Canvas Drawing v2

Version 2 of Canvas Drawing

by Mike McDonald

HTML

<div id='draw'>
  <div id='container'>
    <canvas id='canvas' width='240' height='300'></canvas>
    <div id='colors'>
      <div id='red'></div>
      <div id='blue'></div>
      <div id='green'></div>
      <div id='black'></div>
      <div id='yellow'></div>
      <div id='cyan'></div>
      <div id='magenta'></div>
    </div>
    <div id='currentColor'></div>
  </div>
  <div id='buttons'>
    <input type='button' id='clear' value='Clear Canvas' onclick='clearCanvas()' />
    <a id='download'>Download Image</a>
    <input type='button' id='current' />
  </div>
</div>

CSS

#draw {
  border: 2px outset black;
  border-radius: 5px;
  display: inline-block;
  margin: 5px;
  padding: 10px;
}
#container {
  border: 2px solid black;
  width: 300px;
  height: 300px;
  position: relative;
}
#canvas {
  position: absolute;
  background-color: lightgrey;
}
#colors {
  float: right;
  position: relative;
  width: 20%;
  height: 100%;
}
#colors div {
  width: 100%
}
#buttons {
  width: 100%;
  height: auto;
}
#buttons * {
  width: 33%;
  background-color: lightgrey;
  margin-top: 5px;
  margin-left: 5px;
  display: inline;
}
#download {
    text-align: center;
    border-radius: 2px;
    padding-left: 5px;
    padding-right: 5px;
    border: 2px outset lightgrey;
    font-family: 'Arial';
    background-color: lightgrey;
    font-size: 10pt;
    cursor: context-menu;
}
#download:link {
  text-decoration: none;
  color: black;
}
#download:active {
  border: 2px inset #00acff;
  border-radius: 2px;
}
#current {
  height: 100%;
  width: 10%;
  border: 1px solid black;
  display: inline;
  position: relative;
  margin-left: 25px;
}

Vue

var colors = document.querySelectorAll('#colors div');
var link = document.getElementById('download');
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var drawing = false;
var prev;
document.getElementById('current').style.backgroundColor = context.strokeStyle;
for (var i = 0; i < colors.length; i++) {
	colors[i].addEventListener('click', function(e) {
  	var src = e.srcElement;
    var color = src.style.backgroundColor;
    context.strokeStyle = color;
    document.getElementById('current').style.backgroundColor = color;
  });
  colors[i].style.height = 100 / colors.length + '%';
  colors[i].style.backgroundColor = colors[i].id;
}
function clearCanvas() {
	context.clearRect(0, 0, canvas.width, canvas.height);
}
link.addEventListener('click', function() {
	link.href = canvas.toDataURL();
  link.download = 'image.png';
});
canvas.addEventListener('mousedown', function(e) {
	drawing = true;
});
canvas.addEventListener('mousemove', function(e) {
	
	if (drawing) {
  console.log(e);
  	var coord = { 'x': event.pageX - 20 - this.offsetLeft, 'y': event.pageY  - 20 - this.offsetTop };
    if (prev !== undefined) {
    	context.beginPath();
      context.moveTo(prev.x, prev.y);
      context.lineTo(coord.x, coord.y);
      context.stroke();
    }
    prev = coord;
  }
});
canvas.addEventListener('mouseup', function() {
	drawing = false;
  prev = undefined;
});