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gravity.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">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body{
margin: 0;
}
</style>
</head>
<body>
<canvas></canvas>
<script>
var c = document.querySelector('canvas');
var ctx = c.getContext('2d');
c.width = window.innerWidth;
c.height = window.innerHeight;
window.addEventListener('resize', function(){
c.width = window.innerWidth;
c.height = window.innerHeight;
init();
})
function Circle(x, y, dx, dy, radius, color){
this.x = x;
this.y = y;
this.dx = dx;
this.dy = dy;
this.radius = radius;
this.color = color;
this.draw = function()
{
ctx.beginPath();
ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
ctx.fillStyle = color;
ctx.fill();
ctx.stroke();
}
this.update = function()
{
this.x += this.dx;
this.y += this.dy;
if(this.dy + gravity < 2
&& this.y+this.radius > c.height - 2)
{
this.dy = 0;
}
else {
this.dy += gravity;
}
if(this.x + this.radius > c.width || this.x - this.radius < 0)
this.dx = -this.dx;
if(this.y + this.radius > c.height || this.y - this.radius + this.dy < 0)
this.dy = -this.dy * fraction;
this.draw();
}
}
var circleArray;
var gravity = 1;
var fraction = 0.7;
var colorArray = [
'#EB6896',
'#C36894',
'#836890',
'#46698D',
'#0F6A8B'
]
function init()
{
circleArray = [];
for(var i = 0; i < 100; i++)
{
var radius = Math.random() * 10 + 10;
var x = Math.random() * (c.width - 2 * radius) + radius;
var y = Math.random() * (c.height - 2 * radius) + radius;
var dx = (Math.random() - 0.5) * 4;
var dy = (Math.random() - 0.5) * 4;
var color = colorArray[Math.floor(Math.random() * colorArray.length)];
circleArray.push(new Circle(x, y, dx, dy, radius, color));
}
}
function animate()
{
requestAnimationFrame(animate);
ctx.clearRect(0, 0, c.width, c.height);
for(var i = 0; i < 100; i++)
circleArray[i].update();
}
init();
animate();
</script>
</body>
</html>