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/*
* Copyright 1994-2022 Olivier Girondel
* Copyright 2014-2022 Frantz Balinski
*
* This file is part of lebiniou.
*
* lebiniou is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* lebiniou is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with lebiniou. If not, see <http://www.gnu.org/licenses/>.
*/
#include "brandom.h"
#include "context.h"
#include "translation.h"
#include "point2d.h"
uint32_t version = 0;
uint32_t options = BO_DISPLACE;
char desc[] = "Poly-spirals effect";
char dname[] = "Spirals";
static Translation_t *t_spiral = NULL;
#define NUMCENTERS (16)
static Point2d_t centers[NUMCENTERS];
#define DELTA_ANGLE (M_PI_4)
static void init_params(void);
static Map_t cth_spiral(const short, const short);
static inline float
hypof(const float x, const float y)
{
return sqrtf(x*x + y*y);
}
int8_t
create(Context_t *ctx)
{
t_spiral = Translation_new(&cth_spiral, &init_params);
return 1;
}
void
destroy(Context_t *ctx)
{
if (NULL != t_spiral) {
Translation_delete(t_spiral);
}
}
void
run(Context_t *ctx)
{
Translation_run(t_spiral, ctx);
}
void
on_switch_on(Context_t *ctx)
{
Translation_batch_init(t_spiral);
}
static void
init_params(void)
{
for (int16_t i = 0; i < NUMCENTERS; i++) {
centers[i].x = b_rand_uint32_range(MINX, MAXX + 1);
centers[i].y = b_rand_uint32_range(MINY, MAXY + 1);
}
}
static Map_t
cth_spiral(const short xx, const short yy)
{
Map_t m;
float dx, dy;
float radius = hypof(WIDTH >> 2, HEIGHT >> 2);
float x = xx;
float y = yy;
for (int16_t i = 0; i < NUMCENTERS; i++) {
float cx = centers[i].x;
float cy = centers[i].y;
if ((y == MINY) || (y == MAXY)) {
dx = ((cx - x) * 3) / 4;
dy = cy - y;
} else if ((x == MINX) || (x == MAXX)) {
dx = cx - x;
dy = ((cy - y) * 3) / 4;
} else {
dx = x - cx;
dy = y - cy;
float dist = hypof(dx, dy);
if (dist < radius) {
float ang = atan2f(dy, dx) - DELTA_ANGLE;
dist /= 10;
dx = -sinf(ang) * dist;
dy = cosf(ang) * dist;
} else {
dx = dy = 0;
}
}
x += dx;
y += dy;
}
m.map_x = x;
m.map_y = y;
return m;
}
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