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steamgraph.js
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steamgraph.js
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// Author: Mike Dezube <michael dezube at gmail dot com>
// Thank you to all who posted snippets on bl.ocks.org that helped make this possible.
// Not intended to be used directly, see createSteamgraph() for usage.
function steamgraph(data, opt_color) {
var colors = colorbrewer[opt_color || "Spectral"][9];
return {
initLayout: function() {
var boundingRect = d3.select(".chart").node()
.getBoundingClientRect();
this.margin = {
top: 20,
right: 45,
bottom: 20,
left: 45
};
this.width = boundingRect.width - this.margin.left - this.margin.right;
this.height = boundingRect.height - this.margin.top - this.margin.bottom;
this.svg = d3.select(".chart")
.append("svg")
.attr("width", this.width + this.margin.left + this.margin.right)
.attr("height", this.height + this.margin.top + this.margin.bottom)
.append("g")
.attr("transform", "translate(" + this.margin.left + "," + this.margin.top + ")");
},
initScales: function() {
this.xScale = d3.time.scale()
.range([0, this.width]);
this.yScale = d3.scale.linear()
.range([this.height - 10, 0]);
this.colorScale = d3.scale.ordinal()
.range(colors);
},
initAxes: function() {
this.xAxis = d3.svg.axis()
.scale(this.xScale)
.orient("bottom")
.tickFormat(steamgraph.READABLE_DATE_FORMAT);
this.yAxis = d3.svg.axis()
.scale(this.yScale);
},
drawTooltipAndBar: function() {
this.tooltip = d3.select(".chart")
.append("div")
.style("position", "absolute")
.style("z-index", "25")
.style("visibility", "hidden")
.style("top", "30px")
.style("left", "155px");
this.verticalBar = d3.select(".chart")
.append("div")
.style("position", "absolute")
.style("z-index", "20")
.style("visibility", "hidden")
.style("width", "1px")
.style("top", this.margin.top + 100 + "px")
.style("bottom", this.margin.bottom + 100 + d3.select(".x.axis").node().getBoundingClientRect().height + "px")
.style("height", "auto")
.style("background", "#686868");
},
createLayersAndSetDomains: function() {
this.layers = steamgraph.stacker(steamgraph.nester.entries(data));
this.xScale.domain(d3.extent(data, function(d) {
return d.date;
}));
this.yScale.domain([0, d3.max(data, function(d) {
return d.y0 + d.y;
})]);
},
drawLayers: function() {
// Rebind since within the subfunctions "this" will mean something else.
var xScale = this.xScale;
var yScale = this.yScale;
var colorScale = this.colorScale;
var areaCreator = d3.svg.area()
.interpolate("cardinal")
.x(function(d) {
return xScale(d.date);
})
.y0(function(d) {
return yScale(d.y0);
})
.y1(function(d) {
return yScale(d.y0 + d.y);
});
this.svg.selectAll(".layer")
.data(this.layers)
.enter().append("path")
.attr("class", "layer")
.attr("d", function(d) {
return areaCreator(d.values);
})
.style("fill", function(d, i) {
return colorScale(i);
})
.attr("opacity", 1);
},
drawAxes: function() {
this.svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + this.height + ")")
.call(this.xAxis);
this.svg.append("g")
.attr("class", "y axis")
.attr("transform", "translate(" + this.width + ", 0)")
.call(this.yAxis.orient("right"));
this.svg.append("g")
.attr("class", "y axis")
.call(this.yAxis.orient("left"));
},
wireUpMouseListeners: function() {
// Rebind since within the callbacks "this" will mean something else.
var svg = this.svg;
var xScale = this.xScale;
var tooltip = this.tooltip;
var verticalBar = this.verticalBar;
var marginLeft = this.margin.left;
svg.selectAll(".layer")
.on("mouseover", function(d, hoveredLayerIndex) {
svg.selectAll(".layer")
.transition().duration(200)
.attr("opacity", function(d, j) {
// Fade out all but the selection layer.
return hoveredLayerIndex != j ? 0.1 : 1;
})
})
.on("mousemove", function(d, i) {
var xCoord = d3.mouse(this)[0];
var xValueAsTimeStamp = new Date(xScale.invert(xCoord)).getTime();
var valuesForLayer = d.values;
var smallestDiff = Number.MAX_SAFE_INTEGER;
var smallestDiffIdx = -1;
// Finds the closest x value to the hovered point.
// TODO convert to binary search
for (var xIdx = 0; xIdx < valuesForLayer.length; xIdx++) {
var diff = Math.abs(valuesForLayer[xIdx].date.getTime() - xValueAsTimeStamp);
if (diff < smallestDiff) {
smallestDiff = diff;
smallestDiffIdx = xIdx;
}
}
d3.select(this)
.attr("stroke", "black")
.attr("stroke-width", "0.4px"),
tooltip.html(
"<p>Person: " + d.key + "<br>" +
" Date Bucket: " + steamgraph.READABLE_DATE_FORMAT(valuesForLayer[smallestDiffIdx].date) + "<br>" +
" Texts in Bucket: " + valuesForLayer[smallestDiffIdx].value + "</p>" +
" Texts Total: " + steamgraph.COMMA_FORMAT(
d3.sum(valuesForLayer, function(x) {
return x.value;
})) + "</p>"
).style("visibility", "visible");
// Running in iPython we'll have jQuery() so just use that to call position().left.
// We add 4px to the location so the mouse is never actually over the bar and
// doesn't triggger the mouseout listener.
verticalBar
.style("left", xCoord + marginLeft + $('.chart').position().left + 4 + "px")
.style("visibility", "visible")
})
.on("mouseout", function(d, i) {
svg.selectAll(".layer")
.transition()
.duration(200)
.attr("opacity", "1");
d3.select(this)
.attr("stroke-width", "0px")
})
}
};
}
/**
* Draws a steamgraph with data in the passed CSV. The CSV must have the format of:
* date,key,value
* YYYY/MM,John Doe,# texts exchanged in this month
* YYYY/MM,Jane Doe,# texts exchanged in this month
*
* The streamgraph is drawn with the color palette from colorbrewer.js named by opt_color, or
* defaults to the 'Spectral' color palette.
*
* This method requires there be a div with class 'chart' with a width and height set in which to
* draw the steamgraph.
*/
function createSteamgraph(csvAsString, opt_color) {
var data = d3.csv.parse(csvAsString, function(data) {
return {
key: data.key,
date: d3.time.format("%Y/%m").parse(data.date),
value: parseInt(data.value)
}
});
steamgraph.READABLE_DATE_FORMAT = d3.time.format("%b '%y");
steamgraph.COMMA_FORMAT = d3.format("0,000");
steamgraph.stacker = d3.layout.stack()
.offset("wiggle")
.values(function(d) {
return d.values;
})
.x(function(d) {
return d.date;
})
.y(function(d) {
return d.value;
});
steamgraph.nester = d3.nest()
.key(function(d) {
return d.key;
});
var mySteamgraph = new steamgraph(data, opt_color)
mySteamgraph.initLayout();
mySteamgraph.initScales();
mySteamgraph.initAxes();
mySteamgraph.createLayersAndSetDomains();
mySteamgraph.drawLayers();
mySteamgraph.drawAxes();
mySteamgraph.drawTooltipAndBar();
mySteamgraph.wireUpMouseListeners();
}