feat: 新增物理弹球实验室及配套功能
1. 新增物理弹球游戏全套代码，包含物理引擎、规则、渲染、游戏逻辑、存档、音效、UI 2. 新增物理弹球相关调试与单元测试脚本 3. 优化私有剪贴上传功能：增加200MB上传限制与错误提示 4. 修复复古弹球桌的光滑面防粘附与休眠逻辑
This commit is contained in:
yangxiangyuan
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/* ============================================================
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* pb_physics.js · 物理弹球 Web 复刻版 · 刚体引擎
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* 纯函数区：不依赖 DOM / 渲染，可被
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* dev_test_scripts/unit/test_physics_balls_physics.js 直接加载做单元测试。
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*
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* 设计：
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* - 刚体两类：circle / 凸多边形 poly（verts 为局部坐标，逆时针）
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* - 碰撞检测：circle-circle / circle-poly / poly-poly（SAT 分离轴 +
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* 顶点穿透流形，最多 2 接触点，足够砖块堆叠稳定）
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* - 求解：序贯冲量 + 累积法向冲量钳制（≥0）+ 库仑摩擦累积钳制 +
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* 恢复系数 bias（低速阈值内 e=0 防抖）+ Baumgarte 位置校正
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* - 休眠：低速稳定持续一段时间 → sleeping（视同静态）；
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* 被高速接触/外力唤醒。砖块堆叠靠休眠防抖、省性能
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* - 事件：stepWorld 返回 events（新接触对且接近速度超阈值），
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* 供游戏层做「击中砖块 +分/扣血」与音效
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* 单位：px、s。y 向下。
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* ============================================================ */
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var PBPhysics = (function () {
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'use strict';
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var UID = 1;
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// ---------- 刚体工厂 ----------
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function baseBody(o) {
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var b = {
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id: UID++,
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shape: o.shape,
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x: o.x || 0, y: o.y || 0, angle: o.angle || 0,
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vx: 0, vy: 0, omega: 0,
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fx: 0, fy: 0, // 累积冲量引起的速度变化由求解器直接改 vx/vy
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r: o.r || 0,
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verts: o.verts || null, // 局部坐标
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friction: o.friction != null ? o.friction : 0.2,
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restitution: o.restitution || 0,
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isStatic: !!o.isStatic,
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sleeping: false, sleepTimer: 0,
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tag: o.tag || '', // 'ball' | 'block' | 'item' | 'wall'
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data: o.data || null,
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aabb: { x0: 0, y0: 0, x1: 0, y1: 0 }
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};
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if (b.isStatic) { b.m = 0; b.invM = 0; b.I = 0; b.invI = 0; }
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return b;
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}
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function makeCircle(o) {
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var b = baseBody(o);
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b.shape = 'circle';
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var m = o.r * o.r * 0.06;
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if (!b.isStatic) {
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b.m = m; b.invM = 1 / m;
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b.I = 0.5 * m * o.r * o.r; b.invI = 1 / b.I;
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}
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return b;
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}
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function polyAreaInertia(verts) {
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var area = 0, I = 0, i;
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for (i = 0; i < verts.length; i++) {
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var p1 = verts[i], p2 = verts[(i + 1) % verts.length];
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var cross = p1.x * p2.y - p2.x * p1.y;
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area += cross / 2;
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I += cross / 12 * (p1.x * p1.x + p1.x * p2.x + p2.x * p2.x + p1.y * p1.y + p1.y * p2.y + p2.y * p2.y);
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}
