aboutsummaryrefslogtreecommitdiff
path: root/algorithms/burning-ship.c
blob: 6aea927f94bbda4c0ef8518db3136ffe9ec24c6b (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
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
/*
 * Part of fractal-gen - Generate iteration-based fractals in PNM format
 * Copyright (c) 2016 David Phillips <dbphillipsnz@gmail.com>
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "common.h"

void *generate_burning_ship_section(void *section)
{
	data_section *d = (data_section*)section;
	unsigned int x,y,i;
	double a,b;
	double complex z,c;
	double size_units = 3.5f;
	double top = -2.2f;
	double left = -2.2f;

	/* FIXME document this */
	b = clust_id*(size_units/size)+top; /* FIXME document this */

	for (y = clust_id; y < size; y += clust_total)
	{
		a = d->core*(size_units/size)+left;
		for (x = d->core; x < size; x += cores)
		{
			z = 0;
			c = a+I*b;
			for (i = 0; i < iterat; i++)
			{
				if (cabs(z) >= 2)
					break;

				z = cpow( fabs(creal(z)) + I*fabs(cimag(z)) , power) + c;
			}
			d->data[d->idx++] = (255*i)/iterat;
			a += cores*(size_units/size);
		}
		b += clust_total*(size_units/size);
	}
	return NULL;
}