PhizzySim/simple-optics-test.html at main · PhysicistJohn/PhizzySim · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Optics Test</title>
    <style>
        body {
            margin: 0;
            background: #000;
            color: white;
            font-family: Arial, sans-serif;
        }
        canvas {
            display: block;
            background: #111;
        }
        .controls {
            position: absolute;
            top: 10px;
            left: 10px;
            background: rgba(0,0,0,0.8);
            padding: 10px;
            border-radius: 5px;
        }
        button {
            margin: 5px;
            padding: 5px 10px;
        }
        #status {
            position: absolute;
            bottom: 10px;
            left: 10px;
            background: rgba(0,0,0,0.8);
            padding: 10px;
            border-radius: 5px;
        }
    </style>
</head>
<body>
    <canvas id="canvas"></canvas>
    <div class="controls">
        <button onclick="optics.addLaser()">Add Laser</button>
        <button onclick="optics.addPrism()">Add Prism</button>
        <button onclick="optics.clearAll()">Clear</button>
        <div>
            Wavelength: <input type="range" id="wavelength" min="400" max="700" value="550" oninput="optics.setWavelength(this.value)">
            <span id="wavelengthValue">550</span> nm
        </div>
    </div>
    <div id="status">Click "Add Laser" then "Add Prism" to see dispersion</div>

    <script>
        class SimpleOptics {
            constructor() {
                this.canvas = document.getElementById('canvas');
                this.ctx = this.canvas.getContext('2d');
                this.canvas.width = window.innerWidth;
                this.canvas.height = window.innerHeight;

                this.laser = null;
                this.prism = null;
                this.wavelength = 550;
                this.rays = [];

                console.log('SimpleOptics initialized');
                this.animate();
            }

            addLaser() {
                this.laser = {
                    x: 100,
                    y: this.canvas.height / 2,
                    angle: 0
                };
                console.log('Laser added at', this.laser);
                this.updateStatus('Laser added. Now add a prism.');
                this.calculateRays();
            }

            addPrism() {
                this.prism = {
                    x: this.canvas.width / 2,
                    y: this.canvas.height / 2,
                    size: 100
                };
                console.log('Prism added at', this.prism);
                this.updateStatus('Prism added. You should see dispersion!');
                this.calculateRays();
            }

            setWavelength(value) {
                this.wavelength = parseInt(value);
                document.getElementById('wavelengthValue').textContent = value;
                this.calculateRays();
            }

            clearAll() {
                this.laser = null;
                this.prism = null;
                this.rays = [];
                this.updateStatus('Cleared. Add laser and prism again.');
            }

            calculateRays() {
                this.rays = [];

                if (!this.laser || !this.prism) {
                    console.log('Need both laser and prism');
                    return;
                }

                // Create rays for different wavelengths to show dispersion
                const wavelengths = [400, 450, 500, 550, 600, 650, 700];

                wavelengths.forEach(wavelength => {
                    // Simple ray from laser to prism
                    const ray = {
                        wavelength: wavelength,
                        color: this.wavelengthToColor(wavelength),
                        path: []
                    };

                    // Start from laser
                    ray.path.push({ x: this.laser.x, y: this.laser.y });

                    // Hit prism left face
                    const prismLeftX = this.prism.x - this.prism.size / 2;
                    ray.path.push({ x: prismLeftX, y: this.prism.y });

                    // Calculate refraction angle based on wavelength
                    // Simplified: more refraction for shorter wavelengths
                    const n = 1.5 + (700 - wavelength) * 0.0001; // Simple dispersion model
                    const deviation = (n - 1) * 0.5; // Simplified deviation

                    // Exit prism with wavelength-dependent angle
                    const exitX = this.prism.x + this.prism.size / 2;
                    const exitY = this.prism.y + (wavelength - 550) * 0.2; // Spread by wavelength
                    ray.path.push({ x: exitX, y: exitY });

                    // Continue after prism
                    const finalAngle = (wavelength - 550) * 0.001; // Dispersion angle
                    const finalX = this.canvas.width - 50;
                    const finalY = exitY + (finalX - exitX) * Math.tan(finalAngle);
                    ray.path.push({ x: finalX, y: finalY });

                    this.rays.push(ray);
                });

                console.log('Calculated', this.rays.length, 'rays');
            }

            wavelengthToColor(wavelength) {
                if (wavelength < 450) return '#8B00FF'; // Violet
                if (wavelength < 485) return '#0000FF'; // Blue
                if (wavelength < 500) return '#00FFFF'; // Cyan
                if (wavelength < 565) return '#00FF00'; // Green
                if (wavelength < 590) return '#FFFF00'; // Yellow
                if (wavelength < 625) return '#FF7F00'; // Orange
                return '#FF0000'; // Red
            }

            updateStatus(msg) {
                document.getElementById('status').textContent = msg;
            }

            render() {
                // Clear
                this.ctx.fillStyle = '#111';
                this.ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);

                // Draw laser
                if (this.laser) {
                    this.ctx.fillStyle = '#ff0000';
                    this.ctx.fillRect(this.laser.x - 30, this.laser.y - 15, 60, 30);
                    this.ctx.fillStyle = '#fff';
                    this.ctx.font = '12px Arial';
                    this.ctx.fillText('LASER', this.laser.x - 20, this.laser.y + 4);
                }

                // Draw prism
                if (this.prism) {
                    this.ctx.strokeStyle = '#00ffff';
                    this.ctx.lineWidth = 2;
                    this.ctx.beginPath();
                    // Equilateral triangle
                    const h = this.prism.size * Math.sqrt(3) / 2;
                    this.ctx.moveTo(this.prism.x, this.prism.y - h/2);
                    this.ctx.lineTo(this.prism.x - this.prism.size/2, this.prism.y + h/2);
                    this.ctx.lineTo(this.prism.x + this.prism.size/2, this.prism.y + h/2);
                    this.ctx.closePath();
                    this.ctx.stroke();

                    // Fill with transparency
                    this.ctx.fillStyle = 'rgba(0, 255, 255, 0.1)';
                    this.ctx.fill();
                }

                // Draw rays
                this.rays.forEach(ray => {
                    this.ctx.strokeStyle = ray.color;
                    this.ctx.lineWidth = 2;
                    this.ctx.shadowBlur = 10;
                    this.ctx.shadowColor = ray.color;

                    this.ctx.beginPath();
                    ray.path.forEach((point, i) => {
                        if (i === 0) {
                            this.ctx.moveTo(point.x, point.y);
                        } else {
                            this.ctx.lineTo(point.x, point.y);
                        }
                    });
                    this.ctx.stroke();

                    this.ctx.shadowBlur = 0;
                });

                // Draw wavelength indicator
                if (this.rays.length > 0) {
                    const selectedRay = this.rays.find(r => Math.abs(r.wavelength - this.wavelength) < 25);
                    if (selectedRay) {
                        this.ctx.strokeStyle = '#fff';
                        this.ctx.lineWidth = 4;
                        this.ctx.globalAlpha = 0.5;
                        this.ctx.beginPath();
                        selectedRay.path.forEach((point, i) => {
                            if (i === 0) {
                                this.ctx.moveTo(point.x, point.y);
                            } else {
                                this.ctx.lineTo(point.x, point.y);
                            }
                        });
                        this.ctx.stroke();
                        this.ctx.globalAlpha = 1;
                    }
                }
            }

            animate() {
                this.render();
                requestAnimationFrame(() => this.animate());
            }
        }

        const optics = new SimpleOptics();
    </script>
</body>
</html>