468 lines
15 KiB
JavaScript
468 lines
15 KiB
JavaScript
// Canvas renderer. Reads game state every frame; never mutates it.
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// Glowing rings are pre-rendered sprites (shadowBlur is far too slow to
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// run per frame on phones), scaled with drawImage.
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import { TIMING } from './game.js';
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import { SHAPES } from './themes.js';
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import { TEAM_NAMES } from './modes.js';
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import { createReveal, createRipple, clamp01, easeOutCubic } from './reveals.js';
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const TAU = Math.PI * 2;
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const SPRITE_SCALE = 1.7; // sprites are drawn at the largest ring size, then scaled down
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function easeOutBack(t) {
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const c1 = 1.70158;
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const c3 = c1 + 1;
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return 1 + c3 * Math.pow(t - 1, 3) + c1 * Math.pow(t - 1, 2);
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}
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export class Renderer {
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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.sprites = new Map();
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this.ripples = [];
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this.reveal = null;
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this.shards = new Map();
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this.theme = null;
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this.resize();
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}
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setTheme(theme) {
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this.theme = theme;
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this.sprites.clear();
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}
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resize() {
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const dpr = Math.min(window.devicePixelRatio || 1, 3);
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const w = this.canvas.clientWidth || window.innerWidth;
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const h = this.canvas.clientHeight || window.innerHeight;
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this.dpr = dpr;
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this.w = w;
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this.h = h;
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this.canvas.width = Math.round(w * dpr);
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this.canvas.height = Math.round(h * dpr);
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this.R = Math.max(40, Math.min(64, Math.min(w, h) * 0.115));
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this.sprites.clear();
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}
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colorOf(ring) {
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return ring.colorIdx < 0 ? this.theme.spectator : this.theme.colors[ring.colorIdx % this.theme.colors.length];
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}
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lineWidth() {
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return this.R * 0.13 * this.theme.lineScale;
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}
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// ---- events from the game ----------------------------------------------
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onEvent(type, data, now, game) {
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const R = this.R;
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switch (type) {
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case 'join':
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this.ripples.push(createRipple(data.ring.x, data.ring.y, this.colorOf(data.ring), now, R * 1.8, 450, 3));
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break;
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case 'beat':
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for (const r of game.activeRings()) this.ripples.push(createRipple(r.x, r.y, this.colorOf(r), now, R * 2.1, 500, 3));
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break;
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case 'orderStep': {
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const r = game.rings.get(data.id);
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if (r) this.ripples.push(createRipple(r.x, r.y, this.colorOf(r), now, R * 2.6, 600, 5));
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break;
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}
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case 'reveal': {
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const targets =
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data.style === 'teams'
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? game.players.map((id) => game.rings.get(id)).filter(Boolean).map((ring) => ({ ring, color: this.theme.team[game.plan.teams.get(ring.id)] }))
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: data.winners.map((id) => game.rings.get(id)).filter(Boolean).map((ring) => ({ ring, color: this.colorOf(ring) }));
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this.reveal = createReveal(data.style, { targets, w: this.w, h: this.h, R, start: now, palette: this.theme.colors });
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break;
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}
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case 'phase':
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if (data.phase !== 'result') this.reveal = null;
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if (data.phase === 'idle' || data.phase === 'gathering') this.shards.clear();
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break;
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case 'restart':
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this.reveal = null;
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this.shards.clear();
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break;
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}
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}
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// ---- sprites -----------------------------------------------------------
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sprite(color) {
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let s = this.sprites.get(color);
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if (s) return s;
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const { dpr, theme } = this;
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const r = this.R * SPRITE_SCALE;
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const lw = this.lineWidth() * SPRITE_SCALE;
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const pad = r * 0.55;
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const half = r + pad;
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const c = document.createElement('canvas');
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c.width = c.height = Math.ceil(half * 2 * dpr);
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const g = c.getContext('2d');
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g.scale(dpr, dpr);
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// faint inner fill
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const fill = g.createRadialGradient(half, half, r * 0.3, half, half, r);
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fill.addColorStop(0, 'rgba(0,0,0,0)');
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fill.addColorStop(1, color + '38');
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g.fillStyle = fill;
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g.beginPath();
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g.arc(half, half, r, 0, TAU);
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g.fill();
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g.strokeStyle = color;
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g.lineWidth = lw;
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if (theme.glow) {
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g.shadowColor = color;
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g.shadowBlur = r * 0.5 * theme.glow * dpr;
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g.beginPath();
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g.arc(half, half, r, 0, TAU);
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g.stroke();
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}
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g.beginPath();
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g.arc(half, half, r, 0, TAU);
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g.stroke();
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g.shadowBlur = 0;
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if (theme.additive) {
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// white-hot core, neon tube style
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g.strokeStyle = 'rgba(255,255,255,0.7)';
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g.lineWidth = lw * 0.3;
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g.stroke();
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}
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s = { canvas: c, half, base: r };
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this.sprites.set(color, s);
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return s;
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}
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// ---- drawing -----------------------------------------------------------
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draw(game, now) {
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// Cheaper and more reliable than trusting every resize/rotation event.
