public void IterateTest()
{
Fixed128 zx = 0, zy = 0;
Fixed128 cx = new Fixed128(0, 0xa6aaaaaau, 0xaaaaaaaau, 0xaaaaaaabu);
Fixed128 cy = new Fixed128(-1, 0xfd555555u, 0x55555555u, 0x55555555u);
Assert.AreEqual("0.651041666666666666666666666670873924827845396295529219014841526558257100987248122692108154296875",
(string)cx);
Assert.AreEqual("-0.010416666666666666666666666670873924827845396295529219014841526558257100987248122692108154296875",
(string)cy);
double count = Fixed128.iterate(zx, zy, cx, cy, 255, Precision.Double);
double expected = 1 + 5 - Math.Log(Math.Log(255.08471462316811, 2), 2);
Assert.AreEqual(count, expected);
count = Fixed128.iterate(zx, zy, cx, cy, 255, Precision.LongDouble);
Assert.AreEqual(count, expected);
count = Fixed128.iterate(zx, zy, cx, cy, 255, Precision.Fixed64);
Assert.AreEqual(count, expected);
count = Fixed128.iterate(zx, zy, cx, cy, 255, Precision.Fixed128);
Assert.AreEqual(count, expected);
}
private static extern double iterate_cs(ref Fixed128 zx, ref Fixed128 zy,
ref Fixed128 cx, ref Fixed128 cy,
int maxiters, int arith);
private static extern void Fixed128_sub(ref Fixed128 r,
ref Fixed128 a,
ref Fixed128 b);
private static extern int Fixed128_str2_cs(ref Fixed128 r, string s);
private static extern void Fixed128_sqrt(ref Fixed128 r,
ref Fixed128 a);
private static extern void Fixed128_neg(ref Fixed128 r,
ref Fixed128 a);
private static extern int Fixed128_lt(ref Fixed128 r,
ref Fixed128 a);
private static extern void Fixed128_double2(ref Fixed128 r, double n);
private static unsafe extern IntPtr Fixed128_2str(byte* buffer, IntPtr bufsize,
ref Fixed128 a, int radix);
private static extern double Fixed128_2double(ref Fixed128 a);
/// <summary>
/// Calculate Mandelbrot set iteration
/// </summary>
/// <param name="zx">Starting real part</param>
/// <param name="zy">Starting imaginary part</param>
/// <param name="cx">Offset constant real part</param>
/// <param name="cy">Offset constant imaginary part</param>
/// <param name="maxiters">Maximum number of iterations</param>
/// <param name="precision">Precision to use</param>
/// <returns>Adjusted iteration count</returns>
public static double iterate(Fixed128 zx, Fixed128 zy,
Fixed128 cx, Fixed128 cy,
int maxiters, Precision precision)
{
return iterate_cs(ref zx, ref zy, ref cx, ref cy, maxiters, (int)precision);
}
public void ToDoubleTest()
{
Fixed128 a = new Fixed128(1, 0x80000000u, 0u, 0u);
double n = a;
Assert.AreEqual(1.5, n);
a = new Fixed128(-101, 0xE0000000u, 0u, 0u);
n = a;
Assert.AreEqual(-100.125, n);
}