LearnSpace: full-stack educational whiteboard platform
Node.js/Express backend + vanilla JS frontend. Features: real-time collaborative whiteboard (SSE), multi-page support, LaTeX formulas, shapes/connectors, coordinate systems, number lines, compass, zoom/pan, Catmull-Rom pencil smoothing, ruler/protractor with rotation & resize controls, minimap navigation overlay, auto-measurements, multi-page thumbnails sidebar, PNG export, page templates. Student/teacher workflows: classes, assignments, library, dashboard. Mobile responsive. SQLite (better-sqlite3). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Maxim Dolgolyov
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/**
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* GasSim v2 — Ideal Gas simulation (PV=nRT, Maxwell-Boltzmann distribution)
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* v2: hover inspector, velocity vectors, movable piston, v_mp/v_rms markers.
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*/
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class GasSim {
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constructor(canvas) {
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this.canvas = canvas;
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this.ctx = canvas.getContext('2d');
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this.W = 0;
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this.H = 0;
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this.particles = [];
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this.N = 80;
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this.T = 1.0;
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this._wallImpulse = 0;
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this._pressureSmooth = 0;
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this._raf = null;
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this._updateTick = 0;
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this.onUpdate = null;
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this._loop = this._loop.bind(this);
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// v2
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this._showVectors = false;
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this._pistonFrac = 1.0; // fraction of W — right wall position
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this._hover = null; // hovered particle
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this._pistonDrag = false;
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canvas.addEventListener('mousemove', e => this._onMouseMove(e));
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canvas.addEventListener('mouseleave', () => { this._hover = null; this._pistonDrag = false; });
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canvas.addEventListener('mousedown', e => this._onMouseDown(e));
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canvas.addEventListener('mouseup', () => { this._pistonDrag = false; });
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}
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// ── canvas coordinate helper ────────────────────────────────────────────────
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_cp(e) {
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const r = this.canvas.getBoundingClientRect();
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return {
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x: (e.clientX - r.left) * (this.W / r.width),
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y: (e.clientY - r.top) * (this.H / r.height),
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};
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}
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_onMouseDown(e) {
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const { x } = this._cp(e);
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const px = this.W * this._pistonFrac;
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if (Math.abs(x - px) < 16) this._pistonDrag = true;
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}
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_onMouseMove(e) {
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const { x, y } = this._cp(e);
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if (this._pistonDrag) {
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this.setPiston(x / this.W);
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return;
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}
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// nearest particle within 28px
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let best = null, bestD = 28;
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for (const p of this.particles) {
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const d = Math.hypot(p.x - x, p.y - y);
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if (d < bestD) { bestD = d; best = p; }
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}
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this._hover = best;
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}
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// ── public API ──────────────────────────────────────────────────────────────
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fit() {
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this.W = this.canvas.offsetWidth;
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this.H = this.canvas.offsetHeight;
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this.canvas.width = this.W * devicePixelRatio;
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this.canvas.height = this.H * devicePixelRatio;
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this.ctx.setTransform(devicePixelRatio, 0, 0, devicePixelRatio, 0, 0);
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this.reset();
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}
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reset() {
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this.particles = [];
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const px = this.W * this._pistonFrac;
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for (let i = 0; i < this.N; i++) {
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const a = Math.random() * Math.PI * 2;
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const s = this._maxwellSpeed();
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this.particles.push({
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x: 20 + Math.random() * (px - 40),