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return { area: Math.abs(area), I: Math.abs(I) };
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}
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function makePoly(o) {
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var b = baseBody(o);
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b.shape = 'poly';
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var ai = polyAreaInertia(o.verts);
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if (!b.isStatic) {
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var m = Math.max(0.5, ai.area * 0.05) * (o.massScale || 1);
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b.m = m; b.invM = 1 / m;
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b.I = Math.max(1, ai.I * 0.05 * (o.massScale || 1)); b.invI = 1 / b.I;
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}
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return b;
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}
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// ---------- 几何工具 ----------
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function worldVerts(b) {
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var c = Math.cos(b.angle), s = Math.sin(b.angle);
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var out = [];
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for (var i = 0; i < b.verts.length; i++) {
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var v = b.verts[i];
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out.push({ x: b.x + v.x * c - v.y * s, y: b.y + v.x * s + v.y * c });
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}
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return out;
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}
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function updateAabb(b) {
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var a = b.aabb;
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if (b.shape === 'circle') {
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a.x0 = b.x - b.r; a.y0 = b.y - b.r; a.x1 = b.x + b.r; a.y1 = b.y + b.r;
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} else {
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var vs = worldVerts(b);
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var x0 = 1e9, y0 = 1e9, x1 = -1e9, y1 = -1e9;
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for (var i = 0; i < vs.length; i++) {
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if (vs[i].x < x0) x0 = vs[i].x;
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if (vs[i].y < y0) y0 = vs[i].y;
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if (vs[i].x > x1) x1 = vs[i].x;
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if (vs[i].y > y1) y1 = vs[i].y;
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}
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a.x0 = x0; a.y0 = y0; a.x1 = x1; a.y1 = y1;
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}
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}
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function aabbOverlap(a, b) {
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return a.aabb.x0 <= b.aabb.x1 && a.aabb.x1 >= b.aabb.x0 &&
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a.aabb.y0 <= b.aabb.y1 && a.aabb.y1 >= b.aabb.y0;
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}
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function pointInPoly(px, py, vs) {
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var sign = 0;
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for (var i = 0; i < vs.length; i++) {
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var a = vs[i], b = vs[(i + 1) % vs.length];
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var cr = (b.x - a.x) * (py - a.y) - (b.y - a.y) * (px - a.x);
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if (cr !== 0) {
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var sg = cr > 0 ? 1 : -1;
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if (sign === 0) sign = sg;
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else if (sg !== sign) return false;
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}
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}
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return true;
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}
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// ---------- 碰撞检测：返回流形 {a,b,nx,ny,points:[{x,y,pen,bias}] }，法线 a→b ----------
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function collideCircleCircle(a, b) {
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var dx = b.x - a.x, dy = b.y - a.y;
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var R = a.r + b.r;
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var d2 = dx * dx + dy * dy;
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if (d2 >= R * R) return null;
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var d = Math.sqrt(d2) || 1e-9;
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var nx = dx / d, ny = dy / d;
