ball/assets/scripts/BallPhysics.ts

// assets/scripts/BallPhysics.ts
import {
  _decorator,
  Component,
  Node,
  RigidBody,
  Vec3,
  math,
  SphereCollider,
  Contact2DType,
  MeshCollider,
  ICollisionEvent,
  ITriggerEvent,
} from "cc";
const { ccclass, property } = _decorator;

@ccclass("BallPhysics")
export class BallPhysics extends Component {
  @property({ tooltip: "马格努斯系数（越大弧线越明显）" }) magnusK = 0.1;
  @property({ tooltip: "空气阻力" }) dragK = 0.001;
  @property({ tooltip: "风力（m/s^2）" }) windStrength = 0;
  @property({ tooltip: "风向" }) windDir: Vec3 = new Vec3(1, 0, 0);

  @property({ tooltip: "自动重置高度阈值（低于视为无效球）" }) resetY = -2;
  @property(Node) spawnPoint!: Node;

  @property(Node) ball!: Node;

  private rb!: RigidBody;
  private tmpF = new Vec3();
  private v = new Vec3();
  private w = new Vec3();
  private wind = new Vec3();
  private pos = new Vec3();

  // ⚽ 保存 spin（KickInput 设置进来）
  private spin = new Vec3();

  onLoad() {
    this.rb = this.ball.getComponent(RigidBody)!;
    const col = this.ball.getComponent(MeshCollider);
    if (col) {
      console.log(22223333, col);
      col.on("onTriggerEnter", this.onTriggerEnter, this);
      col.on("onTriggerStay", this.onTriggerStay, this);
      col.on("onCollisionEnter", this.onCollisionEnter, this);
    }
    this.wind.set(this.windDir).normalize();
  }

  private onTriggerStay(event: ITriggerEvent) {
    console.log(event.type, event);
  }

  onTriggerEnter(event: ICollisionEvent) {
    console.log("⚽ 触发器进入:", event.otherCollider.node.name);
  }

  onCollisionEnter(event: ICollisionEvent) {
    console.log("⚽ 碰撞进入:", event.otherCollider.node.name);
  }

  init() {
    this.rb = this.node.getComponent(RigidBody)!;
    this.wind.set(this.windDir).normalize();
    this.pos = this.node.worldPosition.clone();
  }

  setWind(direction: Vec3, strength: number) {
    this.wind.set(direction).normalize();
    this.windStrength = strength;
  }

  resetBall() {
    if (!this.spawnPoint) return;
    this.rb.clearState();
    this.node.worldPosition = this.pos; //this.spawnPoint.worldPosition.clone();
    this.rb.setLinearVelocity(new Vec3());
    this.rb.setAngularVelocity(new Vec3());
  }

  /** 设置自旋（由 KickInput 调用） */
  public setSpin(spin: Vec3) {
    this.spin.set(spin);
  }

  /** 发射足球 */
  shootBall(dir: Vec3, speed: number) {
    this.rb.clearState();
    this.rb.setLinearVelocity(dir.clone().multiplyScalar(speed));
    this.rb.setAngularVelocity(this.spin); // 应用横向旋转
  }

  update(dt: number) {
    if (!this.rb) return;

    this.rb.getLinearVelocity(this.v);

    // 1. 空气阻力（与预测保持一致： -k * v * |v|）
    const speed = this.v.length();
    if (speed > 0.01) {
      const drag = this.v.clone().multiplyScalar(-this.dragK * speed);
      this.rb.applyForce(drag);
    }

    // 2. 马格努斯力： F = k * (spin × v)
    if (!this.spin.equals(Vec3.ZERO) && speed > 0.01) {
      const magnus = new Vec3();
      Vec3.cross(magnus, this.spin, this.v);
      magnus.multiplyScalar(this.magnusK);
      this.rb.applyForce(magnus);
    }

    // if (!this.spin.equals(Vec3.ZERO) && speed > 0.01) {
    //   const magnus = new Vec3();
    //   const vNorm = this.v.clone().normalize();
    //   Vec3.cross(magnus, this.spin, vNorm);
    //   magnus.multiplyScalar(this.magnusK * Math.sqrt(speed));
    //   this.rb.applyForce(magnus);
    // }

    // 3. 风
    if (this.windStrength > 0.0001) {
      this.tmpF.set(this.wind).multiplyScalar(this.windStrength);
      this.rb.applyForce(this.tmpF);
    }

    // 4. 掉出场地自动重置
    if (this.node.worldPosition.y < this.resetY && this.spawnPoint) {
      this.resetBall();
    }
  }
}