新增: 音频可视化壁纸主题（WASAPI+FFT+Canvas）
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web/themes/audio-viz.html
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262
web/themes/audio-viz.html
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<canvas id="canvas" style="position:fixed;top:0;left:0;width:100%;height:100%;z-index:1;"></canvas>
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<script>
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var canvas = document.getElementById('canvas');
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var ctx = canvas.getContext('2d');
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var audioBins = new Array(128).fill(0);
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var vizStyle = window.__audioVizStyle || 'bars';
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var sensitivity = window.__audioVizSensitivity || 1.5;
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var colorScheme = window.__audioVizColors || 'neon';
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var idleTime = 0;
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var lastBinSum = 0;
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// 暴露配置热更新接口
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window.setAudioVizStyle = function(s) { vizStyle = s; };
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window.setAudioSensitivity = function(s) { sensitivity = s; };
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window.setAudioColorScheme = function(s) { colorScheme = s; };
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window.updateAudioDataFromGo = function(data) {
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for (var i = 0; i < Math.min(data.length, audioBins.length); i++) {
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audioBins[i] = data[i];
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}
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};
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function resizeCanvas() {
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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}
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resizeCanvas();
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window.addEventListener('resize', resizeCanvas);
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// 配色方案
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function getColor(i, total, alpha) {
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var t = i / total;
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switch (colorScheme) {
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case 'ocean':
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return 'hsla(' + (180 + t * 60) + ',70%,60%,' + alpha + ')';
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case 'fire':
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return 'hsla(' + (t * 60) + ',90%,55%,' + alpha + ')';
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case 'rainbow':
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return 'hsla(' + (t * 360) + ',80%,60%,' + alpha + ')';
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default: // neon
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return 'hsla(' + (220 + t * 80) + ',80%,60%,' + alpha + ')';
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}
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}
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function getColorRGB(i, total) {
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var t = i / total;
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switch (colorScheme) {
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case 'ocean':
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return {r: 0, g: Math.floor(128 + t * 127), b: Math.floor(200 + t * 55)};
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case 'fire':
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return {r: Math.floor(200 + t * 55), g: Math.floor(t * 180), b: 0};
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case 'rainbow':
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var h = t * 360, s = 0.8, l = 0.6;
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var c = (1 - Math.abs(2*l - 1)) * s;
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var x = c * (1 - Math.abs((h/60)%2 - 1));
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var m = l - c/2;
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var r=0, g=0, b=0;
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if(h<60){r=c;g=x;}else if(h<120){r=x;g=c;}else if(h<180){g=c;b=x;}
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else if(h<240){g=x;b=c;}else if(h<300){r=x;b=c;}else{r=c;b=x;}
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return {r:Math.floor((r+m)*255), g:Math.floor((g+m)*255), b:Math.floor((b+m)*255)};
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default:
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return {r: Math.floor(80 + t * 100), g: Math.floor(50 + t * 80), b: Math.floor(180 + t * 75)};
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}
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}
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// === Bars ===
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function renderBars(w, h) {
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var count = audioBins.length;
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var barW = (w * 0.85) / count;
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var gap = barW * 0.15;
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var actualW = barW - gap;
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var offsetX = w * 0.075;
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for (var i = 0; i < count; i++) {
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var val = Math.min(1, audioBins[i] * sensitivity);
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if (val < 0.01) continue;
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var barH = val * h * 0.65;
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var x = offsetX + i * barW;
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var y = h - barH;
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var grad = ctx.createLinearGradient(x, y, x, h);
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grad.addColorStop(0, getColor(i, count, 0.95));
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grad.addColorStop(1, getColor(i, count, 0.15));
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ctx.fillStyle = grad;
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ctx.fillRect(x, y, actualW, barH);
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// 顶部高光
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ctx.shadowColor = getColor(i, count, 0.6);
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ctx.shadowBlur = 6;
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ctx.fillRect(x, y, actualW, 2);
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ctx.shadowBlur = 0;
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// 底部反射
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var refGrad = ctx.createLinearGradient(x, h, x, h + barH * 0.3);
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refGrad.addColorStop(0, getColor(i, count, 0.15));
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refGrad.addColorStop(1, 'rgba(0,0,0,0)');
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ctx.fillStyle = refGrad;
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ctx.fillRect(x, h, actualW, barH * 0.3);
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}
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}
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// === Waveform ===
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function renderWaveform(w, h) {
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var count = audioBins.length;
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var midY = h * 0.5;
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var amplitude = h * 0.35 * sensitivity;
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ctx.beginPath();
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ctx.moveTo(0, midY);
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for (var i = 0; i < count; i++) {
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var x = (i / (count - 1)) * w;
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var val = audioBins[i] * amplitude;
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var y = midY - val;
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if (i === 0) {
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ctx.moveTo(x, y);
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} else {
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var prevX = ((i - 1) / (count - 1)) * w;
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var cpx = (prevX + x) / 2;
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ctx.quadraticCurveTo(prevX, midY - audioBins[i-1] * amplitude, cpx, (midY - audioBins[i-1] * amplitude + y) / 2);
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}
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}
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ctx.lineTo(w, midY);
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// 镜像
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ctx.moveTo(0, midY);
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for (var i = 0; i < count; i++) {
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var x = (i / (count - 1)) * w;
