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HTML 

              
                <div id="draw">
	<div class="welcome-bg" v-if="popups.showWelcome">
		<div class="welcome">
			<h1 class="fade-up">Vue JS draw</h1>
			<h2 class="fade-up">
				By Lewi Hussey
			</h2>
			<a href="//twitter.com/lewitje" target="blank" title="Lewi Hussey on Twitter" class="fade-up">@lewitje</a>
			<span class="btn fade-up"
						title="Close"
						v-on:click="popups.showWelcome = false">
				Lets go
			</span>
		</div>
	</div>
	<div class="app-wrapper">
		<canvas id="canvas">
		</canvas>
		<div class="cursor" id="cursor"></div>
		<div class="controls">
			<div class="btn-row">
				<div class="history" title="history">
					{{ history.length }}
				</div>
			</div>
			<div class="btn-row">
				<button type="button"
								v-on:click="removeHistoryItem"
								v-bind:class="{ disabled: !history.length }" title="Undo">
					<i class="ion ion-reply"></i>
				</button>
				<button type="button"
								v-on:click="removeAllHistory"
								v-bind:class="{ disabled: !history.length }" title="Clear all">
					<i class="ion ion-trash-a"></i>
				</button>
			</div>
			
			<div class="btn-row">
				<button title="Brush options"
								v-on:click="popups.showOptions = !popups.showOptions">
					<i class="ion ion-android-create"></i>
				</button>
				
				<div class="popup" v-if="popups.showOptions">
					<div class="popup-title">
						Options
					</div>
					<button title="Restrict movement vertical"
									v-on:click="options.restrictY = !options.restrictY; options.restrictX = false"
									v-bind:class="{ active: options.restrictY }"
									title="Restrict vertical">
						<i class="ion ion-arrow-right-c"></i>
						Restrict vertical
					</button>
					<button title="Restrict movement horizontal"
									v-on:click="options.restrictX = !options.restrictX; options.restrictY = false"
									v-bind:class="{ active: options.restrictX }"
									title="Restrict horizontal">
						<i class="ion ion-arrow-up-c"></i>
						Restrict horizontal
					</button>
					<button type="button"
								v-on:click="simplify"
								v-bind:class="{ disabled: !history.length }" title="Simplify paths">
						<i class="ion ion-wand"></i>
						Simplify paths
					</button>
					<button type="button"
									v-on:click="jumble"
									v-bind:class="{ disabled: !history.length }" title="Go nutz">
						<i class="ion ion-shuffle"></i>
						Go nutz
					</button>
				</div>
				
			</div>

			<div class="btn-row">
				<button title="Pick a brush size"
								v-on:click="popups.showSize = !popups.showSize"
								v-bind:class="{ active: popups.showSize }">
					<i class="ion ion-android-radio-button-on"></i>
					<span class="size-icon">
						{{ size }}
					</span>
				</button>
				
				<div class="popup" v-if="popups.showSize">
					<div class="popup-title">
						Brush size
					</div>
					<label v-for="sizeItem in sizes" class="size-item">
						<input type="radio" name="size" v-model="size" v-bind:value="sizeItem">
						<span class="size"
									v-bind:style="{width: sizeItem + 'px', height: sizeItem + 'px'}"
									v-on:click="popups.showSize = !popups.showSize"></span>
					</label>
				</div>
			</div>
			
			<div class="btn-row">
				<button title="Pick a color"
								v-on:click="popups.showColor = !popups.showColor"
								v-bind:class="{ active: popups.showColor }">
					<i class="ion ion-android-color-palette"></i>
					<span class="color-icon"
								v-bind:style="{backgroundColor: color}">
					</span>
				</button>
				
				<div class="popup" v-if="popups.showColor">
					<div class="popup-title">
						Brush color
					</div>
					<label v-for="colorItem in colors" class="color-item">
						<input type="radio"
									 name="color"
									 v-model="color"
									 v-bind:value="colorItem">
						<span v-bind:class="'color color-' + colorItem"
									v-bind:style="{backgroundColor: colorItem}"
									v-on:click="popups.showColor = !popups.showColor"></span>
					</label>
				</div>
			</div>
			
