jetpack-chan.cs

using UnityEngine;
using System.Collections;

public class PC : MonoBehaviour {

    // attributes
    public float moveSpeed;
    public GameObject bullet;
    public GameObject jetpackSmoke;
    public bool hit = false;
    public bool falling = false;
    public float specialTimer = 4.0f;
    public bool specialOK;
    public float invincibleTime = 0.0f;

    private int extraLives = 2;
    private float bulletCooldown = 0.0f;
    private bool usingSpecial = false;
    private float jetpackSmokeTime = 0.25f;

    private float screenHeight;
    private float screenWidth;
    public Animator animator;
    // private BoxCollider2D boxCollider;
    private SpriteRenderer spriteRenderer;

    bool facingRight;

    void Awake() {

        if (Application.loadedLevel == 1) // mode 1
            specialOK = false;
        else if (Application.loadedLevel == 2) // mode 2 (special attack variant)
            specialOK = true;

        moveSpeed = 3.0f;
        facingRight = true;
        screenHeight = Screen.height;
        screenWidth = Screen.width;

        animator = GetComponent<Animator>();
        // boxCollider = GetComponent<BoxCollider2D>();
        spriteRenderer = GetComponent<SpriteRenderer>();
    }

    void Start () {
    }

    void Update () {

        if (Input.GetKeyDown ("escape")) {
            Application.LoadLevel ("menu");
        }

        // map key presses to movement
        // use WASD to move
        float horizontal = Input.GetAxis ("Horizontal");
        float vertical = Input.GetAxis ("Vertical");

        if (horizontal != 0)
            horizontal *= moveSpeed;
        if (vertical != 0)
            vertical *= moveSpeed;

        // check for movement
        if (horizontal != 0 || vertical != 0) animator.SetBool("moving", true);
        else animator.SetBool ("moving", false);

        if (!falling)
            rigidbody2D.velocity = new Vector2(horizontal, vertical);
        if ((horizontal > 0 && !facingRight) || (horizontal < 0 && facingRight))
            flip();

        // check if activated special: can only use once
        // activate with spacebar
        if (Input.GetKeyDown ("space") && specialOK) {
            specialOK = false;
            usingSpecial = true;
        }

        // turn off special attack after a few seconds
        if (usingSpecial) {
            specialTimer = Mathf.Max (0, specialTimer - Time.deltaTime);
            if (specialTimer == 0) {
                usingSpecial = false;
            }
        }

        // check if shooting
        // use arrow keys to shoot
        if (!falling)
            updateShooting ();

        if (falling) {
            // fall to bottom of screen
            rigidbody2D.velocity += new Vector2(0, -0.4f);
            animator.SetBool ("hit", true);
        }
        else animator.SetBool("hit", false);

        updateInvincibility();

        // smoke trail
        if (!falling)
            updateSmoke();
    }

    void updateSmoke() {
        jetpackSmokeTime = Mathf.Max (0, jetpackSmokeTime - Time.deltaTime);

        if (jetpackSmokeTime > 0) return;

        Vector3 pos = new Vector3(transform.position.x-(Orient(0.25f)), transform.position.y-0.15f, transform.position.z+2.0f);
        Instantiate(jetpackSmoke, pos, Quaternion.identity);
        jetpackSmokeTime = 0.025f;
    }

    // world wrap-around if not hit:
    // respawn at center of screen if hit
    void OnBecameInvisible() {

        if (!hit) {
            Vector3 pos = Camera.main.WorldToScreenPoint (transform.position);
            if (pos.x < 0 || pos.x > screenWidth) {
                transform.position = new Vector2 (-transform.position.x, transform.position.y);
            }
            if (pos.y < 0 || pos.y > screenHeight) {
                transform.position = new Vector2 (transform.position.x, -transform.position.y);
            }
        }

        else if (falling && transform.position.y > 0) return;

        // if falling off-screen (at bottom only) due to damage and still have lives left
        else if (extraLives >= 0) {

            rigidbody2D.velocity = new Vector2(0, 0);
            transform.position = new Vector2(0, 0);
            invincibleTime = 2.0f;
            falling = false;
        }
        else {
            Application.LoadLevel ("gameover");
        }
    }

    void flip() {
        facingRight = !facingRight;
        Vector3 nextScale = transform.localScale;
        nextScale.x *= -1f;
        transform.localScale = nextScale;
    }

    // each key press checks if usingSpecial is turned ON:
    // if it is, fire an extra bullet in opposite direction.
    // usingSpecial turns off after a while (see Update() for details)
    void updateShooting() {
        float speed = 300f; // force to apply to bullet
        bool shoot = false; // only shoot if keys are pressed
        Vector3 bulletpos = new Vector3(transform.position.x, transform.position.y+0.02f, transform.position.z+1.0f); // place behind player
        Vector3 bulletforce = new Vector3(speed, speed);
        Vector3 directionVector = new Vector3 (0, 0); // used to pick shooting direction

        bulletCooldown = Mathf.Max (0, bulletCooldown - Time.deltaTime);

        if (bulletCooldown > 0) return;

        if (Input.GetKey ("up")) {
            directionVector = new Vector3(0, 1);
            shoot = true;
            bulletCooldown = 0.35f;
        }
        else if (Input.GetKey ("down")) {
            directionVector = new Vector3(0, -1);
            shoot = true;
            bulletCooldown = 0.35f;
        }
        else if (Input.GetKey ("left")) {
            directionVector = new Vector3(-1, 0);
            shoot = true;
            bulletCooldown = 0.35f;
        }
        else if (Input.GetKey ("right")) {
            directionVector = new Vector3(1, 0);
            shoot = true;
            bulletCooldown = 0.35f;
        }

        // bulletforce changes direction depending on which keys are pressed
        bulletforce.x *= directionVector.x;
        bulletforce.y *= directionVector.y;

        if (shoot) {
            GameObject bulletObject = (GameObject)Instantiate (bullet, bulletpos, Quaternion.identity);
            bulletObject.rigidbody2D.AddForce (bulletforce);

            // if in mode2 and special attack is active, shoot another bullet in the opposite direction
            if (usingSpecial) {
                GameObject bulletObject2 = (GameObject)Instantiate (bullet, bulletpos, Quaternion.identity);
                bulletObject2.rigidbody2D.AddForce (-bulletforce);
            }
        }
    }

    void updateInvincibility() {
        invincibleTime = Mathf.Max (0, invincibleTime - Time.deltaTime);
        Color nextColor = spriteRenderer.color;

        if (invincibleTime == 0) {
            nextColor.a = 1.0f;
            spriteRenderer.color = nextColor;
            hit = false;
        }
        else {
            nextColor.a = ((int)(invincibleTime*15)) % 2 == 0 ? 0.75f : 0.25f;
            spriteRenderer.color = nextColor;
        }
    }

    void getHit() {
        hit = true;
        falling = true;
        extraLives--;
        invincibleTime = 2.0f;

        rigidbody2D.velocity = new Vector2(0, 0);
        rigidbody2D.AddForce(new Vector2(0, 400));
    }

    float Orient(float f) {
        return facingRight ? f : -f;
    }
}