aurora-animations/ai-fluid-simulation-202603260402.html at master · robertsong2000/aurora-animations · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>流体模拟 - Fluid Simulation</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            overflow: hidden;
            background: #000;
            font-family: 'Segoe UI', Arial, sans-serif;
        }

        canvas {
            display: block;
            cursor: crosshair;
        }

        .info {
            position: fixed;
            top: 20px;
            left: 20px;
            color: rgba(255, 255, 255, 0.8);
            font-size: 14px;
            z-index: 100;
            background: rgba(0, 0, 0, 0.5);
            padding: 15px 20px;
            border-radius: 10px;
            backdrop-filter: blur(10px);
            max-width: 300px;
        }

        .info h1 {
            font-size: 24px;
            margin-bottom: 10px;
            background: linear-gradient(90deg, #00f5ff, #ff00ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .info p {
            margin: 5px 0;
            line-height: 1.5;
        }

        .controls {
            position: fixed;
            bottom: 20px;
            left: 20px;
            z-index: 100;
            display: flex;
            gap: 10px;
        }

        .controls button {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.3);
            color: white;
            padding: 10px 20px;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s;
            backdrop-filter: blur(10px);
        }

        .controls button:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }

        .stats {
            position: fixed;
            top: 20px;
            right: 20px;
            color: rgba(255, 255, 255, 0.6);
            font-size: 12px;
            z-index: 100;
            background: rgba(0, 0, 0, 0.5);
            padding: 10px 15px;
            border-radius: 5px;
            backdrop-filter: blur(10px);
        }
    </style>
</head>
<body>
    <canvas id="canvas"></canvas>

    <div class="info">
        <h1>🌊 流体模拟</h1>
        <p><strong>交互方式：</strong></p>
        <p>• 鼠标移动：产生流体流动</p>
        <p>• 点击拖动：增加流体密度</p>
        <p>• 右键点击：清除流体</p>
        <p>• 滚轮：调整流体粘度</p>
    </div>

    <div class="controls">
        <button onclick="clearFluid()">清除流体</button>
        <button onclick="toggleRain()">切换降雨</button>
        <button onclick="randomColor()">随机颜色</button>
    </div>

    <div class="stats">
        <div>FPS: <span id="fps">0</span></div>
        <div>粒子数: <span id="particles">0</span></div>
        <div>粘度: <span id="viscosity">0.000</span></div>
    </div>

    <script>
        // Canvas 设置
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');

        // 流体参数
        const SCALE = 4; // 分辨率缩放
        let cols, rows;
        let viscosity = 0.000; // 粘度
        let diffusion = 0.000; // 扩散系数

        // 流体场
        let velocityX, velocityY, density;
        let velocityX0, velocityY0, density0;

        // 粒子系统
        let particles = [];
        const MAX_PARTICLES = 2000;

        // 交互状态
        let mouseX = 0, mouseY = 0;
        let pmouseX = 0, pmouseY = 0;
        let isMouseDown = false;
        let isRainEnabled = false;
        let hueOffset = 0;

        // 性能监控
        let lastTime = performance.now();
        let frameCount = 0;
        let fps = 0;

        // 初始化
        function init() {
            resize();

            // 初始化流体场
            cols = Math.floor(canvas.width / SCALE);
            rows = Math.floor(canvas.height / SCALE);

            const size = cols * rows;
            velocityX = new Float32Array(size);
            velocityY = new Float32Array(size);
            density = new Float32Array(size);
            velocityX0 = new Float32Array(size);
            velocityY0 = new Float32Array(size);
            density0 = new Float32Array(size);

            // 初始化粒子
            for (let i = 0; i < MAX_PARTICLES; i++) {
                particles.push({
                    x: Math.random() * canvas.width,
                    y: Math.random() * canvas.height,
                    vx: 0,
                    vy: 0,
                    life: Math.random() * 100
                });
            }

