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interactive_bg.html
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interactive_bg.html
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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>Interactive Background</title>
<style>
body {
margin: 0;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
/**
* Interactive Background in plain Javascript
*
* Author: Carlos E. Torres
* E-mail: cetorres@cetorres.com
* Github: https://github.com/cetorres
*/
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var maxRadius = 40;
var mouse = {
x: undefined,
y: undefined
};
window.addEventListener('mousemove', function (event) {
mouse.x = event.x;
mouse.y = event.y;
});
window.addEventListener('resize', function () {
init();
});
var circles = [];
var colors = [
'#9C59B7',
'#2ECC72',
'#17BD9D',
'#3499DC',
'#34495E'
];
init();
animate();
function init() {
canvas.width = innerWidth;
canvas.height = innerHeight;
circles = [];
for (var i = 0; i < 800; i++) {
var radius = random(2, 8);
var x = Math.random() * (canvas.width - radius * 2) + radius;
var y = Math.random() * (canvas.height - radius * 2) + radius;
var dx = (Math.random() - 0.5);
var dy = (Math.random() - 0.5);
circles.push(new Circle(x, y, dx, dy, radius));
}
}
function animate() {
requestAnimationFrame(animate);
ctx.clearRect(0, 0, canvas.width, canvas.height);
for (var i = 0; i < circles.length; i++) {
circles[i].update();
}
}
function Circle(x, y, dx, dy, radius) {
this.x = x;
this.y = y;
this.dx = dx;
this.dy = dy;
this.radius = radius;
this.minRadius = radius;
this.color = colors[Math.floor(Math.random() * colors.length)];
this.draw = function () {
ctx.beginPath();
ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
ctx.strokeStyle = 'blue';
ctx.stroke();
ctx.fillStyle = this.color;
ctx.fill();
}
this.update = function () {
if (this.x + this.radius > canvas.width || this.x - this.radius < 0) {
this.dx = -this.dx;
}
if (this.y + this.radius > canvas.height || this.y - this.radius < 0) {
this.dy = -this.dy;
}
this.x += this.dx;
this.y += this.dy;
if (mouse.x - this.x < 50 && mouse.x - this.x > -50 &&
mouse.y - this.y < 50 && mouse.y - this.y > -50) {
if (this.radius < maxRadius) {
this.radius += 1;
}
} else if (this.radius > this.minRadius) {
this.radius -= 1;
}
this.draw();
}
}
function random(min, max) {
return Math.random() * (max - 1) + min;
}
</script>
</body>
</html>