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return {
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a: a, b: b, nx: nx, ny: ny,
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points: [{ x: a.x + nx * a.r, y: a.y + ny * a.r, pen: R - d }]
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};
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}
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function closestOnPoly(px, py, vs) {
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var best = null, bestD2 = 1e18;
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for (var i = 0; i < vs.length; i++) {
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var a = vs[i], b = vs[(i + 1) % vs.length];
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var dx = b.x - a.x, dy = b.y - a.y;
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var L2 = dx * dx + dy * dy || 1e-9;
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var t = ((px - a.x) * dx + (py - a.y) * dy) / L2;
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t = t < 0 ? 0 : (t > 1 ? 1 : t);
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var cx = a.x + dx * t, cy = a.y + dy * t;
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var d2 = (px - cx) * (px - cx) + (py - cy) * (py - cy);
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if (d2 < bestD2) { bestD2 = d2; best = { x: cx, y: cy }; }
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}
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return best;
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}
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function collideCirclePoly(circle, poly, swap) {
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var vs = worldVerts(poly);
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var inside = pointInPoly(circle.x, circle.y, vs);
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var c = closestOnPoly(circle.x, circle.y, vs);
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var dx = circle.x - c.x, dy = circle.y - c.y;
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var d2 = dx * dx + dy * dy;
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var d = Math.sqrt(d2) || 1e-9;
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var pnx, pny, pen;
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if (inside) {
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// 圆心在多边形内：推出方向 = 圆心指向最近边界点
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pnx = -dx / d; pny = -dy / d; pen = circle.r + d;
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} else {
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if (d >= circle.r) return null;
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// 多边形→圆 = 最近点指向圆心
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pnx = dx / d; pny = dy / d; pen = circle.r - d;
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}
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// 法线约定 a→b；swap=true 表示 a=circle,b=poly
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var m = { points: [{ x: c.x, y: c.y, pen: pen }] };
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if (!swap) { m.a = poly; m.b = circle; m.nx = pnx; m.ny = pny; }
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else { m.a = circle; m.b = poly; m.nx = -pnx; m.ny = -pny; }
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return m;
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}
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function centroid(vs) {
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var cx = 0, cy = 0;
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for (var i = 0; i < vs.length; i++) { cx += vs[i].x; cy += vs[i].y; }
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return { x: cx / vs.length, y: cy / vs.length };
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}
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// 第 i 条边的单位外法线（与顶点绕序无关）
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function edgeOutNormal(vs, i) {
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var a1 = vs[i], a2 = vs[(i + 1) % vs.length];
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var nx = -(a2.y - a1.y), ny = a2.x - a1.x;
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var L = Math.sqrt(nx * nx + ny * ny) || 1e-9;
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nx /= L; ny /= L;
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var c = centroid(vs);
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var mx = (a1.x + a2.x) / 2, my = (a1.y + a2.y) / 2;
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if ((mx - c.x) * nx + (my - c.y) * ny < 0) { nx = -nx; ny = -ny; }
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return { x: nx, y: ny };
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}
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// SAT 最大分离轴：返回 {sep, i}（A 的第 i 条边外法线方向上 B 相对 A 的分离量；sep>0 已分离）
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function maxSeparation(va, vb) {