            // 事件监听
            window.addEventListener('resize', resize);
            canvas.addEventListener('mousemove', mouseMoved);
            canvas.addEventListener('mousedown', mousePressed);
            canvas.addEventListener('mouseup', mouseReleased);
            canvas.addEventListener('contextmenu', rightClick);
            canvas.addEventListener('wheel', wheel);
            canvas.addEventListener('touchstart', touchStart);
            canvas.addEventListener('touchmove', touchMove);
            canvas.addEventListener('touchend', touchEnd);

            // 开始动画
            animate();
        }

        // 调整大小
        function resize() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;

            // 重新初始化流体场
            const newCols = Math.floor(canvas.width / SCALE);
            const newRows = Math.floor(canvas.height / SCALE);
            const newSize = newCols * newRows;

            const newVelocityX = new Float32Array(newSize);
            const newVelocityY = new Float32Array(newSize);
            const newDensity = new Float32Array(newSize);

            // 复制旧数据
            if (cols && rows) {
                for (let i = 0; i < Math.min(rows, newRows); i++) {
                    for (let j = 0; j < Math.min(cols, newCols); j++) {
                        const oldIdx = i * cols + j;
                        const newIdx = i * newCols + j;
                        newVelocityX[newIdx] = velocityX[oldIdx];
                        newVelocityY[newIdx] = velocityY[oldIdx];
                        newDensity[newIdx] = density[oldIdx];
                    }
                }
            }

            cols = newCols;
            rows = newRows;
            velocityX = newVelocityX;
            velocityY = newVelocityY;
            density = newDensity;
            velocityX0 = new Float32Array(newSize);
            velocityY0 = new Float32Array(newSize);
            density0 = new Float32Array(newSize);
        }

        // 索引转换
        function IX(x, y) {
            x = Math.max(0, Math.min(cols - 1, x));
            y = Math.max(0, Math.min(rows - 1, y));
            return y * cols + x;
        }

        // 添加流体
        function addDensity(x, y, amount) {
            const i = Math.floor(x / SCALE);
            const j = Math.floor(y / SCALE);
            density[IX(i, j)] += amount;
        }

        function addVelocity(x, y, amountX, amountY) {
            const i = Math.floor(x / SCALE);
            const j = Math.floor(y / SCALE);
            const idx = IX(i, j);
            velocityX[idx] += amountX;
            velocityY[idx] += amountY;
        }

        // 扩散
        function diffuse(b, x, x0, diff, dt) {
            const a = dt * diff * (cols - 2) * (rows - 2);
            linearSolve(b, x, x0, a, 1 + 6 * a);
        }

        // 线性求解
        function linearSolve(b, x, x0, a, c) {
            const cRecip = 1.0 / c;
            for (let k = 0; k < 4; k++) {
                for (let j = 1; j < rows - 1; j++) {
                    for (let i = 1; i < cols - 1; i++) {
                        x[IX(i, j)] = (x0[IX(i, j)] + a * (
                            x[IX(i + 1, j)] + x[IX(i - 1, j)] +
                            x[IX(i, j + 1)] + x[IX(i, j - 1)]
                        )) * cRecip;
                    }
                }
                setBoundary(b, x);
            }
        }

        // 投影
        function project(velocX, velocY, p, div) {
            for (let j = 1; j < rows - 1; j++) {
                for (let i = 1; i < cols - 1; i++) {
                    div[IX(i, j)] = -0.5 * (
                        velocX[IX(i + 1, j)] - velocX[IX(i - 1, j)] +
                        velocY[IX(i, j + 1)] - velocY[IX(i, j - 1)]
                    ) / SCALE;
                    p[IX(i, j)] = 0;
                }
            }

            setBoundary(0, div);
            setBoundary(0, p);
            linearSolve(0, p, div, 1, 6);

            for (let j = 1; j < rows - 1; j++) {
                for (let i = 1; i < cols - 1; i++) {
                    velocX[IX(i, j)] -= 0.5 * (p[IX(i + 1, j)] - p[IX(i - 1, j)]) * SCALE;
                    velocY[IX(i, j)] -= 0.5 * (p[IX(i, j + 1)] - p[IX(i, j - 1)]) * SCALE;
                }
            }

