unity3d脚本之鸡零狗碎

1、键盘方向键移动对象

public class KeyboardMove : MonoBehaviour
{
private float speed = 5f;

void FixedUpdate ()
{
if (Input.GetAxis ("Horizontal") != 0 || Input.GetAxis ("Vertical") != 0) {
Vector2 movement = new Vector2 (Input.GetAxis ("Horizontal"), Input.GetAxis ("Vertical"));
transform.Translate (movement * speed * Time.deltaTime);
}
}
}

2、2d绑定对象的大小

gameObject.GetComponent<SpriteRenderer>().sprite.bounds.size.x;
gameObject.GetComponent<SpriteRenderer>().sprite.bounds.size.y;

3、从屏幕下方消失的时候，销毁对象

public class DestroyInvisible : MonoBehaviour {

void OnBecameInvisible ()
{
if (Camera.main != null) {
if (transform.position.y < Camera.main.ScreenToWorldPoint (new Vector3 (0f, 0f, 0f)).y) {
Destroy (gameObject);
}
} else {
Debug.Log("Camera.main is null.");
}
}
}

4、2D滚动视差背景

using UnityEngine;
using System.Collections;

public class parallaxY : MonoBehaviour {

public Transform[] backgrounds;
private float[] parallaxScales;
public float smoothing = 1f;
private Transform cam;
private Vector3 previousCamPos;

void Awake ()
{
cam = Camera.main.transform;
}

void Start ()
{
previousCamPos = cam.position;

parallaxScales = new float[backgrounds.Length];
for (int i=0; i<backgrounds.Length; i++) {
parallaxScales [i] = backgrounds [i].position.z * -1;
}
}

void Update ()
{
for (int i=0; i<backgrounds.Length; i++) {
float parallax=(previousCamPos.y -cam.position.y)*parallaxScales[i];
float backgroundTargetPosY=backgrounds[i].position.y+parallax;
Vector3 backgroundTargetPos = new Vector3(backgrounds[i].position.x,backgroundTargetPosY,backgrounds[i].position.z);
backgrounds[i].position=Vector3.Lerp(backgrounds[i].position,backgroundTargetPos,smoothing*Time.deltaTime);
}

previousCamPos = cam.position;
}
}