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y: 20 + Math.random() * (this.H - 40),
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vx: s * Math.cos(a),
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vy: s * Math.sin(a),
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r: 5,
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});
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}
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this._wallImpulse = 0;
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this._pressureSmooth = 0;
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this._updateTick = 0;
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this._hover = null;
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}
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setN(n) { this.N = n; this.reset(); }
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setT(t) {
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const oldT = this.T;
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if (oldT <= 0) { this.T = t; this.reset(); return; }
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const f = Math.sqrt(t / oldT);
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for (const p of this.particles) { p.vx *= f; p.vy *= f; }
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this.T = t;
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}
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setPiston(frac) {
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this._pistonFrac = Math.max(0.3, Math.min(1.0, frac));
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const px = this.W * this._pistonFrac;
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for (const p of this.particles) {
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if (p.x + p.r > px) { p.x = px - p.r; if (p.vx > 0) p.vx = -p.vx; }
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}
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}
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toggleVectors() { this._showVectors = !this._showVectors; }
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start() { if (!this._raf) this._raf = requestAnimationFrame(this._loop); }
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stop() { cancelAnimationFrame(this._raf); this._raf = null; }
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// ── simulation ──────────────────────────────────────────────────────────────
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_loop() {
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this._step();
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this._step();
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this.draw();
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this._raf = requestAnimationFrame(this._loop);
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}
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_maxwellSpeed() {
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const u1 = Math.max(1e-10, Math.random());
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const sigma = this.T * 60;
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return Math.abs(Math.sqrt(-2 * Math.log(u1)) * Math.cos(Math.PI * 2 * Math.random()) * sigma + sigma);
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}
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_step() {
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const { W, H, particles } = this;
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const px = W * this._pistonFrac;
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for (const p of particles) { p.x += p.vx; p.y += p.vy; }
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for (const p of particles) {
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if (p.x < p.r) {
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p.x = p.r; p.vx = Math.abs(p.vx);
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this._wallImpulse += 2 * Math.abs(p.vx);
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} else if (p.x > px - p.r) {
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p.x = px - p.r; p.vx = -Math.abs(p.vx);
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this._wallImpulse += 2 * Math.abs(p.vx);
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}
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if (p.y < p.r) {
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p.y = p.r; p.vy = Math.abs(p.vy);
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this._wallImpulse += 2 * Math.abs(p.vy);
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} else if (p.y > H - p.r) {
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p.y = H - p.r; p.vy = -Math.abs(p.vy);
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this._wallImpulse += 2 * Math.abs(p.vy);
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}
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}
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// Spatial grid collision
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const cell = 14, cols = Math.ceil(W / cell), rows = Math.ceil(H / cell);
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const grid = new Map();
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const key = (cx, cy) => cy * cols + cx;
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for (let i = 0; i < particles.length; i++) {
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const p = particles[i];
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const k = key(Math.floor(p.x / cell), Math.floor(p.y / cell));
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if (!grid.has(k)) grid.set(k, []);
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grid.get(k).push(i);
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}
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const checked = new Set();
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for (let i = 0; i < particles.length; i++) {
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const p = particles[i];
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const cx = Math.floor(p.x / cell);
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const cy = Math.floor(p.y / cell);
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for (let dy = -1; dy <= 1; dy++) for (let dx = -1; dx <= 1; dx++) {
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const nx = cx + dx, ny = cy + dy;
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if (nx < 0 || ny < 0 || nx >= cols || ny >= rows) continue;
