mirror of
https://github.com/praktimarc/kst4contest.git
synced 2026-07-14 00:26:52 +02:00
github-actions[bot]
510 lines
17 KiB
JavaScript
510 lines
17 KiB
JavaScript
(() => {
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"use strict";
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const canvas = document.querySelector("[data-hero-radio-fx]");
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if (!(canvas instanceof HTMLCanvasElement)) return;
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const hero = canvas.closest(".hero");
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const ctx = canvas.getContext("2d", { alpha: true, desynchronized: true });
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if (!(hero instanceof HTMLElement) || !ctx) return;
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const reducedMotion = matchMedia("(prefers-reduced-motion: reduce)");
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const coarsePointer = matchMedia("(pointer: coarse)");
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const state = {
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width: 0,
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height: 0,
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dpr: 1,
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running: false,
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visible: true,
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lastFrame: 0,
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spawnTime: 0,
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beamTime: 0,
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frameId: 0,
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pointer: { x: 0, y: 0, active: false },
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planes: [],
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beams: [],
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reflections: []
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};
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const clamp = (v, min, max) => Math.max(min, Math.min(max, v));
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const random = (min, max) => min + Math.random() * (max - min);
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function css(name, fallback) {
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return getComputedStyle(document.documentElement).getPropertyValue(name).trim() || fallback;
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}
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function palette() {
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return {
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plane: css("--fx-plane", "#79ff73"),
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planeMuted: css("--fx-plane-muted", "rgba(121,255,115,.42)"),
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beam: css("--fx-beam", "#52ff65"),
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beamGlow: css("--fx-beam-glow", "rgba(82,255,101,.28)"),
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reflection: css("--fx-reflection", "#d2ffc8"),
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trail: css("--fx-trail", "rgba(121,255,115,.17)"),
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grid: css("--fx-grid", "rgba(121,255,115,.055)")
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};
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}
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function roundedRect(x, y, width, height, radius) {
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const r = Math.min(radius, width / 2, height / 2);
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ctx.beginPath();
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ctx.moveTo(x + r, y);
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ctx.arcTo(x + width, y, x + width, y + height, r);
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ctx.arcTo(x + width, y + height, x, y + height, r);
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ctx.arcTo(x, y + height, x, y, r);
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ctx.arcTo(x, y, x + width, y, r);
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ctx.closePath();
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}
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function resize() {
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const rect = hero.getBoundingClientRect();
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state.width = Math.max(1, Math.round(rect.width));
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state.height = Math.max(1, Math.round(rect.height));
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state.dpr = Math.min(devicePixelRatio || 1, 1.5);
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canvas.width = Math.round(state.width * state.dpr);
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canvas.height = Math.round(state.height * state.dpr);
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canvas.style.width = `${state.width}px`;
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canvas.style.height = `${state.height}px`;
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ctx.setTransform(state.dpr, 0, 0, state.dpr, 0, 0);
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if (!state.pointer.active) {
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state.pointer.x = state.width * 0.55;
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state.pointer.y = state.height * 0.42;
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}
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}
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function stations() {
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const targetX = state.width * 0.54;
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const targetY = state.height * 0.43;
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const left = { x: state.width * 0.075, y: state.height * 0.82, label: "JN49EM" };
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const right = { x: state.width * 0.925, y: state.height * 0.80, label: "JO66MD" };
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left.angle = Math.atan2(targetY - left.y, targetX - left.x);
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right.angle = Math.atan2(targetY - right.y, targetX - right.x);
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return [left, right];
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}
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function planeLimit() {
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if (coarsePointer.matches) return 5;
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return state.width < 900 ? 7 : 12;
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}
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function createPlane() {
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const margin = 55;
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const edge = Math.floor(Math.random() * 4);
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let x;
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let y;
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if (edge === 0) {
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x = random(0, state.width);
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y = -margin;
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} else if (edge === 1) {
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x = state.width + margin;
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y = random(0, state.height);
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} else if (edge === 2) {
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x = random(0, state.width);
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y = state.height + margin;
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} else {
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x = -margin;
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y = random(0, state.height);
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}
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const tx = state.pointer.active ? state.pointer.x : state.width * random(0.38, 0.72);
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const ty = state.pointer.active ? state.pointer.y : state.height * random(0.20, 0.72);
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const angle = Math.atan2(ty - y, tx - x);
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const speed = random(18, 34);
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return {
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x, y, angle,
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vx: Math.cos(angle) * speed,
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vy: Math.sin(angle) * speed,
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size: random(5.5, 9),
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age: 0,