			<div class="btn-row">
				<button title="Save"
								v-on:click="popups.showSave = !popups.showSave">
					<i class="ion ion-android-cloud-outline"></i>
				</button>
				
				<div class="popup" v-if="popups.showSave">
					<div class="popup-title">
						Save your design
					</div>
					<div class="form">
						<input type="text"
									 placeholder="Save name"
									 v-model="save.name">
						<div v-if="save.name.length < 3" class="text-faded">
							<i>
								Min 3 characters
							</i>
						</div>
						<span class="btn"
									v-on:click="saveItem">
							Save as
							<span class="text-faded"> 
								{{ save.name }}
							</span>
						</span>
					</div>
					
					<div class="saves" v-if="save.saveItems.length">
						<div class="popup-title">
							Load a save
						</div>

						<div class="save-item"
								 v-for="item in save.saveItems">
							<h3>{{ item.name }}</h3>
							<span class="btn"
										v-on:click="loadSave(item)">load</span>
						</div>
					</div>
				</div>
				
			</div>
			
			<div class="btn-row">
				<button v-on:click="popups.showWelcome = true" title="Made by Lewi">
					<i class="ion ion-heart"></i>
				</button>
			</div>
		</div>
	</div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Roboto:300,400,500');

$prim: rgb(0, 149, 255);

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	background-color: black;
	color: white;
}

body,
button,
input {
	font-family: 'Roboto', sans-serif;
	font-size: 14px;
	font-weight: 400;
}

h1,
h2,
h3,
h4,
h5{
	font-weight: 500;
}

.text-faded {
	opacity: .5;
}

.cursor {
	position: fixed;
	top: 0;
	left: 0;
	width: 20px;
	height: 20px;
	border-radius: 50%;
	border: 3px solid rgb(30, 30, 30);
	pointer-events: none;
	user-select: none;
	mix-blend-mode: difference;
	opacity: 0;
	transition: opacity 1s;
}

canvas {
	width: 100%;
	height: calc(100vh - 60px);
	background-color: white;
	cursor: none;
	
	&:hover + .cursor {
		opacity: 1;
	}
	
	&:active + .cursor {
		border-color: rgb(60, 60, 60);
	}
}

.controls {
	position: fixed;
	z-index: 5;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 60px;
	background-color: rgb(10, 10, 10);
	display: flex;
	justify-content: center;
	align-items: center;
	user-select: none;
}

.stat {
	font-size: 20px;
	margin-bottom: 15px;
}

.btn-row {
	position: relative;
	margin-bottom: 5px;
	display: flex;
	justify-content: center;
	flex-wrap: wrap;
	padding: 0 15px;
	border-radius: 4px;
}

.popup {
	position: absolute;
	width: 300px;
	bottom: 58px;
	padding: 30px;
	left: calc(50% - 150px);
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	background-color: white;
	color: rgb(30, 30, 30);
	border-radius: 10px 10px 0 0;
	border: 1px solid rgb(220, 220, 220);
	border-bottom-width: 0;
	opacity: 0;
	animation: popup .5s forwards cubic-bezier(.2, 2, .4, 1);
	z-index: 2;
	overflow: hidden;
	max-height: 80vh;
	overflow-y: auto;
	
	.popup-title {
		flex: 0 0 100%;
		text-align: center;
		font-size: 16px;
		color: black;
		opacity: .5;
		margin-bottom: 10px;
	}
	
	button {
		height: 80px;
		width: 80px;
		text-align: center;
		font-size: 14px;
		color: rgba(0, 0, 0, .4);
		
		i {
			display: block;
			font-size: 30px;
			margin-bottom: 5px;
			color: rgba(0, 0, 0, .2);
		}
		