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const cell2 = grid.get(key(nx, ny));
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if (!cell2) continue;
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for (const j of cell2) {
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if (j <= i) continue;
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const pk = i * 100000 + j;
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if (checked.has(pk)) continue;
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checked.add(pk);
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const q = particles[j];
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const ddx = q.x - p.x, ddy = q.y - p.y;
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const d2 = ddx * ddx + ddy * ddy;
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const md = p.r + q.r;
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if (d2 < md * md && d2 > 0) {
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const d = Math.sqrt(d2), nx2 = ddx / d, ny2 = ddy / d;
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const dvn = (q.vx - p.vx) * nx2 + (q.vy - p.vy) * ny2;
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if (dvn >= 0) continue;
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p.vx += dvn * nx2; p.vy += dvn * ny2;
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q.vx -= dvn * nx2; q.vy -= dvn * ny2;
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const ov = (md - d) / 2;
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p.x -= ov * nx2; p.y -= ov * ny2;
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q.x += ov * nx2; q.y += ov * ny2;
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}
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}
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}
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}
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this._pressureSmooth = this._pressureSmooth * 0.92 + this._wallImpulse * 0.08;
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this._wallImpulse = 0;
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if (++this._updateTick % 30 === 0 && this.onUpdate) this.onUpdate(this.info());
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}
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info() {
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const speeds = this.particles.map(p => Math.hypot(p.vx, p.vy));
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const avgSpeed = speeds.length ? speeds.reduce((a, b) => a + b) / speeds.length : 0;
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const pf = this._pistonFrac;
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const P = this._pressureSmooth / (2 * (this.W * pf + this.H)) * 100;
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const V = (this.W * pf * this.H) / 10000;
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return {
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N: this.N, T: this.T,
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P: P.toFixed(1), V: V.toFixed(1), PV: (P * V).toFixed(1),
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avgSpeed: avgSpeed.toFixed(0),
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speedData: this._speedHistogram(speeds),
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};
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}
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_speedHistogram(speeds) {
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const maxSpeed = this.T * 200;
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const numBins = 12;
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const binWidth = maxSpeed / numBins;
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const bins = new Array(numBins).fill(0);
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for (const s of speeds) {
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const idx = Math.floor(s / binWidth);
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if (idx >= 0 && idx < numBins) bins[idx]++;
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}
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return { bins, max: Math.max(...bins, 1), binWidth };
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}
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_mbCurve(v) {
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const sigma = this.T * 60;
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return (v / (sigma * sigma)) * Math.exp(-v * v / (2 * sigma * sigma));
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}
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// ── drawing ─────────────────────────────────────────────────────────────────
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draw() {
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const { ctx, W, H } = this;
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const pistonX = W * this._pistonFrac;
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// Background
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const bg = ctx.createRadialGradient(W / 2, H / 2, 0, W / 2, H / 2, Math.max(W, H) * 0.7);
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bg.addColorStop(0, '#080818'); bg.addColorStop(1, '#030308');
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ctx.fillStyle = bg; ctx.fillRect(0, 0, W, H);
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// Grid
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ctx.strokeStyle = 'rgba(255,255,255,0.03)'; ctx.lineWidth = 1;
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ctx.beginPath();
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for (let x = 0; x <= W; x += 20) { ctx.moveTo(x, 0); ctx.lineTo(x, H); }
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for (let y = 0; y <= H; y += 20) { ctx.moveTo(0, y); ctx.lineTo(W, y); }
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ctx.stroke();
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// Dead zone beyond piston
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if (this._pistonFrac < 0.99) {
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ctx.fillStyle = 'rgba(0,0,0,0.55)';
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ctx.fillRect(pistonX, 0, W - pistonX, H);
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}
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// Pressure wall glow
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const P = parseFloat(this.info().P);
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const wi = Math.min(1, P / 50);
