Trail

Developer
Hakim El Hattab
Size
2,883 Kb
Views
24,288
  1. Trail Previews
  2. Trail HTML Codes
  3. Trail CSS Codes
  4. Trail JS Codes

How do I make an trail?

A set of rotating particles that leave a silky smooth trail as you move your mouse. One of my first canvas experiments :D. What is a trail? How do you make a trail? This script and codes were developed by Hakim El Hattab on 24 September 2022, Saturday.

Trail Previews
IQ Test

Trail - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Trail</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <canvas id='world'></canvas> <script src="js/index.js"></script>
</body>
</html>

Trail - Script Codes CSS Codes

body { background-color: #000000; padding: 0; margin: 0; overflow: hidden;
}

Trail - Script Codes JS Codes

// One of my first <canvas> experiments, woop! :D
var SCREEN_WIDTH = window.innerWidth;
var SCREEN_HEIGHT = window.innerHeight;
var RADIUS = 70;
var RADIUS_SCALE = 1;
var RADIUS_SCALE_MIN = 1;
var RADIUS_SCALE_MAX = 1.5;
var QUANTITY = 25;
var canvas;
var context;
var particles;
var mouseX = SCREEN_WIDTH * 0.5;
var mouseY = SCREEN_HEIGHT * 0.5;
var mouseIsDown = false;
function init() { canvas = document.getElementById( 'world' ); if (canvas && canvas.getContext) {	context = canvas.getContext('2d');	// Register event listeners	window.addEventListener('mousemove', documentMouseMoveHandler, false);	window.addEventListener('mousedown', documentMouseDownHandler, false);	window.addEventListener('mouseup', documentMouseUpHandler, false);	document.addEventListener('touchstart', documentTouchStartHandler, false);	document.addEventListener('touchmove', documentTouchMoveHandler, false);	window.addEventListener('resize', windowResizeHandler, false);	createParticles();	windowResizeHandler();	setInterval( loop, 1000 / 60 );	}
}
function createParticles() {	particles = [];	for (var i = 0; i < QUANTITY; i++) {	var particle = {	size: 1,	position: { x: mouseX, y: mouseY },	offset: { x: 0, y: 0 },	shift: { x: mouseX, y: mouseY },	speed: 0.01+Math.random()*0.04,	targetSize: 1,	fillColor: '#' + (Math.random() * 0x404040 + 0xaaaaaa | 0).toString(16),	orbit: RADIUS*.5 + (RADIUS * .5 * Math.random())	};	particles.push( particle );	}
}
function documentMouseMoveHandler(event) {	mouseX = event.clientX - (window.innerWidth - SCREEN_WIDTH) * .5;	mouseY = event.clientY - (window.innerHeight - SCREEN_HEIGHT) * .5;
}
function documentMouseDownHandler(event) {	mouseIsDown = true;
}
function documentMouseUpHandler(event) {	mouseIsDown = false;
}
function documentTouchStartHandler(event) {	if(event.touches.length == 1) {	event.preventDefault();	mouseX = event.touches[0].pageX - (window.innerWidth - SCREEN_WIDTH) * .5;;	mouseY = event.touches[0].pageY - (window.innerHeight - SCREEN_HEIGHT) * .5;	}
}
function documentTouchMoveHandler(event) {	if(event.touches.length == 1) {	event.preventDefault();	mouseX = event.touches[0].pageX - (window.innerWidth - SCREEN_WIDTH) * .5;;	mouseY = event.touches[0].pageY - (window.innerHeight - SCREEN_HEIGHT) * .5;	}
}
function windowResizeHandler() {	SCREEN_WIDTH = window.innerWidth;	SCREEN_HEIGHT = window.innerHeight;	canvas.width = SCREEN_WIDTH;	canvas.height = SCREEN_HEIGHT;
}
function loop() {	if( mouseIsDown ) {	RADIUS_SCALE += ( RADIUS_SCALE_MAX - RADIUS_SCALE ) * (0.02);	}	else {	RADIUS_SCALE -= ( RADIUS_SCALE - RADIUS_SCALE_MIN ) * (0.02);	}	RADIUS_SCALE = Math.min( RADIUS_SCALE, RADIUS_SCALE_MAX );	context.fillStyle = 'rgba(0,0,0,0.05)'; context.fillRect(0, 0, context.canvas.width, context.canvas.height);	for (i = 0, len = particles.length; i < len; i++) {	var particle = particles[i];	var lp = { x: particle.position.x, y: particle.position.y };	// Rotation	particle.offset.x += particle.speed;	particle.offset.y += particle.speed;	// Follow mouse with some lag	particle.shift.x += ( mouseX - particle.shift.x) * (particle.speed);	particle.shift.y += ( mouseY - particle.shift.y) * (particle.speed);	// Apply position	particle.position.x = particle.shift.x + Math.cos(i + particle.offset.x) * (particle.orbit*RADIUS_SCALE);	particle.position.y = particle.shift.y + Math.sin(i + particle.offset.y) * (particle.orbit*RADIUS_SCALE);	// Limit to screen bounds	particle.position.x = Math.max( Math.min( particle.position.x, SCREEN_WIDTH ), 0 );	particle.position.y = Math.max( Math.min( particle.position.y, SCREEN_HEIGHT ), 0 );	particle.size += ( particle.targetSize - particle.size ) * 0.05;	if( Math.round( particle.size ) == Math.round( particle.targetSize ) ) {	particle.targetSize = 1 + Math.random() * 7;	}	context.beginPath();	context.fillStyle = particle.fillColor;	context.strokeStyle = particle.fillColor;	context.lineWidth = particle.size;	context.moveTo(lp.x, lp.y);	context.lineTo(particle.position.x, particle.position.y);	context.stroke();	context.arc(particle.position.x, particle.position.y, particle.size/2, 0, Math.PI*2, true);	context.fill();	}
}
window.onload = init;
Trail - Script Codes
Trail - Script Codes
Home Page Home
Developer Hakim El Hattab
Username hakimel
Uploaded September 24, 2022
Rating 4.5
Size 2,883 Kb
Views 24,288
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