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using System.Collections.Generic;
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using System.Linq;
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using UnityEngine;
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public class GearFollower : MonoBehaviour
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{
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[Header("参数")]
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public SpriteRenderer targetSpriteRenderer; // 目标图片
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public float snapDistance = 0.3f; // 距离边缘多少时吸附
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public float detachDistance = 1.0f; // 超过多少距离脱离牵引
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public float tractionSpeed = 2f; // 牵引时沿边缘移动速度
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public float rotationSpeed = 360f; // 齿轮旋转速度（度/秒）
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public float smoothTime = 0.1f; // 平滑过渡时间
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public float edgeSmoothTime = 0.05f; // 边缘移动平滑时间
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public float edgeScaleFactor = 1.1f; // 边缘点采样放大倍数
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public Color normalColor = Color.white; // 正常状态颜色
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public Color tractionColor = Color.yellow; // 牵引状态颜色
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private List<Vector2> edgePoints; // 边缘路径点
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private int currentEdgeIndex = 0; // 当前吸附边缘点索引
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private SpriteRenderer gearSpriteRenderer; // 齿轮的SpriteRenderer
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private Vector2 currentVelocity; // 用于平滑移动
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private float currentRotationVelocity; // 用于平滑旋转
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private enum State { Follow, Traction }
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private State currentState = State.Follow;
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private Camera mainCamera;
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private Vector2 targetEdgePosition; // 目标边缘位置
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private float currentEdgeProgress; // 当前边缘移动进度
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void Start()
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{
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mainCamera = Camera.main;
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gearSpriteRenderer = GetComponent<SpriteRenderer>();
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if (gearSpriteRenderer == null)
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{
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Debug.LogError("齿轮对象缺少SpriteRenderer组件");
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}
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LoadEdgePointsFromSprite();
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}
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void Update()
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{
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Vector2 mouseWorldPos = mainCamera.ScreenToWorldPoint(Input.mousePosition);
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switch (currentState)
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{
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case State.Follow:
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UpdateFollowState(mouseWorldPos);
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break;
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case State.Traction:
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UpdateTractionState(mouseWorldPos);
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break;
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}
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// 更新齿轮旋转
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UpdateGearRotation();
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// 更新视觉反馈
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UpdateVisualFeedback();
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}
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// 更新齿轮旋转
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private void UpdateGearRotation()
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{
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if (currentState == State.Traction && Input.GetMouseButton(0))
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{
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// 在牵引状态下按住左键时旋转
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transform.Rotate(0, 0, rotationSpeed * Time.deltaTime);
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}
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}
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// 更新视觉反馈
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private void UpdateVisualFeedback()
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{
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if (gearSpriteRenderer != null)
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{
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gearSpriteRenderer.color = currentState == State.Traction ? tractionColor : normalColor;
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}
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}
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// 从Sprite的PhysicsShape获取边缘点，构成闭环路径
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private void LoadEdgePointsFromSprite()
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{
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edgePoints = new List<Vector2>();
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if (targetSpriteRenderer == null)
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{
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Debug.LogError("targetSpriteRenderer 为空");
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return;
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}
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List<Vector2> shapePoints = new List<Vector2>();
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targetSpriteRenderer.sprite.GetPhysicsShape(0, shapePoints);
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if (shapePoints.Count == 0)
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{
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Debug.LogError("目标Sprite没有物理形状点");
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return;
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}
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// 计算形状的中心点
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Vector2 center = Vector2.zero;
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foreach (Vector2 point in shapePoints)
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{
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center += point;
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}
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center /= shapePoints.Count;
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// 转换为世界坐标并应用放大
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edgePoints = shapePoints
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.Select(p => {
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// 计算从中心点到当前点的向量
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Vector2 dirFromCenter = p - center;
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// 应用放大
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Vector2 scaledPoint = center + dirFromCenter * edgeScaleFactor;
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// 转换为世界坐标
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return (Vector2)targetSpriteRenderer.transform.TransformPoint(scaledPoint);
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})
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.ToList();
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// 假设形状是闭合的，确保首尾连通
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if (edgePoints[0] != edgePoints[edgePoints.Count - 1])
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{
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edgePoints.Add(edgePoints[0]);
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}
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}
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// 跟随模式逻辑
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private void UpdateFollowState(Vector2 mousePos)
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{
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// 使用平滑移动
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transform.position = Vector2.SmoothDamp(transform.position, mousePos, ref currentVelocity, smoothTime);