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if (wi > 0) {
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const a = wi * 0.3, gd = 30;
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const glows = [
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[ctx.createLinearGradient(0, 0, gd, 0), 0, 0, gd, H],
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[ctx.createLinearGradient(pistonX, 0, pistonX - gd, 0), pistonX - gd, 0, gd, H],
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[ctx.createLinearGradient(0, 0, 0, gd), 0, 0, W, gd],
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[ctx.createLinearGradient(0, H, 0, H - gd), 0, H - gd, W, gd],
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];
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for (const [g, rx, ry, rw, rh] of glows) {
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g.addColorStop(0, `rgba(155,93,229,${a})`);
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g.addColorStop(1, 'rgba(155,93,229,0)');
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ctx.fillStyle = g; ctx.fillRect(rx, ry, rw, rh);
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}
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}
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// Velocity vectors
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if (this._showVectors) {
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ctx.save();
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for (const p of this.particles) {
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const scale = 3;
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const ex = p.x + p.vx * scale, ey = p.y + p.vy * scale;
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const ang = Math.atan2(p.vy, p.vx);
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ctx.strokeStyle = 'rgba(255,255,255,0.3)'; ctx.lineWidth = 1;
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ctx.beginPath(); ctx.moveTo(p.x, p.y); ctx.lineTo(ex, ey); ctx.stroke();
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const hl = 4;
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ctx.fillStyle = 'rgba(255,255,255,0.3)';
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ctx.beginPath();
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ctx.moveTo(ex, ey);
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ctx.lineTo(ex - hl * Math.cos(ang - 0.4), ey - hl * Math.sin(ang - 0.4));
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ctx.lineTo(ex - hl * Math.cos(ang + 0.4), ey - hl * Math.sin(ang + 0.4));
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ctx.closePath(); ctx.fill();
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}
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ctx.restore();
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}
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// Particles
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for (const p of this.particles) {
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const spd = Math.hypot(p.vx, p.vy);
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const T = this.T;
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const color = spd < T * 40 ? '#4CC9F0' : spd < T * 80 ? '#7BF5A4' : spd < T * 120 ? '#FFD166' : '#EF476F';
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const isH = this._hover === p;
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ctx.save();
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ctx.shadowBlur = isH ? 20 : 8;
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ctx.shadowColor = color;
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ctx.beginPath(); ctx.arc(p.x, p.y, isH ? p.r + 2 : p.r, 0, Math.PI * 2);
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ctx.fillStyle = color; ctx.fill();
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if (isH) { ctx.strokeStyle = 'rgba(255,255,255,0.6)'; ctx.lineWidth = 1.5; ctx.stroke(); }
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ctx.restore();
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}
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// Piston
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this._drawPiston(ctx, pistonX, H);
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// Hover inspector
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if (this._hover) this._drawInspector(ctx, this._hover, W, H);
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// Histogram
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this._drawHistogram(ctx, W, H);
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}
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_drawPiston(ctx, pistonX, H) {
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if (this._pistonFrac >= 0.99) return;
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ctx.save();
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const pw = 8;
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ctx.shadowBlur = 16; ctx.shadowColor = 'rgba(255,209,102,0.5)';
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const g = ctx.createLinearGradient(pistonX - pw, 0, pistonX + pw, 0);
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g.addColorStop(0, 'rgba(255,209,102,0.4)');
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g.addColorStop(0.5, 'rgba(255,209,102,0.9)');
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g.addColorStop(1, 'rgba(255,209,102,0.3)');
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ctx.fillStyle = g; ctx.fillRect(pistonX - pw / 2, 0, pw, H);
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// Handle
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const hh = 44, hw = 18, hx = pistonX - hw / 2, hy = H / 2 - hh / 2;
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ctx.shadowBlur = 0;
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ctx.fillStyle = 'rgba(255,209,102,0.88)';
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ctx.beginPath(); ctx.roundRect(hx, hy, hw, hh, 4); ctx.fill();
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ctx.strokeStyle = 'rgba(0,0,0,0.25)'; ctx.lineWidth = 1.5;
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for (let i = 0; i < 3; i++) {
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const gy = hy + 10 + i * 10;
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ctx.beginPath(); ctx.moveTo(hx + 4, gy); ctx.lineTo(hx + hw - 4, gy); ctx.stroke();
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}
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ctx.fillStyle = 'rgba(255,209,102,0.7)';
