RTS风格相机控制

屏幕空间 → 相机局部空间 → 世界空间

输入来自：

• 鼠标 delta（PC）
• 触摸 delta（Mobile）

转换流程：

屏幕拖拽↓
相机 right / forward（局部轴）↓（投影到XZ平面）
世界空间移动

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🧩 完整实现代码

using UnityEngine;public class CameraController : MonoBehaviour
{public Transform cam;                 // 控制的相机public float moveSpeed = 0.1f;        // 平移灵敏度（屏幕→世界转换系数）public float zoomSpeed = 5f;          // 缩放速度public float minZoom = 100f;          // 最小高度public float maxZoom = 150f;          // 最大高度// PC 鼠标拖拽记录private Vector3 lastMousePos;// Mobile 单指拖拽记录private Vector2 lastTouchPos;// Mobile 双指缩放记录private float lastTouchDistance;void Update(){// =========================// PC端输入（鼠标）// =========================
#if UNITY_EDITOR || UNITY_STANDALONEHandlePC();
#endif// =========================// Mobile端输入（触摸）// =========================
#if UNITY_ANDROID || UNITY_IOSHandleMobile();
#endif}// =========================// PC 控制逻辑// =========================void HandlePC(){// ---------- 鼠标右键按下：记录起点 ----------if (Input.GetMouseButtonDown(1))lastMousePos = Input.mousePosition;// ---------- 鼠标右键拖拽 ----------if (Input.GetMouseButton(1)){// 计算屏幕空间位移（像素）Vector3 delta = Input.mousePosition - lastMousePos;lastMousePos = Input.mousePosition;ApplyPan(delta);}// ---------- 鼠标滚轮缩放 ----------float scroll = Input.GetAxis("Mouse ScrollWheel");if (scroll != 0){float newY = cam.position.y - scroll * zoomSpeed;// 限制相机高度范围newY = Mathf.Clamp(newY, minZoom, maxZoom);cam.position = new Vector3(cam.position.x, newY, cam.position.z);}}// =========================// Mobile 控制逻辑// =========================void HandleMobile(){// ---------- 单指拖拽（平移） ----------if (Input.touchCount == 1){Touch t = Input.GetTouch(0);// 记录起始触摸点if (t.phase == TouchPhase.Began)lastTouchPos = t.position;// 拖动中if (t.phase == TouchPhase.Moved){Vector2 delta = t.position - lastTouchPos;lastTouchPos = t.position;ApplyPan(delta);}}// ---------- 双指缩放（缩放相机高度） ----------else if (Input.touchCount == 2){Touch t0 = Input.GetTouch(0);Touch t1 = Input.GetTouch(1);// 当前两指距离float curDist = Vector2.Distance(t0.position, t1.position);// 任一手指刚触发时初始化，避免跳变if (t0.phase == TouchPhase.Began || t1.phase == TouchPhase.Began){lastTouchDistance = curDist;return;}// 距离变化量float delta = curDist - lastTouchDistance;lastTouchDistance = curDist;// 根据距离变化调整高度float newY = cam.position.y - delta * 0.02f;newY = Mathf.Clamp(newY, minZoom, maxZoom);cam.position = new Vector3(cam.position.x, newY, cam.position.z);}}// =========================// 🎯 核心平移逻辑（统一PC/Mobile）// =========================void ApplyPan(Vector2 delta){// -----------------------------------------// 1️⃣ 获取相机局部坐标轴（世界空间表示）// -----------------------------------------// 相机右方向（局部X轴）Vector3 right = cam.right;// 投影到XZ平面（避免上下漂移）right.y = 0;right.Normalize();// 相机前方向（局部Z轴）Vector3 forward = cam.forward;// 同样投影到XZ平面forward.y = 0;forward.Normalize();// -----------------------------------------// 2️⃣ 屏幕空间 → 世界空间映射// -----------------------------------------// delta.x → 左右拖动// delta.y → 上下拖动// 注意负号：实现“拖动世界”的感觉（RTS常见）Vector3 move =(-delta.x * right + -delta.y * forward) * moveSpeed;// -----------------------------------------// 3️⃣ 应用到相机位置// -----------------------------------------cam.position += move;}
}