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const c = this.canvas;
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if (c.clientWidth !== this.w || c.clientHeight !== this.h || Math.min(window.devicePixelRatio || 1, 3) !== this.dpr) this.resize();
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const { ctx, dpr, w, h, theme } = this;
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ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
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const shake = this.reveal?.shake?.(now);
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if (shake) ctx.translate(shake[0], shake[1]);
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ctx.globalCompositeOperation = 'source-over';
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ctx.globalAlpha = 1;
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ctx.fillStyle = theme.bg;
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ctx.fillRect(-20, -20, w + 40, h + 40);
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if (this.reveal) this.reveal.drawBack(ctx, now);
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// Two passes so highlighted rings sit on top.
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if (theme.additive) ctx.globalCompositeOperation = 'lighter';
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const hl = game.highlight;
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for (const ring of game.rings.values()) if (!hl?.has(ring.id)) this.drawRing(ctx, ring, game, now);
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for (const ring of game.rings.values()) if (hl?.has(ring.id)) this.drawRing(ctx, ring, game, now);
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this.ripples = this.ripples.filter((r) => !r.done(now));
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for (const r of this.ripples) r.draw(ctx, now);
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ctx.globalCompositeOperation = 'source-over';
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if (this.reveal) this.reveal.drawFront(ctx, now);
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this.drawLabels(ctx, game, now);
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}
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drawRing(ctx, ring, game, now) {
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const { theme } = this;
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const R = this.R;
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let scale = 1;
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let alpha = 1;
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let color = this.colorOf(ring);
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let shapeIdx = ring.colorIdx;
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const appear = clamp01((now - ring.bornAt) / 320);
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if (appear < 1) scale *= easeOutBack(appear);
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if (ring.goneAt) {
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const k = clamp01((now - ring.goneAt) / TIMING.ringFadeMs);
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scale *= 1 - 0.5 * k;
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alpha *= 1 - k;
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}
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if (ring.late) {
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this.drawShape(ctx, ring.x, ring.y, R * 0.75 * scale, theme.spectator, alpha * 0.6, -1);
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return;
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}
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if (ring.outAt) {
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this.drawCrack(ctx, ring, color, now);
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return;
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}
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const phase = game.phase;
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const mode = game.plan?.mode;
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const hl = game.highlight;
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const isHl = !!hl?.has(ring.id);
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const pop = Math.exp(-(now - game.stepAt) / 90);
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if (phase === 'idle' || phase === 'gathering' || phase === 'chicken') {
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scale *= 1 + 0.05 * Math.sin(((now - ring.bornAt) / 1000) * TAU * 0.7);
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if (phase === 'chicken') alpha *= 0.55;
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} else if (phase === 'countdown') {
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const bp = ((now - game.phaseAt) % TIMING.beatMs) / TIMING.beatMs;
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scale *= 1 + 0.2 * Math.exp(-bp * 6);
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} else if (mode === 'teams') {
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const team = phase === 'result' ? game.plan.teams.get(ring.id) : game.displayTeams?.get(ring.id);
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if (team != null) {
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color = theme.team[team];
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shapeIdx = team;
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}
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scale *= phase === 'result' ? 1.1 + 0.04 * Math.sin(now / 300) : 1 + 0.1 * pop;
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} else if (phase === 'result') {
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if (mode === 'order') {
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if (isHl) scale *= 1.3 + 0.05 * Math.sin(now / 250);
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} else if (isHl) {
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scale *= 1.35 + 0.05 * Math.sin(now / 250);
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if (this.reveal?.winnerWhite) color = '#ffffff';
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} else {
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const k = clamp01((now - game.revealAt) / 650);
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if (k >= 1) return;
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scale *= 1 - k * k;
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alpha *= 1 - k;
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}
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} else if (phase === 'ordering') {
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const num = game.orderNums.get(ring.id);
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if (isHl) scale *= 1.2 + 0.15 * pop;
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else if (!num) {
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scale *= 0.85;
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alpha *= 0.4;
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}
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} else {
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// suspense / elimPause
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if (isHl) scale *= 1.18 + 0.14 * pop;
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else if (hl) {
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scale *= 0.86;
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alpha *= 0.4;
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}
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}
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this.drawShape(ctx, ring.x, ring.y, R * scale, color, alpha, theme.shapes ? shapeIdx : -1);
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if (phase === 'gathering') {
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const p = game.stableProgress(now);
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if (p > 0.08) this.drawArc(ctx, ring.x, ring.y, R * 1.32 * scale, color, 0.55, p);
