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Last active April 30, 2016 06:40
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Transit small multiples from area charts to path bar charts
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README.md

This is an example to transit small multiples from area charts to bar charts. The bar charts are implemented with path, not rect SVG element.

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index.html
<!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 {
opacity: 0.6;
}
.feature-cell:hover {
opacity: 1;
}
.feature-render {
*fill: lightsteelblue;
fill-opacity: 0.6;
stroke-width: 0;
}
.feature-line {
*stroke: lightsteelblue;
stroke-opacity: 1;
stroke-width: 1;
fill-opacity: 0;
}
</style>
<body>
<input name="btnToBar" type="button" value="Bar" onclick="toBar()" />
<input name="btnToArea" type="button" value="Area" onclick="toArea()" />
<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]);
var farea = d3.svg.area()
.interpolate("basis")
.x(function(d, i) {
return x(i);
})
.y0(ch - padding / 2)
.y1(function(d) {
return y(d);
});
var farea0 = d3.svg.area()
.interpolate("basis")
.x(function(d, i) {
return x(i);
})
.y0(ch - padding / 2)
.y1(function(d) {
return y(0);
});
var fline = d3.svg.line()
.interpolate("basis")
.x(function(d, i) {
return x(i);
})
.y(function(d) {
return y(d);
});
var fline0 = d3.svg.line()
.interpolate("basis")
.x(function(d, i) {
return x(i);
})
.y(function(d) {
return y(0);
});
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]);
_cell.append("path")
.datum(f.bins)
.attr("class", "feature-render")
.style("fill", function() {
return color(f.name);
})
//.style("stroke", function() {return color(f.name);})
.attr("d", farea0)
.transition()
.duration(750)
.attr("d", farea);
_cell.append("path")
.datum(f.bins)
.attr("class", "feature-line")
.style("stroke", function() {
return color(f.name);
})
.attr("d", fline0)
.transition()
.duration(750)
.attr("d", fline);
}
d3.select(self.frameElement).style("height", ch * (Math.floor(fdata.length / nCol) + 1) + padding + 20 + "px");
function pathBar(bins) {
var path = [],
i = -1,
n = bins.length,
d,
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);
while (++i < n) {
d = bins[i];
path.push("M", x(i * n / (n + 1)), ",", y(0), "V", y(d), "h", bw, "V", y(0)); //
// n/(n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width);
// y(0) is actually at the bottom: ch - padding / 2
}
return path.join("");
}
function pathBar0(bins) {
var path = [],
i = -1,
n = bins.length,
d,
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);
while (++i < n) {
d = bins[i];
path.push("M", x(i * n / (n + 1)), ",", y(0), "V", y(0), "h", bw, "V", y(0)); //
// n/(n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width);
// y(0) is actually at the bottom: ch - padding / 2
}
return path.join("");
}
function toBar() {
//alert("clicked");
d3.selectAll(".feature-render")
.transition()
.duration(750)
.attr("d", farea0)
.each("end", function() {
d3.select(this)
.attr("d", pathBar0)
.transition()
.duration(750)
.attr("d", pathBar);
});
d3.selectAll(".feature-line")
.transition()
.duration(750)
.attr("d", fline0);
}
function toArea() {
//alert("clicked");
d3.selectAll(".feature-render")
.transition()
.duration(750)
.attr("d", pathBar0)
.each("end", function() {
d3.select(this)
.attr("d", farea0)
.transition()
.duration(750)
.attr("d", farea);
});
d3.selectAll(".feature-line")
.transition()
.duration(750)
.attr("d", fline);
}
</script>
</body>
</html>
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