linear_algebra.c


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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   linear_algebra.c                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cacharle <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/11/18 01:28:01 by cacharle          #+#    #+#             */
/*   Updated: 2019/11/18 01:32:41 by cacharle         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "cub3d.h"

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);
}