Add input mapping to creeps tutorial (#5383)

* Add input mapping to creeps tutorial

getting_started/first_2d_game/03.coding_the_player.rst

@@ -139,8 +139,36 @@ First, we need to check for input - is the player pressing a key? For this game,
 we have 4 direction inputs to check. Input actions are defined in the Project
 Settings under "Input Map". Here, you can define custom events and assign
 different keys, mouse events, or other inputs to them. For this game, we will
-just use the default events called "ui_right" etc that are assigned to the arrow
-keys on the keyboard.
+map the arrow keys to the four directions.
+
+Click on *Project -> Project Settings* to open the project settings window and
+click on the *Input Map* tab at the top. Type "move_right" in the top bar and
+click the "Add" button to add the ``move_right`` action.
+
+.. image:: img/input-mapping-add-action.png
+
+We need to assign a key to this action. Click the "+" icon on the right, then
+click the "Key" option in the drop-down menu. A dialog asks you to type in the
+desired key. Press the right arrow on your keyboard and click "Ok".
+
+.. image:: img/input-mapping-add-key.png
+
+Repeat these steps to add three more mappings:
+
+1. ``move_left`` mapped to the left arrow key.
+2. ``move_up`` mapped to the up arrow key.
+3. And ``move_down`` mapped to the down arrow key.
+
+Your input map tab should look like this:
+
+.. image:: img/input-mapping-completed.png
+
+Click the "Close" button to close the project settings.
+
+.. note::
+
+   We only mapped one key to each input action, but you can map multiple keys,
+   joystick buttons, or mouse buttons to the same input action.
 
 You can detect whether a key is pressed using ``Input.is_action_pressed()``,
 which returns ``true`` if it's pressed or ``false`` if it isn't.
@@ -150,13 +178,13 @@ which returns ``true`` if it's pressed or ``false`` if it isn't.
 
     func _process(delta):
         var velocity = Vector2.ZERO # The player's movement vector.
-        if Input.is_action_pressed("ui_right"):
+        if Input.is_action_pressed("move_right"):
             velocity.x += 1
-        if Input.is_action_pressed("ui_left"):
+        if Input.is_action_pressed("move_left"):
             velocity.x -= 1
-        if Input.is_action_pressed("ui_down"):
+        if Input.is_action_pressed("move_down"):
             velocity.y += 1
-        if Input.is_action_pressed("ui_up"):
+        if Input.is_action_pressed("move_up"):
             velocity.y -= 1
 
         if velocity.length() > 0:
@@ -171,22 +199,22 @@ which returns ``true`` if it's pressed or ``false`` if it isn't.
     {
         var velocity = Vector2.Zero; // The player's movement vector.
 
-        if (Input.IsActionPressed("ui_right"))
+        if (Input.IsActionPressed("move_right"))
         {
             velocity.x += 1;
         }
 
-        if (Input.IsActionPressed("ui_left"))
+        if (Input.IsActionPressed("move_left"))
         {
             velocity.x -= 1;
         }
 
-        if (Input.IsActionPressed("ui_down"))
+        if (Input.IsActionPressed("move_down"))
         {
             velocity.y += 1;
         }
 
-        if (Input.IsActionPressed("ui_up"))
+        if (Input.IsActionPressed("move_up"))
         {
             velocity.y -= 1;
         }

getting_started/first_2d_game/07.finishing-up.rst

@@ -45,16 +45,23 @@ Since the game is played with keyboard controls, it would be convenient if we
 could also start the game by pressing a key on the keyboard. We can do this with
 the "Shortcut" property of the ``Button`` node.
 
+In a previous lesson, we created four input actions to move the character. We
+will create a similar input action to map to the start button.
+
+Select "Project" -> "Project Settings" and then click on the "Input Map"
+tab. In the same way you created the movement input actions, create a new
+input action called ``start_game`` and add a key mapping for the :kbd:`Enter`
+key.
+
 In the ``HUD`` scene, select the ``StartButton`` and find its *Shortcut*
 property in the Inspector. Select "New Shortcut" and click on the "Shortcut"
 item. A second *Shortcut* property will appear. Select "New InputEventAction"
 and click the new "InputEventAction". Finally, in the *Action* property, type
-the name ``ui_select``. This is the default input event associated with the
-spacebar.
+the name ``start_game``.
 
 .. image:: img/start_button_shortcut.png
 
-Now when the start button appears, you can either click it or press :kbd:`Space`
+Now when the start button appears, you can either click it or press :kbd:`Enter`
 to start the game.
 
 And with that, you completed your first 2D game in Godot.