index.html

## readme.md

      
        

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              readme.md
            
          
        
      
    
  
    Mousing near the right edge scrolls right; mousing near the left edge scrolls left.

Photo by Fir0002/Flagstaffotos.

  

  

## index.html
<!DOCTYPE html>
<meta charset="utf-8">

<style>

body {
  margin: 0;
}

.gallery {
  overflow-x: scroll;
}

.gallery-inner {
  width: 300%;
  height: 100%;
}

.gallery-inner img {
  width: 100%;
}

</style>

<body>

  <div class="gallery">
    <div class="gallery-inner">
      <img src="panorama.jpg">
    </div>
  </div>

</body>

<script src="http://d3js.org/d3.v4.0.0-alpha.35.min.js" charset="utf-8"></script>
<script>

var gallery = document.querySelector('.gallery')

// scale from mouse position as fraction of gallery width
// to how many pixels to scroll per render frame
var scrollScale = d3.scaleLinear()
  .domain([0,.2,.8,1])
  .range([-100,0,0,100])

// default to stationary
var mousePosition = .5

// on mousemove, save mouse position fraction
d3.select(gallery).on('mousemove', function() {
  mousePosition = d3.mouse(this)[0] / this.offsetWidth
})

// scroll according to last known mouse position
d3.timer(function() {
  gallery.scrollLeft += scrollScale(mousePosition)
})

</script>

## panorama.jpg

      
        

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              panorama.jpg
            
          
        
      
    

  
      
          
      
  

  

## thumbnail.png

      
        

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              thumbnail.png