		&.disabled {
			color: rgba(0, 0, 0, .2);
			
			i {
				color: rgba(0, 0, 0, .1);
			}
		}
		
		&.active,
		&:active {
			color: rgba(0, 0, 0, .4);
			
			i {
				color: $prim;
			}
		}
	}
}

@keyframes popup {
	from {
		opacity: 0;
		transform: translateX(40px);
	}
	to {
		opacity: 1;
		transform: none;
	}
}

.welcome-bg {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 9;
	background-color: $prim;
	display: flex;
	justify-content: center;
	align-items: center;
}

.fade-up {
	opacity: 0;
	animation: fade-up 1s forwards cubic-bezier(.2, 2, .4, 1);
}

.btn {
	display: inline-block;
	margin-top: 10px;
	padding: 10px 20px;
	font-weight: 400;
	font-size: 16px;
	border-radius: 4px;
	background-color: $prim;
	color: white;
	animation-delay: 1s;
	transition: all .15s;
	cursor: pointer;

	&:hover {
		background-color: lighten($prim, 10%);
	}
}

.welcome {
	width: 400px;
	height: 400px;
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
		
	h1.fade-up {
		font-weight: 300;
		font-size: 40px;
		animation-delay: .25s;
	}
	
	h2.fade-up {
		font-weight: 400;
		color: rgba(255, 255, 255, .5);
		animation-delay: .5s;
	}
	
	a.fade-up {
		color: rgba(255, 255, 255, .5);
		display: inline-block;
		margin-top: 20px;
		text-decoration: none;
		animation-delay: .75s;
	}
	
	.btn.fade-up {
		background-color: rgba(255, 255, 255, .2);
		color: white;
		margin-top: 60px;
		
		&:hover {
			background-color: rgba(255, 255, 255, .3);
		}
	}
}


@keyframes fade-up {
	from {
		transform: translateY(80px);
		opacity: 0;
	}
	to {
		transform: none;
		opacity: 1;
	}
}

.form {
	flex: 0 0 100%;
	
	input {
		display: block;
		appearance: none;
		border: 0;
		box-shadow: 0;
		outline: 0;
		background-color: rgb(240, 240, 240);
		border-radius: 4px;
		padding: 10px 15px;
		width: 100%;
		margin-bottom: 4px;
	}
}

button {
	appearance: none;
	border: 0;
	border-radius: 0;
	box-shadow: 0;
	width: 40px;
	height: 60px;
	display: inline-block;
	background-color: transparent;
	color: rgb(140, 140, 140);
	font-size: 22px;
	transition: all .15s;
	cursor: pointer;
	outline: 0;
	position: relative;
	
	.size-icon,
	.color-icon {
		position: absolute;
		top: 10px;
		right: 0;
	}
	
	.color-icon {
		width: 5px;
		height: 5px;
		border-radius: 50%;
	}
	
	.size-icon {
		font-size: 6px;
		text-align: right;
	}
		
	&:hover {
		opacity: .8;
	}
	
	&:active,
	&.active{
		color: white;
	}
	
	&.disabled {
		color: rgb(50, 50, 50);
		cursor: not-allowed;
	}
}

.history {
	width: 30px;
	height: 30px;
	background-color: rgb(30, 30, 30);
	border-radius: 50%;
	text-align: center;
	line-height: 30px;
	font-size: 12px;
	overflow: hidden;
	color: rgb(140, 140, 140);
}
	
.color-item {
	position: relative;
	display: inline-block;
	cursor: pointer;
	width: 60px;
	height: 60px;
	display: flex;
	justify-content: center;
	align-items: center;

	input {
		position: absolute;
		opacity: 0;
		top: 0;
		left: 0;
		width: 0;
		height: 0;
	}
	
	input:checked + .color {
		opacity: 1;
		border: 2px solid $prim;
	}
	
	.color {
		display: block;
		width: 30px;
		height: 30px;
		background-color: white;
		border-radius: 50%;
		