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ctx.font = "bold 9px 'Manrope', sans-serif";
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ctx.textAlign = 'center'; ctx.textBaseline = 'middle';
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ctx.fillText('⇌', pistonX, hy - 12);
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ctx.restore();
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}
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_drawInspector(ctx, p, W, H) {
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const spd = Math.hypot(p.vx, p.vy);
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const ang = Math.atan2(p.vy, p.vx) * 180 / Math.PI;
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const ke = 0.5 * spd * spd;
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const T = this.T;
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const clr = spd < T * 40 ? '#4CC9F0' : spd < T * 80 ? '#7BF5A4' : spd < T * 120 ? '#FFD166' : '#EF476F';
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const rows = [
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['|v|', spd.toFixed(1) + ' у.е.'],
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['vx', p.vx.toFixed(1)],
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['vy', p.vy.toFixed(1)],
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['KE', ke.toFixed(0) + ' у.е.'],
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['угол', ang.toFixed(1) + '°'],
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];
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const tw = 132, th = 18 + rows.length * 17 + 8;
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let tx = p.x + 14, ty = p.y - th / 2;
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if (tx + tw > W - 10) tx = p.x - tw - 14;
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ty = Math.max(8, Math.min(H - th - 8, ty));
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ctx.save();
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ctx.fillStyle = 'rgba(6,8,28,0.92)';
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ctx.beginPath(); ctx.roundRect(tx, ty, tw, th, 8); ctx.fill();
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ctx.fillStyle = clr;
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ctx.beginPath(); ctx.roundRect(tx, ty, tw, 3, [8, 8, 0, 0]); ctx.fill();
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ctx.strokeStyle = 'rgba(255,255,255,0.08)'; ctx.lineWidth = 1;
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ctx.beginPath(); ctx.roundRect(tx, ty, tw, th, 8); ctx.stroke();
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ctx.beginPath(); ctx.arc(p.x, p.y, p.r + 5, 0, Math.PI * 2);
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ctx.strokeStyle = 'rgba(255,255,255,0.35)'; ctx.lineWidth = 1; ctx.stroke();
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||||
ctx.font = "11px 'Manrope', monospace"; ctx.textBaseline = 'middle';
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||||
for (let i = 0; i < rows.length; i++) {
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const ry = ty + 18 + i * 17;
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ctx.fillStyle = 'rgba(255,255,255,0.42)'; ctx.textAlign = 'left';
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||||
ctx.fillText(rows[i][0], tx + 10, ry);
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ctx.fillStyle = 'rgba(255,255,255,0.92)'; ctx.textAlign = 'right';
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ctx.fillText(rows[i][1], tx + tw - 10, ry);
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||||
}
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ctx.restore();
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||||
}
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||||
|
||||
_drawHistogram(ctx, W, H) {
|
||||
const speeds = this.particles.map(p => Math.hypot(p.vx, p.vy));
|
||||
const hist = this._speedHistogram(speeds);
|
||||
|
||||
const hw = 204, hh = 102;
|
||||
const hx = W - hw - 12, hy = H - hh - 12;
|
||||
const pad = { l: 8, r: 8, t: 20, b: 18 };
|
||||
const barW = (hw - pad.l - pad.r) / hist.bins.length;
|
||||
const barAreaH = hh - pad.t - pad.b;
|
||||
const maxV = this.T * 200;
|
||||
|
||||
ctx.save();
|
||||
ctx.fillStyle = 'rgba(0,0,0,0.58)';
|
||||
ctx.beginPath(); ctx.roundRect(hx, hy, hw, hh, 6); ctx.fill();
|
||||
|
||||
ctx.fillStyle = 'rgba(255,255,255,0.72)'; ctx.font = '9px sans-serif';
|
||||
ctx.textAlign = 'center';
|
||||
ctx.fillText('Распределение скоростей', hx + hw / 2, hy + 11);
|
||||
|
||||
ctx.fillStyle = 'rgba(255,255,255,0.35)'; ctx.font = '8px sans-serif';
|
||||
ctx.fillText('v (у.е.)', hx + hw / 2, hy + hh - 2);
|
||||
|
||||
// Bars
|
||||
for (let i = 0; i < hist.bins.length; i++) {
|
||||
const ratio = hist.bins[i] / hist.max;
|
||||
const bh = ratio * barAreaH;
|
||||
const bx = hx + pad.l + i * barW;
|
||||
const by = hy + pad.t + barAreaH - bh;
|
||||
ctx.fillStyle = 'rgba(155,93,229,0.75)';
|
||||
ctx.beginPath(); ctx.roundRect(bx + 0.5, by, barW - 1, bh, 2); ctx.fill();
|
||||
}
|
||||
|
||||
// MB theoretical curve
|
||||
ctx.strokeStyle = 'rgba(255,209,102,0.9)'; ctx.lineWidth = 1.5;
|
||||
ctx.setLineDash([3, 3]); ctx.beginPath();
|
||||
let first = true;
|
||||
for (let i = 0; i <= 80; i++) {
|
||||
const v = (i / 80) * maxV;
|
||||
const sc = this._mbCurve(v) * speeds.length * hist.binWidth / hist.max;
|
||||
const cx2 = hx + pad.l + (v / maxV) * (hw - pad.l - pad.r);
|
||||
const cy2 = hy + pad.t + barAreaH - sc * barAreaH;
|
||||
if (first) { ctx.moveTo(cx2, cy2); first = false; }
|
||||
else ctx.lineTo(cx2, cy2);
|
||||
}
|
||||
ctx.stroke(); ctx.setLineDash([]);
|
||||
|
||||
// Characteristic speed lines
|
||||
const sigma = this.T * 60;
|
||||
const v_mp = sigma; // v most probable (mode)
|
||||
const v_rms = sigma * Math.sqrt(2); // v_rms in 2D = sqrt(2) * sigma
|
||||
|
||||
const vline = (v, color, label) => {
|
||||
if (v > maxV) return;
|
||||
const vx2 = hx + pad.l + (v / maxV) * (hw - pad.l - pad.r);
|
||||
ctx.strokeStyle = color; ctx.lineWidth = 1;
|
||||
ctx.setLineDash([2, 3]);
|
||||
ctx.beginPath(); ctx.moveTo(vx2, hy + pad.t); ctx.lineTo(vx2, hy + pad.t + barAreaH); ctx.stroke();
|
||||
ctx.setLineDash([]);
|
||||
ctx.fillStyle = color; ctx.font = '7px sans-serif'; ctx.textAlign = 'center';
|
||||
ctx.fillText(label, vx2, hy + pad.t - 3);
|
||||
};
|
||||
vline(v_mp, 'rgba(76,201,240,0.9)', 'v_mp');
|
||||
vline(v_rms, 'rgba(239,71,111,0.9)', 'v_rms');
|
||||
|
||||
ctx.restore();
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user