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              <canvas id="matisse"></canvas>

<div id="menu"> 
  
  <div class="tray">
    <button class="clear">Clear</button>
    <button class="save">Save</button>
  </div>
</div>
            
          
!
            
              * { margin: 0; padding: 0; }
body {  overflow: hidden; }

#menu { position: absolute; top: 10px; right: 10px; }
            
          
!
            
              $(function(){
  
  // initialize drawing status
  var shape = {
    status: false,
    color: 'rgba(34,121,192,.85)',
    shadowColor: 'rgba(34,121,192,1)',
    startX: 0,
    startY: 0,
    coords: []
  };
  
  // get the menu and buttons
  var $menu = $('#menu');
  var $buttonClear = $('#menu .clear');
  var $buttonSave = $('#menu .save');
  
  // get the canvas, set to full width
  var canvas = $('canvas')[0];
  canvas.width = $(document).width();
  canvas.height = $(document).height();
    
  // get the context
  var ctx = canvas.getContext('2d');
  
  // fill the initial canvas
  ctx.fillStyle = "#fffff3";
  ctx.fillRect(0,0,canvas.width,canvas.height);
  
  // set the click event to start drawing
  $(canvas).click(function(e){
       
    // 1. get the x,y just clicked
    var currentX = e.clientX;
    var currentY = e.clientY;
    
    // 2. if shape not drawn yet, set init values, hide menu, and draw start
    if ( !shape.status ) {
      
      $menu.hide();

      // set fill, stroke, and shadow styles
      ctx.fillStyle = shape.color;
      ctx.strokeStyle = shape.color;
      ctx.lineWidth = 1;
      ctx.shadowOffsetX = 0;
      ctx.shadowOffsetY = 0; 
      ctx.shadowBlur = 1;
      ctx.shadowColor = shape.shadowColor;
      
      // draw the shape
      shape.status = true;
      shape.startX = currentX;
      shape.startY = currentY;
      ctx.beginPath();
      ctx.moveTo(currentX, currentY);
      ctx.fillRect(currentX, currentY, 2, 2);
    }
    
    // 3. else, we can draw a line of our shape...
    else {
      
      // 3.a get the previous x,y clicked
      var lastX = shape.coords[shape.coords.length - 1][0];
      var lastY = shape.coords[shape.coords.length - 1][1];
      
      // 3.b draw the line
      ctx.lineTo(currentX, currentY);
      ctx.stroke();
      
      // 3.c if this is within 10px of the initial coordinate and there are less than three points in the shape so far, close it and fill the shape and show menu again
      if ( Math.abs( shape.startX - currentX ) < 11 && Math.abs( shape.startY - currentY ) < 11 && shape.coords.length > 2 ) {
                
        ctx.lineTo( shape.startX, shape.startY);
        ctx.closePath();
        ctx.stroke();
        ctx.fill();
        
        $menu.show();
        
        
        // reset shape and wash your hands of it
        shape.status = false; 
        shape.coords = [];
        return;
      }
    }
    
    // 4. add this coordinate to our array
    shape.coords.push([currentX,currentY]);        
  });
  
  // clear canvas when clear button clicked
  $buttonClear.click(function(){
    ctx.fillStyle = "#fffff3";
    ctx.fillRect(0,0,canvas.width,canvas.height);
  });
  
  // open png in new window when save button clicked
  $buttonSave.click(function(){
    window.open(canvas.toDataURL('image/png'));
  });
  
})
            
          
!
999px
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