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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'use strict';
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/* ══════════════════════════════════════════════════════════════
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IsoprocessSim — PV-diagram for 4 ideal-gas isoprocesses
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n = 1, R = 0.0821 L·atm/mol·K; energies in Joules
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Isothermal PV = const ΔU=0, W=nRT·ln(V2/V1), Q=W
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Isochoric V = const W=0, ΔU=νCvΔT, Q=ΔU
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Isobaric P = const W=PΔV, ΔU=νCvΔT, Q=ΔU+W
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Adiabatic PV^γ = const Q=0, ΔU=-W, W=PΔV/(γ-1)
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══════════════════════════════════════════════════════════════ */
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class IsoprocessSim {
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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; this.H = 0;
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/* physics */
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this.n = 1;
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this.R = 0.0821; // L·atm / mol·K
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this.R_J = 8.314; // J / mol·K
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this.gamma = 1.4; // 7/5 diatomic default
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/* state */
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this.P1 = 3.0; // atm
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this.V1 = 10.0; // L
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this._ratio = 0.5; // 0..1, maps end state position along process
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/* process */
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this.process = 'isothermal';
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/* axis range */
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this.Vmin = 1; this.Vmax = 33;
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this.Pmin = 0.2; this.Pmax = 9.5;
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/* margins */
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this.ML = 52; this.MB = 46; this.MT = 20; this.MR = 18;
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this._drag = null; // 'state1' | 'state2'
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this.onUpdate = null;
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this._bindEvents();
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new ResizeObserver(() => { this.fit(); this.draw(); }).observe(canvas.parentElement);
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}
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/* ── public API ─────────────────────────────── */
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fit() {
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const dpr = window.devicePixelRatio || 1;
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const w = this.canvas.offsetWidth || 600;
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const h = this.canvas.offsetHeight || 400;
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this.canvas.width = w * dpr;
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this.canvas.height = h * dpr;
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this.ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
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this.W = w; this.H = h;
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}
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setProcess(p) { this.process = p; this.draw(); this._emit(); }
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setGamma(g) { this.gamma = +g; this.draw(); this._emit(); }
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setParams({ P1, V1 } = {}) {
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if (P1 !== undefined) this.P1 = Math.max(0.4, Math.min(8, +P1));
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if (V1 !== undefined) this.V1 = Math.max(2, Math.min(28, +V1));
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this.draw(); this._emit();
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}
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setRatio(r) { this._ratio = Math.max(0.01, Math.min(0.99, +r)); this.draw(); this._emit(); }
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/* ── coordinate transforms ─────────────────── */
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_pw() { return this.W - this.ML - this.MR; }
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_ph() { return this.H - this.MT - this.MB; }
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_vx(v) { return this.ML + (v - this.Vmin) / (this.Vmax - this.Vmin) * this._pw(); }
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_py(p) { return this.MT + (1 - (p - this.Pmin) / (this.Pmax - this.Pmin)) * this._ph(); }
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_xv(x) { return this.Vmin + (x - this.ML) / this._pw() * (this.Vmax - this.Vmin); }
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_yp(y) { return this.Pmin + (1 - (y - this.MT) / this._ph()) * (this.Pmax - this.Pmin); }
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/* ── physics ───────────────────────────────── */
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_T(P, V) { return P * V / (this.n * this.R); }
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_state2() {
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const { P1, V1, _ratio, gamma } = this;
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/* ratio in [0..1] → multiplier in [0.2..3.5] for V2/V1 or P2/P1 */
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const mult = 0.2 + _ratio * 3.3;
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const clampV = v => Math.max(this.Vmin + 0.5, Math.min(this.Vmax - 0.5, v));
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const clampP = p => Math.max(this.Pmin + 0.05, Math.min(this.Pmax - 0.1, p));
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switch (this.process) {
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case 'isothermal': {