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// 检测距离最近边缘点是否在snapDistance内，进入牵引
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int nearestIndex = FindNearestEdgePointIndex(mousePos, out float dist);
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if (dist < snapDistance)
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{
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currentEdgeIndex = nearestIndex;
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currentState = State.Traction;
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// 切换到牵引状态时，调整渲染顺序
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if (gearSpriteRenderer != null)
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{
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gearSpriteRenderer.sortingOrder = 1;
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}
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}
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}
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// 牵引模式逻辑
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private void UpdateTractionState(Vector2 mousePos)
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{
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Vector2 gearPos = (Vector2)transform.position;
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// 计算鼠标和齿轮距离，超过detachDistance则脱离牵引
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if (Vector2.Distance(mousePos, gearPos) > detachDistance)
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{
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currentState = State.Follow;
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// 切换回跟随状态时，调整渲染顺序
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if (gearSpriteRenderer != null)
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{
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gearSpriteRenderer.sortingOrder = 5;
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}
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return;
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}
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// 判断是否按住左键
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if (!Input.GetMouseButton(0))
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{
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// 未按键，齿轮固定在边缘点
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transform.position = Vector2.SmoothDamp(transform.position, edgePoints[currentEdgeIndex], ref currentVelocity, smoothTime);
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}
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else
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{
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// 按住左键，齿轮沿边缘点链移动
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MoveAlongEdge(mousePos);
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}
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}
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// 沿边缘移动的逻辑
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private void MoveAlongEdge(Vector2 mousePos)
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{
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// 找到当前边缘点前后点索引，注意闭环处理
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int prevIndex = (currentEdgeIndex - 1 + edgePoints.Count) % edgePoints.Count;
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int nextIndex = (currentEdgeIndex + 1) % edgePoints.Count;
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Vector2 prevPoint = edgePoints[prevIndex];
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Vector2 currPoint = edgePoints[currentEdgeIndex];
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Vector2 nextPoint = edgePoints[nextIndex];
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// 计算向前和向后移动方向
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Vector2 dirToPrev = (prevPoint - currPoint).normalized;
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Vector2 dirToNext = (nextPoint - currPoint).normalized;
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// 计算鼠标到当前点的向量
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Vector2 mouseToCurrent = mousePos - currPoint;
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// 计算鼠标在前后方向上的投影
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float projToPrev = Vector2.Dot(mouseToCurrent, dirToPrev);
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float projToNext = Vector2.Dot(mouseToCurrent, dirToNext);
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// 根据投影决定移动方向
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Vector2 targetDir;
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if (Mathf.Abs(projToPrev) > Mathf.Abs(projToNext))
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{
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targetDir = dirToPrev;
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currentEdgeIndex = prevIndex;
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targetEdgePosition = prevPoint;
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}
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else
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{
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targetDir = dirToNext;
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currentEdgeIndex = nextIndex;
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targetEdgePosition = nextPoint;
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}
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// 计算目标位置（在边缘上）
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Vector2 currentPos = (Vector2)transform.position;
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Vector2 targetPos = Vector2.Lerp(currPoint, targetEdgePosition, currentEdgeProgress);
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// 使用平滑移动
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transform.position = Vector2.SmoothDamp(currentPos, targetPos, ref currentVelocity, edgeSmoothTime);
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// 更新边缘移动进度
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float moveDistance = tractionSpeed * Time.deltaTime;
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float totalDistance = Vector2.Distance(currPoint, targetEdgePosition);
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currentEdgeProgress += moveDistance / totalDistance;
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// 如果到达目标点，重置进度
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if (currentEdgeProgress >= 1f)
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{
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currentEdgeProgress = 0f;
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}
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}
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// 找到距离pos最近的边缘点索引和距离
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private int FindNearestEdgePointIndex(Vector2 pos, out float minDist)
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{
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int nearestIndex = 0;
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minDist = float.MaxValue;
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for (int i = 0; i < edgePoints.Count; i++)
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{
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float dist = Vector2.Distance(pos, edgePoints[i]);
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if (dist < minDist)
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{
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minDist = dist;
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nearestIndex = i;
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}
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}
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return nearestIndex;
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}
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}
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@@ -0,0 +1,11 @@
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fileFormatVersion: 2
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guid: 07505bc4dd78e1e4c87141a1d061dd10
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MonoImporter:
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externalObjects: {}
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serializedVersion: 2
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defaultReferences: []
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executionOrder: 0
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icon: {instanceID: 0}
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userData:
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assetBundleName:
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assetBundleVariant:
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