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} else if (phase === 'countdown') {
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const bp = ((now - game.phaseAt) % TIMING.beatMs) / TIMING.beatMs;
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this.drawArc(ctx, ring.x, ring.y, R * 1.32 * scale, color, 0.3 + 0.6 * Math.exp(-bp * 5), 1);
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}
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}
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drawArc(ctx, x, y, r, color, alpha, p) {
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ctx.globalAlpha = alpha;
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ctx.strokeStyle = color;
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ctx.lineWidth = Math.max(2, this.R * 0.05);
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ctx.beginPath();
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ctx.arc(x, y, r, -Math.PI / 2, -Math.PI / 2 + TAU * p);
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ctx.stroke();
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ctx.globalAlpha = 1;
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}
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/** A ring (sprite) or, in high-contrast, a shape outline. */
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drawShape(ctx, x, y, r, color, alpha, shapeIdx) {
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if (r <= 0.5 || alpha <= 0.01) return;
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ctx.globalAlpha = alpha;
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if (shapeIdx >= 0) {
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const lw = this.lineWidth();
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tracePath(ctx, SHAPES[shapeIdx % SHAPES.length], x, y, r);
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ctx.lineJoin = 'round';
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ctx.strokeStyle = '#000';
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ctx.lineWidth = lw + 6;
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ctx.stroke();
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ctx.strokeStyle = color;
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ctx.lineWidth = lw;
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ctx.stroke();
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// second, inner outline doubles as a pattern cue
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tracePath(ctx, SHAPES[shapeIdx % SHAPES.length], x, y, r * 0.72);
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ctx.lineWidth = Math.max(2, lw * 0.35);
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ctx.stroke();
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} else {
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const s = this.sprite(color);
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const k = r / s.base;
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const size = s.half * 2 * k;
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ctx.drawImage(s.canvas, x - s.half * k, y - s.half * k, size, size);
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}
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ctx.globalAlpha = 1;
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}
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/** Elimination: the ring cracks, splits into shards that fall and fade. */
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drawCrack(ctx, ring, color, now) {
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const R = this.R;
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const t = (now - ring.outAt) / 1000;
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if (t > 1.3) return;
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let shards = this.shards.get(ring.id);
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if (!shards) {
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shards = [];
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const n = 7;
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let a = Math.random() * TAU;
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for (let i = 0; i < n; i++) {
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const span = (TAU / n) * (0.7 + Math.random() * 0.6);
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const mid = a + span / 2;
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shards.push({ a0: a, a1: a + span * 0.92, dx: Math.cos(mid), dy: Math.sin(mid), v: 70 + Math.random() * 110, spin: (Math.random() - 0.5) * 4 });
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a += span;
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}
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const cracks = [];
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for (let i = 0; i < 3; i++) {
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const ang = Math.random() * TAU;
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const pts = [];
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for (let j = 0; j <= 4; j++) {
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const rr = R * (0.55 + j * 0.2);
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const jit = (Math.random() - 0.5) * 0.35;
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pts.push([Math.cos(ang + jit) * rr, Math.sin(ang + jit) * rr]);
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}
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cracks.push(pts);
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}
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shards.cracks = cracks;
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this.shards.set(ring.id, shards);
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}
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const lw = this.lineWidth();
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if (t < 0.18) {
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// intact, flashing white and trembling, cracks spreading
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const j = 3 * (1 - t / 0.18);
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const x = ring.x + (Math.random() - 0.5) * j;
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const y = ring.y + (Math.random() - 0.5) * j;
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this.drawShape(ctx, x, y, R * 1.1, t < 0.06 ? '#ffffff' : color, 1, this.theme.shapes ? ring.colorIdx : -1);
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ctx.strokeStyle = '#fff';
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ctx.lineWidth = 2;
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const k = t / 0.18;
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for (const pts of shards.cracks) {
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ctx.beginPath();
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const m = Math.max(2, Math.ceil(pts.length * k));
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for (let i = 0; i < m && i < pts.length; i++) ctx[i ? 'lineTo' : 'moveTo'](x + pts[i][0], y + pts[i][1]);
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ctx.stroke();
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}
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return;
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}
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const tt = t - 0.18;
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const fade = clamp01(1 - tt / 1.0);
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ctx.lineCap = 'round';
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for (const s of shards) {
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const d = s.v * tt;
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const x = ring.x + s.dx * d;
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const y = ring.y + s.dy * d + 500 * tt * tt;
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ctx.save();
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ctx.translate(x, y);
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ctx.rotate(s.spin * tt);
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ctx.strokeStyle = color;