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const V2 = clampV(V1 * mult);
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return { P2: clampP(P1 * V1 / V2), V2 };
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}
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case 'isochoric': {
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return { P2: clampP(P1 * mult), V2: V1 };
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}
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case 'isobaric': {
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const V2 = clampV(V1 * mult);
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return { P2: P1, V2 };
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}
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case 'adiabatic': {
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const V2 = clampV(V1 * mult);
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return { P2: clampP(P1 * Math.pow(V1 / V2, gamma)), V2 };
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}
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}
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return { P2: P1, V2: V1 };
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}
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info() {
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const { P1, V1, n, R_J, gamma } = this;
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const T1 = this._T(P1, V1);
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const { P2, V2 } = this._state2();
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const T2 = this._T(P2, V2);
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/* internal energy: ΔU = νCvΔT, Cv = R/(γ-1) */
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const Cv_J = R_J / (gamma - 1);
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const dU_J = n * Cv_J * (T2 - T1);
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/* P in Pa = P_atm * 101325, V in m³ = V_L * 0.001 */
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const P1Pa = P1 * 101325, P2Pa = P2 * 101325;
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const V1m3 = V1 * 0.001, V2m3 = V2 * 0.001;
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let W_J = 0, Q_J = 0;
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switch (this.process) {
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case 'isothermal':
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W_J = n * R_J * T1 * Math.log(V2 / V1);
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Q_J = W_J; break;
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case 'isochoric':
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W_J = 0; Q_J = dU_J; break;
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case 'isobaric':
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W_J = P1Pa * (V2m3 - V1m3);
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Q_J = dU_J + W_J; break;
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case 'adiabatic':
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Q_J = 0;
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W_J = -dU_J; break;
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}
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const fmt = x => (x >= 0 ? '+' : '') + Math.round(x);
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return {
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P1: P1.toFixed(2), V1: V1.toFixed(1), T1: Math.round(T1),
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P2: P2.toFixed(2), V2: V2.toFixed(1), T2: Math.round(T2),
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W: fmt(W_J), Q: fmt(Q_J), dU: fmt(Math.round(dU_J)),
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W_raw: W_J, Q_raw: Q_J, dU_raw: dU_J,
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process: this.process,
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};
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}
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_emit() { if (this.onUpdate) this.onUpdate(this.info()); }
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/* ── draw ──────────────────────────────────── */
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draw() {
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const { ctx, W, H } = this;
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if (!W || !H) return;
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ctx.fillStyle = '#0D0D1A';
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ctx.fillRect(0, 0, W, H);
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this._drawGrid(ctx);
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this._drawBgCurves(ctx);
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this._drawActiveCurve(ctx);
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this._drawPoints(ctx);
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this._drawInfoBox(ctx);
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}
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_drawGrid(ctx) {
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const { ML, MT, MR, MB } = this;
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const pw = this._pw(), ph = this._ph();
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/* plot background */
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ctx.fillStyle = 'rgba(255,255,255,0.018)';
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ctx.fillRect(ML, MT, pw, ph);
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/* grid */
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ctx.strokeStyle = 'rgba(255,255,255,0.055)';
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ctx.lineWidth = 1; ctx.setLineDash([]);
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for (let v = 5; v <= 30; v += 5) {
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const x = this._vx(v);
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ctx.beginPath(); ctx.moveTo(x, MT); ctx.lineTo(x, MT + ph); ctx.stroke();
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}
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for (let p = 1; p <= 9; p++) {
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const y = this._py(p);