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maxAge: random(12, 20),
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steering: random(0.65, 1.2),
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wobble: random(0, Math.PI * 2),
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wobbleSpeed: random(0.7, 1.4),
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hit: 0
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};
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}
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function updatePlane(plane, dt) {
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plane.age += dt;
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plane.wobble += dt * plane.wobbleSpeed;
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const tx = state.pointer.active ? state.pointer.x : state.width * 0.56;
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const ty = state.pointer.active ? state.pointer.y : state.height * 0.44;
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const desired = Math.atan2(ty - plane.y, tx - plane.x);
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let diff = desired - plane.angle;
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while (diff > Math.PI) diff -= Math.PI * 2;
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while (diff < -Math.PI) diff += Math.PI * 2;
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plane.angle += diff * plane.steering * dt;
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const speed = Math.hypot(plane.vx, plane.vy);
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const wobble = Math.sin(plane.wobble) * 0.14;
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plane.vx = Math.cos(plane.angle + wobble) * speed;
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plane.vy = Math.sin(plane.angle + wobble) * speed;
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plane.x += plane.vx * dt;
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plane.y += plane.vy * dt;
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plane.hit = Math.max(0, plane.hit - dt * 1.8);
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}
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function expired(plane) {
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const margin = 180;
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return plane.age > plane.maxAge || plane.x < -margin || plane.x > state.width + margin || plane.y < -margin || plane.y > state.height + margin;
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}
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function beamTarget() {
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if (!state.planes.length) return null;
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const tx = state.pointer.active ? state.pointer.x : state.width * 0.56;
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const ty = state.pointer.active ? state.pointer.y : state.height * 0.44;
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const nearby = state.planes
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.map(plane => ({ plane, distance: Math.hypot(plane.x - tx, plane.y - ty) }))
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.filter(item => item.distance < 280)
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.sort((a, b) => a.distance - b.distance);
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return nearby[0]?.plane || state.planes[Math.floor(Math.random() * state.planes.length)];
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}
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function createBeam(target) {
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const source = stations()
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.map(station => ({ station, distance: Math.hypot(target.x - station.x, target.y - station.y) }))
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.sort((a, b) => a.distance - b.distance)[0].station;
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const angle = Math.atan2(target.y - source.y, target.x - source.x);
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const tip = 45;
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state.beams.push({
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startX: source.x + Math.cos(angle) * tip,
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startY: source.y + Math.sin(angle) * tip,
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endX: target.x,
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endY: target.y,
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age: 0,
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maxAge: 0.72
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});
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target.hit = 1;
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const values = [50, 75, 100];
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state.reflections.push({
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x: target.x,
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y: target.y,
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age: 0,
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maxAge: 1.25,
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radius: random(8, 13),
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probability: values[Math.floor(Math.random() * values.length)]
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});
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}
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function updateEffects(dt) {
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state.beams.forEach(beam => beam.age += dt);
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state.beams = state.beams.filter(beam => beam.age < beam.maxAge);
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state.reflections.forEach(r => {
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r.age += dt;
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r.radius += dt * 30;
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});
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state.reflections = state.reflections.filter(r => r.age < r.maxAge);
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}
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function drawGrid(p) {
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ctx.save();
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ctx.strokeStyle = p.grid;
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ctx.lineWidth = 1;
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const spacing = 54;
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for (let x = spacing; x < state.width; x += spacing) {
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ctx.beginPath();
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ctx.moveTo(x, 0);
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ctx.lineTo(x, state.height);
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ctx.stroke();
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}
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for (let y = spacing; y < state.height; y += spacing) {
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ctx.beginPath();
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ctx.moveTo(0, y);
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ctx.lineTo(state.width, y);
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ctx.stroke();
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}
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ctx.restore();
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}
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function drawRadar(p) {
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const x = state.pointer.active ? state.pointer.x : state.width * 0.56;
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const y = state.pointer.active ? state.pointer.y : state.height * 0.44;
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ctx.save();
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ctx.strokeStyle = p.planeMuted;
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ctx.lineWidth = 1;
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for (const radius of [24, 48, 82]) {
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ctx.globalAlpha = 0.24 - radius / 500;
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ctx.beginPath();
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ctx.arc(x, y, radius, 0, Math.PI * 2);
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ctx.stroke();
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}
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ctx.globalAlpha = 0.2;
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ctx.beginPath();
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ctx.moveTo(x - 100, y);
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ctx.lineTo(x + 100, y);
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ctx.moveTo(x, y - 100);
