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Diffstat (limited to 'src/fractals/julia.c')
| -rw-r--r-- | src/fractals/julia.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/fractals/julia.c b/src/fractals/julia.c index e69de29..d1afb46 100644 --- a/src/fractals/julia.c +++ b/src/fractals/julia.c @@ -0,0 +1,41 @@ +/* ************************************************************************** */ +/* */ +/* ::: :::::::: */ +/* julia.c :+: :+: :+: */ +/* +:+ +:+ +:+ */ +/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */ +/* +#+#+#+#+#+ +#+ */ +/* Created: 2020/02/24 15:17:38 by cacharle #+# #+# */ +/* Updated: 2020/02/24 15:36:04 by cacharle ### ########.fr */ +/* */ +/* ************************************************************************** */ + +#include "fractol.h" + +#define JULIA_MAX_ITERATION 20 +#define JULIA_ESCAPE_RADIUS_SQUARED 100 + +int julia(t_state *state, t_complex z) +{ + int n; + double zr; + double zi; + double zr_square; + double zi_square; + + zr = z.r; + zi = z.i; + n = -1; + while (++n < JULIA_MAX_ITERATION) + { + zi_square = zi * zi; + zr_square = zr * zr; + if (zr_square + zi_square > JULIA_ESCAPE_RADIUS_SQUARED) + break; + zi = 2.0 * zr * zi; + zr = zr_square - zi_square; + zi += state->julia_const.i; + zr += state->julia_const.r; + } + return (n); +} |