unity3d脚本之鸡零狗碎

这里记录的是unity3d开发中用到的鸡零狗碎的代码片段。

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

从老外那抄的，原理我说不清楚，这个是纵轴，也就是Y轴滚动

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;
  }
}

背景作为数组，对象的position.Z影响移动速度