fluid-simulation/index.html at main · alyshukry/fluid-simulation · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <title>Fluid Simulation Sandbox</title>
</head>

<body>
    <style>
        body {
            font-family: monospace;
        }
    </style>

    <h1>Fluid Simulation Sandbox</h1>

    <canvas id="fluid" width="64" height="32"
        style="border: 1px solid black; width:640px; height:320px; image-rendering: pixelated;"></canvas>

    <h2>Controls</h2>

    <div>
        <label>Diffusion: <input type="range" id="diffusion" min="0" max="0.001" step="0.00001" value="0.00001"></label>
        <span id="diffusion-val">0</span>
    </div>

    <div>
        <label>Viscosity: <input type="range" id="viscosity" min="0" max="0.01" step="0.0001" value="0"></label>
        <span id="viscosity-val">0</span>
    </div>

    <div>
        <label>Time Step: <input type="range" id="dt" min="0.1" max="2" step="0.1" value="1"></label>
        <span id="dt-val">1</span>
    </div>

    <div>
        <label>Color Cycle Speed: <input type="range" id="speed" min="0.001" max="0.02" step="0.001" value="0.005"></label>
        <span id="speed-val">0.005</span>
    </div>

    <h2>Canvas Resolution</h2>
    <div>
        <label>Width: <input type="number" id="width" min="16" max="256" value="64" style="width: 80px"></label>
        <label>Height: <input type="number" id="height" min="16" max="128" value="32" style="width: 80px"></label>
        <label>Cell Size: <input type="number" id="cell-size" min="1" max="15" value="10" style="width: 80px"></label>
        <button id="apply-resolution">Apply Resolution</button>
    </div>

    <h2>Ink & Velocity</h2>
    <div>
        <label>Ink Size: <input type="range" id="ink-size" min="1" max="20" step="0.5" value="2"></label>
        <span id="ink-size-val">2</span>
    </div>
    <div>
        <label>Velocity Multiplier: <input type="range" id="velocity-mult" min="0.1" max="5" step="0.1"
                value="1"></label>
        <span id="velocity-mult-val">1</span>
    </div>

    <button id="reset">Reset Fluid</button>

    <h2>Palette Editor</h2>
    <p>Current Palette:</p>
    <div id="palette-list"></div>
    <button id="add-color">Add Color</button>

    <h3>Presets</h3>
    <button id="preset-cmyk">CMYK</button>
    <button id="preset-rainbow">Rainbow</button>
    <button id="preset-fire">Fire</button>
    <button id="preset-ocean">Ocean</button>
    <button id="preset-monochrome">Monochrome</button>

    <script type="module">
        import { Fluid, palette, enableInteraction } from './main.js';

        const canvas = document.getElementById('fluid');
        let fluid = new Fluid(canvas, 0.00001, 0, 1);

        // Make palette accessible
        let currentSpeed = 0.005;
        let inkSize = 2;
        let velocityMult = 1;

        // Update controls display
        const diffusionSlider = document.getElementById('diffusion');
        const viscositySlider = document.getElementById('viscosity');
        const dtSlider = document.getElementById('dt');
        const speedSlider = document.getElementById('speed');

        diffusionSlider.addEventListener('input', e => {
            fluid.diffusion = parseFloat(e.target.value);
            document.getElementById('diffusion-val').textContent = e.target.value;
        });

        viscositySlider.addEventListener('input', e => {
            fluid.viscosity = parseFloat(e.target.value);
            document.getElementById('viscosity-val').textContent = e.target.value;
        });

        dtSlider.addEventListener('input', e => {
            fluid.dt = parseFloat(e.target.value);
            document.getElementById('dt-val').textContent = e.target.value;
        });

        speedSlider.addEventListener('input', e => {
            currentSpeed = parseFloat(e.target.value);
            document.getElementById('speed-val').textContent = e.target.value;
        });

        // Ink and velocity controls
        const inkSizeSlider = document.getElementById('ink-size');
        const velocityMultSlider = document.getElementById('velocity-mult');

        inkSizeSlider.addEventListener('input', e => {
            inkSize = parseFloat(e.target.value);
            document.getElementById('ink-size-val').textContent = e.target.value;
        });

        velocityMultSlider.addEventListener('input', e => {
            velocityMult = parseFloat(e.target.value);
            document.getElementById('velocity-mult-val').textContent = e.target.value;
        });

        // Resolution controls
        document.getElementById('apply-resolution').addEventListener('click', () => {
            const newWidth = parseInt(document.getElementById('width').value);
            const newHeight = parseInt(document.getElementById('height').value);
            const newCellSize = parseInt(document.getElementById('cell-size').value);

            // Stop the old fluid's render loop
            if (fluid.animationId) {
                cancelAnimationFrame(fluid.animationId);
            }
            if (fluid.timeoutId) {
                clearTimeout(fluid.timeoutId);
            }

            canvas.width = newWidth;
            canvas.height = newHeight;
            canvas.style.width = `${newWidth * newCellSize}px`;
            canvas.style.height = `${newHeight * newCellSize}px`;

            // Recreate fluid with new dimensions
            const currentDiffusion = fluid.diffusion;
            const currentViscosity = fluid.viscosity;
            const currentDt = fluid.dt;

            fluid = new Fluid(canvas, currentDiffusion, currentViscosity, currentDt);
            setupInteraction();
        });

        // Reset button
        document.getElementById('reset').addEventListener('click', () => {
            fluid.c.fill(0);
            fluid.c0.fill(0);
            fluid.m.fill(0);
            fluid.m0.fill(0);
            fluid.y.fill(0);
            fluid.y0.fill(0);
            fluid.k.fill(0);
            fluid.k0.fill(0);
            fluid.u.fill(0);
            fluid.u0.fill(0);
            fluid.v.fill(0);
            fluid.v0.fill(0);
        });