            setBoundary(1, velocX);
            setBoundary(2, velocY);
        }

        // 对流
        function advect(b, d, d0, velocX, velocY, dt) {
            const dtx = dt * (cols - 2);
            const dty = dt * (rows - 2);

            for (let j = 1; j < rows - 1; j++) {
                for (let i = 1; i < cols - 1; i++) {
                    let x = i - dtx * velocX[IX(i, j)];
                    let y = j - dty * velocY[IX(i, j)];

                    x = Math.max(0.5, Math.min(cols - 1.5, x));
                    y = Math.max(0.5, Math.min(rows - 1.5, y));

                    const i0 = Math.floor(x);
                    const i1 = i0 + 1;
                    const j0 = Math.floor(y);
                    const j1 = j0 + 1;

                    const s1 = x - i0;
                    const s0 = 1 - s1;
                    const t1 = y - j0;
                    const t0 = 1 - t1;

                    d[IX(i, j)] = s0 * (t0 * d0[IX(i0, j0)] + t1 * d0[IX(i0, j1)]) +
                                  s1 * (t0 * d0[IX(i1, j0)] + t1 * d0[IX(i1, j1)]);
                }
            }

            setBoundary(b, d);
        }

        // 设置边界
        function setBoundary(b, x) {
            for (let i = 1; i < cols - 1; i++) {
                x[IX(i, 0)] = b === 2 ? -x[IX(i, 1)] : x[IX(i, 1)];
                x[IX(i, rows - 1)] = b === 2 ? -x[IX(i, rows - 2)] : x[IX(i, rows - 2)];
            }

            for (let j = 1; j < rows - 1; j++) {
                x[IX(0, j)] = b === 1 ? -x[IX(1, j)] : x[IX(1, j)];
                x[IX(cols - 1, j)] = b === 1 ? -x[IX(cols - 2, j)] : x[IX(cols - 2, j)];
            }

            x[IX(0, 0)] = 0.5 * (x[IX(1, 0)] + x[IX(0, 1)]);
            x[IX(0, rows - 1)] = 0.5 * (x[IX(1, rows - 1)] + x[IX(0, rows - 2)]);
            x[IX(cols - 1, 0)] = 0.5 * (x[IX(cols - 2, 0)] + x[IX(cols - 1, 1)]);
            x[IX(cols - 1, rows - 1)] = 0.5 * (x[IX(cols - 2, rows - 1)] + x[IX(cols - 1, rows - 2)]);
        }

        // 流体步进
        function step() {
            const dt = 0.2;

            // 扩散速度
            diffuse(1, velocityX0, velocityX, viscosity, dt);
            diffuse(2, velocityY0, velocityY, viscosity, dt);

            // 投影
            project(velocityX0, velocityY0, velocityX, velocityY);

            // 对流速度
            advect(1, velocityX, velocityX0, velocityX0, velocityY0, dt);
            advect(2, velocityY, velocityY0, velocityX0, velocityY0, dt);

            // 投影
            project(velocityX, velocityY, velocityX0, velocityY0);

            // 扩散密度
            diffuse(0, density0, density, diffusion, dt);

            // 对流密度
            advect(0, density, density0, velocityX, velocityY, dt);

            // 衰减
            for (let i = 0; i < density.length; i++) {
                density[i] *= 0.99;
            }
        }

        // 更新粒子
        function updateParticles() {
            for (let particle of particles) {
                const i = Math.floor(particle.x / SCALE);
                const j = Math.floor(particle.y / SCALE);
                const idx = IX(i, j);

                // 跟随流体
                particle.vx = velocityX[idx] * 10;
                particle.vy = velocityY[idx] * 10;

                particle.x += particle.vx;
                particle.y += particle.vy;

                // 生命周期
                particle.life -= 0.5;

                // 边界检测
                if (particle.x < 0 || particle.x > canvas.width ||
                    particle.y < 0 || particle.y > canvas.height ||
                    particle.life <= 0) {
                    particle.x = Math.random() * canvas.width;
                    particle.y = Math.random() * canvas.height;
                    particle.vx = 0;
                    particle.vy = 0;
                    particle.life = 100 + Math.random() * 100;
                }
            }
        }