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ctx.beginPath(); ctx.moveTo(ML, y); ctx.lineTo(ML + pw, y); ctx.stroke();
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}
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/* axes */
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ctx.strokeStyle = 'rgba(255,255,255,0.3)';
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ctx.lineWidth = 1.5;
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ctx.beginPath();
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ctx.moveTo(ML, MT); ctx.lineTo(ML, MT + ph); ctx.lineTo(ML + pw, MT + ph);
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ctx.stroke();
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/* tick labels */
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ctx.font = '11px Manrope, system-ui, sans-serif';
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ctx.fillStyle = 'rgba(255,255,255,0.45)';
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ctx.textAlign = 'right'; ctx.textBaseline = 'middle';
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for (let p = 1; p <= 9; p++) {
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const y = this._py(p);
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if (y < MT + 2 || y > MT + ph - 2) continue;
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ctx.fillText(p, ML - 6, y);
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}
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ctx.textAlign = 'center'; ctx.textBaseline = 'top';
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for (let v = 5; v <= 30; v += 5) {
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const x = this._vx(v);
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ctx.fillText(v, x, MT + ph + 5);
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}
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/* axis titles */
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ctx.fillStyle = 'rgba(255,255,255,0.55)';
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ctx.font = '12px Manrope, system-ui, sans-serif';
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ctx.textAlign = 'center'; ctx.textBaseline = 'middle';
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ctx.fillText('V, л', ML + pw / 2, MT + ph + 32);
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ctx.save();
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ctx.translate(13, MT + ph / 2);
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ctx.rotate(-Math.PI / 2);
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ctx.fillText('P, атм', 0, 0);
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ctx.restore();
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}
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_COLORS = {
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isothermal: '#EF476F',
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isochoric: '#06D6E0',
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isobaric: '#7BF5A4',
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adiabatic: '#FFD166',
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};
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/* draw one process curve through (P1,V1) */
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_curve(ctx, process, alpha, lw, dashed) {
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const { P1, V1, gamma, Vmin, Vmax, Pmin, Pmax } = this;
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ctx.save();
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ctx.globalAlpha = alpha;
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ctx.strokeStyle = this._COLORS[process];
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ctx.lineWidth = lw;
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ctx.setLineDash(dashed ? [5, 4] : []);
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ctx.beginPath();
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if (process === 'isochoric') {
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const x = this._vx(V1);
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ctx.moveTo(x, this._py(Pmax));
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ctx.lineTo(x, this._py(Pmin));
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} else {
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let started = false;
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const steps = 300;
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for (let i = 0; i <= steps; i++) {
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const v = Vmin + (Vmax - Vmin) * i / steps;
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let p;
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if (process === 'isothermal') p = P1 * V1 / v;
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else if (process === 'isobaric') p = P1;
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else p = P1 * Math.pow(V1 / v, gamma); // adiabatic
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if (p < Pmin || p > Pmax + 0.1) { started = false; continue; }
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const x = this._vx(v), y = this._py(Math.min(p, Pmax));
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if (!started) { ctx.moveTo(x, y); started = true; }
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else ctx.lineTo(x, y);
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}
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}
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ctx.stroke();
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ctx.setLineDash([]);
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ctx.restore();
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}
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_drawBgCurves(ctx) {
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for (const p of ['isothermal', 'isochoric', 'isobaric', 'adiabatic']) {
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if (p !== this.process) this._curve(ctx, p, 0.14, 1.2, true);
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}
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/* legend dots */
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const names = { isothermal: 'Изотерма', isochoric: 'Изохора', isobaric: 'Изобара', adiabatic: 'Адиабата' };