        // Palette management
        function renderPalette() {
            const list = document.getElementById('palette-list');
            list.innerHTML = '';
            palette.forEach((color, i) => {
                const div = document.createElement('div');
                div.innerHTML = `
                    Color ${i + 1}:
                    C:<input type="number" min="0" max="255" value="${color[0]}" data-idx="${i}" data-channel="0" style="width: 60px">
                    M:<input type="number" min="0" max="255" value="${color[1]}" data-idx="${i}" data-channel="1" style="width: 60px">
                    Y:<input type="number" min="0" max="255" value="${color[2]}" data-idx="${i}" data-channel="2" style="width: 60px">
                    K:<input type="number" min="0" max="255" value="${color[3]}" data-idx="${i}" data-channel="3" style="width: 60px">
                    <button data-remove="${i}">Remove</button>
                `;
                list.appendChild(div);
            });

            // Add event listeners
            list.querySelectorAll('input[type="number"]').forEach(input => {
                input.addEventListener('change', e => {
                    const idx = parseInt(e.target.dataset.idx);
                    const channel = parseInt(e.target.dataset.channel);
                    palette[idx][channel] = parseInt(e.target.value);
                });
            });

            list.querySelectorAll('button[data-remove]').forEach(btn => {
                btn.addEventListener('click', e => {
                    const idx = parseInt(e.target.dataset.remove);
                    palette.splice(idx, 1);
                    renderPalette();
                });
            });
        }

        document.getElementById('add-color').addEventListener('click', () => {
            palette.push([0, 0, 0, 0]);
            renderPalette();
        });

        // Presets
        document.getElementById('preset-cmyk').addEventListener('click', () => {
            palette.length = 0;
            palette.push([255, 0, 0, 0], [0, 255, 0, 0], [0, 0, 255, 0], [0, 0, 0, 255]);
            renderPalette();
        });

        document.getElementById('preset-rainbow').addEventListener('click', () => {
            palette.length = 0;
            palette.push(
                [255, 0, 0, 0],    // Cyan
                [0, 255, 255, 0],  // Blue
                [0, 255, 0, 0],    // Magenta
                [0, 0, 255, 0],    // Yellow
                [255, 0, 255, 0]   // Green
            );
            renderPalette();
        });

        document.getElementById('preset-fire').addEventListener('click', () => {
            palette.length = 0;
            palette.push(
                [0, 0, 255, 0],    // Yellow
                [0, 100, 255, 0],  // Orange
                [0, 255, 255, 0],  // Red
                [0, 0, 0, 255]     // Black
            );
            renderPalette();
        });

        document.getElementById('preset-ocean').addEventListener('click', () => {
            palette.length = 0;
            palette.push(
                [255, 0, 0, 0],    // Cyan
                [255, 100, 0, 0],  // Light Blue
                [150, 0, 0, 0],    // Lighter Cyan
                [100, 50, 0, 100]  // Deep Blue
            );
            renderPalette();
        });

        document.getElementById('preset-monochrome').addEventListener('click', () => {
            palette.length = 0;
            palette.push(
                [0, 0, 0, 50],
                [0, 0, 0, 150],
                [0, 0, 0, 255]
            );
            renderPalette();
        });

        renderPalette();

        // Modified enableInteraction to use currentSpeed, inkSize, and velocityMult
        function setupInteraction() {
            let prevX = null;
            let prevY = null;
            let t = 0;

            const getPos = e => {
                const rect = canvas.getBoundingClientRect();
                const x = (e.touches ? e.touches[0].clientX : e.clientX) - rect.left;
                const y = (e.touches ? e.touches[0].clientY : e.clientY) - rect.top;
                return {
                    x: x * (fluid.WIDTH / canvas.clientWidth),
                    y: y * (fluid.HEIGHT / canvas.clientHeight)
                };
            };

            function getPaletteColor(t) {
                const p = palette;
                const N = p.length;
                const idx = Math.floor(t) % N;
                const next = (idx + 1) % N;
                const f = t - Math.floor(t);

                const r = Math.round(p[idx][0] + (p[next][0] - p[idx][0]) * f);
                const g = Math.round(p[idx][1] + (p[next][1] - p[idx][1]) * f);
                const b = Math.round(p[idx][2] + (p[next][2] - p[idx][2]) * f);
                const k = Math.round(p[idx][3] + (p[next][3] - p[idx][3]) * f);
                return { r, g, b, k };
            }

            const move = e => {
                const { x, y } = getPos(e);

                if (prevX !== null) {
                    const vx = (x - prevX) * 2 / 50 * velocityMult;
                    const vy = (y - prevY) * 2 / 50 * velocityMult;
                    fluid.injectVelocity(x, y, vx, vy, inkSize);
                }

                t += currentSpeed;
                const { r, g, b, k } = getPaletteColor(t);
                fluid.spawnInk(x, y, inkSize, r, g, b, k);

                prevX = x;
                prevY = y;
            };

            const end = () => {
                prevX = prevY = null;
            };

            // Remove old listeners if they exist
            canvas.removeEventListener("mousemove", move);
            canvas.removeEventListener("touchmove", move);

            canvas.addEventListener("mousemove", move);
            canvas.addEventListener("touchmove", move, { passive: false });
            window.addEventListener("mouseleave", end);
            window.addEventListener("touchend", end);
        }

        setupInteraction();
    </script>
</body>

</html>