Question

A simple AI code for air hockey using unity3D? No need for boundaries and strikers

Answer 1

Player.cs

using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour {
BoxCollider coll;
Rigidbody striker;
GameObject st;
public float playerSpeed; //set value from inspector
public float strikerSpeed; //speed at which striker moves
AI ai;

void Awake() {
strikerSpeed = PlayerPrefs.GetFloat ("Striker_Speed");
}

// Use this for initialization
void Start () {
ai = GameObject.Find ("AI").GetComponent<AI> ();
coll = GameObject.Find ("Table").GetComponent<BoxCollider> ();
striker = GameObject.FindGameObjectWithTag ("Striker").GetComponent<Rigidbody> ();
st = GameObject.FindGameObjectWithTag ("Striker");
}

// Update is called once per frame
void Update () {
//Input to move the player
if (Input.GetKey ("left"))
transform.Translate (-playerSpeed * Time.deltaTime, 0f, 0f);
if (Input.GetKey ("right"))
transform.Translate (playerSpeed * Time.deltaTime, 0f, 0f);
if (Input.GetKey ("up"))
transform.Translate (0f, 0f, playerSpeed * Time.deltaTime);
if (Input.GetKey ("down"))
transform.Translate (0f, 0f, -playerSpeed * Time.deltaTime);

//Collision detection with edges, basically we are restricting player movement
if (transform.position.x <= -4.74f)
transform.position = new Vector3 (-4.74f, transform.position.y, transform.position.z);
if (transform.position.x >= 4.74f)
transform.position = new Vector3 (4.74f, transform.position.y, transform.position.z);
if (transform.position.z >= -1f)
transform.position = new Vector3 ( transform.position.x, transform.position.y, -1f);
if (transform.position.z <= -8.4f)
transform.position = new Vector3 ( transform.position.x, transform.position.y, -8.4f);



}

void OnCollisionEnter(Collision c) {
if (c.gameObject.tag == "Striker") {
ai.counter = 0f; //see AI.cs for explanation

//Controls to hit the striker
if (Input.GetKey ("space")) { //if you keep space pressed and up arrow key and then touch, stiker is smashed
  //---Control Part---
if (Input.GetKey ("up")) {
if (Input.GetKey ("right")) {
striker.velocity = new Vector3 (strikerSpeed, striker.velocity.y, strikerSpeed);
} else {
striker.velocity = new Vector3 (-strikerSpeed, striker.velocity.y, strikerSpeed);
}
}



}

else { //no space pressed and then touch then a gentle push is given

if (Input.GetKey ("right")) {
striker.velocity = new Vector3 (strikerSpeed * 0.5f, striker.velocity.y, strikerSpeed * 0.60f);
} else {
striker.velocity = new Vector3 (strikerSpeed * -0.5f, striker.velocity.y, strikerSpeed * 0.60f);
}
}
}

}

}

-------END OF Player.cs---------------

AI.cs

using UnityEngine;

using System.Collections;

public class AI : MonoBehaviour {

public float speed;

GameObject striker;

Rigidbody strikerRB;

float forceDir;

public float counter;

public float strikerSpeed;

Vector3 basePoint;

public float difficulty;

float smashCance;

void Awake() {

difficulty = PlayerPrefs.GetFloat ("Difficulty");

}

// Use this for initialization

void Start () {

striker = GameObject.FindGameObjectWithTag ("Striker");

strikerRB = GameObject.FindGameObjectWithTag ("Striker").GetComponent<Rigidbody> ();

//set difficulty

//based on the value the more the difficulty the more behind or close to the goal the ai is

//it plays defensive and gets extra time to think and play in high difficulty

//ideally difficuly = 1 must be invincible, if there are no game glitches

if (difficulty < 0.45f) { //easy

basePoint = new Vector3 (0.88f, transform.position.y, 0.85f);

difficulty = 0.2f;

} else if (difficulty >= 0.45f && difficulty < 1f) {

basePoint = new Vector3 (0.88f, transform.position.y, 3.3f);

difficulty = 0.7f;

