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/************************************************
mandel.c -
$Author$
************************************************/
#include "ruby.h"
#include "math.h"
static VALUE
mandel(self, re, im, max)
VALUE self;
VALUE re;
VALUE im;
VALUE max;
{
double real, image;
double z_real, z_image;
double tmp_real;
int maximum;
int i;
Check_Type(re, T_FLOAT);
Check_Type(im, T_FLOAT);
Check_Type(max, T_FIXNUM);
real = RFLOAT(re)->value;
image = RFLOAT(im)->value;
maximum = FIX2INT(max);
/***
z = c = Complex(re, im)
for i in 0 .. $max_deapth
z = (z * z) + c
break if z.abs > 2
end
return i
***/
z_real = real;
z_image = image;
for (i = 0; i < maximum; i++) {
tmp_real = ((z_real * z_real) - (z_image * z_image)) + real;
z_image = ((z_real * z_image) + (z_image * z_real)) + image;
z_real = tmp_real;
if ( ((z_real * z_real) + (z_image * z_image)) > 4.0 ) {
break;
}
}
return INT2FIX(i);
}
Init_mandel()
{
VALUE mMandel = rb_define_module("Mandel");
rb_define_module_function(mMandel, "mandel", mandel, 3);
}
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