blob: 662ea2591d6fde402a733fdf066b8d1093ce1882 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* mandelbrot.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/02/24 11:07:41 by cacharle #+# #+# */
/* Updated: 2020/02/26 13:12:55 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "fractol.h"
#define MANDEL_MAX_ITERATION 20
#define MANDEL_ESCAPE_RADIUS_SQUARED 4
int mandelbrot(t_state *state, t_complex c)
{
int n;
double zr;
double zi;
double zr_square;
double zi_square;
(void)state;
zr = c.r;
zi = c.i;
n = -1;
while (++n < state->iterations)
{
zi_square = zi * zi;
zr_square = zr * zr;
if (zr_square + zi_square > MANDEL_ESCAPE_RADIUS_SQUARED)
break;
zi = 2.0 * zr * zi;
zr = zr_square - zi_square;
zi += c.i;
zr += c.r;
}
return (n);
}
|
