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Created Jan 5, 2018
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JS Bin // source http://jsbin.com/jaqavetema
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<canvas id="myCanvas" width="1024" height="728"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
function getMousePos(canvas, evt) {
var rect = canvas.getBoundingClientRect();
return {
x: evt.clientX - rect.left,
y: evt.clientY - rect.top
};
}
context.beginPath();
canvas.addEventListener('mousemove', function(evt) {
var mousePos = getMousePos(canvas, evt);
context.lineTo(mousePos.x, mousePos.y);
context.fillStyle = 'red';
context.fillRect(mousePos.x - 2, mousePos.y - 2, 5, 5);
context.stroke();
}, false);
</script>
</body>
</html>
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