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var best = -1e18, bi = 0;
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for (var i = 0; i < va.length; i++) {
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var n = edgeOutNormal(va, i);
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var a1 = va[i];
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var minProj = 1e18;
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for (var j = 0; j < vb.length; j++) {
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var pr = (vb[j].x - a1.x) * n.x + (vb[j].y - a1.y) * n.y;
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if (pr < minProj) minProj = pr;
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}
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if (minProj > best) { best = minProj; bi = i; }
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}
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return { sep: best, i: bi };
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}
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function collidePolyPoly(a, b) {
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var va = worldVerts(a), vb = worldVerts(b);
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var sa = maxSeparation(va, vb);
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if (sa.sep > 0) return null;
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var sb = maxSeparation(vb, va);
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if (sb.sep > 0) return null;
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// 流形法线约定 a→b（A→B）
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var nx, ny, refPt, refA, refB;
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if (sb.sep > sa.sep + 0.01) {
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var nB = edgeOutNormal(vb, sb.i); // B 外法线 = B→A
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nx = -nB.x; ny = -nB.y; // 取反 = A→B
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refPt = vb[sb.i];
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refA = vb[sb.i]; refB = vb[(sb.i + 1) % vb.length];
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} else {
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var nA = edgeOutNormal(va, sa.i); // A 外法线 = A→B
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nx = nA.x; ny = nA.y;
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refPt = va[sa.i];
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refA = va[sa.i]; refB = va[(sa.i + 1) % va.length];
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}
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// 顶点穿透流形：收集互相穿透的顶点
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var pts = [];
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var i;
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for (i = 0; i < vb.length; i++) {
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if (pointInPoly(vb[i].x, vb[i].y, va)) {
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// B 顶点穿入 A：在 A→B 法线上投影为负
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pts.push({ x: vb[i].x, y: vb[i].y, pen: Math.max(0.1, -((vb[i].x - refPt.x) * nx + (vb[i].y - refPt.y) * ny)) });
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}
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}
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for (i = 0; i < va.length; i++) {
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if (pointInPoly(va[i].x, va[i].y, vb)) {
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// A 顶点穿入 B：在 A→B 法线上投影为正
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pts.push({ x: va[i].x, y: va[i].y, pen: Math.max(0.1, (va[i].x - refPt.x) * nx + (va[i].y - refPt.y) * ny) });
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}
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}
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if (!pts.length) {
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// 边-边接触：沿参考边生成 2 个接触点（面接触近似，提供抗旋转扭矩，防堆叠倾覆）
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var ex = refB.x - refA.x, ey = refB.y - refA.y;
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var el = Math.sqrt(ex * ex + ey * ey) || 1e-9;
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ex /= el; ey /= el;
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var oc = centroid(sb.sep > sa.sep + 0.01 ? va : vb);
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var tMid = (oc.x - refA.x) * ex + (oc.y - refA.y) * ey;
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var half = Math.min(el * 0.4, 14);
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var pen0 = Math.max(0.1, -Math.max(sa.sep, sb.sep));
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pts.push({ x: refA.x + ex * (tMid - half), y: refA.y + ey * (tMid - half), pen: pen0 });
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pts.push({ x: refA.x + ex * (tMid + half), y: refA.y + ey * (tMid + half), pen: pen0 });
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}
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if (pts.length > 2) pts.length = 2;