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ctx.font = '10px Manrope, system-ui, sans-serif';
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let lx = this.ML + this._pw() - 8, ly = this.MT + 8;
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ctx.textAlign = 'right'; ctx.textBaseline = 'top';
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for (const [proc, label] of Object.entries(names)) {
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const col = this._COLORS[proc];
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const isCur = proc === this.process;
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ctx.globalAlpha = isCur ? 0.85 : 0.3;
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ctx.fillStyle = col;
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ctx.beginPath(); ctx.arc(lx + 5, ly + 4, 4, 0, Math.PI * 2); ctx.fill();
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ctx.fillText(label, lx - 3, ly);
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ly += 16;
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}
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ctx.globalAlpha = 1;
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}
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_drawActiveCurve(ctx) {
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/* full curve dimmed */
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this._curve(ctx, this.process, 0.3, 1.5, false);
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/* highlighted segment state1 → state2 */
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const { P1, V1, gamma } = this;
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const { P2, V2 } = this._state2();
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const color = this._COLORS[this.process];
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ctx.save();
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ctx.strokeStyle = color;
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ctx.lineWidth = 2.8;
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ctx.setLineDash([]);
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const steps = 200;
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const [Vs, Ve] = V2 >= V1 ? [V1, V2] : [V2, V1];
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if (this.process === 'isochoric') {
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const x = this._vx(V1);
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const y1c = this._py(P1), y2c = this._py(P2);
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ctx.beginPath(); ctx.moveTo(x, y1c); ctx.lineTo(x, y2c); ctx.stroke();
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this._arrowHead(ctx, x, y1c, x, y2c, color);
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} else {
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ctx.beginPath();
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let started = false;
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for (let i = 0; i <= steps; i++) {
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const v = Vs + (Ve - Vs) * i / steps;
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let p;
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if (this.process === 'isothermal') p = P1 * V1 / v;
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else if (this.process === 'isobaric') p = P1;
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else p = P1 * Math.pow(V1 / v, gamma);
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const x = this._vx(v), y = this._py(p);
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if (!started) { ctx.moveTo(x, y); started = true; }
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else ctx.lineTo(x, y);
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}
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ctx.stroke();
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/* arrow at ~80% of segment */
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const vArr = Vs + (Ve - Vs) * 0.8;
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const vArr2 = Vs + (Ve - Vs) * 0.82;
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let p1a, p2a;
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if (this.process === 'isothermal') { p1a = P1*V1/vArr; p2a = P1*V1/vArr2; }
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else if (this.process === 'isobaric') { p1a = P1; p2a = P1; }
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else { p1a = P1*Math.pow(V1/vArr,gamma); p2a = P1*Math.pow(V1/vArr2,gamma); }
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/* ensure arrow points from 1→2 */
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const dir = V2 > V1 ? 1 : -1;
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this._arrowHead(ctx,
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this._vx(vArr + dir*0), this._py(p1a + dir*0),
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this._vx(vArr2 + dir*0), this._py(p2a + dir*0), color);
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}
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ctx.restore();
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}
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_arrowHead(ctx, x1, y1, x2, y2, color) {
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const angle = Math.atan2(y2 - y1, x2 - x1);
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const s = 10;
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ctx.fillStyle = color;
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ctx.beginPath();
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ctx.moveTo(x2, y2);
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ctx.lineTo(x2 - s * Math.cos(angle - 0.4), y2 - s * Math.sin(angle - 0.4));
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ctx.lineTo(x2 - s * Math.cos(angle + 0.4), y2 - s * Math.sin(angle + 0.4));
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ctx.closePath(); ctx.fill();
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}
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_drawPoints(ctx) {
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const { P2, V2 } = this._state2();
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const color = this._COLORS[this.process];
