mbostock/.block

## .block
license: gpl-3.0

## README.md

      
        

                
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              README.md
            
          
        
      
      
    Rainbow color scales are harmful. Please use a perceptually-optimized color scale instead.

  

  

## readme.png

      
        

                
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              readme.png
            
          
        
      
    
    

        
            
        
    

  

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500;

var color = d3.scale.linear()
    .domain([0, 255])
    .range(["hsl(0,80%,50%)", "hsl(360,80%,50%)"])
    .interpolate(d3.interpolateString);

var canvas = d3.select("body").append("canvas")
    .attr("width", width)
    .attr("height", height);

var context = canvas.node().getContext("2d");

getImage("readme.png", function(error, image) {
  if (error) throw error;
  context.drawImage(image, 0, 0, width, height);
  image = context.getImageData(0, 0, width, height);

  // Rescale the colors.
  for (var c, i = 0, n = width * height * 4, d = image.data; i < n; i += 4) {
    c = d3.rgb(color(d[i]));
    d[i + 0] = c.r;
    d[i + 1] = c.g;
    d[i + 2] = c.b;
  }

  context.putImageData(image, 0, 0);
});

function getImage(path, callback) {
  var image = new Image;
  image.onload = function() { callback(null, image); };
  image.onerror = callback;
  image.src = path;
}

</script>

## thumbnail.png

      
        

                
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              thumbnail.png
	<!DOCTYPE html>
	<meta charset="utf-8">
	<body>
	<script src="//d3js.org/d3.v3.min.js"></script>
	<script>

	var width = 960,
	height = 500;

	var color = d3.scale.linear()
	.domain([0, 255])
	.range(["hsl(0,80%,50%)", "hsl(360,80%,50%)"])
	.interpolate(d3.interpolateString);

	var canvas = d3.select("body").append("canvas")
	.attr("width", width)
	.attr("height", height);

	var context = canvas.node().getContext("2d");

	getImage("readme.png", function(error, image) {
	if (error) throw error;
	context.drawImage(image, 0, 0, width, height);
	image = context.getImageData(0, 0, width, height);

	// Rescale the colors.
	for (var c, i = 0, n = width * height * 4, d = image.data; i < n; i += 4) {
	c = d3.rgb(color(d[i]));
	d[i + 0] = c.r;
	d[i + 1] = c.g;
	d[i + 2] = c.b;
	}

	context.putImageData(image, 0, 0);
	});

	function getImage(path, callback) {
	var image = new Image;
	image.onload = function() { callback(null, image); };
	image.onerror = callback;
	image.src = path;
	}

	</script>