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
代码语言：javascript复制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;
}
}
