422 lines
12 KiB
HTML
422 lines
12 KiB
HTML
<!doctype html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>XY 示波器</title>
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<style>
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:root {
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color-scheme: dark;
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--ink: #e9f0ea;
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--muted: #91a69a;
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--line: #264139;
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--panel: #101a18;
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--field: #07110f;
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--signal: #81f2b1;
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--signal-faint: rgba(129, 242, 177, 0.15);
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--warning: #f1b766;
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--danger: #f27f72;
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}
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* { box-sizing: border-box; }
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body {
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min-width: 320px;
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height: 100vh;
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height: 100dvh;
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margin: 0;
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color: var(--ink);
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background: #0b1211;
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font-family: "Segoe UI", system-ui, sans-serif;
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overflow: hidden;
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}
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.app {
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width: min(1180px, calc(100% - 32px));
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height: 100vh;
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height: 100dvh;
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margin: 0 auto;
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padding: 28px 0 22px;
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display: grid;
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grid-template-rows: auto minmax(0, 1fr) auto;
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gap: 20px;
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}
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.topbar, .controls, .readout {
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display: flex;
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align-items: center;
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}
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.topbar {
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justify-content: space-between;
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gap: 18px;
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padding-bottom: 18px;
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border-bottom: 1px solid var(--line);
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}
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.brand {
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display: flex;
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align-items: center;
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gap: 12px;
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}
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.mark {
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width: 34px;
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height: 34px;
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display: grid;
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place-items: center;
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color: var(--signal);
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border: 1px solid var(--signal);
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font-family: Consolas, monospace;
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font-size: 13px;
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}
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h1 {
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margin: 0;
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font-size: 20px;
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font-weight: 650;
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letter-spacing: 0;
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}
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.subtitle, .status, .axis, .readout { color: var(--muted); }
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.subtitle {
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margin: 3px 0 0;
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font-size: 13px;
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}
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.status {
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display: flex;
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align-items: center;
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gap: 8px;
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font-size: 13px;
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white-space: nowrap;
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}
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.status-dot {
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width: 8px;
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height: 8px;
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border-radius: 50%;
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background: var(--warning);
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box-shadow: 0 0 0 3px rgba(241, 183, 102, 0.12);
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}
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.status-dot.active {
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background: var(--signal);
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box-shadow: 0 0 0 3px var(--signal-faint);
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}
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.scope-shell {
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min-height: 0;
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position: relative;
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overflow: hidden;
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border: 1px solid var(--line);
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background: var(--field);
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}
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canvas {
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display: block;
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width: 100%;
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height: 100%;
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}
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.axis {
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position: absolute;
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margin: 0;
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font: 12px Consolas, monospace;
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pointer-events: none;
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}
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.axis-x { right: 14px; bottom: 12px; }
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.axis-y { top: 12px; left: 14px; writing-mode: vertical-rl; transform: rotate(180deg); }
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.controls {
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justify-content: space-between;
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gap: 20px;
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flex-wrap: wrap;
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}
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.transport, .gain-control { display: flex; align-items: center; gap: 10px; }
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button {
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min-height: 38px;
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padding: 0 15px;
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border: 1px solid #3f6254;
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border-radius: 4px;
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color: #07110f;
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background: var(--signal);
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font: inherit;
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font-weight: 650;
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cursor: pointer;
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}
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button:hover { background: #a5facb; }
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button:focus-visible, input:focus-visible { outline: 2px solid #d5ffe4; outline-offset: 3px; }
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button.secondary {
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color: var(--ink);
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background: transparent;
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border-color: #466157;
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}
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button.secondary:hover { background: #192924; }
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button:disabled { opacity: 0.45; cursor: not-allowed; }
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.gain-control label { color: var(--muted); font-size: 13px; }
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output { min-width: 42px; color: var(--ink); font: 13px Consolas, monospace; text-align: right; }
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input[type="range"] {
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width: min(190px, 38vw);
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accent-color: var(--signal);
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}
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.readout {
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justify-content: space-between;
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gap: 12px;
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padding-top: 14px;
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border-top: 1px solid var(--line);
