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diethardsteiner/d3_line_chart_with_events.html

Last active August 29, 2015 14:07
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d3js line chart with event information
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d3_line_chart_with_events.html
<!-- line chart code mostly based on http://bl.ocks.org/mbostock/3883245 -->
<!-- event/campaign highlight code by Diethard Steiner -->
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
.eventlineborder {
stroke-width:1;
stroke-dasharray: 5, 3, 9, 2;
}
.eventlineconnector {
stroke-width:1;
}
.eventtitle {
font-family: Verdana;
font-size: 10px;
letter-spacing: 2px;
text-anchor: middle;
</style>
<body>
<script src="http://d3js.org/d3.v3.js"></script>
<script>
var data = [
{"date": "1-May-12", "close": 582.13},
{"date": "30-Apr-12", "close": 583.98},
{"date": "27-Apr-12", "close": 603.00},
{"date": "26-Apr-12", "close": 607.70},
{"date": "25-Apr-12", "close": 610.00},
{"date": "24-Apr-12", "close": 560.28},
{"date": "23-Apr-12", "close": 571.70},
{"date": "20-Apr-12", "close": 572.98},
{"date": "19-Apr-12", "close": 587.44}
];
var margin = {top: 20, right: 20, bottom: 70, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var parseDate = d3.time.format("%d-%b-%y").parse;
var x = d3.time.scale()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
var line = d3.svg.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.close); });
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 + ")");
data.forEach(function(d) {
d.date = parseDate(d.date);
d.close = +d.close;
});
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain(d3.extent(data, function(d) { return d.close; }));
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Price ($)");
svg.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
// EVENT
var eventData = [
{"name": "Summer Event", "startdate": "20-Apr-12", "enddate": "23-Apr-12", "color": "#289615"},
{"name": "Refresh Event", "startdate": "22-Apr-12", "enddate": "24-Apr-12", "color": "#BB70C2"},
{"name": "Special Event", "startdate": "28-Apr-12", "enddate": "30-Apr-12", "color": "#D99332"}
];
// convert to proper JS date format
eventData.forEach(function(d) {
d.startdate = parseDate(d.startdate);
d.enddate = parseDate(d.enddate);
});
var eventHeight = function(d, i) { return (i % 2) ? height + 25 : height + 45 };
var eventInd = svg.selectAll(".eventInd")
.data(eventData)
.enter()
.append("g")
.attr("class", "eventInd")
;
eventInd.append("line")
.attr("x1", function(d) { return x(d.startdate); })
.attr("y1", 0)
.attr("x2", function(d) { return x(d.startdate); })
.attr("y2", function(d, i) { return eventHeight(d, i); })
.attr("stroke", function(d) { return d.color; })
.attr("class","eventlineborder")
;
// draw a line: end event
eventInd.append("line")
.attr("x1", function(d) { return x(d.enddate); })
.attr("y1", 0)
.attr("x2", function(d) { return x(d.enddate); })
.attr("y2", function(d, i) { return eventHeight(d, i); })
.attr("stroke", function(d) { return d.color; })
.attr("class","eventlineborder")
;
// draw a line: period connector event
eventInd.append("line")
.attr("x1", function(d) { return x(d.startdate); })
.attr("y1", function(d, i) { return eventHeight(d, i); })
.attr("x2", function(d) { return x(d.enddate); })
.attr("y2", function(d, i) { return eventHeight(d, i); })
.attr("stroke", function(d) { return d.color; })
.attr("class","eventlineconnector")
;
// add event label
eventInd.append("text")
.attr("x", function(d) { return x(d.startdate) + ((x(d.enddate) - x(d.startdate))/2); })
.attr("y", function(d, i) { return eventHeight(d, i) + 12; })
.attr("class", "eventtitle")
.attr("stroke", function(d) { return d.color; })
.text(function(d) { return d.name; })
;
</script>
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