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var val = audioBins[i] * amplitude * 0.6;
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var y = midY + val;
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if (i === 0) {
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ctx.lineTo(x, y);
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} else {
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var prevX = ((i - 1) / (count - 1)) * w;
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var cpx = (prevX + x) / 2;
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ctx.quadraticCurveTo(prevX, midY + audioBins[i-1] * amplitude * 0.6, cpx, (midY + audioBins[i-1] * amplitude * 0.6 + y) / 2);
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}
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}
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ctx.lineTo(w, midY);
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ctx.strokeStyle = getColor(Math.floor(count / 2), count, 0.8);
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ctx.lineWidth = 2;
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ctx.shadowColor = getColor(Math.floor(count / 2), count, 0.5);
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ctx.shadowBlur = 12;
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ctx.stroke();
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ctx.shadowBlur = 0;
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// 填充区域
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ctx.lineTo(w, midY);
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ctx.lineTo(0, midY);
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ctx.closePath();
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ctx.fillStyle = getColor(Math.floor(count / 2), count, 0.08);
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ctx.fill();
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}
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// === Circular ===
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function renderCircular(w, h) {
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var cx = w / 2;
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var cy = h / 2;
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var count = audioBins.length;
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var baseR = Math.min(w, h) * 0.15;
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var maxR = Math.min(w, h) * 0.4 * sensitivity;
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for (var i = 0; i < count; i++) {
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var angle = (i / count) * Math.PI * 2 - Math.PI / 2;
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var val = Math.min(1, audioBins[i]);
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var r = baseR + val * maxR;
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var x1 = cx + Math.cos(angle) * baseR;
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var y1 = cy + Math.sin(angle) * baseR;
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var x2 = cx + Math.cos(angle) * r;
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var y2 = cy + Math.sin(angle) * r;
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ctx.beginPath();
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ctx.moveTo(x1, y1);
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ctx.lineTo(x2, y2);
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ctx.strokeStyle = getColor(i, count, 0.7 + val * 0.3);
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ctx.lineWidth = Math.max(1, (Math.PI * 2 * baseR / count) * 0.6);
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ctx.shadowColor = getColor(i, count, 0.4);
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ctx.shadowBlur = val > 0.3 ? 8 : 0;
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ctx.stroke();
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ctx.shadowBlur = 0;
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}
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// 中心光晕
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var avgBin = 0;
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for (var i = 0; i < count; i++) avgBin += audioBins[i];
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avgBin /= count;
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if (avgBin > 0.05) {
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var glowR = baseR * (0.8 + avgBin * 0.5);
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var glow = ctx.createRadialGradient(cx, cy, 0, cx, cy, glowR);
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glow.addColorStop(0, getColor(Math.floor(count/2), count, avgBin * 0.3));
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glow.addColorStop(1, 'rgba(0,0,0,0)');
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ctx.fillStyle = glow;
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ctx.beginPath();
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ctx.arc(cx, cy, glowR, 0, Math.PI * 2);
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ctx.fill();
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}
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}
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// === Idle 呼吸动画 ===
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function renderIdle(w, h, ts) {
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var cx = w / 2;
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var cy = h / 2;
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var t = ts / 1000;
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var breathR = Math.min(w, h) * 0.15 * (1 + 0.15 * Math.sin(t * 0.8));
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var grad = ctx.createRadialGradient(cx, cy, 0, cx, cy, breathR);
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grad.addColorStop(0, getColor(0, 1, 0.15 + 0.05 * Math.sin(t)));
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grad.addColorStop(1, 'rgba(0,0,0,0)');
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ctx.fillStyle = grad;
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ctx.beginPath();
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ctx.arc(cx, cy, breathR, 0, Math.PI * 2);
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ctx.fill();
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// 微弱粒子
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for (var i = 0; i < 6; i++) {
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var angle = (i / 6) * Math.PI * 2 + t * 0.3;
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var dist = breathR * (1.5 + 0.3 * Math.sin(t * 1.2 + i));
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var px = cx + Math.cos(angle) * dist;
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var py = cy + Math.sin(angle) * dist;
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ctx.beginPath();
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ctx.arc(px, py, 2, 0, Math.PI * 2);
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ctx.fillStyle = getColor(i, 6, 0.2 + 0.1 * Math.sin(t + i));
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ctx.fill();
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}
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}
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var FPS = 30, lastFrame = 0;
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function render(ts) {
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requestAnimationFrame(render);
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if (ts - lastFrame < 1000 / FPS) return;
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lastFrame = ts;
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var w = canvas.width, h = canvas.height;
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// 半透明背景实现拖尾效果
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ctx.fillStyle = 'rgba(5, 5, 15, 0.25)';
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ctx.fillRect(0, 0, w, h);
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// 检测空闲
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var binSum = 0;
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for (var i = 0; i < audioBins.length; i++) binSum += audioBins[i];
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if (binSum < 0.5) {
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idleTime++;
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} else {
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idleTime = 0;
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}
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if (idleTime > 60) { // ~2 seconds at 30fps
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renderIdle(w, h, ts);
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return;
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}
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switch (vizStyle) {
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case 'waveform': renderWaveform(w, h); break;
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case 'circular': renderCircular(w, h); break;
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default: renderBars(w, h);
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}
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}
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requestAnimationFrame(render);
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</script>
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