		&:hover {
			opacity: .8;
		}
	}
}

@keyframes pulsate {
	0%,
	100% {
		transform: none;
	}
	50% {
		transform: scale(1.15);
	}
}

.size-item {
	width: 40px;
	height: 60px;
	display: inline-flex;
	position: relative;
	justify-content: center;
	align-items: center;
	vertical-align: top;
	cursor: pointer;
	
	input {
		position: absolute;
		top: 0;
		left: 0;
		width: 0;
		height: 0;
		opacity: 0;
	}
	
	.size {
		background-color: rgb(140, 140, 140);
		display: inline-block;
		border-radius: 50%;
		transition: all .15s;
		transform: translate(-50%, -50%) scale(.6);
		position: absolute;
		top: 50%;
		left: 50%;
		
		&:hover {
			opacity: .8;
		}
	}
	
	input:checked + .size {
		background-color: $prim;
	}
}

.saves {
	flex: 0 0 calc(100% + 60px);
	margin: 30px -30px -30px;
	padding: 30px;
	background-color: rgb(240, 240, 240);
	max-height: 250px;
	overflow-y: auto;
	
	.save-item {
		width: 100%;
		display: flex;
		justify-content: space-between;
		align-items: center;
	}
}
!

JS 

              
                var app = new Vue({
  el: '#draw',
  data: {
    history: [],
		color: '#13c5f7',
		popups: {
			showColor: false,
			showSize: false,
			showWelcome: true,
			showSave: false,
			showOptions: false
		},
		options: {
			restrictY: false,
			restrictX: false
		},
		save: {
			name: '',
			saveItems: []
		},
		size: 12,
		colors: [
			'#d4f713',
			'#13f7ab',
			'#13f3f7',
			'#13c5f7',
			'#138cf7',
			'#1353f7',
			'#2d13f7',
			'#7513f7',
			'#a713f7',
			'#d413f7',
			'#f713e0',
			'#f71397',
			'#f7135b',
			'#f71313',
			'#f76213',
			'#f79413',
			'#f7e013'],
		sizes: [6, 12, 24, 48],
		weights: [ 2, 4, 6 ]
  },
	methods: {
		removeHistoryItem: ()=>{
			app.history.splice(app.history.length-2, 1);
			draw.redraw();
		},
		removeAllHistory: ()=>{
			app.history = [];
			draw.redraw();
		},
		simplify: ()=>{
			var simpleHistory = [];
			app.history.forEach((item, i)=>{
				if(i % 6 !== 1 || item.isDummy){
					simpleHistory.push(item);
				}
			});
			app.history = simpleHistory;
			draw.redraw();
		},
		jumble: ()=>{
			var simpleHistory = [];
			app.history.forEach((item, i)=>{
				item.r += Math.sin(i * 20) * 5;
			});
			app.history = app.shuffle(app.history);
			draw.redraw();
		},
		shuffle: (a)=>{
			var b = [];
			
			a.forEach((item, i)=>{
				if(!item.isDummy){
					var l = b.length;
					var r = Math.floor(l * Math.random());
					b.splice(r, 0, item);
				}
			});
			
			for(var i = 0; i < b.length; i++){
				if(i % 20 === 1){
					b.push(draw.getDummyItem());	
				}
			}
			
			return b;
		},
		saveItem: ()=>{
			if(app.save.name.length > 2){
				var historyItem = {
					history: app.history.slice(),
					name: app.save.name
				};

				app.save.saveItems.push(historyItem);
				app.save.name = "";
			}
		},
		loadSave: (item)=>{
			app.history = item.history.slice();
			draw.redraw();
		}
	}
});

class Draw {
	constructor(){
		this.c = document.getElementById('canvas');
		this.ctx = this.c.getContext('2d');
		
		this.mouseDown = false;
		this.mouseX = 0;
		this.mouseY = 0;
		
