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ft_line.c
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ft_line.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_line2.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: jpiniau <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2015/02/24 15:40:16 by jpiniau #+# #+# */
/* Updated: 2015/05/28 17:43:06 by jpiniau ### ########.fr */
/* */
/* ************************************************************************** */
#include "fdf.h"
#include "libft.h"
static int ft_draw_oct1(t_env *e, t_line l, t_dir d)
{
int incest;
int incnordest;
int error;
t_point p;
p.x = l.x1;
p.y = l.y1;
incest = 2 * d.y;
incnordest = 2 * (d.y - d.x);
error = 2 * d.y - d.x;
while (p.x <= l.x2)
{
ft_pixel_put(e, p, 0);
if (error >= 0)
{
p.y++;
error += incnordest;
}
else
error += incest;
p.x++;
}
return (0);
}
static int ft_draw_oct2(t_env *e, t_line l, t_dir d)
{
int incest;
int incnordest;
int error;
t_point p;
p.x = l.x1;
p.y = l.y1;
incest = 2 * d.x;
incnordest = 2 * (d.x - d.y);
error = 2 * d.x - d.y;
while (p.y <= l.y2)
{
ft_pixel_put(e, p, 0);
if (error >= 0)
{
p.x++;
error += incnordest;
}
else
error += incest;
p.y++;
}
return (0);
}
static int ft_draw_oct1_inv(t_env *e, t_line l, t_dir d)
{
int incest;
int incsudest;
int error;
t_point p;
p.x = l.x1;
p.y = l.y1;
d.y = ((d.y >= 0) ? d.y : -d.y);
incest = 2 * d.y;
incsudest = 2 * (d.y - d.x);
error = 2 * d.y - d.x;
while (p.x <= l.x2)
{
ft_pixel_put(e, p, 0);
if (error >= 0)
{
p.y--;
error += incsudest;
}
else
error += incest;
p.x++;
}
return (0);
}
static int ft_draw_oct2_inv(t_env *e, t_line l, t_dir d)
{
int incest;
int incsudest;
int error;
t_point p;
p.x = l.x1;
p.y = l.y1;
d.y = ((d.y >= 0) ? d.y : -d.y);
incest = 2 * d.x;
incsudest = 2 * (d.x - d.y);
error = 2 * d.x - d.y;
while (p.y >= l.y2)
{
ft_pixel_put(e, p, 0);
if (error >= 0)
{
p.x++;
error += incsudest;
}
else
error += incest;
p.y--;
}
return (0);
}
int ft_line(t_env *e, t_line l)
{
t_dir d;
l = (l.x1 > l.x2 ? ft_switch(l) : l);
d.x = l.x2 - l.x1;
d.y = l.y2 - l.y1;
if (d.x > d.y)
{
if (l.y1 <= l.y2)
ft_draw_oct1(e, l, d);
else
{
if ((l.y2 - l.y1) < (l.x1 - l.x2))
ft_draw_oct2_inv(e, l, d);
else
ft_draw_oct1_inv(e, l, d);
}
}
else
{
if (l.y1 <= l.y2)
ft_draw_oct2(e, l, d);
else
ft_draw_oct2_inv(e, l, d);
}
return (0);
}