Godot Lesson 1: Player Movement
=======================================

Summary
--------

This lesson covers player movement and collision with walls.

Prerequisites
--------------

* Godot Installed

Video
--------

.. raw:: html

   <iframe width="560" height="315" src="https://www.youtube.com/embed/4CLvL05Av6g" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>


Code
--------

Repository: https://github.com/los-alamos-steam-lab/godot-tutorial/tree/1-movement-and-collision

Player Code
^^^^^^^^^^^^^^^^^^^^

.. code-block:: gdscript

    extends KinematicBody2D

    const SPEED = 70
    var movedir = Vector2(0,0)


    # _physics_process is called by the game engine
    func _physics_process(delta):
        controls_loop()
        movement_loop()
        
    # controls_loop looks for player input
    func controls_loop():
        var LEFT		= Input.is_action_pressed("ui_left")
        var RIGHT	= Input.is_action_pressed("ui_right")
        var UP		= Input.is_action_pressed("ui_up")
        var DOWN		= Input.is_action_pressed("ui_down")
        
        # By adding our values together, we make it so that one key 
        # stroke does not take precidence over another, i.e. pushing 
        # left and right keys at the same time
        movedir.x = -int(LEFT) + int(RIGHT)
        movedir.y = -int(UP) + int(DOWN)
        
    # movement_loop makes the character move
    func movement_loop():
        # .normalized makes it so that diagonal movement is 
        # the same length as 4-driectional movement
        var motion = movedir.normalized() * SPEED
        
        # move_and_slide takes care of collisions and has you slide 
        # along walls that are blocking your path
        move_and_slide(motion, Vector2(0,0))