private static bool SatisfyGeneralForm(Equation equation,
out Circle circle)
{
circle = null;
var term = equation.Lhs as Term;
if (term != null && term.Op.Method.Name.Equals("Add"))
{
var lst = term.Args as List<object>;
if (lst != null && lst.Count == 3)
{
bool isNum = LogicSharp.IsNumeric(lst[2]);
if (isNum)
{
double dNum;
LogicSharp.IsDouble(lst[2], out dNum);
dNum *= -1;
object coeffX, coeffY;
bool xTerm1 = IsXSquareTerm(lst[0], out coeffX);
bool yTerm1 = IsYSquareTerm(lst[1], out coeffY);
if (xTerm1 && yTerm1)
{
var pt = new Point(coeffX, coeffY);
circle = new Circle(pt, Math.Pow(dNum, 0.5));
return true;
}
}
}
}
return false;
}
public CircleSymbol(Circle _circle)
: base(_circle)
{
}
private static bool SatisfySpecialForm(Equation equation, out Circle circle)
{
circle = null;
bool isRhsNum = LogicSharp.IsNumeric(equation.Rhs);
if (!isRhsNum) return false;
double dNum;
LogicSharp.IsDouble(equation.Rhs, out dNum);
var term = equation.Lhs as Term;
if (term == null) return false;
if (!term.Op.Method.Name.Equals("Add")) return false;
var lst = term.Args as List<object>;
if (lst == null || lst.Count != 2) return false;
object coeffX, coeffY;
bool xTerm = IsXSquareTerm(lst[0], out coeffX);
bool yTerm = IsYSquareTerm(lst[1], out coeffY);
if (xTerm && yTerm)
{
var pt = new Point(coeffX, coeffY);
circle = new Circle(pt, Math.Pow(dNum,0.5));
return true;
}
xTerm = false;
yTerm = false;
xTerm = IsXSquareTerm(lst[1], out coeffX);
yTerm = IsYSquareTerm(lst[0], out coeffY);
if (xTerm && yTerm)
{
var pt = new Point(coeffX, coeffY);
circle = new Circle(pt, Math.Pow(dNum, 0.5));
return true;
}
return false;
}