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whiteboard.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script type="text/JavaScript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js?ver=1.4.2"></script>
<style>
canvas{
border:3px solid blue;
}
</style>
</head>
<body>
<script>
window.onload = function() {
var myCanvas = document.getElementById("myCanvas");
var ctx = myCanvas.getContext("2d");
// Fill Window Width and Height
// Set Background Color
ctx.fillStyle="#fff";
ctx.fillRect(0,0,myCanvas.width,myCanvas.height);
// Mouse Event Handlers
if(myCanvas){
var isDown = false;
var canvasX, canvasY;
ctx.lineWidth = 5;
$(myCanvas)
.mousedown(function(e){
isDown = true;
ctx.beginPath();
canvasX = e.pageX - myCanvas.offsetLeft;
canvasY = e.pageY - myCanvas.offsetTop;
ctx.moveTo(canvasX, canvasY);
})
.mousemove(function(e){
if(isDown !== false) {
canvasX = e.pageX - myCanvas.offsetLeft;
canvasY = e.pageY - myCanvas.offsetTop;
ctx.lineTo(canvasX, canvasY);
ctx.strokeStyle = "#000";
ctx.stroke();
}
})
.mouseup(function(e){
isDown = false;
ctx.closePath();
});
}
// Touch Events Handlers
draw = {
started: false,
start: function(evt) {
ctx.beginPath();
ctx.moveTo(
evt.touches[0].pageX,
evt.touches[0].pageY
);
this.started = true;
},
move: function(evt) {
if (this.started) {
ctx.lineTo(
evt.touches[0].pageX,
evt.touches[0].pageY
);
ctx.strokeStyle = "#000";
ctx.lineWidth = 5;
ctx.stroke();
}
},
end: function(evt) {
this.started = false;
}
};
// Touch Events
myCanvas.addEventListener('touchstart', draw.start, false);
myCanvas.addEventListener('touchend', draw.end, false);
myCanvas.addEventListener('touchmove', draw.move, false);
// Disable Page Move
document.body.addEventListener('touchmove',function(evt){
evt.preventDefault();
},false);
};
</script>
<canvas id="myCanvas" height="500px" width="1000px">
Sorry, your browser does not support HTML5 canvas technology.
</canvas>
<Center><h2>Aswin's Whiteboard</h2></center>
</body>
</html>