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const dot = (x, y, fill, label, textX, textY) => {
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ctx.fillStyle = fill;
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ctx.beginPath(); ctx.arc(x, y, 7, 0, Math.PI * 2); ctx.fill();
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ctx.strokeStyle = 'rgba(255,255,255,0.55)'; ctx.lineWidth = 1.5;
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ctx.beginPath(); ctx.arc(x, y, 7, 0, Math.PI * 2); ctx.stroke();
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ctx.font = 'bold 11px Manrope, system-ui, sans-serif';
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ctx.fillStyle = fill; ctx.textAlign = 'center'; ctx.textBaseline = 'bottom';
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ctx.fillText(label, textX, textY);
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};
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const x1 = this._vx(this.V1), y1 = this._py(this.P1);
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const x2 = this._vx(V2), y2 = this._py(P2);
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dot(x1, y1, '#9B5DE5', '1', x1 - 12, y1 - 4);
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dot(x2, y2, color, '2', x2 + 12, y2 - 4);
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}
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_drawInfoBox(ctx) {
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const info = this.info();
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const color = this._COLORS[info.process];
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const names = { isothermal:'Изотермический', isochoric:'Изохорный', isobaric:'Изобарный', adiabatic:'Адиабатический' };
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const formulas = { isothermal:'PV = const', isochoric:'V = const', isobaric:'P = const', adiabatic:'PV^γ = const' };
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const bx = this.ML + 6, by = this.MT + 6;
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const boxW = 205, boxH = 98;
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ctx.fillStyle = 'rgba(13,13,26,0.9)';
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ctx.beginPath(); ctx.roundRect(bx, by, boxW, boxH, 8); ctx.fill();
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ctx.font = 'bold 11px Manrope, system-ui, sans-serif';
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ctx.fillStyle = color; ctx.textAlign = 'left'; ctx.textBaseline = 'top';
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ctx.fillText(`${names[info.process]} ${formulas[info.process]}`, bx + 10, by + 8);
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ctx.font = '11px Manrope, system-ui, sans-serif';
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ctx.fillStyle = 'rgba(255,255,255,0.6)';
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ctx.fillText(`T₁ = ${info.T1} K → T₂ = ${info.T2} K`, bx + 10, by + 28);
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const wColor = info.W_raw > 0 ? '#7BF5A4' : info.W_raw < 0 ? '#EF476F' : 'rgba(255,255,255,0.4)';
|
||||
const qColor = info.Q_raw > 0 ? '#FFD166' : info.Q_raw < 0 ? '#06D6E0' : 'rgba(255,255,255,0.4)';
|
||||
|
||||
ctx.fillStyle = 'rgba(255,255,255,0.4)'; ctx.fillText('W =', bx + 10, by + 48);
|
||||
ctx.fillStyle = wColor; ctx.fillText(`${info.W} Дж`, bx + 38, by + 48);
|
||||
|
||||
ctx.fillStyle = 'rgba(255,255,255,0.4)'; ctx.fillText('Q =', bx + 10, by + 65);
|
||||
ctx.fillStyle = qColor; ctx.fillText(`${info.Q} Дж`, bx + 38, by + 65);
|
||||
|
||||
ctx.fillStyle = 'rgba(255,255,255,0.4)'; ctx.fillText('ΔU =', bx + 10, by + 82);
|
||||
ctx.fillStyle = 'rgba(255,255,255,0.65)'; ctx.fillText(`${info.dU} Дж`, bx + 40, by + 82);
|
||||
}
|
||||
|
||||
/* ── events ─────────────────────────────────── */
|
||||
|
||||
_bindEvents() {
|
||||
const cv = this.canvas;
|
||||
|
||||
const pos = e => {
|
||||
const r = cv.getBoundingClientRect();
|
||||
const t = e.touches ? e.touches[0] : e;
|
||||
return {
|
||||
px: (t.clientX - r.left) * (this.W / r.width),
|
||||
py: (t.clientY - r.top) * (this.H / r.height),
|
||||
};
|
||||
};
|
||||
|
||||
const hit = (px, py) => {
|
||||
const x1 = this._vx(this.V1), y1 = this._py(this.P1);
|
||||
if (Math.hypot(px - x1, py - y1) < 18) return 'state1';
|
||||
const { P2, V2 } = this._state2();
|
||||
const x2 = this._vx(V2), y2 = this._py(P2);
|
||||
if (Math.hypot(px - x2, py - y2) < 18) return 'state2';
|
||||
return null;
|
||||
};
|
||||
|
||||
const clampV = v => Math.max(this.Vmin + 0.5, Math.min(this.Vmax - 0.5, v));
|
||||
const clampP = p => Math.max(this.Pmin + 0.1, Math.min(this.Pmax - 0.1, p));
|
||||
|
||||
const onDown = e => { const { px, py } = pos(e); this._drag = hit(px, py); };
|
||||
|
||||
const onMove = e => {
|
||||
if (!this._drag) return;
|
||||
if (e.cancelable) e.preventDefault();
|
||||
const { px, py } = pos(e);
|
||||
const v = this._xv(px), p = this._yp(py);
|
||||
|
||||
if (this._drag === 'state1') {
|
||||
this.V1 = clampV(v); this.P1 = clampP(p);
|
||||
} else {
|
||||
/* constrain state2 to current process curve */
|
||||
switch (this.process) {
|
||||
case 'isothermal': case 'isobaric': case 'adiabatic': {
|
||||
const V2 = clampV(v);
|
||||
this._ratio = Math.max(0.01, Math.min(0.99, (V2 / this.V1 - 0.2) / 3.3));
|
||||
break;
|
||||
}
|
||||
case 'isochoric': {
|
||||
const P2 = clampP(p);
|
||||
this._ratio = Math.max(0.01, Math.min(0.99, (P2 / this.P1 - 0.2) / 3.3));
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
this.draw(); this._emit();
|
||||
};
|
||||
|
||||
const onUp = () => { this._drag = null; };
|
||||
|
||||
cv.addEventListener('mousedown', onDown);
|
||||
window.addEventListener('mousemove', onMove);
|
||||
window.addEventListener('mouseup', onUp);
|
||||
cv.addEventListener('touchstart', e => { if (e.touches.length === 1) onDown(e); }, { passive: true });
|
||||
cv.addEventListener('touchmove', e => onMove(e), { passive: false });
|
||||
cv.addEventListener('touchend', onUp);
|
||||
cv.addEventListener('mousemove', e => {
|
||||
if (this._drag) { cv.style.cursor = 'grabbing'; return; }
|
||||
const { px, py } = pos(e);
|
||||
cv.style.cursor = hit(px, py) ? 'grab' : 'default';
|
||||
});
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user