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line.c
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line.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* line.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: okupin <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2018/03/23 18:09:11 by okupin #+# #+# */
/* Updated: 2018/03/23 18:09:21 by okupin ### ########.fr */
/* */
/* ************************************************************************** */
#include "wolf3d.h"
static void wrd_line_params(t_world *wrd)
{
wrd->linedx = abs(X1 - X0);
wrd->linedy = abs(Y1 - Y0);
wrd->linesx = X1 >= X0 ? 1 : -1;
wrd->linesy = Y1 >= Y0 ? 1 : -1;
}
static void ft_draw_dx(t_world *wrd)
{
int error;
int i;
int x;
int y;
error = (wrd->linedy << 1) - wrd->linedx;
x = X0 + wrd->linesx;
y = Y0;
i = 1;
ft_px(wrd, X0, Y0, wrd->px);
while (i <= wrd->linedx)
{
if (error > 0)
{
error += (wrd->linedy - wrd->linedx) << 1;
y += wrd->linesy;
}
else
error += wrd->linedy << 1;
ft_px(wrd, x, y, wrd->px);
x += wrd->linesx;
i++;
}
}
static void ft_draw_dy(t_world *wrd)
{
int error;
int i;
int x;
int y;
error = (wrd->linedx << 1) - wrd->linedy;
y = Y0 + wrd->linesy;
x = X0;
i = 1;
ft_px(wrd, X0, Y0, wrd->px);
while (i <= wrd->linedy)
{
if (error > 0)
{
error += (wrd->linedx - wrd->linedy) << 1;
x += wrd->linesx;
}
else
error += wrd->linedx << 1;
ft_px(wrd, x, y, wrd->px);
y += wrd->linesy;
i++;
}
}
void ft_line(t_world *wrd)
{
wrd_line_params(wrd);
if (wrd->linedy <= wrd->linedx)
ft_draw_dx(wrd);
else
ft_draw_dy(wrd);
}