42_INT_04_fdf/README.md

# FDF - fil de fer

### this is an exercise to discover 3D drawing, keyboard events, and pixel images manipulation

it reads a map, which is a simple text file like this :

```
0  0  0  0  0
0  0  0  0  0
0 10  0  0  0
0  0  0  0  0
0  0  0  0  0
```

and it converts it into a rectangular net, like a landscape with the height equal to the numbers :

![example 3D of map before modification](assets/fdf_demo_1.jpg)

we can modify the map to change the 3D drawing :

![example 3D of map after modifications](assets/fdf_demo_2.jpg)

### it is based on a library called [minilibx](https://github.com/42Paris/minilibx-linux), which is like a simplified version of X11

some of the difficulties of this program :

- finding the equations to transform a 2D drawing into a perspective
- drawing a line between two points
- bits manipulation for colors
- organization of the code to take care of all the events and transformations
- building images instead of asking the minilibx library to draw each pixel one by one

it can listen to keyboards events to transform the 3D, like turning around, zooming... :

**zoom :**

![example 3D of map after modifications](assets/fdf_loop_zoom_element.gif)

**turn :**

![example 3D of map after modifications](assets/fdf_loop_turn_left_pyramide.gif)
![example 3D of map after modifications](assets/fdf_loop_turn_down_pylone.gif)

**move :**

![example 3D of map after modifications](assets/fdf_loop_move_down_tube.gif)

**change height :**

![example 3D of map after modifications](assets/fdf_loop_change_height_50.gif)