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@kpq
Created January 31, 2016 15:38
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Barley Yields, University Farm
<!DOCTYPE html>
<meta charset="utf-8">
<style type="text/css">
/*css to go here*/
body {
font-family: arial;
font-size: 12px;
}
.g-chart-container {
width:350px;
margin:10px 0;
}
.g-location {
text-align: center;
font-weight: bold;
font-size:14px;
margin: 3px 0;
}
.g-variety-group.g-increasing line {
stroke:#7FA4CE;
}
.g-variety-group.g-decreasing line {
stroke: #BE6C8D;
}
.g-variety-group.g-decreasing circle {
fill: #BE6C8D;
}
.g-variety-group.g-increasing circle {
fill: #7FA4CE;
}
circle.g-1931-yield {
stroke: #000; ;
fill: #fff !important;
}
.g-variety-group line {
stroke: #ccc;
stroke-width: 4px;
}
.axis line {
fill: none;
stroke: #ccc;
stroke-dasharray: 2px 3px;
shape-rendering: crispEdges;
stroke-width: 1px;
}
.axis text {
font-family: arial, sans-serif;
font-size: 12px;
pointer-events: none;
fill: #777;
}
.domain {
display: none;
}
.y.axis text {
text-anchor: end !important;
font-size:12px;
}
</style>
<body>
<div class="g-chart-container">
<h5 class="g-location"></h5>
<div class="g-chart"></div>
</div>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js" charset="utf-8"></script>
<script>
//JS to go here
//which location do I want to chart?
var myLocationName = "University Farm";
var margin = {top: 20, right: 10, bottom: 20, left: 130};
var width = 720 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
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 + ")");
//set domains once we load data
var xScale = d3.scale.linear()
.range([0,width]);
//ordinal scale - y0 is just a naming convention
var y0 = d3.scale.ordinal()
.rangeBands([height, 0], 0.2);
var yAxis = d3.svg.axis()
.scale(y0)
.tickSize(-width)
.tickPadding(13)
.orient("left");
var xAxis = d3.svg.axis()
.scale(xScale)
.tickSize(height)
.orient("top");
d3.tsv("https://raw.githubusercontent.com/thisismetis/nyc16_dataviz3/master/class3/barley.tsv?token=AC7uVd2ad4nXsDk5GMy0h3eOfpTA9LVLks5Wt2STwA%3D%3D", ready);
function ready(err, data) {
if (err) throw "error loading data";
//format data
data.forEach(function(d) {
d.year = +d.year;
d.yield = +d.yield;
});
// an array for just the location I want
var myLocationData = data.filter(function(d) {
return d.site === myLocationName;
});
//tricky, but insert hierarchy into our data. we'll go over this.
var yieldsByVariety = d3.nest()
.key(function(d) { return d.variety; })
.entries(myLocationData);
//add a flag for each variety to see whether it increased
yieldsByVariety.forEach(function(d) {
d.increasing = (d.values[0].yield > d.values[1].yield);
});
//make a headline
d3.select(".g-location").text(myLocationName);
//set domains
var maxYield = d3.max(data, function(d) { return d.yield; });
xScale.domain([0, maxYield ]);
y0.domain(d3.set(data.map(function(d) { return d.variety; })).values());
//draw your axes
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
//data join -- draw groups first
var varietyGroup = svg.selectAll(".g-variety-group")
.data(yieldsByVariety)
.enter()
.append("g")
.attr("class", function(d) { return "g-variety-group " + (d.increasing ? "g-increasing" : "g-decreasing"); })
.attr("transform", function(d) {
return "translate(0," + (y0(d.key) + y0.rangeBand()/2) + ")";
});
varietyGroup.append("line")
.attr("x1", function(d) { return xScale(d.values[0].yield); })
.attr("x2", function(d) { return xScale(d.values[1].yield); });
varietyGroup.append("circle")
.attr("class", "g-1931-yield")
.attr("r", 2)
.attr("cx", function(d) { return xScale(d.values[0].yield); });
varietyGroup.append("circle")
.attr("r", 4)
.attr("cx", function(d) { return xScale(d.values[1].yield); });
}
</script>
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