Miscellaneous
*************

Button
======

A UI Button is essentially a label with a button-like texture that can handle mouse events.

 
	* In the Hierarchy window, right click and add a **UI > Button - TextMeshPro**
	
		.. image:: button1.png
			:scale: 50%
	 
	
	* Use the Rect Tool to move/enlarge/shrink the button  
	
	* In the Inspector window, you can select colors for specific events:
	
		..  image:: redbutton.png
			:scale: 50%
	
 
	* In the Hierarchy, select the button
		
	* In the Inspector, find the *On Click()* Event section 
	
	.. image:: _onclick.png
		:scale: 50%
		
	* You need to link a GameObject and one of its internal function

		* This function will be called when the button is clicked
	
	
	
Variable qualifiers
===================

.. code-block:: csharp

	class test
	{

		[SerializeField] private float speed;    // show a private variable in the Inspector
		private const float maxspeed;			 // create const variable
		private static float nbinstances;		// class variable shared among instances, write test.nbinstances 
		[range(0f,100f)] [SerializeField] float test;	// limit range values of the variable in the Inspector
	}
		


Event Functions
===============


.. code-block:: csharp

	FixedUpdate() { ... }  // called  at a regular pace, useful for applying forces independently of the framerate
	Update(){...}
	LateUpdate() { .. }  // called after the completion of all the update() calls, useful when scripting a follow camera
	
	Awake() { ... } 	// called immediately after instantiation, before any call of the start() function, useful to load resources
	Start() { ... }     // called just before the first render on screen
	
Objects Pooling
===============

Instead of instantiating and destroying lots of objects, it is more effective to create a pool of objects, activate them when needed, and deactivate them instead of destroying them.

For this, we need to:

	* Create a bunch of objects at the beginning
	* Set up a list of objects in the spawn manager