Вращающиеся окружности

Пример:

Кликните на блок для обновления окружностей

HTML:

<canvas id="canvas"></canvas>

1	<canvas id="canvas"></canvas>

CSS:

#canvas {
	height: 500px;
	width: 100%;
	border: 4px solid #BFE2FF;
	margin: 20px 0;
}

#canvas {

height: 500px;

width: 100%;

border: 4px solid #BFE2FF;

margin: 20px 0;

}

JS:

Количество окружностей задается в переменной shapeNum для разной ширины канваса, а их обновление функцией onResize (в примере оно происходит по клику)

window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');
    if (!canvas || !canvas.getContext) {
		return false;
	}	
    function rand(min, max) {
		return Math.floor(Math.random() * (max - min + 1) + min);
	}
    var ctx = canvas.getContext('2d');
    var X = canvas.width = canvas.offsetWidth;
    var Y = canvas.height = canvas.offsetHeight;
    var shapes = [];
    var shapeNum = 18;
    if (X < 768) {
		shapeNum = 10;
	}
    window.requestAnimationFrame =
	window.requestAnimationFrame ||
	window.mozRequestAnimationFrame ||
	window.webkitRequestAnimationFrame ||
	window.msRequestAnimationFrame ||
	function(cb) {
        setTimeout(cb, 17);
	};	  
    function Shape(ctx, x, y, i) {
		this.ctx = ctx;
		this.init(x, y, i);
	}
    Shape.prototype.init = function(x, y, i) {
		this.x = x;
		this.y = y;
		this.r = rand(5, 10);
		this.lw = this.r / 30;
		this.a = rand(0, 360);
		this.rad = this.a * Math.PI / 180;
		this.num = rand(5, 20);
		this.angles = [];
		this.getAngles();
		this.as = Math.random() * 2;
	}; 
    Shape.prototype.getAngles = function() {
		for (var i = 0; i < this.num; i++) {
			var sAngle = rand(0, 360) * Math.PI / 180;
			var eAngle = rand(sAngle, 360) * Math.PI / 180;
			var angle = [sAngle, eAngle];
			this.angles.push(angle);
		}
	};
    Shape.prototype.draw = function() {
		var ctx  = this.ctx;
		ctx.save();
		ctx.lineWidth = this.lw;
		ctx.strokeStyle = '#000';
		ctx.beginPath();
		ctx.translate(this.x, this.y);
		ctx.rotate(this.rad);
		ctx.translate(-this.x, -this.y);
		for (var i = 0; i < this.num; i++) {
			ctx.beginPath();
			ctx.arc(this.x, this.y, this.r * i, this.angles[i][0], this.angles[i][1], false);
			ctx.stroke();
		}
		ctx.restore();
	};
    Shape.prototype.updateParams = function(i) {
		if (i % 2 === 0) {
			this.a += this.as;
			} else {
			this.a -= this.as;
		}
		this.rad = this.a * Math.PI / 180;
	};
    Shape.prototype.render = function(i) {
		this.updateParams(i);
		this.draw();
	};
    for (var i = 0; i < shapeNum; i++) {
		var s;
		if (i === 0) {
			s = new Shape(ctx, X / 2, Y / 2, i);
			} else {
			s = new Shape(ctx, rand(0, X), rand(0, Y), i);
		}
		shapes.push(s);
	}	
    function drawLine() {
		ctx.save();
		ctx.strokeStyle = '#000';
		ctx.lineWidth = 0.1;
		for (var i = 0; i < shapes.length - 1; i++) {
			ctx.beginPath();
			ctx.moveTo(shapes[i].x, shapes[i].y);
			ctx.lineTo(shapes[i + 1].x, shapes[i + 1].y);
			ctx.stroke();
		}
		ctx.restore();
	}	
    function render() {
		ctx.clearRect(0, 0, X, Y);
		drawLine();
		for (var i = 0; i < shapes.length; i++) {
			shapes[i].render(i);
		}
		requestAnimationFrame(render);
	}
    render();
    function onResize() {
		X = canvas.width = canvas.offsetWidth;
		Y = canvas.height = canvas.offsetHeight;
		shapes = [];
		if (X < 768) {
			shapeNum = 10;
			} else {
			shapeNum = 18;
		}
		for (var i = 0; i < shapeNum; i++) {
			var s;
			if (i === 0) {
				s = new Shape(ctx, X / 2, Y / 2, i);
				} else {
				s = new Shape(ctx, rand(0, X), rand(0, Y), i);
			}
			shapes.push(s);
		}
	}
    window.addEventListener('resize', function(){
		onResize();
	});
    canvas.addEventListener('click', function() {
		onResize();
	});
});

