This is an example of small multiples with bar charts. The bar chart is implemented with rect SVG element.
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April 30, 2016 06:27
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Small multiples with rect bar charts
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
svg { | |
font: 10px sans-serif; | |
padding: 10px; | |
} | |
.frame { | |
shape-rendering: crispEdges; | |
} | |
.frame { | |
fill: none; | |
stroke: #aaa; | |
stroke-opacity: 0.75; | |
stroke-width: 0.5; | |
} | |
.feature-cell { | |
} | |
.feature-render { | |
fill-opacity: 0.75; | |
stroke-width: 0; | |
} | |
.feature-render:hover { | |
fill-opacity: 1; | |
stroke-width: 0.5; | |
stroke: #666; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script> | |
var width = 960, | |
size = 150, | |
cw = 80, //cell width | |
ch = 20, //cell hight | |
padding = 4, | |
nCol = 10; //Math.floor((width - padding) / size); | |
var color = d3.scale.category20(); | |
var x = d3.scale.linear() | |
.range([padding / 2, cw - padding / 2]); | |
var y = d3.scale.linear() | |
.range([ch - padding / 2, padding / 2]); | |
function generateData(nFeatures, mBins) { | |
return d3.range(nFeatures).map(function(i) { | |
return { | |
"name": "feature" + i, | |
"col": i % nCol, | |
"row": Math.floor(i / nCol), | |
"bins": d3.range(mBins).map(function(j) { | |
return Math.random(); | |
}) | |
}; | |
}); | |
} | |
var fdata = generateData(100, 12); | |
//console.log("fdata", fdata); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", ch * (Math.floor(fdata.length / nCol) + 1) + padding) | |
.append("g") | |
.attr("transform", "translate(" + padding + "," + padding / 2 + ")"); | |
var cell = svg.selectAll(".feature-cell") | |
.data(fdata) | |
.enter().append("g") | |
.attr("class", "feature-cell") | |
.attr("transform", function(d) { | |
return "translate(" + d.col * cw + "," + d.row * ch + ")"; | |
}) | |
.each(featurePlot); | |
function featurePlot(f) { | |
var _cell = d3.select(this); | |
_cell.append("rect") | |
.attr("class", "frame") | |
.attr("x", padding / 2) | |
.attr("y", padding / 2) | |
.attr("width", cw - padding) | |
.attr("height", ch - padding); | |
x.domain([0, f.bins.length - 1]); | |
y.domain([0, 1]); | |
var n = f.bins.length, | |
bw = ((cw - padding) / (n + 1)).toFixed(1); //bar width based on the # of bins and cell width; (n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width); | |
var bars = _cell.selectAll(".feature-render") | |
.data(f.bins) | |
.enter() | |
.append("rect") | |
.attr("class", "feature-render") | |
.attr("x", function(d, i){ | |
// n/(n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width); | |
return x(i * n / (n + 1)); | |
}) | |
.attr("y",y(0)) | |
.attr("height", 0) | |
.attr("width", bw) | |
.style("fill", function() { | |
return color(f.name); | |
}); | |
bars.transition() | |
.duration(750) | |
.attr("y", function(d, i){ | |
return y(0)-y(d); | |
}) | |
.attr("height", function(d,i){ | |
return y(d); | |
}); | |
} | |
d3.select(self.frameElement).style("height", ch * (Math.floor(fdata.length / nCol) + 1) + padding + 20 + "px"); | |
</script> | |
</body> | |
</html> |
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