6 Make it complete

• Find source project in Shooter

Optimize game framework

Use inherit of C# class to manage characters and items in the game scene. Enemy and Player are all inherited from Actor. Actor can have weapons, fire, be damaged, die. Bullet and Weapon are all inherited from Item. Item can be picked up or used, initialized randomly, used by enemy or the player.

Use a game manager to handle global staff.

• Drop item system
• Record some game information
• Notify UI to display particular information

Set a text UI to display game information.

Item generate system

When a item drop order is triggered

• When an enemy dies

There is a particular probability to drop an item

• It has a drop probability parameter

The Manager takes over the generate process.

It use a strategy to decide which level item should be generated.

Then use item collection in this level to finally generate a random item inside it.

Item drop system

Write a script named EnemyDropItemProc that would be grabbed into an enemy or other item-droppable objects

There are some adjustable parameters in this class:

• Enemy Level The enemies can be divided into several levels, there are 5 levels in the Shooter Example. It more likes that the enemy will drop the same level items when they killed by the player. Particular level means special.
• Level Manager The pointer to the level manager in the scene. It will handle all item drop functions.
• Drop Item Per The probability of the enemy to drop items when is killed.

EnemyDropItemProc

public ItemLevel enemyLevel = ItemLevel.Level1;
    public LevelManager levelManager = null;
    public float dropItemPer = 0.1f; 
	// Use this for initialization
	void Start () {
        if (!levelManager)
        {
            levelManager = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent<LevelManager>();
        }	
	}
    public Item DropItem()
    {
        if (Random.Range(0f, 1f) < dropItemPer)
        {
            Debug.Log("Drop an item");
            return levelManager.GenerateRandomItem(transform);
        }
        return null;
}

Function DropItem will be called when the enemy is killed by the player

It would be called in Die function of Enemy script like this:

protected override void Die()
    {
        SendMessage("DropItem");
        lm.killEnemyNum++;
        GameObject.Destroy(gameObject);
    }

In script LevelManager, the function GenerateRandomItem, that will handle all random generate items process

It can generate random items based on the enemy item percentage and level

All droppable items would be managed in a script named ItemsCollection, it can return a random, use function GenerateRandomLevelItem, item from a particular item level list

This is the end of this tutorial.

More details, please visit the project here