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return { a: a, b: b, nx: nx, ny: ny, points: pts };
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}
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function collide(a, b) {
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if (a.shape === 'circle' && b.shape === 'circle') return collideCircleCircle(a, b);
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if (a.shape === 'circle' && b.shape === 'poly') return collideCirclePoly(a, b, true);
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if (a.shape === 'poly' && b.shape === 'circle') return collideCirclePoly(b, a, false);
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return collidePolyPoly(a, b);
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}
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// ---------- 求解 ----------
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function prepareManifold(m, p) {
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// 记录每点初始接近速度，用于恢复系数 bias
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for (var i = 0; i < m.points.length; i++) {
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var cp = m.points[i];
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cp.rax = cp.x - m.a.x; cp.ray = cp.y - m.a.y;
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cp.rbx = cp.x - m.b.x; cp.rby = cp.y - m.b.y;
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var rvx = (m.b.vx - m.b.omega * cp.rby) - (m.a.vx - m.a.omega * cp.ray);
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var rvy = (m.b.vy + m.b.omega * cp.rbx) - (m.a.vy + m.a.omega * cp.rax);
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var vn = rvx * m.nx + rvy * m.ny;
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cp.bias = (-vn > p.restV) ? -p.e * vn : 0;
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cp.accN = 0; cp.accT = 0;
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}
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m.friction = Math.min(m.a.friction, m.b.friction);
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m.rest = p.e;
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}
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function solveManifold(m, p) {
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var a = m.a, b = m.b;
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var nx = m.nx, ny = m.ny;
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var tx = -ny, ty = nx;
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for (var i = 0; i < m.points.length; i++) {
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var cp = m.points[i];
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// ---- 法向 ----
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var rvx = (b.vx - b.omega * cp.rby) - (a.vx - a.omega * cp.ray);
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var rvy = (b.vy + b.omega * cp.rbx) - (a.vy + a.omega * cp.rax);
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var vn = rvx * nx + rvy * ny;
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var raxn = cp.rax * ny - cp.ray * nx;
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var rbxn = cp.rbx * ny - cp.rby * nx;
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var kn = a.invM + b.invM + raxn * raxn * a.invI + rbxn * rbxn * b.invI;
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if (kn > 1e-9) {
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var lambda = (cp.bias - vn) / kn;
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var newAcc = Math.max(cp.accN + lambda, 0);
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lambda = newAcc - cp.accN;
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cp.accN = newAcc;
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var px_ = nx * lambda, py_ = ny * lambda;
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a.vx -= px_ * a.invM; a.vy -= py_ * a.invM;
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a.omega -= a.invI * (cp.rax * py_ - cp.ray * px_);
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b.vx += px_ * b.invM; b.vy += py_ * b.invM;
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b.omega += b.invI * (cp.rbx * py_ - cp.rby * px_);
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}
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// ---- 切向（库仑摩擦，累积钳制） ----
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rvx = (b.vx - b.omega * cp.rby) - (a.vx - a.omega * cp.ray);
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rvy = (b.vy + b.omega * cp.rbx) - (a.vy + a.omega * cp.rax);
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var vt = rvx * tx + rvy * ty;
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var raxt = cp.rax * ty - cp.ray * tx;
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var rbxt = cp.rbx * ty - cp.rby * tx;
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var kt = a.invM + b.invM + raxt * raxt * a.invI + rbxt * rbxt * b.invI;
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if (kt > 1e-9) {
