Unity 触屏手势控制Camera平移旋转缩放

实现思路

单点触屏，位移增量控制相机平移；

两点触屏，两点位移控制相机前后移动（缩放）；两点中一点不位移控制相机绕点旋转；

实现需要的API

Touch.position触屏点的位置

Touch.deltaPosition触屏点的位移增量

Touch.phase触屏的状态描述触摸的阶段

Input.touchCount触屏点的数量

Input.touches触屏点的数组

代码

using System;
using UnityEngine;public class TouchControlCamera : MonoBehaviour
{public float Speed = 1;//控制速度Transform m_Camera;//相机Vector3 m_transfrom;//记录camera的初始位置Vector3 m_eulerAngles;//记录camera的初始角度Vector3 m_RayHitPoint;//记录射线点Touch m_touchLeft;//记录左边的触屏点Touch m_touchRight;//记录右边的触屏点int m_isforward;//标记摄像机的前后移动方向//用于判断是否放大float m_leng0 = 0;int IsEnlarge(Vector2 P1, Vector2 P2){float leng1 = Vector2.Distance(P1, P2);if (m_leng0 == 0){m_leng0 = leng1;}if (m_leng0 < leng1){//放大手势m_leng0 = leng1;return 1;}else if (m_leng0 > leng1){//缩小手势m_leng0 = leng1;return -1;}else{m_leng0 = leng1;return 0;}}void Start(){m_Camera = this.transform;m_RayHitPoint = Vector3.zero;m_transfrom = m_Camera.position;m_eulerAngles = m_Camera.eulerAngles;}//得到单位向量Vector2 GetDirection(Vector2 vector){vector.Normalize();return vector;}void Update(){if (Input.touchCount <= 0)return;if (Input.touchCount == 1) //单点触碰移动摄像机{if (Input.touches[0].phase == TouchPhase.Began)RayPoint();if (Input.touches[0].phase == TouchPhase.Moved) //手指在屏幕上移动，移动摄像机{Translation(-GetDirection(Input.touches[0].deltaPosition));}}else if (Input.touchCount == 2){//判断左右触屏点if (Input.touches[0].position.x > Input.touches[1].position.x){m_touchLeft = Input.touches[1];m_touchRight = Input.touches[0];}else{m_touchLeft = Input.touches[0];m_touchRight = Input.touches[1];}RayPoint();if (m_touchRight.deltaPosition != Vector2.zero && m_touchLeft.deltaPosition != Vector2.zero){//判断手势伸缩从而进行摄像机前后移动参数缩放效果m_isforward = IsEnlarge(m_touchLeft.position, m_touchRight.position);FrontMove(m_isforward);}else if (m_touchRight.deltaPosition == Vector2.zero && m_touchLeft.deltaPosition != Vector2.zero){RotatePoint(-GetDirection(m_touchLeft.deltaPosition));//左手旋转}else if (m_touchRight.deltaPosition != Vector2.zero && m_touchLeft.deltaPosition == Vector2.zero){RotatePoint(-GetDirection(m_touchRight.deltaPosition));//右手旋转}else{return;}}}Vector3 m_VecOffet = Vector3.zero;/// <summary>/// 水平平移/// </summary>/// <param name="direction"></param>void Translation(Vector2 direction){m_VecOffet = m_RayHitPoint - m_Camera.position;float ftCamerDis = GetDis();if (ftCamerDis == 0){ftCamerDis = 1;}float tranY = direction.y * (float)Math.Sin(Math.Round(m_Camera.localRotation.eulerAngles.x, 2) * Math.PI / 180.0);float tranZ = direction.y * (float)Math.Cos(Math.Round(m_Camera.localRotation.eulerAngles.x, 2) * Math.PI / 180.0);m_Camera.Translate(new Vector3(-direction.x, -tranY, -tranZ) * ftCamerDis * Time.deltaTime * Speed, Space.Self);m_RayHitPoint = m_Camera.position + m_VecOffet;}/// <summary>/// 得到射线碰撞点/// </summary>void RayPoint(){Ray ray;ray = new Ray(m_Camera.position, m_Camera.forward);RaycastHit hit;if (Physics.Raycast(ray, out hit)){m_RayHitPoint = hit.point;}else{m_RayHitPoint = transform.forward * 800 + transform.position;//摄像机前方 800 点                                            }}/// <summary>/// 绕点旋转/// </summary>void RotatePoint(Vector2 rotate){Vector3 eulerAngles = m_Camera.eulerAngles;float eulerAngles_x = eulerAngles.y;float eulerAngles_y = eulerAngles.x;float ftCamerDis = GetDis();eulerAngles_x += (rotate.x) * Time.deltaTime * 60;eulerAngles_y -= (rotate.y) * Time.deltaTime * 60;if (eulerAngles_y > 80){eulerAngles_y = 80;}else if (eulerAngles_y < 1){eulerAngles_y = 1;}Quaternion quaternion = Quaternion.Euler(eulerAngles_y, eulerAngles_x, (float)0);Vector3 vector = ((Vector3)(quaternion * new Vector3((float)0, (float)0, -ftCamerDis))) + m_RayHitPoint;m_Camera.rotation = quaternion;m_Camera.position = vector;}/// <summary>/// 向前移动/// Direction[方向]/// </summary>/// <param name="intDirection">填写正反，1向前移动，2向后移动</param>void FrontMove(int intDirection){float ftCamerDis = GetDis();if (ftCamerDis < 1){ftCamerDis = 1;}m_Camera.Translate(Vector3.forward * ftCamerDis * Time.deltaTime * Speed * intDirection);}float GetDis(){float ftCamerDis = Vector3.Distance(m_Camera.position, m_RayHitPoint);return ftCamerDis;}//相机复位public void Reset(){m_Camera.position = m_transfrom;m_Camera.eulerAngles = m_eulerAngles;}
}

原理参见我的另一篇文章地址

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Unity 触屏手势控制Camera平移旋转缩放

Unity 触屏手势控制Camera平移旋转缩放

实现思路

实现需要的API

代码

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