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              <main class="main">
	<canvas id="canvas"></canvas>
</main>
            
          
!
            
              (function(){
	let $ = {
		width: 0,
		height: 0
	};
	// dispach add removeを追加
	let store = [];
	let width = $.width = 480;
	let height = $.height = 480;
	let canvas;
	let ctx;
	let temp_canvas = document.createElement("canvas");
	let temp_ctx = temp_canvas.getContext("2d");
	let requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
		window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
    	window.requestAnimationFrame = requestAnimationFrame;
	const NUMBER_OF_LARD = 10;
	const MAX_RADIUS = 98 / 0.7;
	const MIN_RADIUS = 21 / 0.7;
	const THRESHOLD = 150;

	document.addEventListener("DOMContentLoaded", function() {
		setup();
	});

	function setup() {
		canvas = document.getElementById("canvas");
		ctx = canvas.getContext("2d");
		canvas.width = temp_canvas.width = width;
		canvas.height = temp_canvas.height = height;

		init();
		draw();
	}

	function init(){
		for(let i = 0; i < NUMBER_OF_LARD; i+=1){
			let radius = Math.floor(Math.random()*(MAX_RADIUS+1-MIN_RADIUS)+MIN_RADIUS);
			let x = Math.floor(Math.random()*(width+1-(radius*2))+radius);
			let y = Math.floor(Math.random()*(height+1-(radius*2))+radius);
			let lard = new Lard({x:x, y:y},radius, temp_ctx);
			store.push(lard);
		}
	}

	function draw(){
		requestAnimationFrame(draw);
		
		temp_ctx.clearRect(0,0, width, height);
		for(let i = 0, iz = store.length; i < iz; i += 1){
			store[i].draw();
		}

		let imageData = temp_ctx.getImageData(0,0,width,height);
        let pix = imageData.data;

        for(let i = 0, iz = pix.length; i < iz; i+=4){
        	if(pix[i+3] < THRESHOLD){
        		pix[i+3] = 0;
        	}else{
        		pix[i+3] = 255
        	}
        }
        ctx.putImageData(imageData, 0, 0);
	}

	function rotate_to_point(n, m){
		let distance_x = n.x - m.x;
		let distance_y = n.y - m.y;
		let angle = Math.floor(Math.atan2(distance_x, distance_y) * 100) / 100;
		return angle;
	}
  
  class Lard{
	constructor(position, radius, ctx){
		this.position = position;
		this.radius = radius;
		this.ctx = ctx;
		this.is_graunding = false;
		this.is_separating = false;
		this.is_independent = true;
		this.vx =  ((Math.random() * 2 - 1) >= 0)? 1: -1;
		this.vx *= Math.floor((Math.random() * 3) + 1);
		this.vy =  ((Math.random() * 2 - 1) >= 0)? 1: -1;
		this.vy *= Math.floor((Math.random() * 3) + 1);
	}
	draw(){
		let p = this.position;
		let colors = this.colors;
		let radius = this.radius;
		// グラデーション
		this.ctx.beginPath();
		this.grad = this.ctx.createRadialGradient(
			p.x, p.y, 0,
			p.x, p.y, this.radius
		);
		this.grad.addColorStop(0, "rgba(211,47,47,1)");
        this.grad.addColorStop(1, "rgba(211,47,47,0)");
		this.ctx.fillStyle = this.grad;
		this.ctx.arc(p.x, p.y, this.radius, 0, Math.PI*2);
		this.ctx.fill();

		p.x += this.vx;
		p.y += this.vy;

		if(p.x < this.radius || p.x > $.width - this.radius){
			this.vx *= -1;
		}

		if(p.y < this.radius || p.y > $.height - this.radius){
			this.vy *= -1;
		}
	}
}
}()) 
            
          
!
999px
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