旋转朝鼠标位置的对象，并触发一些子弹

Question

问题

我有一个游戏物体在我的场景，我想这游戏物体转动，使得它面临着我的鼠标，当我点击它。旋转后，它应该朝着它现在面临的方向移动。但它几乎可行。

例

例如可以说斜边是：4.592912和相邻的是：3.042814，然后我需要MathF.Cos（相邻/斜边）= 0.6625021，现在我采取MathF.Acos（0.6625021） * MathF.Rad2Deg =从现场37.95857

GIF：

代码

float mouseX, mouseY; 
float playerX, playerY; 
float squaredDeltaX, squaredDeltaY; 
float hypotenuse; 

int dirX, dirY; 

float rotation; 

bool mouseClicked = false; 

void Update() { 
    UpdateInputs(); 

    if (mouseClicked) 
    { 
     CalcDistance(playerX,playerY,mouseX,mouseY); 
     SetRotation(squaredDeltaX, squaredDeltaY, hypotenuse); 
    } 

} 

void UpdateInputs() 
{ 
    Vector3 pos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0)); 
    mouseX = pos.x; 
    mouseY = pos.y; 

    playerX = transform.position.x; 
    playerY = transform.position.y; 

    mouseClicked = Input.GetMouseButtonDown(0); 
} 

void CalcDistance(float x, float y, float x1, float y1) 
{ 
    dirX = (x - x1) >= 0 ? 1 : -1; 
    dirY = (y - y1) >= 0 ? 1 : -1; 

    squaredDeltaX = (x - x1) * (x - x1); 
    squaredDeltaY = (y - y1) * (y - y1); 
    hypotenuse = Mathf.Sqrt(squaredDeltaX + squaredDeltaY); 

    print("squaredDelta: " + squaredDeltaX + ", " + squaredDeltaY); 
    print("Hypotenuse: " + hypotenuse); 
    print("delta: " + Mathf.Sqrt(squaredDeltaX)*dirX + ", " + Mathf.Sqrt(squaredDeltaY)*dirY); 
} 

void SetRotation(float opposite, float adjacent, float hypotenuse) 
{ 
    float tempOpposite = Mathf.Sqrt(opposite); 
    float tempAdjacent = Mathf.Sqrt(adjacent); 

    rotation = Mathf.Acos(Mathf.Cos(tempOpposite/hypotenuse)); 
    print("MathF.Cos: " + rotation); 
    rotation *= Mathf.Rad2Deg * dirX; 
    print("MathF.Acos: " + rotation); 
    rotation = dirY != -1 ? rotation + 180 : rotation; 
    print("angle: " + rotation + "*"); 

    transform.eulerAngles = new Vector3(1,1,rotation); 
} 

Answer 1

下面是使用Mathf.Atan，Rigidibody2D和ConstantForce2D鲁棒方法：

using UnityEngine; 

public class NewBehaviourScript : MonoBehaviour 
{ 
    private Camera _camera; 
    private GameObject _find; 

    private void OnEnable() 
    { 
     _find = GameObject.Find("New Sprite"); 
     _camera = Camera.main; 
    } 

    private void Update() 
    { 
     // find the vector between cannon and mouse position 
     var p1 = _camera.ScreenToViewportPoint(Input.mousePosition); 
     var p2 = _camera.WorldToViewportPoint(_find.transform.position); 
     var p3 = p2 - p1; 

     // rotate cannon to mouse position 
     var angle = Mathf.Atan2(p3.y, p3.x) * Mathf.Rad2Deg; 
     _find.transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward); 

     // throw a projectile on mouse down 
     if (Input.GetMouseButtonDown(0)) 
     { 
      var clone = Instantiate(_find); 

      var rb = clone.AddComponent<Rigidbody2D>(); 
      rb.gravityScale = 0; 

      var force = clone.AddComponent<ConstantForce2D>(); 
      force.relativeForce = Vector2.left * 5.0f; 
     } 
    } 
} 

这里的该场景的设置：

（父对象的规模是10）

结果：

注：

你可能会关闭的+/- 90度，在我的例子中，我并没有理会，我刚搬到红小费到适当的地方，我会把它留给你作为练习！

您可以做的另一件事是摧毁不再可见的物体，使用Camera中使用的方法应该很容易。