		this.tempHistory = [];
		
		this.setSize();
		
		this.listen();
		
		this.redraw();
	}
	
	listen(){
		this.c.addEventListener('mousedown', (e)=>{
			this.mouseDown = true;
			this.mouseX = e.offsetX;
			this.mouseY = e.offsetY;
			this.setDummyPoint();
		});
		
		this.c.addEventListener('mouseup', ()=>{
			if(this.mouseDown){
				this.setDummyPoint();
			}
			this.mouseDown = false;
		});
		
		this.c.addEventListener('mouseleave', ()=>{
			if(this.mouseDown){
				this.setDummyPoint();
			}
			this.mouseDown = false;
		});
		
		this.c.addEventListener('mousemove', (e)=>{
			this.moveMouse(e);
			
			if(this.mouseDown){
				this.mouseX = this.mouseX;
				this.mouseY = this.mouseY;
				
				if(!app.options.restrictX){
					this.mouseX = e.offsetX;
				}
				
				if(!app.options.restrictY){
					this.mouseY = e.offsetY;
				}
								
				var item = {
					isDummy: false,
					x: this.mouseX,
					y: this.mouseY,
					c: app.color,
					r: app.size
				};
				
				app.history.push(item);
				this.draw(item, app.history.length);
			}
		});
		
		window.addEventListener('resize', ()=>{
			this.setSize();
			this.redraw();
		});
	}
	
	setSize(){
		this.c.width = window.innerWidth;
		this.c.height = window.innerHeight - 60;
	}
	
	moveMouse(e){
		let x = e.offsetX;
		let y = e.offsetY;
		
		var cursor = document.getElementById('cursor');
		
		cursor.style.transform = `translate(${x - 10}px, ${y - 10}px)`;
	}
	
	getDummyItem(){
		var lastPoint = app.history[app.history.length-1];
		
		return {
			isDummy: true,
			x: lastPoint.x,
			y: lastPoint.y,
			c: null,
			r: null
		};
	}
	
	setDummyPoint(){
		var item = this.getDummyItem();
		app.history.push(item);
		this.draw(item, app.history.length);
	}
	
	redraw(){
		this.ctx.clearRect(0, 0, this.c.width, this.c.height);
		this.drawBgDots();
		
		if(!app.history.length){
			return true;
		}
		
		app.history.forEach((item, i)=>{
			this.draw(item, i);
		});
	}
	
	drawBgDots(){
		var gridSize = 50;
		this.ctx.fillStyle = 'rgba(0, 0, 0, .2)';
		
		for(var i = 0; i*gridSize < this.c.width; i++){
			for(var j = 0; j*gridSize < this.c.height; j++){
				if(i > 0 && j > 0){
					this.ctx.beginPath();
					this.ctx.rect(i * gridSize, j * gridSize, 2, 2);
					this.ctx.fill();
					this.ctx.closePath();
				}
			}
		}
	}
	
	draw(item, i){
		this.ctx.lineCap = 'round';
		this.ctx.lineJoin="round";
		
		var prevItem = app.history[i-2];
				
		if(i < 2){
			return false;
		}

		if(!item.isDummy && !app.history[i-1].isDummy && !prevItem.isDummy){
			this.ctx.strokeStyle = item.c;
			this.ctx.lineWidth = item.r;
			
			this.ctx.beginPath();
			this.ctx.moveTo(prevItem.x, prevItem.y);
			this.ctx.lineTo(item.x, item.y);
			this.ctx.stroke();
			this.ctx.closePath();
		} else if (!item.isDummy) {			
			this.ctx.strokeStyle = item.c;
			this.ctx.lineWidth = item.r;
			
			this.ctx.beginPath();
			this.ctx.moveTo(item.x, item.y);
			this.ctx.lineTo(item.x, item.y);
			this.ctx.stroke();
			this.ctx.closePath();
		}
	}
}

var draw = new Draw();
!
999px

Console