unity3d模拟Scene视图camera控制

比眉伴天荒 2022-11-29 01:00 302阅读 0赞

中键滚动，camera前进后退  
右键拖动，camera原地旋转  
中键拖动，camera上下左右平移

using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    
    public class CameraCtrl : MonoBehaviour
    { 
        Transform m_trans;
        public float m_zoomSpeed = 1.0f;
        public float m_dragSpeed = 10.0f;
        public float m_rotateSpeed = 5.0f;
        Vector3 m_lastMousePos;
    
        bool m_isDraging = false;
        // Start is called before the first frame update
        void Start()
        { 
            m_trans = this.transform;
    
        }
    
        private void LateUpdate()
        { 
            Zoom();
            Rotate();
            Drag();
        }
    
        void Zoom()
        { 
            Vector3 pos = m_trans.position;
            if (Input.GetAxis("Mouse ScrollWheel") < 0)
            { 
                pos -= m_trans.forward * m_zoomSpeed;
            }
    
            if (Input.GetAxis("Mouse ScrollWheel") > 0)
            { 
                pos += m_trans.forward * m_zoomSpeed;
            }
    
            m_trans.position = pos;
    
        }
    
        void Rotate()
        { 
            Vector3 angle = m_trans.eulerAngles;
            if (Input.GetMouseButton(1))
            { 
                float x = Input.GetAxis("Mouse X");
                float y = Input.GetAxis("Mouse Y");
                angle.x -= y* m_rotateSpeed;
                angle.y += x* m_rotateSpeed;
    
            }
    
            Quaternion rotation = Quaternion.Euler(angle);
            m_trans.rotation = rotation;
    
        }
    
        private void Drag()
        { 
            if (Input.GetMouseButton(2))
            { 
                if (m_isDraging == false)
                { 
                    m_isDraging = true;
                    m_lastMousePos = Input.mousePosition;
                }
                else { 
                    Vector3 newMousePos = Input.mousePosition;
                    Debug.Log(newMousePos);
                    Vector3 delta = newMousePos - m_lastMousePos;
                    m_trans.position += CalcDragLength(gameObject.GetComponent<Camera>(), delta) * m_dragSpeed;
                    m_lastMousePos = newMousePos;
                }
            }
    
            if (Input.GetMouseButtonUp(2))
            { 
                m_isDraging = false;
            }
        }
    
        private Vector3 CalcDragLength(Camera camera, Vector2 mouseDelta)
        { 
            float rectHeight = -1;
            float rectWidth = -1;
            if (camera.orthographic)
            { 
                rectHeight = 2 * camera.orthographicSize;
                //rectWidth = rectHeight / camera.aspect;
            }
            else
            { 
                rectHeight = 2  * Mathf.Tan(camera.fieldOfView * 0.5f * Mathf.Deg2Rad);
            }
            rectWidth = Screen.width * rectHeight / Screen.height;
            Vector3 moveDir = -rectWidth / Screen.width * mouseDelta.x * camera.transform.right - rectHeight / Screen.height * mouseDelta.y * camera.transform.up;
    
            return moveDir;
        }
    
    }