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              <div id="container">
  <p>
    <label for="upload-image">1. upload an image</label>
    <input type="file" id="upload-image" name="upload-image" />
  </p>

  <p id="frame-container">
    <canvas id="frame-canvas"></canvas>
  </p>
</div>

<div id="menu"> 

  <div class="tray">
    <p><a href="index.html">SEURAT.EXTEND()<br /> a <code>var t;</code> demo</a></p>
    <p><small>upload an image, get an art<br /><a href="index.html">learn about  george-pierre seurat</a></small></p>
    <div>
      <button class="clear">Clear</button>
      <button class="save">Save</button>
    </div>
  </div>
</div>
            
          
!
            
              body { font-family: Helvetica; padding: 1em; }

#container p { margin: 0 0 2em; }
label { font-weight: bold; text-transform: uppercase; font-size: 1.5em; display: block; margin: .5em 0; }

#menu { position: absolute; top: 10px; right: 10px; text-align: right;   }
#menu a { text-decoration: none; color: black; font-weight: bold; font-size: 1.2em; }
#menu p { margin-bottom: 10px; }
#menu small { font-family: monospace; }

.hide { display: none; }
            
          
!
            
              $(function(){

  var $uploadInput = $('#upload-image');
  var $frameContainer = $('#frame-container');
  var canvas = $('#frame-canvas')[0];
  var ctx = canvas.getContext('2d');

  var $buttonClear = $('button.clear');
  var $buttonSave = $('button.save');
  
  var pixelSize = 15;
  var frameSize;

  /** HELPER FUNCTIONS **/
  
  var calculateFrameSize = function(dimension) {
    // returns computer-pixel width of frame
    var size = pixelSize * Math.ceil( (dimension * .1) / pixelSize) ;
    return size;
  };
  
  var drawFrameDiagonal = function(x,y,color) {
    // only draw if pixel is outside of image
    if ( 
      x < frameSize || 
      y < frameSize ||
      x >= canvas.width - frameSize - 1 ||
      y >= canvas.height - frameSize - 1
    ) {
      ctx.fillStyle = color;
      ctx.fillRect(x, y, pixelSize, pixelSize);
    }
    
    x = x + pixelSize;
    y = y - pixelSize;

    if (x >= 0 && y >= 0) {
      drawFrameDiagonal(x,y);
    }
  };
  
  var drawFrame = function() {
    for (var y = 0; y <= canvas.height; y = y + pixelSize) {
      drawFrameDiagonal(0, y, 'cyan');
    }

    for (var x = pixelSize; x <= canvas.width; x = x + pixelSize) {
      drawFrameDiagonal(x, canvas.height - pixelSize, 'lime');
    }
  };
  
  /** EVENTS **/

  // when uploading an image, embed it onto canvas and show it
  $uploadInput.change(function(){

    // embed image onto canvas
    var uploadedImage = $uploadInput[0].files[0];
    var reader = new FileReader();
    reader.onload = function(e){
      var img = new Image();
      img.onload =function() {
       
        // resize image to fit grid
        img.width = img.width - (img.width % pixelSize);
        img.height = img.height - (img.height % pixelSize);
        
        // calculate frame width off of smallest dimension
        frameSize = calculateFrameSize(Math.min(img.width, img.height));
        canvas.style.backgroundColor = 'hotpink';
        canvas.width = img.width + 2 * frameSize;
        canvas.height = img.height + 2 * frameSize;
        ctx.drawImage(img,frameSize,frameSize);
        
        drawFrame();
      }
      img.src = e.target.result;
    };
    reader.readAsDataURL(uploadedImage);

    // show sketch container
    $frameContainer.removeClass('hide');
  });

  // clear canvas when clear button clicked
  $buttonClear.click(function(){
    ctx.fillStyle = "#ffffff";
    ctx.fillRect(0,0,canvas.width,canvas.height);

    $frameContainer.addClass('hide');
  });

  // open png in new window when save button clicked
  $buttonSave.click(function(){
    window.open(canvas.toDataURL('image/png'));
  });

});
            
          
!
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