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font: 12px Consolas, monospace;
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flex-wrap: wrap;
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}
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.readout span { color: var(--ink); }
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.error { color: var(--danger); }
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@media (max-width: 620px) {
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.app { width: min(100% - 24px, 1180px); padding-top: 18px; gap: 16px; }
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.topbar { align-items: flex-start; }
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.status { padding-top: 5px; }
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.subtitle { display: none; }
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.controls { align-items: flex-start; }
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.gain-control { width: 100%; }
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input[type="range"] { flex: 1; width: auto; }
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.scope-shell { min-height: 0; }
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}
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@media (max-height: 700px) {
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.app { padding: 14px 0; gap: 12px; }
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.topbar { padding-bottom: 10px; }
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.readout { padding-top: 10px; }
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}
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@media (max-height: 480px) {
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.subtitle { display: none; }
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.mark { width: 28px; height: 28px; font-size: 11px; }
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h1 { font-size: 17px; }
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.controls { gap: 10px; }
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button { min-height: 32px; }
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}
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</style>
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</head>
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<body>
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<main class="app">
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<header class="topbar">
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<div class="brand">
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<div class="mark" aria-hidden="true">X/Y</div>
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<div>
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<h1>XY 示波器</h1>
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<p class="subtitle">麦克风立体声输入</p>
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</div>
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</div>
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<div class="status" aria-live="polite">
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<i class="status-dot" id="statusDot"></i>
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<span id="statusText">等待麦克风</span>
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</div>
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</header>
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<section class="scope-shell" aria-label="XY 音频示波器">
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<canvas id="scope"></canvas>
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<p class="axis axis-y">Y · 右声道</p>
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<p class="axis axis-x">X · 左声道</p>
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</section>
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<section class="controls" aria-label="示波器控制">
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<div class="transport">
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<button id="startButton" type="button">启用麦克风</button>
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<button id="stopButton" class="secondary" type="button" disabled>停止</button>
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</div>
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<div class="gain-control">
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<label for="gain">显示增益</label>
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<input id="gain" type="range" min="0.25" max="5" value="1" step="0.05">
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<output id="gainValue" for="gain">1.00x</output>
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</div>
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</section>
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<footer class="readout">
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<div>采样点 <span id="sampleCount">0</span></div>
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<div id="message">X 轴使用左声道，Y 轴使用右声道</div>
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</footer>
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</main>
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<script>
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const canvas = document.querySelector('#scope');
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const context = canvas.getContext('2d');
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const startButton = document.querySelector('#startButton');
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const stopButton = document.querySelector('#stopButton');
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const gainInput = document.querySelector('#gain');
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const gainValue = document.querySelector('#gainValue');
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const statusDot = document.querySelector('#statusDot');
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const statusText = document.querySelector('#statusText');
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const sampleCount = document.querySelector('#sampleCount');
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const message = document.querySelector('#message');
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let audioContext;
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let stream;
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let leftAnalyser;
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let rightAnalyser;
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let leftSamples;
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let rightSamples;
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let animationFrame;
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let displayGain = Number(gainInput.value);
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const traceSamples = 512;
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function resizeCanvas() {
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const ratio = window.devicePixelRatio || 1;
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const { width, height } = canvas.getBoundingClientRect();
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canvas.width = Math.max(1, Math.round(width * ratio));
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canvas.height = Math.max(1, Math.round(height * ratio));
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context.setTransform(ratio, 0, 0, ratio, 0, 0);
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}
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function drawGrid(width, height) {
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context.clearRect(0, 0, width, height);
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context.fillStyle = '#07110f';
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context.fillRect(0, 0, width, height);
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context.strokeStyle = '#173029';
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context.lineWidth = 1;
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const divisions = 8;
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for (let index = 0; index <= divisions; index += 1) {
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const x = Math.round((width / divisions) * index) + 0.5;
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const y = Math.round((height / divisions) * index) + 0.5;
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context.beginPath();
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context.moveTo(x, 0);
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context.lineTo(x, height);
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context.moveTo(0, y);
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context.lineTo(width, y);
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context.stroke();
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}
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context.strokeStyle = '#476b5b';
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context.beginPath();
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context.moveTo(width / 2, 0);
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context.lineTo(width / 2, height);
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context.moveTo(0, height / 2);
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context.lineTo(width, height / 2);
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context.stroke();
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}
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function render() {
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const { width, height } = canvas.getBoundingClientRect();
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drawGrid(width, height);
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if (leftAnalyser && rightAnalyser) {
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leftAnalyser.getFloatTimeDomainData(leftSamples);
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rightAnalyser.getFloatTimeDomainData(rightSamples);
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const centerX = width / 2;
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const centerY = height / 2;
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const scale = Math.min(width, height) * 0.46 * displayGain;
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let startIndex = 0;
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// Start at a consistent phase point so complex input does not fill the entire display.
