Ubuntu
247 lines
8.7 KiB
HTML
247 lines
8.7 KiB
HTML
<!DOCTYPE html>
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<html lang="zh">
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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>02 - Moving Dots | 粒子动起来</title>
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<style>
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* { margin: 0; padding: 0; box-sizing: border-box; }
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body {
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background: #0a0a0a;
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overflow: hidden;
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font-family: 'Space Mono', monospace;
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}
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#canvas-container {
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width: 100vw;
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height: 100vh;
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}
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.info {
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position: fixed;
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top: 20px;
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left: 20px;
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color: #00ff88;
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font-size: 14px;
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pointer-events: none;
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text-shadow: 0 0 10px #00ff88;
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z-index: 100;
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}
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.info h1 { font-size: 18px; margin-bottom: 8px; }
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.info p { opacity: 0.8; font-size: 12px; margin: 4px 0; }
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.controls {
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position: fixed;
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bottom: 20px;
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left: 20px;
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color: #fff;
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font-size: 12px;
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background: rgba(0,0,0,0.5);
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padding: 15px;
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border-radius: 8px;
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border: 1px solid #333;
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}
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.control-group {
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margin: 8px 0;
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display: flex;
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align-items: center;
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gap: 10px;
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}
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.control-group label {
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width: 80px;
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color: #aaa;
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}
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.control-group input[type="range"] {
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width: 150px;
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}
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.control-group span {
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color: #00ff88;
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min-width: 40px;
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}
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</style>
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</head>
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<body>
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<div id="canvas-container"></div>
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<div class="info">
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<h1>02 - Moving Dots</h1>
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<p>每个粒子独立运动</p>
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<p>粒子数: <span id="count">0</span></p>
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<p>FPS: <span id="fps">0</span></p>
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</div>
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<div class="controls">
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<div class="control-group">
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<label>速度</label>
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<input type="range" id="speed" min="0.1" max="3" step="0.1" value="1">
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<span id="speedVal">1.0</span>
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</div>
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<div class="control-group">
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<label>振幅</label>
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<input type="range" id="amp" min="1" max="20" step="1" value="5">
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<span id="ampVal">5</span>
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</div>
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<div class="control-group">
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<label>频率</label>
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<input type="range" id="freq" min="0.1" max="2" step="0.1" value="0.5">
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<span id="freqVal">0.5</span>
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</div>
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</div>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
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<script>
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// 场景设置
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const scene = new THREE.Scene();
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scene.fog = new THREE.FogExp2(0x0a0a0a, 0.01);
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const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
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camera.position.z = 60;
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const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
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renderer.setSize(window.innerWidth, window.innerHeight);
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renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
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document.getElementById('canvas-container').appendChild(renderer.domElement);
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// 粒子参数
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const PARTICLE_COUNT = 2000;
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const geometry = new THREE.BufferGeometry();
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// 存储初始位置和运动参数
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const positions = new Float32Array(PARTICLE_COUNT * 3);
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const initialPositions = new Float32Array(PARTICLE_COUNT * 3);
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const colors = new Float32Array(PARTICLE_COUNT * 3);
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const phases = new Float32Array(PARTICLE_COUNT); // 每个粒子的相位偏移
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const speeds = new Float32Array(PARTICLE_COUNT); // 每个粒子的速度
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// 生成粒子
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for (let i = 0; i < PARTICLE_COUNT; i++) {
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// 初始位置：螺旋分布
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const angle = (i / PARTICLE_COUNT) * Math.PI * 20; // 10圈螺旋
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const radius = 5 + (i / PARTICLE_COUNT) * 25;
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const height = (Math.random() - 0.5) * 20;
