/// <summary>
/// Формула Герона для вычисления площади треугольника
/// </summary>
/// <param name="A"> Вершина А </param>
/// <param name="B"> Вершина В </param>
/// <param name="C"> Вершина С </param>
/// <returns> </returns>
public static double GetTriangleSquareByGeron(Point2D A, Point2D B, Point2D C)
{
if (!A.IsEmpty && !B.IsEmpty && !C.IsEmpty)
{
double a = Point2D.GetDistance(A, B);
double b = Point2D.GetDistance(B, C);
double c = Point2D.GetDistance(C, A);
double p = (a + b + c) / 2;
return(Math.Sqrt(p * (p - a) * (p - b) * (p - c)));
}
return(0);
}
public static double GetTriangleSquareByGeron(Frame2D A, Frame2D B, Frame2D C)
{
double a = Point2D.GetDistance(A.ToPoint2D(), B.ToPoint2D());
double b = Point2D.GetDistance(B.ToPoint2D(), C.ToPoint2D());
double c = Point2D.GetDistance(C.ToPoint2D(), A.ToPoint2D());
double p = (a + b + c) / 2;
double res = p;
res *= (p - a);
res *= (p - b);
res *= (p - c);
double result = Math.Sqrt(res);
if (double.IsNaN(result))
{
return(0);
}
return(result);
}