diff --git a/README.md b/README.md
index 39af52c..58cecca 100644
--- a/README.md
+++ b/README.md
@@ -26,4 +26,8 @@ This README would normally document whatever steps are necessary to get your app
 ### Who do I talk to? ###
 
 * Repo owner or admin
-* Other community or team contact
\ No newline at end of file
+* Other community or team contact
+
+### ressources
+https://harm-smits.github.io/42docs/libs/minilibx
+https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
diff --git a/builds/fdf.o b/builds/fdf.o
index 3a333a5..455ccee 100644
Binary files a/builds/fdf.o and b/builds/fdf.o differ
diff --git a/fdf b/fdf
index fcf38b3..41239ca 100755
Binary files a/fdf and b/fdf differ
diff --git a/srcs/fdf.c b/srcs/fdf.c
index 78f1155..9895b57 100644
--- a/srcs/fdf.c
+++ b/srcs/fdf.c
@@ -4,35 +4,50 @@
 t_fdf	*init_fdf(void);
 int		print_keycode(int keycode);
 int		shut_down(t_fdf *fdf);
+void	draw_image(t_fdf *fdf);
 void	draw_pixel(t_fdf *fdf, int x, int y, int color);
+void	draw_color_pixel(t_fdf *fdf, int new_x, int new_y, int z);
 int		keypress(int keycode, t_fdf *fdf);
 void	rotation_state(t_fdf *fdf);
 int		**parse_map(t_fdf *fdf);
+int		*new_coordinates(t_fdf *fdf, int i, int j);
 
-void	color_altitude_pixel(t_fdf *fdf, int new_x, int new_y, int z)
+// return an int[3] : int[0] = x, int[1] = y, int[2] = z
+int	*new_coordinates(t_fdf *fdf, int i, int j)
 {
-	int color;
+	int x;
+	int y;
+	int z;
+	int	*point;
 
-	color = 0xffffff;
-	z = z / fdf->altitude;
-	if (z)
-	{
-		color = color ^ (((0xff / fdf->max_z) * z) << 8 );
-		color = color ^ ((0xff / fdf->max_z) * z);
-		ft_printf("0xff:%i    z:%i    (0xff / max_z):%i    ((0xff / max_z) * z):%i\n", 0xff, z, (0xff / fdf->max_z), ((0xff / fdf->max_z) * z));
-	}
-	draw_pixel(fdf, new_x, new_y, color);
+	point = ft_calloc(3, sizeof(int));
+	x = i * fdf->offset - (fdf->map_size_x / 2);
+	y = j * fdf->offset - (fdf->map_size_y / 2);
+	z = fdf->map[j][i] * fdf->altitude;
+	point[0] = x * cos(fdf->rad_x) + y * sin(fdf->rad_x);
+	point[1] = y * cos(fdf->rad_x) - x * sin(fdf->rad_x);
+	point[1] = point[1] * cos(fdf->rad_y) - -z * sin(fdf->rad_y);
+	point[0] += fdf->margin + fdf->mov_x + (fdf->map_size_x / 2);
+	point[1] += fdf->margin + fdf->mov_y + (fdf->map_size_y / 2);
+	point[2] = z;
+	return (point);
+}
+
+// point[0], point[1], point[2] -> new x, new y, new z
+void	draw_lines(t_fdf *fdf, int i, int j)
+{
+	int *point_start;
+	int *point_end;
+
+	point_start = new_coordinates(fdf, i, j);
+	point_end = new_coordinates(fdf, i, j);
+	draw_color_pixel(fdf, point_start[0], point_start[1], point_start[2]);
 }
 
 void	draw_image(t_fdf *fdf)
 {
 	int i;
 	int j;
-	int x;
-	int y;
-	int z;
-	int new_x;
-	int new_y;
 
 	// init image with 0
 	i =-1;
@@ -44,18 +59,7 @@ void	draw_image(t_fdf *fdf)
 	{
 		i = -1;
 		while (++i < fdf->map_width)
-		{
-			
-			x = i * fdf->offset - (fdf->map_size_x / 2);
-			y = j * fdf->offset - (fdf->map_size_y / 2);
-			z = fdf->map[j][i] * fdf->altitude;
-			new_x = x * cos(fdf->rad_x) + y * sin(fdf->rad_x);
-			new_y = y * cos(fdf->rad_x) - x * sin(fdf->rad_x);
-			new_y = new_y * cos(fdf->rad_y) - -z * sin(fdf->rad_y);
-			new_x += fdf->margin + fdf->mov_x + (fdf->map_size_x / 2);
-			new_y += fdf->margin + fdf->mov_y + (fdf->map_size_y / 2);
-			color_altitude_pixel(fdf, new_x, new_y, z);
-		}
+			draw_lines(fdf, i, j);
 	}
 	// put image on screen
 	mlx_put_image_to_window(fdf->mlx_ptr, fdf->win_ptr, fdf->img_ptr, 0, 0);
@@ -85,9 +89,9 @@ int		keypress(int keycode, t_fdf *fdf)
 	if (keycode == ESCAPE)
 		shut_down(fdf);
 	else if (keycode == LEFT)
-		(fdf->rot_x) -= 1;
-	else if (keycode == RIGHT)
 		(fdf->rot_x) += 1;
+	else if (keycode == RIGHT)
+		(fdf->rot_x) -= 1;
 	else if (keycode == UP)
 		(fdf->rot_y) += 1;
 	else if (keycode == DOWN)
@@ -131,6 +135,20 @@ void	draw_pixel(t_fdf *fdf, int x, int y, int color)
 	*(unsigned int*)(fdf->img_addr + position) = color;
 }
 
+void	draw_color_pixel(t_fdf *fdf, int new_x, int new_y, int z)
+{
+	int color;
+
+	color = 0xffffff;
+	z = z / fdf->altitude;
+	if (z)
+	{
+		color = color ^ (((0xff / fdf->max_z) * z) << 8 );
+		color = color ^ ((0xff / fdf->max_z) * z);
+	}
+	draw_pixel(fdf, new_x, new_y, color);
+}
+
 void	rotation_state(t_fdf *fdf)
 {
 	char	*position;