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HTML

              
                


<div id="page">
    <div class="header">
		<a id="new" class="navbtn">New</a>
        <div class="title">Sketch Pad</div>
    </div>
    <div id="content"><p style="text-align:center">Loading Canvas...</p></div>
    <div class="footer">
		<div class="palette-case">
			<div class="palette-box">
				<div class="palette white"></div>
			</div>	
			<div class="palette-box">
				<div class="palette red"></div>
			</div>
			<div class="palette-box">
				<div class="palette blue"></div>
			</div>
			<div class="palette-box">
				<div class="palette green"></div>
			</div>
			<div class="palette-box">
				<div class="palette black"></div>
			</div>		
			<div style="clear:both"></div>
		</div>
    </div>
</div> 

              
            
!

CSS

              
                
body {
    margin:0px;
    width:100%;
    height:100%;
    overflow:hidden;
    font-family:Arial;
    /* prevent text selection on ui */
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    /* prevent scrolling in windows phone */
    -ms-touch-action: none;
    /* prevent selection highlight */
    -webkit-tap-highlight-color: rgba(0,0,0,0);
}
        
.header, .footer{
    position: absolute;
    background-color: #222;
    text-align: center;
}
.header {
    top: 0px;
    left: 0px;
    right: 0px;
    height: 32px;
    padding:6px;
}
.footer {
    bottom: 0px;
    left: 0px;
    right: 0px;
    height: 42px;
    padding:2px;    
}
.title {
    width: auto;
    line-height: 32px;
    font-size: 20px;
    font-weight: bold;
    color: #eee;
    text-shadow: 0px -1px #000;
    padding:0 60px;
}
.navbtn {
    cursor: pointer;
    float:left;
    padding: 6px 10px;
    font-weight: bold;
    line-height: 18px;
    font-size: 14px;
    color: #eee;
    text-shadow: 0px -1px #000;
    border: solid 1px #111;
    border-radius: 4px;
    background-color: #404040;
    box-shadow: 0 0 1px 1px #555,inset 0 1px 0 0 #666;     
}
.navbtn-hover, .navbtn:active {
    color: #222;
    text-shadow: 0px 1px #aaa;
    background-color: #aaa;
    box-shadow: 0 0 1px 1px #444,inset 0 1px 0 0 #ccc;   
}
#content{
    position: absolute;
    top: 44px;
    left: 0px;
    right: 0px;
    bottom: 46px;
    overflow:hidden;
    background-color:#ddd;
}
#canvas{
    cursor:crosshair ;
    background-color:#fff;
}
.palette-case {
    width:260px;
    margin:auto;
    text-align:center;
}
.palette-box {
    float:left;
    padding:2px 6px 2px 6px;
}
.palette {
    border:2px solid #777;
    height:36px;
    width:36px;
}
.red{
    background-color:#c22;
}
.blue{
    background-color:#22c;
}
.green{
    background-color:#2c2;
}
.white{
    background-color:#fff;
}
.black{
    background-color:#000;
    border:2px dashed #fff;
}
    
              
            
!

JS

              
                
	
var ctx, color = "#000";	
$(document).ready(function () {
	
	// setup a new canvas for drawing wait for device init
    setTimeout(function(){
	   newCanvas();
    }, 1000);
		
	// reset palette selection (css) and select the clicked color for canvas strokeStyle
	$(".palette").click(function(){
		$(".palette").css("border-color", "#777");
		$(".palette").css("border-style", "solid");
		$(this).css("border-color", "#fff");
		$(this).css("border-style", "dashed");
		color = $(this).css("background-color");
		ctx.beginPath();
		ctx.strokeStyle = color;
	});
    
	// link the new button with newCanvas() function
	$("#new").click(function() {
		newCanvas();
	});
});
// function to setup a new canvas for drawing
function newCanvas(){
	//define and resize canvas
    $("#content").height($(window).height()-90);
    var canvas = '<canvas id="canvas" width="'+$(window).width()+'" height="'+($(window).height()-90)+'"></canvas>';
	$("#content").html(canvas);
    
    // setup canvas
	ctx=document.getElementById("canvas").getContext("2d");
	ctx.strokeStyle = color;
	ctx.lineWidth = 5;	
	
	// setup to trigger drawing on mouse or touch
	$("#canvas").drawTouch();
    $("#canvas").drawPointer();
	$("#canvas").drawMouse();
}
// prototype to	start drawing on touch using canvas moveTo and lineTo
$.fn.drawTouch = function() {
	var start = function(e) {
        e = e.originalEvent;
		ctx.beginPath();
		x = e.changedTouches[0].pageX;
		y = e.changedTouches[0].pageY-44;
		ctx.moveTo(x,y);
	};
	var move = function(e) {
		e.preventDefault();
        e = e.originalEvent;
		x = e.changedTouches[0].pageX;
		y = e.changedTouches[0].pageY-44;
		ctx.lineTo(x,y);
		ctx.stroke();
	};
	$(this).on("touchstart", start);
	$(this).on("touchmove", move);	
}; 
    
// prototype to	start drawing on pointer(microsoft ie) using canvas moveTo and lineTo
$.fn.drawPointer = function() {
	var start = function(e) {
        e = e.originalEvent;
		ctx.beginPath();
		x = e.pageX;
		y = e.pageY-44;
		ctx.moveTo(x,y);
	};
	var move = function(e) {
		e.preventDefault();
        e = e.originalEvent;
		x = e.pageX;
		y = e.pageY-44;
		ctx.lineTo(x,y);
		ctx.stroke();
    };
	$(this).on("MSPointerDown", start);
	$(this).on("MSPointerMove", move);
};        
// prototype to	start drawing on mouse using canvas moveTo and lineTo
$.fn.drawMouse = function() {
	var clicked = 0;
	var start = function(e) {
		clicked = 1;
		ctx.beginPath();
		x = e.pageX;
		y = e.pageY-44;
		ctx.moveTo(x,y);
	};
	var move = function(e) {
		if(clicked){
			x = e.pageX;
			y = e.pageY-44;
			ctx.lineTo(x,y);
			ctx.stroke();
		}
	};
	var stop = function(e) {
		clicked = 0;
	};
	$(this).on("mousedown", start);
	$(this).on("mousemove", move);
	$(window).on("mouseup", stop);
};


              
            
!
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