jQM Sketch.js

HTML

<div data-role="page" id="page1">
    <div data-role="header">
         <h1>My page</h1> 
    </div>
    <div data-role="content">
        Draw on canvas:
        <canvas id="canvas1" ></canvas>
        <a id="clearCanvas1" href="#canvas1">clearCanvas</a>
    </div>
</div>

CSS

#canvas1 {
    width:100%; 
    background:white; 
    height:150px; 
    border: 3px solid #333;
}

JavaScript

var $msg;
function Msg(text){
    if (!$msg) $msg = $('#msgInput');
    $msg.val(text);
}

var __slice = Array.prototype.slice;
(function($) {
  var Sketch;
  $.fn.sketch = function() {
    var args, key, sketch;
    key = arguments[0], args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
    if (this.length > 1) {
      $.error('Sketch.js can only be called on one element at a time.');
    }
    sketch = this.data('sketch');
    if (typeof key === 'string' && sketch) {
      if (sketch[key]) {
        if (typeof sketch[key] === 'function') {
          return sketch[key].apply(sketch, args);
        } else if (args.length === 0) {
          return sketch[key];
        } else if (args.length === 1) {
          return sketch[key] = args[0];
        }
      } else {
        return $.error('Sketch.js did not recognize the given command.');
      }
    } else if (sketch) {
      return sketch;
    } else {
      this.data('sketch', new Sketch(this.get(0), key));
      return this;
    }
  };
  Sketch = (function() {
    function Sketch(el, opts) {
      this.el = el;
      this.canvas = $(el);
      this.context = el.getContext('2d');
      this.options = $.extend({
        toolLinks: true,
        defaultTool: 'marker',
        defaultColor: '#000000',
        defaultSize: 5
      }, opts);
      this.painting = false;
      this.color = this.options.defaultColor;
      this.size = this.options.defaultSize;
      this.tool = this.options.defaultTool;
      this.actions = [];
      this.action = [];
      this.canvas.bind('click mousedown mouseup mousemove mouseleave mouseout touchstart touchmove touchend touchcancel', this.onEvent);
      if (this.options.toolLinks) {
        $('body').delegate("a[href=\"#" + (this.canvas.attr('id')) + "\"]", 'click', function(e) {
          var $canvas, $this, key, sketch, _i, _len, _ref;
          $this = $(this);
          $canvas = $($this.attr('href'));
          sketch = $canvas.data('sketch');
          _ref =...