diff options
Diffstat (limited to 'src/fractals/mandelbrot.c')
| -rw-r--r-- | src/fractals/mandelbrot.c | 34 |
1 files changed, 15 insertions, 19 deletions
diff --git a/src/fractals/mandelbrot.c b/src/fractals/mandelbrot.c index 662ea25..312fc71 100644 --- a/src/fractals/mandelbrot.c +++ b/src/fractals/mandelbrot.c @@ -6,37 +6,33 @@ /* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */ /* +#+#+#+#+#+ +#+ */ /* Created: 2020/02/24 11:07:41 by cacharle #+# #+# */ -/* Updated: 2020/02/26 13:12:55 by cacharle ### ########.fr */ +/* Updated: 2020/02/27 14:18:16 by cacharle ### ########.fr */ /* */ /* ************************************************************************** */ #include "fractol.h" -#define MANDEL_MAX_ITERATION 20 -#define MANDEL_ESCAPE_RADIUS_SQUARED 4 +#define MANDEL_ESCAPE_RADIUS_SQUARED 4.0 int mandelbrot(t_state *state, t_complex c) { - int n; - double zr; - double zi; - double zr_square; - double zi_square; + int n; + t_complex z; + t_complex z_square; (void)state; - zr = c.r; - zi = c.i; + z = c; n = -1; - while (++n < state->iterations) + z_square.r = 0.0; + z_square.i = 0.0; + while (z_square.r + z_square.i <= MANDEL_ESCAPE_RADIUS_SQUARED && ++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; + z_square.i = z.i * z.i; + z_square.r = z.r * z.r; + z.i = 2.0 * z.r * z.i; + z.r = z_square.r - z_square.i; + z.i += c.i; + z.r += c.r; } return (n); } |