1 files changed, 40 insertions, 0 deletions
diff --git a/linear_algebra.c b/linear_algebra.c
new file mode 100644
index 0000000..881f8ff
--- /dev/null
+++ b/linear_algebra.c
@@ -0,0 +1,40 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   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);
+}