/// <summary>
/// Calculates a dot product of the contour
/// </summary>
public unsafe Complex Dot(Contour c, int shift)
{
var count = Count;
double sumA = 0;
double sumB = 0;
// fixed pointers -> .NET can't change the object it points to
fixed(Complex *ptr1 = &array[0])
fixed(Complex * ptr2 = &c.array[shift])
fixed(Complex * ptr22 = &c.array[0])
fixed(Complex * ptr3 = &c.array[c.Count - 1])
{
Complex *p1 = ptr1;
Complex *p2 = ptr2;
// for all vertices, multiply them with a SHIFT value
for (int i = 0; i < count; i++)
{
Complex x1 = *p1;
Complex x2 = *p2;
sumA += x1.a * x2.a + x1.b * x2.b;
sumB += x1.b * x2.a - x1.a * x2.b;
p1++;
if (p2 == ptr3)
{
p2 = ptr22;
}
else
{
p2++;
}
}
}
return(new Complex(sumA, sumB));
}
/// <summary>
/// Calculates dot product with given contour
/// </summary>
/// <returns></returns>
public Complex Dot(Contour c)
{
return(Dot(c, 0));
}