83 lines
2.3 KiB
TypeScript
83 lines
2.3 KiB
TypeScript
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// assets/scripts/Preview.ts
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import { _decorator, Component, Node, Prefab, instantiate, Vec3 } from "cc";
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import { BallPhysics } from "./BallPhysics";
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const { ccclass, property } = _decorator;
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@ccclass("Preview")
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export class Preview extends Component {
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@property(Prefab) pointPrefab: Prefab = null!;
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@property(Node) goal: Node = null!;
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@property({ tooltip: "轨迹点数量" }) maxPoints = 30;
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@property({ tooltip: "步长时间（秒）" }) timeStep = 0.05;
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@property(BallPhysics) ballPhys: BallPhysics = null!;
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private points: Node[] = [];
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clear() {
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for (const p of this.points) p.destroy();
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this.points.length = 0;
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}
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/** 显示预测轨迹 */
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showTrajectory(startPos: Vec3, dir: Vec3, speed: number, spin: Vec3) {
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this.clear();
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if (!this.pointPrefab || !this.ballPhys) return;
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const goalZ = this.goal?.worldPosition?.z;
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// 初始状态
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let pos = startPos.clone();
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let v = dir.clone().multiplyScalar(speed);
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let w = spin.clone(); // 自旋
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// 迭代预测
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// let age = 0;
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for (let i = 0; i < this.maxPoints; i++) {
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// age += this.timeStep;
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// 保存点
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const p = instantiate(this.pointPrefab);
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p.setWorldPosition(pos);
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p.setParent(this.node);
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this.points.push(p);
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// === 模拟 BallPhysics.update(dt) ===
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// const dt = this.timeStep;
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const dt = this.timeStep * 0.5;
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// 空气阻力
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const speedNow = v.length();
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if (speedNow > 0.01) {
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const drag = v.clone().multiplyScalar(-this.ballPhys.dragK * speedNow);
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v.add(drag.multiplyScalar(dt));
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}
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// 马格努斯效应：F = k * (ω × v)
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if (w.lengthSqr() > 0.0001 && v.lengthSqr() > 0.0001) {
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// const tFactor = 1.0 / (1.0 + age * 2.0); // age 是飞行时间，越久衰减越快
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// const magnus = w
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// .clone()
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// .cross(v)
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// .multiplyScalar(this.ballPhys.magnusK * tFactor);
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// v.add(magnus.multiplyScalar(dt));
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const magnus = w.clone().cross(v).multiplyScalar(this.ballPhys.magnusK);
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v.add(magnus.multiplyScalar(dt));
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}
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// 重力
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v.y += -9.8 * dt;
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// 移动
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pos = pos.add(v.clone().multiplyScalar(dt));
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if (
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(startPos.z > goalZ && pos.z <= goalZ) ||
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(startPos.z < goalZ && pos.z >= goalZ)
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) {
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break;
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}
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}
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}
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}
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