}

else if(difficulty == 1f){

basePoint = new Vector3 (0.88f, transform.position.y, 6.65f);

}

}

// Update is called once per frame

void Update () {

counter += 1f * Time.deltaTime; //acts like a timer

Debug.Log (counter);

if(striker.transform.position.z >= -0.2f) { //if striker is in its half

if (counter >= 1f) { //wait for one second to see if the stiker comes to you or stops, if it does not come then :

Vector3 newPos = new Vector3 (striker.transform.position.x -0.5f, striker.transform.position.y, striker.transform.position.z + 0.5f);

//move towards the striker to its position

transform.position = Vector3.MoveTowards (transform.position, newPos, 4f * Time.deltaTime);

//4f * Time.deltaTime states time to transit the two positions

} else //if less than 1 second change your x-position based on difficulty, i.e. try to move closer to striker

transform.position = new Vector3 (striker.transform.position.x * difficulty, transform.position.y, transform.position.z);

}

else //if in other half then move towards base position

transform.position = Vector3.MoveTowards (transform.position, basePoint, 2f * Time.deltaTime);

}

void OnCollisionEnter(Collision c) {

if (c.gameObject.tag == "Striker") {

counter = 0f; //on hitting reset the wait time...

forceDir = (int)Random.Range (0, 10);//for hitting to the left or right

smashCance = (int)Random.Range (0, 10); //chance that it will smash the striker

//hit the striker with force

if (forceDir <= 5)

strikerRB.velocity = new Vector3 (-strikerSpeed, strikerRB.velocity.y, -strikerSpeed);

else

strikerRB.velocity = new Vector3 (strikerSpeed, strikerRB.velocity.y, -strikerSpeed);

}

}

}

--------END OF AI.cs---------

Striker.cs

using UnityEngine;
using System.Collections;

public class Striker : MonoBehaviour {
GameManager gm;

void Awake() {

}

// Use this for initialization
void Start () {
gm = GameObject.FindGameObjectWithTag ("MainCamera").GetComponent<GameManager> ();
}

// Update is called once per frame
void Update () {

}

void OnTriggerEnter(Collider c) {
if (c.tag == "AI_GOAL") {
gm.pScore += 1f;
gm.Reset (1);
}
if (c.tag == "PLAYER_GOAL") {
gm.eScore += 1f;
gm.Reset (0);
}
}


}

-----------END OF Striker.cs----------------




GameManager.cs

using UnityEngine;
using System.Collections;

public class GameManager : MonoBehaviour {
GameObject striker,player,ai,pS,eS; //pS - playerScore, eS - enemyScore

//for score
public float pScore,eScore; //p-player,e-enemy


// Use this for initialization
void Start () {
pScore = 0f;
eScore = 0f;
striker = GameObject.FindGameObjectWithTag ("Striker");
player = GameObject.FindGameObjectWithTag ("Player");
ai = GameObject.Find ("AI");
pS = GameObject.Find ("P_Score");
eS = GameObject.Find ("E_Score");
}

// Update is called once per frame
void Update () {

pS.gameObject.GetComponent<TextMesh> ().text = "YOU:" + pScore;
eS.gameObject.GetComponent<TextMesh> ().text = "OPP:" + eScore;
}

public void Reset(int status) {
//Reset all the gameObjects to original position to start a new game session
if (status == 1) //recieved when striker hits any goal, check Striker.cs
striker.transform.position = new Vector3 (0.06f, striker.transform.position.y, 2.82f);//if enemy wins,
//place on player side
else
striker.transform.position = new Vector3 (0.06f, striker.transform.position.y, -4.59f);

striker.gameObject.GetComponent<Rigidbody>().velocity = new Vector3 (0f,0f,0f);//stop the striker
player.transform.position = new Vector3 (0.88f, player.transform.position.y, -8.17f);
ai.transform.position = new Vector3 (0.88f, ai.transform.position.y, 6.65f);
}


}

-----------<END OF GameManager.cs>-------------