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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 id="clear">Clear</button>
      <button id="save">Save</button>
    </div>
  </div>
</div>
            
          
!
            
              body {  overflow: hidden; 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 = document.getElementById('upload-image');
  var frameContainer = document.getElementById('frame-container');
  var canvas = document.getElementById('frame-canvas');
  var ctx = canvas.getContext('2d');

  var buttonClear = document.getElementById('clear');
  var buttonSave = document.getElementById('save');
  
  var pixelSize = 15;
  var framePixelWidth;

  /** HELPER FUNCTIONS **/
  
  var calculateFrameSize = function(dimension) {
    // returns computer-pixel width of frame
    var size = pixelSize * Math.ceil( (dimension * .1) / pixelSize) ;
    return size;
  };
  
  /** EVENTS **/

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

    // embed image onto canvas
    var uploadedImage = uploadInput.files[0];
    var reader = new FileReader();
    reader.onload = function(e){
      var img = new Image();
      img.onload =function() {
        
        // calculate frame width off of smallest dimension
        var 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);
      }
      img.src = e.target.result;
    };
    reader.readAsDataURL(uploadedImage);

    // show sketch container
    frameContainer.style.display = "block";
  };

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

    frameContainer.style.display = 'none';
  };

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

}());
            
          
!
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