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/*
* Copyright 1994-2012 Olivier Girondel
*
* 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 "translation.h"
u_long id = 1071318964;
u_long options = BE_DISPLACE;
char dname[] = "Big half wheel";
char desc[] = "Translation effect";
/* Pour garder le centre de la translation bien visible dans le screen */
#define SHIFT_X (WIDTH / 10)
#define SHIFT_Y (HEIGHT / 10)
static Translation_t *t_bighalfwheel = NULL;
static int cx, cy;
const float q = 3.14159265399 / 2;
/* TODO check against original cthugha --oliv3 */
const float p = 45.0 / 180.0 * M_PI;
static Map_t
cth_bighalfwheel(u_short i, u_short j)
{
int dx, dy;
Map_t m;
if (j==0 || j == HEIGHT) {
dx = (float)(cx - i) * 0.75;
dy = cy - j;
} else {
int dist;
float ang;
dist = sqrt((i-cx)*(i-cx) + (j-cy)*(j-cy));
if (i==cx) {
if (j>cx)
ang = q;
else
ang = -q;
} else
ang = atanf((float)(j-cy)/(i-cx));
if (i<cx)
ang += M_PI;
if (dist < HEIGHT) {
dx = ceil(-sinf(ang-p)*dist/10.0);
dy = ceil(cosf(ang-p)*dist/10.0);
} else {
if (i<cx)
dx = 3;
else
dx = -3;
dy = 0;
}
if (i==0 || i==WIDTH) {
dx = cx - i;
dy = (float)(cy - j) * 0.75;
}
}
/* return abs(i+dx + ((j+dy)*WIDTH)) % BUFFSIZE; */
m.map_x = abs((i+dx) % WIDTH);
m.map_y = abs((j+dy) % HEIGHT);
return m;
}
static void
init_params()
{
cx = b_rand_int_range(SHIFT_X, (MAXX - SHIFT_X));
cy = b_rand_int_range(SHIFT_Y, (MAXY - SHIFT_Y));
}
void
on_switch_on()
{
Translation_batch_init(t_bighalfwheel);
}
void
create(__attribute__ ((unused)) Context_t *ctx)
{
t_bighalfwheel = Translation_new(&cth_bighalfwheel, &init_params);
}
void
destroy(__attribute__ ((unused)) Context_t *ctx)
{
Translation_delete(t_bighalfwheel);
}
void
run(Context_t *ctx)
{
Translation_run(t_bighalfwheel, ctx);
}
#ifndef EVT_DAWA
#ifdef HAVE_SDL_H
u_char
on_SDL_Event(SDL_Event *e)
{
if (key(e, SDLK_n)) {
on_switch_on();
return 1;
}
return 0;
}
#endif /* HAVE_SDL_H */
#endif
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