changed rotation logic, pi is calculated by acos(-1) and the input ar…

…gument of rotation is degree

srcs/vector/vector_2.c

@@ -6,7 +6,7 @@
 /*   By: tsuchen <[email protected]>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/08/27 13:33:30 by tsuchen           #+#    #+#             */
-/*   Updated: 2024/08/27 14:28:36 by tsuchen          ###   ########.fr       */
+/*   Updated: 2024/08/27 15:32:46 by tsuchen          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -51,9 +51,13 @@ void	vec_rotate(t_vec *vec, double angle)
 {
 	double	new_x;
 	double	new_y;
+	double	pi;
+	double	angle_r;
 
-	new_x = vec->x * cos(angle) - vec->y * sin(angle);
-	new_y = vec->x * sin(angle) + vec->y * cos(angle);
+	pi = acos(-1);
+	angle_r = angle * pi / 180;	
+	new_x = vec->x * cos(angle_r) - vec->y * sin(angle_r);
+	new_y = vec->x * sin(angle_r) + vec->y * cos(angle_r);
 	vec->x = new_x;
 	vec->y = new_y;
 }