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const x = Math.cos(angle) * radius;
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const y = height;
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const z = Math.sin(angle) * radius;
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positions[i * 3] = x;
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positions[i * 3 + 1] = y;
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positions[i * 3 + 2] = z;
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initialPositions[i * 3] = x;
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initialPositions[i * 3 + 1] = y;
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initialPositions[i * 3 + 2] = z;
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// 颜色：根据半径渐变（蓝→青→绿→黄）
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const hue = 0.5 + (radius / 30) * 0.3; // 0.5(青) ~ 0.8(黄)
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const color = new THREE.Color().setHSL(hue, 0.9, 0.5);
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colors[i * 3] = color.r;
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colors[i * 3 + 1] = color.g;
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colors[i * 3 + 2] = color.b;
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// 每个粒子独特的运动参数
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phases[i] = Math.random() * Math.PI * 2;
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speeds[i] = 0.5 + Math.random() * 1.5;
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}
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geometry.setAttribute('position', new THREE.BufferAttribute(positions, 3));
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geometry.setAttribute('color', new THREE.BufferAttribute(colors, 3));
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// 粒子材质
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const material = new THREE.PointsMaterial({
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size: 0.8,
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vertexColors: true,
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transparent: true,
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opacity: 0.9,
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sizeAttenuation: true,
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blending: THREE.AdditiveBlending
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});
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const particles = new THREE.Points(geometry, material);
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scene.add(particles);
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// UI 控制
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const speedSlider = document.getElementById('speed');
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const ampSlider = document.getElementById('amp');
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const freqSlider = document.getElementById('freq');
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const speedVal = document.getElementById('speedVal');
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const ampVal = document.getElementById('ampVal');
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const freqVal = document.getElementById('freqVal');
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speedSlider.addEventListener('input', (e) => speedVal.textContent = e.target.value);
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ampSlider.addEventListener('input', (e) => ampVal.textContent = e.target.value);
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freqSlider.addEventListener('input', (e) => freqVal.textContent = e.target.value);
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// 更新计数
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document.getElementById('count').textContent = PARTICLE_COUNT;
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// FPS 计算
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let lastTime = performance.now();
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let frameCount = 0;
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const fpsEl = document.getElementById('fps');
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// 动画循环
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let time = 0;
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function animate() {
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requestAnimationFrame(animate);
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const now = performance.now();
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frameCount++;
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if (now - lastTime >= 1000) {
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fpsEl.textContent = frameCount;
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frameCount = 0;
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lastTime = now;
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}
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// 获取控制值
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const globalSpeed = parseFloat(speedSlider.value);
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const amplitude = parseFloat(ampSlider.value);
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const frequency = parseFloat(freqSlider.value);
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time += 0.01 * globalSpeed;
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const positions = geometry.attributes.position.array;
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// 更新每个粒子位置（核心算法）
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for (let i = 0; i < PARTICLE_COUNT; i++) {
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const ix = i * 3;
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const iy = i * 3 + 1;
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const iz = i * 3 + 2;
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const initX = initialPositions[ix];
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const initY = initialPositions[iy];
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const initZ = initialPositions[iz];
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// 波浪运动：基于时间和相位的正弦波
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const wave1 = Math.sin(time * speeds[i] + phases[i]) * amplitude;
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const wave2 = Math.cos(time * speeds[i] * frequency + phases[i]) * amplitude * 0.5;
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// 垂直波动
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positions[iy] = initY + wave1;
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// 径向波动
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const angle = Math.atan2(initZ, initX);
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const radius = Math.sqrt(initX * initX + initZ * initZ);
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const newRadius = radius + wave2;
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positions[ix] = Math.cos(angle) * newRadius;
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positions[iz] = Math.sin(angle) * newRadius;
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}
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// 标记位置属性需要更新
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geometry.attributes.position.needsUpdate = true;
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// 整体缓慢旋转
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particles.rotation.y = time * 0.1;
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renderer.render(scene, camera);
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}
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animate();
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// 响应窗口调整
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window.addEventListener('resize', () => {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize(window.innerWidth, window.innerHeight);
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});
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</script>
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</body>
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</html>
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