I put together a stripped-down version of a D3 brush selector to serve as a pallette for chart interactivity. I'll use it as a controller for other visualization interactions, like sliding extent on a pie chart or time range on a map.
Created
April 7, 2014 19:14
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A Lonely Brush
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.axis path { | |
display: none; | |
} | |
.axis line { | |
display: none; | |
} | |
.grid-background { | |
fill: #e2e3e3; | |
} | |
.grid line, | |
.grid path { | |
display: none; | |
} | |
.brush .extent { | |
fill:#3300ff; | |
fill-opacity: .125; | |
shape-rendering: crispEdges; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script> | |
var margin = {top: 20, right: 40, bottom: 20, left: 40}, | |
width = 500 - margin.left - margin.right, | |
height = 400 - margin.top - margin.bottom; | |
var x = d3.scale.linear() | |
.domain([0,100]) | |
.range([0, width]); | |
var brush = d3.svg.brush() | |
.x(x) | |
.extent([30,70]) | |
.on("brushend", brushended); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width + margin.left + margin.right) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
svg.append("rect") | |
.attr("class", "grid-background") | |
.attr("width", width) | |
.attr("height", height); | |
svg.append("g") | |
.attr("class", "x grid") | |
.attr("transform", "translate(0," + height + ")"); | |
svg.append("g") | |
.attr("class", "x axis") | |
.attr("transform", "translate(0," + height + ")"); | |
var gBrush = svg.append("g") | |
.attr("class", "brush") | |
.call(brush); | |
gBrush.selectAll("rect") | |
.attr("height", height); | |
function brushended() { | |
//Returns the brush extent at the JS console: | |
console.log(Math.round(brush.extent()[0]) + "," + Math.round(brush.extent()[1])) | |
} | |
</script> |
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