This creates a dynamic-sized color scheme, linearly interpolated between the two given colors
Last active
May 21, 2018 01:29
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Resizable color palette
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
<title></title> | |
<style type="text/css" media="screen"> | |
div.block { | |
width:60px; | |
height: 60px; | |
float: left; | |
margin: 1px; | |
} | |
</style> | |
</head> | |
<body> | |
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> | |
<script src="http://d3js.org/d3.v3.js"></script> | |
<input type="number" id="numBins" value="12" min="0"> <br/> | |
<div id='frame'> | |
<script type="text/javascript"> | |
var frame, blocks, binner, numBins; | |
frame = d3.select(document.getElementById("frame")); | |
binner = document.getElementById('numBins'); | |
var update = function() { | |
numBins = Number(binner.value); | |
color = d3.scale.linear().domain([1,numBins]) | |
.interpolate(d3.interpolateLab) | |
.range([d3.rgb("#007AFF"), d3.rgb('#FFF500')]); | |
blocks = document.getElementsByClassName('block'); | |
if (blocks.length > numBins) { | |
for (var i = blocks.length; i > numBins; i--) { | |
blocks[i-1].remove(); | |
} | |
} else if (blocks.length < numBins) { | |
for (var i=blocks.length; i < numBins; i++) { | |
frame.append('div').attr('class', 'block'); | |
} | |
} | |
blocks = document.getElementsByClassName('block'); | |
for (var i = Math.max(blocks.length, numBins)-1; i >= 0; i--) { | |
d3.select(blocks[i]).attr('style', function(d) { | |
return 'background-color: ' + color(i); | |
}); | |
} | |
}; | |
binner.onchange = update; | |
binner.onclick = update; | |
update(); | |
</script> | |
</div> | |
</body> | |
</html> |
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