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ctx.globalAlpha = fade * 0.35;
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ctx.lineWidth = lw * 2.4;
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ctx.beginPath();
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ctx.arc(0, 0, R * 1.1, s.a0, s.a1);
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ctx.stroke();
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ctx.globalAlpha = fade;
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ctx.lineWidth = lw;
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ctx.stroke();
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ctx.restore();
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}
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ctx.globalAlpha = 1;
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ctx.lineCap = 'butt';
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}
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/** Number / team badges, placed on the side of the finger facing the
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* screen centre, since the hand covers the other side. */
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drawLabels(ctx, game, now) {
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const mode = game.plan?.mode;
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const showOrder = mode === 'order' && (game.phase === 'ordering' || game.phase === 'result');
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const showTeams = mode === 'teams' && game.phase === 'result';
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if (!showOrder && !showTeams) return;
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const R = this.R;
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const br = R * 0.42;
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ctx.textAlign = 'center';
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ctx.textBaseline = 'middle';
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ctx.font = `800 ${Math.round(br * 1.1)}px system-ui, -apple-system, "Segoe UI", Roboto, sans-serif`;
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for (const ring of game.rings.values()) {
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let text;
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let color;
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let at;
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if (showOrder) {
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const o = game.orderNums.get(ring.id);
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if (!o) continue;
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text = String(o.n);
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color = this.colorOf(ring);
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at = o.at;
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} else {
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const team = game.plan.teams.get(ring.id);
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if (team == null) continue;
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text = TEAM_NAMES[team];
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color = this.theme.team[team];
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at = game.revealAt;
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}
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let dx = this.w / 2 - ring.x;
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let dy = this.h / 2 - ring.y;
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const len = Math.hypot(dx, dy);
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if (len < R) {
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dx = 0;
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dy = -1;
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} else {
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dx /= len;
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dy /= len;
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}
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const s = easeOutBack(clamp01((now - at) / 350));
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const dist = R * 1.95;
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const x = ring.x + dx * dist;
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const y = ring.y + dy * dist;
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ctx.globalAlpha = clamp01(s);
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ctx.fillStyle = color;
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ctx.beginPath();
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ctx.arc(x, y, br * s, 0, TAU);
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ctx.fill();
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ctx.lineWidth = 3;
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ctx.strokeStyle = '#000';
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ctx.stroke();
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if (s > 0.3) {
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ctx.fillStyle = '#000';
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ctx.fillText(text, x, y + br * 0.05);
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}
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}
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ctx.globalAlpha = 1;
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}
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}
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function tracePath(ctx, shape, x, y, r) {
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ctx.beginPath();
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const poly = (n, rot, rr = r) => {
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for (let i = 0; i < n; i++) {
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const a = rot + (i / n) * TAU;
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ctx[i ? 'lineTo' : 'moveTo'](x + Math.cos(a) * rr, y + Math.sin(a) * rr);
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}
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ctx.closePath();
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};
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switch (shape) {
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case 'square':
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poly(4, Math.PI / 4, r * 1.05);
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break;
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case 'triangle':
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poly(3, -Math.PI / 2, r * 1.2);
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break;
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case 'diamond':
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poly(4, 0, r * 1.15);
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break;
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case 'hexagon':
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poly(6, 0);
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break;
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case 'pentagon':
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poly(5, -Math.PI / 2, r * 1.05);
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break;
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case 'star':
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for (let i = 0; i < 10; i++) {
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const a = -Math.PI / 2 + (i / 10) * TAU;
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const rr = i % 2 ? r * 0.62 : r * 1.2;
|
|
ctx[i ? 'lineTo' : 'moveTo'](x + Math.cos(a) * rr, y + Math.sin(a) * rr);
|
|
}
|
|
ctx.closePath();
|
|
break;
|
|
case 'cross': {
|
|
const a = r * 0.42;
|
|
const b = r * 1.05;
|
|
const pts = [[-a, -b], [a, -b], [a, -a], [b, -a], [b, a], [a, a], [a, b], [-a, b], [-a, a], [-b, a], [-b, -a], [-a, -a]];
|
|
pts.forEach(([px, py], i) => ctx[i ? 'lineTo' : 'moveTo'](x + px, y + py));
|
|
ctx.closePath();
|
|
break;
|
|
}
|
|
default:
|
|
ctx.arc(x, y, r, 0, TAU);
|
|
}
|
|
}
|