function writeMessage(canvas, message) {
var context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height);
context.font = '18pt Calibri';
context.fillStyle = 'black';
context.fillText(message, 10, 25);
}
function getMousePos(canvas, evt) {
var rect = canvas.getBoundingClientRect(), root = document.documentElement;
// return relative mouse position
var mouseX = evt.clientX - rect.top - root.scrollTop;
var mouseY = evt.clientY - rect.left - root.scrollLeft;
return {
x: mouseX,
y: mouseY
};
}
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var message = "Mouse position: ";
writeMessage(canvas, message);
canvas.addEventListener('mousemove', function(evt) {
var mousePos = getMousePos(canvas, evt);
var message = "Mouse position: " + mousePos.x + "," + mousePos.y;
writeMessage(canvas, message);
}, false);
canvas.addEventListener('mouseout', function(evt) {
var message = "Mouse position: ";
writeMessage(canvas, message);
}, false);
<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
</body>
</html>
body {
margin: 0px;
padding: 0px;
}
#myCanvas {
border: 1px solid #9C9898;
}