Update a donut chart extent based on a dragged brush extent
Created
April 7, 2014 21:35
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brush pie
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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; | |
} | |
.brush .resize path { | |
fill: #e2e3e3; | |
stroke: #3c4745; | |
} | |
</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; | |
radius = Math.min(width, height) / 2; | |
//brush stuff: | |
var x = d3.scale.linear() | |
.domain([0,100]) | |
.range([0, width]); | |
var brush = d3.svg.brush() | |
.x(x) | |
.extent([0,40]) | |
.on("brush", 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); | |
gBrush.selectAll("rect") | |
.style("pointer-events","none") | |
.attr("y", -1) | |
.attr("height", height); | |
gBrush.selectAll(".resize.e") | |
.append("image") | |
.attr("width", 35) | |
.attr("height",35) | |
.attr("y",height/2.1) | |
.attr("x",-17) | |
.attr("xlink:href",'arrow_right.png'); | |
function brushended() { | |
//Returns the brush extent at the JS console: | |
console.log(Math.round(brush.extent()[1])) | |
path.select('.donutPath') | |
.data(pie([brush.extent()[1],100 - brush.extent()[1]])) | |
.enter().append("path") | |
.attr("fill", function(d, i) { return color(i); }) | |
.attr("d", arc); | |
} | |
// end brush stuff | |
// donut stuff: | |
var color = d3.scale.category20(); | |
var pie = d3.layout.pie() | |
.sort(null); | |
var arc = d3.svg.arc() | |
.innerRadius(radius - 100) | |
.outerRadius(radius - 70); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.append("g") | |
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
var path = svg.selectAll("path") | |
.attr("class","donutPath") | |
.data(pie([brush.extent()[1],100 - brush.extent()[1]])) | |
.enter().append("path") | |
.attr("fill", function(d, i) { return color(i); }) | |
.attr("d", arc); | |
</script> |
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