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var jt = -vt / kt;
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var maxF = m.friction * cp.accN;
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var newT = cp.accT + jt;
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if (newT > maxF) newT = maxF; else if (newT < -maxF) newT = -maxF;
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jt = newT - cp.accT;
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cp.accT = newT;
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var fx_ = tx * jt, fy_ = ty * jt;
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a.vx -= fx_ * a.invM; a.vy -= fy_ * a.invM;
|
||||
a.omega -= a.invI * (cp.rax * fy_ - cp.ray * fx_);
|
||||
b.vx += fx_ * b.invM; b.vy += fy_ * b.invM;
|
||||
b.omega += b.invI * (cp.rbx * fy_ - cp.rby * fx_);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function positionCorrection(m, p) {
|
||||
var maxPen = 0;
|
||||
for (var i = 0; i < m.points.length; i++) if (m.points[i].pen > maxPen) maxPen = m.points[i].pen;
|
||||
var corr = Math.max(maxPen - p.slop, 0) * p.correction;
|
||||
if (corr <= 0) return;
|
||||
var tm = m.a.invM + m.b.invM;
|
||||
if (tm <= 1e-9) return;
|
||||
m.a.x -= m.nx * corr * (m.a.invM / tm);
|
||||
m.a.y -= m.ny * corr * (m.a.invM / tm);
|
||||
m.b.x += m.nx * corr * (m.b.invM / tm);
|
||||
m.b.y += m.ny * corr * (m.b.invM / tm);
|
||||
}
|
||||
|
||||
// ---------- 休眠 ----------
|
||||
function updateSleep(b, dt, p) {
|
||||
if (b.isStatic) return;
|
||||
// 弹球永不休眠：必须保持可滚动/可被滞回收检测，防回合软锁
|
||||
if (b.tag === 'ball') return;
|
||||
var sp2 = b.vx * b.vx + b.vy * b.vy;
|
||||
if (sp2 < p.sleepV * p.sleepV && Math.abs(b.omega) < p.sleepW) b.sleepTimer += dt;
|
||||
else b.sleepTimer = 0;
|
||||
if (!b.sleeping && b.sleepTimer > 0.6) {
|
||||
b.sleeping = true;
|
||||
b.vx = 0; b.vy = 0; b.omega = 0;
|
||||
}
|
||||
}
|
||||
|
||||
function wake(b) {
|
||||
if (b && b.sleeping) { b.sleeping = false; b.sleepTimer = 0; }
|
||||
}
|
||||
|
||||
// ---------- 世界推进 ----------
|
||||
// 返回 { manifolds, events }；events = 新接触对强碰撞 [{a,b,speed}]
|
||||
function stepWorld(bodies, p, dt, prevPairs) {
|
||||
var i, j, b;
|
||||
var events = [];
|
||||
var newPairs = {};
|
||||
|
||||
for (i = 0; i < bodies.length; i++) {
|
||||
b = bodies[i];
|
||||
if (b.isStatic || b.sleeping) continue;
|
||||
b.vy += p.g * dt;
|
||||
if (p.airK > 0) { var f = Math.exp(-p.airK * dt); b.vx *= f; b.vy *= f; }
|
||||
if (p.omegaK > 0) b.omega *= Math.exp(-p.omegaK * dt); // 角速度阻尼，防砖块被击飞后永转
|
||||
var sp2 = b.vx * b.vx + b.vy * b.vy;
|
||||
if (sp2 > p.maxV * p.maxV) { var s = p.maxV / Math.sqrt(sp2); b.vx *= s; b.vy *= s; }
|
||||
b.x += b.vx * dt;
|
||||
b.y += b.vy * dt;
|
||||
b.angle += b.omega * dt;
|
||||
}
|
||||
for (i = 0; i < bodies.length; i++) updateAabb(bodies[i]);
|
||||
|
||||
var manifolds = [];
|
||||
for (i = 0; i < bodies.length; i++) {
|
||||
var a = bodies[i];
|
||||
for (j = i + 1; j < bodies.length; j++) {
|
||||
var c = bodies[j];
|
||||
if (a.isStatic && c.isStatic) continue;
|
||||
if (a.sleeping && c.sleeping) continue;
|
||||
if (!aabbOverlap(a, c)) continue;
|
||||
var m = collide(a, c);
|
||||
if (!m) continue;
|
||||
prepareManifold(m, p);
|
||||
|
||||
var key = a.id + '_' + c.id;
|
||||
newPairs[key] = true;
|
||||
// 接近速度（质心）
|
||||
var rvx = c.vx - a.vx, rvy = c.vy - a.vy;
|
||||
var speed = Math.sqrt(rvx * rvx + rvy * rvy);
|
||||
// 唤醒：休眠体被高速接触
|
||||
if (a.sleeping && !c.sleeping && speed > p.wakeV) wake(a);
|
||||
if (c.sleeping && !a.sleeping && speed > p.wakeV) wake(c);
|
||||
// 事件：新接触对 + 足够强的接近速度
|
||||
if (!prevPairs[key] && speed > p.hitV) events.push({ a: a, b: c, speed: speed });
|
||||
manifolds.push(m);
|
||||
}
|
||||
}
|
||||
|
||||
for (var it = 0; it < p.iterations; it++) {
|
||||
for (j = 0; j < manifolds.length; j++) solveManifold(manifolds[j], p);
|
||||
}
|
||||
for (j = 0; j < manifolds.length; j++) positionCorrection(manifolds[j], p);
|
||||
|
||||
for (i = 0; i < bodies.length; i++) {
|
||||
b = bodies[i];
|
||||
if (!b.isStatic && !b.sleeping) updateSleep(b, dt, p);
|
||||
}
|
||||
return { manifolds: manifolds, events: events, pairs: newPairs };
|
||||
}
|
||||
|
||||
// 凸正多边形局部顶点（逆时针）
|
||||
function regularVerts(n, radius, rot0) {
|
||||
var vs = [];
|
||||
for (var i = 0; i < n; i++) {
|
||||
var a = (rot0 || -Math.PI / 2) + i * 2 * Math.PI / n;
|
||||
vs.push({ x: Math.cos(a) * radius, y: Math.sin(a) * radius });
|
||||
}
|
||||
return vs;
|
||||
}
|
||||
|
||||
// 矩形局部顶点
|
||||
function boxVerts(w, h) {
|
||||
return [
|
||||
{ x: -w / 2, y: -h / 2 },
|
||||
{ x: w / 2, y: -h / 2 },
|
||||
{ x: w / 2, y: h / 2 },
|
||||
{ x: -w / 2, y: h / 2 }
|
||||
];
|
||||
}
|
||||
|
||||
return {
|
||||
makeCircle: makeCircle,
|
||||
makePoly: makePoly,
|
||||
worldVerts: worldVerts,
|
||||
collide: collide,
|
||||
stepWorld: stepWorld,
|
||||
wake: wake,
|
||||
regularVerts: regularVerts,
|
||||
boxVerts: boxVerts,
|
||||
pointInPoly: pointInPoly
|
||||
};
|
||||
})();
|
||||
Reference in New Issue
Block a user