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for (let index = 0; index < leftSamples.length; index += 1) {
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const previousIndex = (index - 1 + leftSamples.length) % leftSamples.length;
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if (leftSamples[previousIndex] <= 0 && leftSamples[index] > 0) {
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startIndex = index;
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break;
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}
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}
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context.beginPath();
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for (let index = 0; index < traceSamples; index += 1) {
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const sampleIndex = (startIndex + index) % leftSamples.length;
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const x = centerX - leftSamples[sampleIndex] * scale;
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const y = centerY + rightSamples[sampleIndex] * scale;
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if (index === 0) context.moveTo(x, y);
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else context.lineTo(x, y);
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}
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context.strokeStyle = 'rgba(129, 242, 177, 0.88)';
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context.lineWidth = 1;
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context.stroke();
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sampleCount.textContent = String(traceSamples);
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}
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animationFrame = requestAnimationFrame(render);
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}
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function setStatus(text, active, error = false) {
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statusText.textContent = text;
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statusDot.classList.toggle('active', active);
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message.classList.toggle('error', error);
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}
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function stopMicrophone() {
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cancelAnimationFrame(animationFrame);
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animationFrame = undefined;
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stream?.getTracks().forEach((track) => track.stop());
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audioContext?.close();
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stream = undefined;
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audioContext = undefined;
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leftAnalyser = undefined;
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rightAnalyser = undefined;
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sampleCount.textContent = '0';
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startButton.disabled = false;
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stopButton.disabled = true;
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setStatus('等待麦克风', false);
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message.textContent = 'X 轴使用左声道，Y 轴使用右声道';
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}
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async function startMicrophone() {
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startButton.disabled = true;
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setStatus('正在请求授权', false);
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message.textContent = '请在浏览器中允许访问麦克风';
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try {
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stream = await navigator.mediaDevices.getUserMedia({
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audio: { channelCount: { ideal: 2 }, echoCancellation: false, noiseSuppression: false, autoGainControl: false }
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});
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audioContext = new AudioContext();
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await audioContext.resume();
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const source = audioContext.createMediaStreamSource(stream);
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const splitter = audioContext.createChannelSplitter(2);
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leftAnalyser = audioContext.createAnalyser();
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rightAnalyser = audioContext.createAnalyser();
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leftAnalyser.fftSize = traceSamples;
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rightAnalyser.fftSize = traceSamples;
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leftAnalyser.smoothingTimeConstant = 0;
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rightAnalyser.smoothingTimeConstant = 0;
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leftSamples = new Float32Array(leftAnalyser.fftSize);
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rightSamples = new Float32Array(rightAnalyser.fftSize);
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source.connect(splitter);
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splitter.connect(leftAnalyser, 0);
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splitter.connect(rightAnalyser, 1);
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stream.getAudioTracks()[0].addEventListener('ended', stopMicrophone, { once: true });
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stopButton.disabled = false;
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setStatus('正在监听', true);
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message.textContent = '实时绘制左右声道之间的相位关系';
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if (!animationFrame) render();
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} catch (error) {
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startButton.disabled = false;
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setStatus('无法访问麦克风', false, true);
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message.textContent = error.name === 'NotAllowedError' ? '麦克风权限被拒绝' : '当前浏览器不支持或无法连接麦克风';
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}
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}
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gainInput.addEventListener('input', () => {
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displayGain = Number(gainInput.value);
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gainValue.textContent = `${displayGain.toFixed(2)}x`;
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});
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startButton.addEventListener('click', startMicrophone);
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stopButton.addEventListener('click', stopMicrophone);
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window.addEventListener('resize', resizeCanvas);
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window.addEventListener('beforeunload', stopMicrophone);
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resizeCanvas();
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render();
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</script>
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</body>
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</html>
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