        // 绘制
        function draw() {
            // 清除背景
            ctx.fillStyle = 'rgba(0, 0, 0, 0.1)';
            ctx.fillRect(0, 0, canvas.width, canvas.height);

            // 绘制流体密度场
            for (let i = 0; i < cols; i++) {
                for (let j = 0; j < rows; j++) {
                    const d = density[IX(i, j)];
                    if (d > 0.01) {
                        const hue = (hueOffset + d * 10) % 360;
                        const alpha = Math.min(d, 1);
                        ctx.fillStyle = `hsla(${hue}, 80%, 60%, ${alpha})`;
                        ctx.fillRect(i * SCALE, j * SCALE, SCALE, SCALE);
                    }
                }
            }

            // 绘制粒子
            ctx.fillStyle = 'rgba(255, 255, 255, 0.8)';
            for (let particle of particles) {
                const alpha = particle.life / 200;
                ctx.globalAlpha = alpha;
                ctx.beginPath();
                ctx.arc(particle.x, particle.y, 1.5, 0, Math.PI * 2);
                ctx.fill();
            }
            ctx.globalAlpha = 1;
        }

        // 降雨效果
        function rain() {
            if (!isRainEnabled) return;

            const x = Math.random() * canvas.width;
            const y = 0;
            addDensity(x, y, 500);
            addVelocity(x, y, 0, 50);
        }

        // 动画循环
        function animate() {
            // 性能监控
            frameCount++;
            const currentTime = performance.now();
            if (currentTime - lastTime >= 1000) {
                fps = frameCount;
                frameCount = 0;
                lastTime = currentTime;
                document.getElementById('fps').textContent = fps;
                document.getElementById('particles').textContent = particles.length;
                document.getElementById('viscosity').textContent = viscosity.toFixed(3);
            }

            // 添加鼠标交互
            if (isMouseDown) {
                addDensity(mouseX, mouseY, 1000);
            }

            const dx = mouseX - pmouseX;
            const dy = mouseY - pmouseY;
            addVelocity(mouseX, mouseY, dx, dy);

            // 降雨
            rain();

            // 更新
            step();
            updateParticles();

            // 绘制
            draw();

            // 更新上一帧鼠标位置
            pmouseX = mouseX;
            pmouseY = mouseY;

            // 颜色偏移
            hueOffset = (hueOffset + 0.5) % 360;

            requestAnimationFrame(animate);
        }

        // 事件处理
        function mouseMoved(e) {
            pmouseX = mouseX;
            pmouseY = mouseY;
            mouseX = e.clientX;
            mouseY = e.clientY;
        }

        function mousePressed(e) {
            isMouseDown = true;
            mouseX = e.clientX;
            mouseY = e.clientY;
        }

        function mouseReleased() {
            isMouseDown = false;
        }

        function rightClick(e) {
            e.preventDefault();
            clearFluid();
        }

        function wheel(e) {
            e.preventDefault();
            viscosity += e.deltaY * 0.0001;
            viscosity = Math.max(0, Math.min(0.1, viscosity));
        }

        function touchStart(e) {
            e.preventDefault();
            const touch = e.touches[0];
            mouseX = touch.clientX;
            mouseY = touch.clientY;
            isMouseDown = true;
        }

        function touchMove(e) {
            e.preventDefault();
            const touch = e.touches[0];
            pmouseX = mouseX;
            pmouseY = mouseY;
            mouseX = touch.clientX;
            mouseY = touch.clientY;
        }

        function touchEnd() {
            isMouseDown = false;
        }

        // 控制函数
        function clearFluid() {
            density.fill(0);
            velocityX.fill(0);
            velocityY.fill(0);
        }

        function toggleRain() {
            isRainEnabled = !isRainEnabled;
        }

        function randomColor() {
            hueOffset = Math.random() * 360;
        }

        // 启动
        init();
    </script>
</body>
</html>