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ctx.lineTo(x, y + 100);
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ctx.stroke();
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ctx.restore();
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}
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function drawYagi(station, p) {
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ctx.save();
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ctx.translate(station.x, station.y);
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ctx.rotate(station.angle);
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ctx.strokeStyle = p.plane;
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ctx.fillStyle = p.plane;
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ctx.lineWidth = 1.5;
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ctx.lineCap = "round";
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ctx.shadowColor = p.beamGlow;
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ctx.shadowBlur = 9;
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ctx.beginPath();
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ctx.moveTo(-30, 26);
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ctx.lineTo(-30, -5);
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(-32, 0);
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ctx.lineTo(43, 0);
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ctx.stroke();
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for (const element of [
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{ x: -27, length: 34 },
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{ x: -12, length: 28 },
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{ x: 2, length: 22 },
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{ x: 14, length: 19 },
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{ x: 25, length: 16 },
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{ x: 35, length: 13 }
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]) {
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ctx.beginPath();
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ctx.moveTo(element.x, -element.length / 2);
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ctx.lineTo(element.x, element.length / 2);
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ctx.stroke();
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}
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ctx.beginPath();
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ctx.arc(-12, 0, 3.2, 0, Math.PI * 2);
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ctx.fill();
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ctx.restore();
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ctx.save();
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ctx.font = "700 11px Inter, system-ui, sans-serif";
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const width = ctx.measureText(station.label).width + 14;
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const x = station.x - width / 2;
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const y = station.y + 32;
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ctx.fillStyle = "rgba(6,18,10,.86)";
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ctx.strokeStyle = p.planeMuted;
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roundedRect(x, y, width, 23, 6);
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ctx.fill();
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ctx.stroke();
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ctx.fillStyle = p.plane;
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ctx.textAlign = "center";
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ctx.textBaseline = "middle";
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ctx.fillText(station.label, station.x, y + 11.5);
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ctx.restore();
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}
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function drawPlane(plane, p) {
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ctx.save();
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ctx.translate(plane.x, plane.y);
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ctx.rotate(plane.angle);
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ctx.globalAlpha = clamp(Math.min(plane.age * 1.8, (plane.maxAge - plane.age) * 1.8), 0, 1);
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ctx.strokeStyle = p.trail;
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ctx.lineWidth = 1;
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ctx.beginPath();
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ctx.moveTo(-plane.size * 4.5, 0);
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ctx.lineTo(-plane.size * 1.4, 0);
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ctx.stroke();
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ctx.fillStyle = plane.hit > 0 ? p.reflection : p.plane;
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ctx.shadowColor = plane.hit > 0 ? p.reflection : p.beamGlow;
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ctx.shadowBlur = plane.hit > 0 ? 16 : 5;
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const s = plane.size;
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ctx.beginPath();
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ctx.moveTo(s * 1.65, 0);
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ctx.lineTo(-s * 0.7, s * 0.34);
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ctx.lineTo(-s * 0.15, s * 1.05);
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ctx.lineTo(-s * 0.65, s * 1.08);
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ctx.lineTo(-s * 1.35, s * 0.3);
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ctx.lineTo(-s * 1.7, s * 0.28);
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ctx.lineTo(-s * 1.12, 0);
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ctx.lineTo(-s * 1.7, -s * 0.28);
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ctx.lineTo(-s * 1.35, -s * 0.3);
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ctx.lineTo(-s * 0.65, -s * 1.08);
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ctx.lineTo(-s * 0.15, -s * 1.05);
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ctx.lineTo(-s * 0.7, -s * 0.34);
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ctx.closePath();
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ctx.fill();
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ctx.restore();
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}
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function drawBeam(beam, p) {
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const progress = beam.age / beam.maxAge;
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const alpha = Math.sin(progress * Math.PI);
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ctx.save();
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ctx.globalAlpha = alpha;
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ctx.strokeStyle = p.beamGlow;
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ctx.lineWidth = 8;
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ctx.shadowColor = p.beam;
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ctx.shadowBlur = 15;
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ctx.setLineDash([10, 6]);
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ctx.lineDashOffset = -progress * 36;
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ctx.beginPath();
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ctx.moveTo(beam.startX, beam.startY);
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ctx.lineTo(beam.endX, beam.endY);
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ctx.stroke();
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ctx.setLineDash([]);
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ctx.strokeStyle = p.beam;
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ctx.lineWidth = 1.8;
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ctx.shadowBlur = 5;
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ctx.beginPath();
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ctx.moveTo(beam.startX, beam.startY);
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ctx.lineTo(beam.endX, beam.endY);
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ctx.stroke();
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ctx.restore();
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}
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function drawReflection(r, p) {
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const progress = r.age / r.maxAge;
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const alpha = 1 - progress;
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ctx.save();
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ctx.translate(r.x, r.y);
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ctx.globalAlpha = alpha;
