Videogames Development – Unity – How to add a script

ADD SCRIPT

1. MAIN TOP MENU> Assets> Create Javascript

2. Assets> select NewBehaviourScript Import Setting

3. Inspector> ‘Open’ button, it starts MonoDevelop-Unity editor

4. Write: 

function Start() 
{
    print( "Hello, world" );
}

5. MAIN TOP MENU> GameObject> Create Empty

6. Hierarchy> select ‘GameObject’ you have just created> Inspector> ‘Add Component’> Scripts> NewBehaviourScript

7. Play button> BOTTOM LEFT you will see ‘Hello, world’

BASIC STRUCTURE

#pragma strict

function Start()
{
  ... it runs one time when game start ...  
}

function Update()
{
  ... it runs every frame ...
}

NOTICE:
#pragma is a pre-compiler directive. ie it tells the compiler what to do or how to behave.
With #pragma you must tell of what type the variable will be and it will give you an error if you don’t comply.

ADVANCED STRUCTURE WITH FUNCTIONES

#pragma strict

var... declare initial value of variables -> DEFAULT ACCESS IS PUBLIC

// Single line comment

/*
Multiline comment
*/

function Start()
{
  ... it runs one time when game start ...  
}

Myfunction()
{
  ... the other funcions ...  
}


function Update()
{
  ... it runs every frame ...
Myfunction(); // call external functions
}

AWAKE – START – UPDATE

#pragma strict

function Awake ()
{
    ... setup ammo for the enemy ... 
    it starts at first, even component is not enable
}


function Start ()
{
    ... allow enemy to shoot ... 
    it starts when component is enabled
}

function Update()
{
    ... hits control ... 
    it is called once per frame to control data changes over time, use this to:
    - moving non physics objects
    - simple timers
    - receiving input
    NOTICE: update interval times vary
    RESULT SAMPLE OVER TIME: 0.01656623 - 0.01656666 - 0.01656696 (it changes)
}
function FixedUpdate()
{
    ... hits control ... 
    it is called at fixed update intervals:
    - called every physics step
    - fixed update intervals are consistent
    - regular updates: adjusting physics objects
    NOTICE: update interval times is constant
    RESULT SAMPLE OVER TIME: 0.02 - 0.02 - 0.02 (it does not change)
}