnValue = default(clsLine);
//Special routine to help with finding "signed" distance of points to lines
double theta = 0;
theta = Angle;
functionReturnValue = new clsLine(0, 0, 0, 1);
functionReturnValue.Rotate(Angle);
return(functionReturnValue);
}
public clsPoint Intersect(clsCircle c1, bool firstSolution)
{
double a = 0;
clsLine l1 = default(clsLine);
if (mdlGeometry.Dist(Centre, c1.Centre) > Radius + c1.Radius)
{
return(null);
}
if (mdlGeometry.Dist(Centre, c1.Centre) < Abs(Radius - c1.Radius))
{
return(null);
}
l1 = new clsLine(Centre.Copy(), c1.Centre.Copy());
a = Acos((Radius * Radius + l1.Length * l1.Length - c1.Radius * c1.Radius) / (2 * Radius * l1.Length));
//Cosine rule
if (firstSolution == false)
{
a = -a;
}
l1.Rotate(a);
l1.Length = Radius;
return(l1.P2);
}