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window.addEventListener('load', function () {

var canvas = document.getElementById('canvas');

if (!canvas || !canvas.getContext) {

return false;

}

function rand(min, max) {

return Math.floor(Math.random() * (max - min + 1) + min);

}

var ctx = canvas.getContext('2d');

var X = canvas.width = canvas.offsetWidth;

var Y = canvas.height = canvas.offsetHeight;

var shapes = [];

var shapeNum = 18;

if (X < 768) {

shapeNum = 10;

}

window.requestAnimationFrame =

window.requestAnimationFrame ||

window.mozRequestAnimationFrame ||

window.webkitRequestAnimationFrame ||

window.msRequestAnimationFrame ||

function(cb) {

setTimeout(cb, 17);

};

function Shape(ctx, x, y, i) {

this.ctx = ctx;

this.init(x, y, i);

}

Shape.prototype.init = function(x, y, i) {

this.x = x;

this.y = y;

this.r = rand(5, 10);

this.lw = this.r / 30;

this.a = rand(0, 360);

this.rad = this.a * Math.PI / 180;

this.num = rand(5, 20);

this.angles = [];

this.getAngles();

this.as = Math.random() * 2;

};

Shape.prototype.getAngles = function() {

for (var i = 0; i < this.num; i++) {

var sAngle = rand(0, 360) * Math.PI / 180;

var eAngle = rand(sAngle, 360) * Math.PI / 180;

var angle = [sAngle, eAngle];

this.angles.push(angle);

}

};

Shape.prototype.draw = function() {

var ctx = this.ctx;

ctx.save();

ctx.lineWidth = this.lw;

ctx.strokeStyle = '#000';

ctx.beginPath();

ctx.translate(this.x, this.y);

ctx.rotate(this.rad);

ctx.translate(-this.x, -this.y);

for (var i = 0; i < this.num; i++) {

ctx.beginPath();

ctx.arc(this.x, this.y, this.r * i, this.angles[i][0], this.angles[i][1], false);

ctx.stroke();

}

ctx.restore();

};

Shape.prototype.updateParams = function(i) {

if (i % 2 === 0) {

this.a += this.as;

} else {

this.a -= this.as;

}

this.rad = this.a * Math.PI / 180;

};

Shape.prototype.render = function(i) {

this.updateParams(i);

this.draw();

};

for (var i = 0; i < shapeNum; i++) {

var s;

if (i === 0) {

s = new Shape(ctx, X / 2, Y / 2, i);

} else {

s = new Shape(ctx, rand(0, X), rand(0, Y), i);

}

shapes.push(s);

}

function drawLine() {

ctx.save();

ctx.strokeStyle = '#000';

ctx.lineWidth = 0.1;

for (var i = 0; i < shapes.length - 1; i++) {

ctx.beginPath();

ctx.moveTo(shapes[i].x, shapes[i].y);

ctx.lineTo(shapes[i + 1].x, shapes[i + 1].y);

ctx.stroke();

}

ctx.restore();

}

function render() {

ctx.clearRect(0, 0, X, Y);

drawLine();

for (var i = 0; i < shapes.length; i++) {

shapes[i].render(i);

}

requestAnimationFrame(render);

}

render();

function onResize() {

X = canvas.width = canvas.offsetWidth;

Y = canvas.height = canvas.offsetHeight;

shapes = [];

if (X < 768) {

shapeNum = 10;

} else {

shapeNum = 18;

}

for (var i = 0; i < shapeNum; i++) {

var s;

if (i === 0) {

s = new Shape(ctx, X / 2, Y / 2, i);

} else {

s = new Shape(ctx, rand(0, X), rand(0, Y), i);

}

shapes.push(s);

}

window.addEventListener('resize', function(){

onResize();

});

canvas.addEventListener('click', function() {

onResize();

});

За основу взят скрипт, найденный на codepen.io у пользователя Toshiya Marukubo

Пример:

HTML:

CSS:

JS:

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