This is the code for Chapter 11, Figure 12 from D3.js in Action demonstrating d3.svg.brush() XY-brushing as well as a simple selection of elements that fall within the region brushed.
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March 17, 2016 02:25
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Ch. 11, Fig. 12 - D3.js in Action
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<html> | |
<head> | |
<title>D3 in Action Chapter 11 - Example 7</title> | |
<meta charset="utf-8" /> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
</head> | |
<style> | |
body, html { | |
margin: 0; | |
} | |
canvas { | |
position: absolute; | |
width: 500px; | |
height: 500px; | |
} | |
svg { | |
position: absolute; | |
width:500px; | |
height:500px; | |
} | |
path.country { | |
fill: gray; | |
stroke-width: 1; | |
stroke: black; | |
opacity: .5; | |
} | |
path.sample { | |
stroke: black; | |
stroke-width: 1px; | |
fill: red; | |
fill-opacity: .5; | |
} | |
line.link { | |
stroke-width: 1px; | |
stroke: black; | |
stroke-opacity: .5; | |
} | |
circle.node { | |
fill: red; | |
stroke: white; | |
stroke-width: 1px; | |
} | |
circle.xy { | |
fill: pink; | |
stroke: black; | |
stroke-width: 1px; | |
} | |
rect.extent { | |
fill-opacity:.1; | |
stroke: black; | |
stroke-width: 1px; | |
} | |
</style> | |
<body> | |
<canvas height="500" width="500"></canvas> | |
<div id="viz"> | |
<svg></svg> | |
</div> | |
</body> | |
<footer> | |
<script> | |
sampleData = d3.range(3000).map(function(d) { | |
var datapoint = {}; | |
datapoint.id = "Sample Node " + d; | |
datapoint.x = Math.random() * 500; | |
datapoint.y = Math.random() * 500; | |
return datapoint; | |
}) | |
d3.select("svg").selectAll("circle").data(sampleData) | |
.enter() | |
.append("circle") | |
.attr("r", 3) | |
.attr("cx", function(d) {return d.x}) | |
.attr("cy", function(d) {return d.y}) | |
.style("fill", "pink") | |
.style("stroke", "black") | |
.style("stroke-width", "1px") | |
var brush = d3.svg.brush() | |
.x(d3.scale.identity().domain([0, 500])) | |
.y(d3.scale.identity().domain([0, 500])) | |
.on("brush", brushed); | |
d3.select("svg").call(brush); | |
function brushed() { | |
var e = brush.extent(); | |
d3.selectAll("circle") | |
.style("fill", function (d) { | |
if (d.x >= e[0][0] && d.x <= e[1][0] && d.y >= e[0][1] && d.y <= e[1][1]) { | |
return "darkred"; | |
} | |
else { | |
return "pink"; | |
} | |
}) | |
} | |
</script> | |
</footer> | |
</html> |
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