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ctx.strokeStyle = p.reflection;
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ctx.lineWidth = 1.6;
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ctx.shadowColor = p.beam;
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ctx.shadowBlur = 18;
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for (const scale of [1, 1.65]) {
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ctx.globalAlpha = alpha * (scale === 1 ? 1 : 0.55);
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ctx.beginPath();
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ctx.arc(0, 0, r.radius * scale, 0, Math.PI * 2);
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ctx.stroke();
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}
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ctx.globalAlpha = alpha * 0.8;
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const cross = r.radius * 1.25;
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ctx.beginPath();
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ctx.moveTo(-cross, 0);
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ctx.lineTo(cross, 0);
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ctx.moveTo(0, -cross);
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ctx.lineTo(0, cross);
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ctx.stroke();
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ctx.globalAlpha = alpha;
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ctx.fillStyle = p.reflection;
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ctx.beginPath();
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ctx.arc(0, 0, 3.8, 0, Math.PI * 2);
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ctx.fill();
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ctx.restore();
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ctx.save();
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const label = `${r.probability}%`;
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ctx.font = "800 12px Inter, system-ui, sans-serif";
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const width = ctx.measureText(label).width + 16;
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const height = 25;
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const x = r.x + r.radius + 12;
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const y = r.y - r.radius - 17;
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ctx.globalAlpha = clamp(alpha * 1.25, 0, 1);
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ctx.fillStyle = "rgba(6,18,10,.91)";
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ctx.strokeStyle = p.plane;
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ctx.shadowColor = p.beamGlow;
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ctx.shadowBlur = 10;
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roundedRect(x, y, width, height, 6);
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ctx.fill();
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ctx.stroke();
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ctx.shadowBlur = 0;
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ctx.fillStyle = p.reflection;
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ctx.textAlign = "center";
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ctx.textBaseline = "middle";
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ctx.fillText(label, x + width / 2, y + height / 2);
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ctx.restore();
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}
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function draw(staticOnly = false) {
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const p = palette();
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ctx.clearRect(0, 0, state.width, state.height);
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drawGrid(p);
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drawRadar(p);
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stations().forEach(station => drawYagi(station, p));
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if (staticOnly) return;
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state.planes.forEach(plane => drawPlane(plane, p));
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state.beams.forEach(beam => drawBeam(beam, p));
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state.reflections.forEach(r => drawReflection(r, p));
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}
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function animate(timestamp) {
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if (!state.running) return;
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const dt = clamp((timestamp - state.lastFrame) / 1000 || 0, 0, 0.05);
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state.lastFrame = timestamp;
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if (!state.visible || document.hidden) {
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state.frameId = requestAnimationFrame(animate);
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return;
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}
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state.spawnTime += dt;
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state.beamTime += dt;
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const spawnInterval = coarsePointer.matches ? 2.2 : 1.15;
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const beamInterval = coarsePointer.matches ? 3.3 : 1.8;
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if (state.spawnTime >= spawnInterval && state.planes.length < planeLimit()) {
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state.spawnTime = 0;
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state.planes.push(createPlane());
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}
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if (state.beamTime >= beamInterval && state.planes.length) {
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state.beamTime = 0;
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const target = beamTarget();
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if (target) createBeam(target);
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}
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state.planes.forEach(plane => updatePlane(plane, dt));
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state.planes = state.planes.filter(plane => !expired(plane));
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updateEffects(dt);
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draw(false);
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state.frameId = requestAnimationFrame(animate);
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}
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function start() {
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cancelAnimationFrame(state.frameId);
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resize();
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if (reducedMotion.matches) {
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state.running = false;
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draw(true);
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return;
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}
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state.running = true;
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state.lastFrame = performance.now();
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if (!state.planes.length) {
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const count = coarsePointer.matches ? 2 : 5;
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for (let i = 0; i < count; i++) {
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const plane = createPlane();
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plane.age = Math.random() * 2;
|
|
state.planes.push(plane);
|
|
}
|
|
}
|
|
state.frameId = requestAnimationFrame(animate);
|
|
}
|
|
|
|
hero.addEventListener("pointermove", event => {
|
|
const rect = hero.getBoundingClientRect();
|
|
state.pointer.x = clamp(event.clientX - rect.left, 0, rect.width);
|
|
state.pointer.y = clamp(event.clientY - rect.top, 0, rect.height);
|
|
state.pointer.active = true;
|
|
}, { passive: true });
|
|
|
|
hero.addEventListener("pointerleave", () => state.pointer.active = false);
|
|
addEventListener("resize", resize, { passive: true });
|
|
document.addEventListener("visibilitychange", () => state.lastFrame = performance.now());
|
|
reducedMotion.addEventListener("change", start);
|
|
|
|
new ResizeObserver(() => {
|
|
resize();
|
|
if (reducedMotion.matches) draw(true);
|
|
}).observe(hero);
|
|
|
|
new IntersectionObserver(entries => {
|
|
state.visible = entries[0]?.isIntersecting ?? true;
|
|
state.lastFrame = performance.now();
|
|
}, { threshold: 0.05 }).observe(hero);
|
|
|
|
start();
|
|
})();
|