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/* Libvisual-plugins - Standard plugins for libvisual
*
* Copyright (C) 2002, 2003, 2004, 2005, 2006 Dennis Smit <ds@nerds-incorporated.org>
*
* Authors: Dennis Smit <ds@nerds-incorporated.org>
*
* $Id: misc.c,v 1.5 2006/01/22 13:25:26 synap Exp $
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <fcntl.h>
#include <common.h>
#include <table.h>
#include <misc.h>
/* FIXME when using tables check radian sanity (!>= 2 PI | % TAB SIZE DUS ?); */
int _oink_line_x_next_rad (int x, int length, float rad)
{
/* return (_oink_table_sinlarge[(int) (rad * (OINK_TABLE_LARGE_SIZE / (PI * 2)))] * length) + x; */
return (sin (rad) * length) + x;
}
int _oink_line_y_next_rad (int y, int length, float rad)
{
/* return (_oink_table_coslarge[(int) (rad * (OINK_TABLE_LARGE_SIZE / (PI * 2)))] * length) + y; */
return (cos (rad + PI) * length) + y;
}
int _oink_line_length (int x0, int y0, int x1, int y1)
{
return sqrt (pow (y0 - y1, 2) + pow (x0 - x1, 2));
}
/* FIXME .. this.. could.. be.. a.. smaller.. and especially.. faster.. function :) */
int _oink_line_xory_next_xy (int xory, int length, int x0, int y0, int x1, int y1)
{
int dy = y1 - y0;
int dx = x1 - x0;
int stepx, stepy;
int fraction;
int pixdrawn = 0;
if(dy < 0)
{
dy = -dy;
stepy = -1;
}
else
{
stepy = 1;
}
if (dx < 0)
{
dx = -dx;
stepx = -1;
}
else
{
stepx = 1;
}
dy <<= 1;
dx <<= 1;
if (length == 0 && xory == 0)
return x0;
if (length == 0 && xory == 1)
return y0;
if (dx > dy)
{
fraction = dy - (dx >> 1);
while (x0 != x1)
{
if (fraction >= 0)
{
y0 += stepy;
fraction -= dx;
}
x0 += stepx;
fraction += dy;
pixdrawn++;
if (pixdrawn >= length)
{
if (xory == 0)
return x0;
else
return y0;
}
}
}
else
{
fraction = dx - (dy >> 1);
while (y0 != y1)
{
if (fraction >= 0)
{
x0 += stepx;
fraction -= dy;
}
y0 += stepy;
fraction += dx;
pixdrawn++;
if (pixdrawn >= length)
{
if (xory == 0)
return x0;
else
return y0;
}
}
}
if (xory == 0)
return x0;
else
return y0;
}
void _oink_pixel_rotate (int *x, int *y, int rot)
{
int tx = *x;
*x = (tx * _oink_table_cos[rot % OINK_TABLE_NORMAL_SIZE]) + (*y * _oink_table_sin[rot % OINK_TABLE_NORMAL_SIZE]);
*y = (tx * _oink_table_sin[rot % OINK_TABLE_NORMAL_SIZE]) - (*y * _oink_table_cos[rot % OINK_TABLE_NORMAL_SIZE]);
}
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