goldenratio/particle_system.js

## particle_system.js
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Particle System</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            background-color: #1a1a1a;
            color: #fff;
            font-family: 'Inter', sans-serif;
        }

        canvas {
            display: block;
            background: #000;
        }

        .info {
            position: fixed;
            top: 10px;
            left: 10px;
            background: rgba(0, 0, 0, 0.5);
            padding: 10px;
            border-radius: 8px;
            font-size: 14px;
        }
    </style>
</head>
<body>
    <div class="info">
        <p>Particles: <span id="particleCount">0</span></p>
        <p>Click and hold to generate more particles.</p>
    </div>
    <canvas id="particleCanvas"></canvas>

    <script>
        const canvas = document.getElementById('particleCanvas');
        const ctx = canvas.getContext('2d');
        const particleCountElement = document.getElementById('particleCount');

        let particles = [];
        let mouse = { x: null, y: null, isDown: false };
        let hue = 0;

        // Set canvas size to full window
        function setCanvasSize() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;
        }
        setCanvasSize();

        // Event listeners for window and mouse
        window.addEventListener('resize', setCanvasSize);
        window.addEventListener('mousemove', (event) => {
            mouse.x = event.x;
            mouse.y = event.y;
        });
        window.addEventListener('mousedown', () => {
            mouse.isDown = true;
        });
        window.addEventListener('mouseup', () => {
            mouse.isDown = false;
        });

        class Particle {
            constructor(x, y) {
                this.x = x;
                this.y = y;
                this.size = Math.random() * 5 + 1;
                this.speedX = Math.random() * 3 - 1.5;
                this.speedY = Math.random() * 3 - 1.5;
                this.color = `hsl(${hue}, 100%, 50%)`;
            }

            update() {
                this.x += this.speedX;
                this.y += this.speedY;
                if (this.size > 0.2) this.size -= 0.1;
            }

            draw() {
                ctx.fillStyle = this.color;
                ctx.beginPath();
                ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
                ctx.fill();
            }
        }

        function handleParticles() {
            for (let i = 0; i < particles.length; i++) {
                particles[i].update();
                particles[i].draw();

                // Remove particles that are too small
                if (particles[i].size <= 0.2) {
                    particles.splice(i, 1);
                    i--;
                }
            }
        }

        function createParticles(count, x, y) {
            for (let i = 0; i < count; i++) {
                particles.push(new Particle(x, y));
            }
        }

        function animate() {
            ctx.fillStyle = 'rgba(0, 0, 0, 0.1)';
            ctx.fillRect(0, 0, canvas.width, canvas.height);
            handleParticles();

            if (mouse.isDown) {
                createParticles(2, mouse.x, mouse.y);
                hue = (hue + 1) % 360;
            }

            particleCountElement.textContent = particles.length;
            requestAnimationFrame(animate);
        }

        // Initial particle creation
        createParticles(100, canvas.width / 2, canvas.height / 2);

        window.onload = function() {
            animate();
        };

    </script>
</body>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Particle System</title>
	<style>
	body {
	margin: 0;
	overflow: hidden;
	background-color: #1a1a1a;
	color: #fff;
	font-family: 'Inter', sans-serif;
	}

	canvas {
	display: block;
	background: #000;
	}

	.info {
	position: fixed;
	top: 10px;
	left: 10px;
	background: rgba(0, 0, 0, 0.5);
	padding: 10px;
	border-radius: 8px;
	font-size: 14px;
	}
	</style>
	</head>
	<body>
	<div class="info">
	<p>Particles: <span id="particleCount">0</span></p>
	<p>Click and hold to generate more particles.</p>
	</div>
	<canvas id="particleCanvas"></canvas>

	<script>
	const canvas = document.getElementById('particleCanvas');
	const ctx = canvas.getContext('2d');
	const particleCountElement = document.getElementById('particleCount');

	let particles = [];
	let mouse = { x: null, y: null, isDown: false };
	let hue = 0;

	// Set canvas size to full window
	function setCanvasSize() {
	canvas.width = window.innerWidth;
	canvas.height = window.innerHeight;
	}
	setCanvasSize();

	// Event listeners for window and mouse
	window.addEventListener('resize', setCanvasSize);
	window.addEventListener('mousemove', (event) => {
	mouse.x = event.x;
	mouse.y = event.y;
	});
	window.addEventListener('mousedown', () => {
	mouse.isDown = true;
	});
	window.addEventListener('mouseup', () => {
	mouse.isDown = false;
	});

	class Particle {
	constructor(x, y) {
	this.x = x;
	this.y = y;
	this.size = Math.random() * 5 + 1;
	this.speedX = Math.random() * 3 - 1.5;
	this.speedY = Math.random() * 3 - 1.5;
	this.color = `hsl(${hue}, 100%, 50%)`;
	}

	update() {
	this.x += this.speedX;
	this.y += this.speedY;
	if (this.size > 0.2) this.size -= 0.1;
	}

	draw() {
	ctx.fillStyle = this.color;
	ctx.beginPath();
	ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
	ctx.fill();
	}
	}

	function handleParticles() {
	for (let i = 0; i < particles.length; i++) {
	particles[i].update();
	particles[i].draw();

	// Remove particles that are too small
	if (particles[i].size <= 0.2) {
	particles.splice(i, 1);
	i--;
	}
	}
	}

	function createParticles(count, x, y) {
	for (let i = 0; i < count; i++) {
	particles.push(new Particle(x, y));
	}
	}

	function animate() {
	ctx.fillStyle = 'rgba(0, 0, 0, 0.1)';
	ctx.fillRect(0, 0, canvas.width, canvas.height);
	handleParticles();

	if (mouse.isDown) {
	createParticles(2, mouse.x, mouse.y);
	hue = (hue + 1) % 360;
	}

	particleCountElement.textContent = particles.length;
	requestAnimationFrame(animate);
	}

	// Initial particle creation
	createParticles(100, canvas.width / 2, canvas.height / 2);

	window.onload = function() {
	animate();
	};

	</script>
	</body>
	</html>
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