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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* linear_algebra.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/11/18 01:28:01 by cacharle #+# #+# */
/* Updated: 2020/01/12 14:39:34 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "cub3d.h"
#define VECTOR_MINUS(v) vector_scale(v, -1.0)
#define VECTOR_SUB(v, w) vector_add(v, VECTOR_MINUS(w))
#define VECTOR_ADD_CONST(v, c) vector_add(v, vector_new(c, c))
t_vector vector_add(t_vector a, t_vector b)
{
a.x += b.x;
a.y += b.y;
return (a);
}
t_vector vector_scale(t_vector v, double scalar)
{
v.x *= scalar;
v.y *= scalar;
return (v);
}
/*
** rotate counter clockwise
*/
t_vector vector_rotate(t_vector v, double angle)
{
t_vector rotated;
rotated.x = cos(angle) * v.x - sin(angle) * v.y;
rotated.y = sin(angle) * v.x + cos(angle) * v.y;
return (rotated);
}
double vector_norm(t_vector v)
{
return (sqrt(SQUARE(v.x) + SQUARE(v.y)));
}
t_vector vector_new(double x, double y)
{
t_vector v;
v.x = x;
v.y = y;
return (v);
}
t_vector vector_apply(t_vector v, double (*f)(double))
{
v.x = f(v.x);
v.y = f(v.y);
return (v);
}
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