unity常用API（四）

unity常用API（四）

个人英语不好，所以看的是2018.1 的中文API 部分代码和解释都来源于此文档：原文链接

视频链接：点击链接

Physics

1. Raycast ： 向场景中的所有碰撞体投射一条射线，该射线起点为 /origin/，朝向 /direction/，长度为 /maxDistance/。

        // 接受一个射线
        Ray ray = new Ray(transform.position+transform.forward,transform.forward);
        bool isCollider = Physics.Raycast(ray);
        Debug.Log(isCollider);
        void Update()
        {
            Ray ray = new Ray(transform.position+transform.forward,transform.forward);
            //bool isCollider = Physics.Raycast(ray);
            // 射线的距离
            //bool isCollider = Physics.Raycast(ray, 1);
            RaycastHit hit; 
            //bool isCollider = Physics.Raycast(ray, out hit);
            //Debug.Log(hit.point);  // 获取捕获的点
            //Debug.Log(hit.collider);   // 碰撞的游戏物体
            //
            // 碰撞 layer 为xx的层 
            // bool isCollider = Physics.Raycast(ray, Mathf.Infinity,LayerMask.GetMask("xx")); 
        }
        //2D
        Physics2D.Raycast();

UGUI 事件监听

```c#
    public GameObject btnGameObject;    // 按钮
    public GameObject sliderGameObject; // 滑动
    public GameObject dropDownGameObject;    //下拉
    public GameObject toggleGameObject;    // 勾选

    // Use this for initialization
    void Start () {
        btnGameObject.GetComponent<Button>().onClick.AddListener(this.ButtonOnClick);
        sliderGameObject.GetComponent<Slider>().onValueChanged.AddListener(this.OnSliderChanged);
        dropDownGameObject.GetComponent<Dropdown>().onValueChanged.AddListener(this.OnDropDownChanged);
        toggleGameObject.GetComponent<Toggle>().onValueChanged.AddListener(this.OnToggleChanged);
    }

    void ButtonOnClick()
    {
        Debug.Log("ButtonOnClick");
    }
    void OnSliderChanged(float value)
    {
        Debug.Log("SliderChanged:" + value);
    }
    void OnDropDownChanged(Int32 value)
    {
        Debug.Log("DropDownChanged:" + value);
    }
    void OnToggleChanged(bool value)
    {
        Debug.Log("ToggleChanged:" + value);
    }
```

```c#
    // 实现接口 UI,EventSystem
     //interface
    public class UIEventManager2 : MonoBehaviour//, IPointerDownHandler,IPointerClickHandler,IPointerUpHandler,IPointerEnterHandler,IPointerExitHandler
        ,IBeginDragHandler,IDragHandler,IEndDragHandler,IDropHandler
    {
        public void OnBeginDrag(PointerEventData eventData)
        {
            Debug.Log("OnBeginDrag");
        }

        public void OnDrag(PointerEventData eventData)
        {
            Debug.Log("OnDrag");
        }

        public void OnDrop(PointerEventData eventData)
        {
            Debug.Log("OnDrop");
        }

        public void OnEndDrag(PointerEventData eventData)
        {
            Debug.Log("OnEndDrag");
        }

        public void OnPointerClick(PointerEventData eventData)
        {
            Debug.Log("OnPointerClick");
        }

        public void OnPointerDown(PointerEventData eventData)
        {
            Debug.Log("OnPointerDown");
        }

        public void OnPointerEnter(PointerEventData eventData)
        {
            Debug.Log("OnPointerEnter");
        }

        public void OnPointerExit(PointerEventData eventData)
        {
            Debug.Log("OnPointerExit");
        }

        public void OnPointerUp(PointerEventData eventData)
        {
            Debug.Log("OnPointerUp");
        }
    }

```

其他

1. Camera
   ScreenPointToRay : 返回从摄像机通过屏幕点的光线。

    private Camera camera;
    // Use this for initialization
    void Start () {
        camera = Camera.main;
    }
    // Update is called once per frame
    void Update () {
        Ray ray = camera.ScreenPointToRay(Input.mousePosition);
        //Debug.DrawRay(ray.origin, ray.direction);
        //Debug.DrawLine(ray.origin, ray.origin + ray.direction * 100);
        RaycastHit hit;
        bool isCollider = Physics.Raycast(ray, out hit);
        Debug.Log(hit.collider);
    }

2. CharacterController : 可使您轻松进行受碰撞约束的移动，同时不必处理刚体。

        public float speed = 3;
        private CharacterController cc;
        // Use this for initialization
        void Start () {
            cc = GetComponent<CharacterController>(); 
        }
        // Update is called once per frame
        void Update () {
            float h = Input.GetAxis("Horizontal");
            float v = Input.GetAxis("Vertical");
            cc.SimpleMove(new Vector3(h, 0, v) * speed);
            //cc.Move(new Vector3(h, 0, v) * speed * Time.deltaTime);
            Debug.Log(cc.isGrounded);
        }
        private void OnControllerColliderHit(ControllerColliderHit hit) // 检测碰撞
        {
            Debug.Log(hit.collider);
        }

3. Mesh : 材质

        public Mesh mesh;
        private Material mat;
        // Use this for initialization
        void Start () {
            //GetComponent<MeshFilter>().sharedMesh = mesh;
            //Debug.Log(GetComponent<MeshFilter>().mesh == mesh);
            mat = GetComponent<MeshRenderer>().material;      // 获取材质       
        }        
        // Update is called once per frame
        void Update () {
            mat.color = Color.Lerp(mat.color, Color.red, Time.deltaTime); // 更新颜色
        }