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@jwilber
Created December 27, 2018 03:13
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basic reusable bar chart
license: mit
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.js"></script>
<style>
svg {
border: 1px dotted red;
}
</style>
</head>
<body>
<div id="runningHistory"></div>
<div id="viz2"></div>
</body>
<script>
var milesRun = [2, 5, 4, 1, 2, 6, 5];
var highTemperatures = [77, 71, 82, 87, 84, 78, 80, 84, 86, 72, 71, 68, 75, 73, 80, 85, 86, 80];
function drawChart(dom, data, options) {
const width = options.width || 500;
const height = options.height || 300;
const barPadding = options.barPadding || 1;
const fillColor = options.fillColor || 'steelblue';
var barSpacing = height / data.length;
var barHeight = barSpacing - barPadding;
var maxValue = d3.max(data);
var widthScale = width / maxValue;
d3.select(dom).append('svg')
.attr('width', width)
.attr('height', height)
.selectAll('rect')
.data(data)
.enter()
.append('rect')
.attr('y', (d,i) => i * barSpacing)
.attr('height', barHeight)
.attr('x', 0)
.attr('width', d => d*widthScale)
.attr('fill', fillColor);
}
var runningOptions = {barPadding: 2, fillColor: 'coral'};
drawChart('#runningHistory', milesRun, runningOptions);
const weaOps = {barPadding: 10, fillColor: 'pink',
width: 200}
drawChart('#viz2', highTemperatures, weaOps)
</script>
</html>
function randomData(numPoints) {
var data = [];
random = function() {return Math.floor(Math.random() * 100);};
for (i = 0; i < numPoints; i++) {
data.push({
x: random(),
y: random(),
z: random()
});
}
return data;
}
function scatterPlot() {
var margin = {top: 10, right: 25, bottom: 25, left: 40},
width = 600,
height = 400,
xValue = function(d) { return d[0]; },
yValue = function(d) { return d[1]; },
sizeValue = function(d) { return d[2]; },
xScale = d3.scaleLinear(),
yScale = d3.scaleLinear(),
sizeScale = d3.scaleSqrt(),
xAxis = d3.axisBottom().tickSize(6,1);
yAxis = d3.axisLeft().tickSize(6, 1);
function chart(selection) {
selection.each(function(data) {
// Convert data to standard representation greedily;
// this is needed for nondeterministic accessors.
data = data.map(function(d, i) {
return [xValue.call(data, d, i),
yValue.call(data, d, i),
sizeValue.call(data, d, i)];
});
// Update the x-scale.
xScale
.domain(d3.extent(data, function(d) { return d[0]; }))
.range([0, width - margin.left - margin.right]);
// Update the y-scale.
yScale
.domain([0, d3.max(data, function(d) { return d[1]; })])
.range([height - margin.top - margin.bottom, 0]);
// Update the size-scale.
sizeScale
.domain([d3.min(data, function(d) { return d[2]; }),
d3.max(data, function(d) { return d[2]; })])
.range([2,8]);
// Select the svg element, if it exists.
var svg = d3.select(this).selectAll("svg").data([data]);
// Otherwise, create the skeletal chart.
var gEnter = svg.enter().append("svg").append("g");
gEnter.append("g").attr("class", "points");
gEnter.append("g").attr("class", "x axis");
gEnter.append("g").attr("class", "y axis");
// Update the outer dimensions.
svg .attr("width", width)
.attr("height", height);
// Update the inner dimensions.
var g = svg.select("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// Update the points
g.select("g.points")
.selectAll("circles.point")
.data(data)
.enter()
.append("circle")
.attr("class", "point")
.attr("r", function(d) { return sizeScale(d[2]); })
.attr("transform", function(d) {
return "translate(" + xScale(d[0]) + "," + yScale(d[1]) + ")";
});
// Update the x-axis.
g.select(".x.axis")
.attr("transform", "translate(0," + yScale.range()[0] + ")")
.call(xAxis);
// Update the y-axis.
g.select(".y.axis")
.attr("transform", "translate(0," + xScale.range()[0] + ")")
.call(yAxis);
});
}
// The x-accessor for the path generator; xScale ∘ xValue.
function X(d) {
return xScale(d[0]);
}
// The x-accessor for the path generator; yScale ∘ yValue.
function Y(d) {
return yScale(d[1]);
}
function size(d) {
return sizeScale(d[2]);
}
chart.margin = function(_) {
if (!arguments.length) return margin;
margin = _;
return chart;
};
chart.width = function(_) {
if (!arguments.length) return width;
width = _;
return chart;
};
chart.height = function(_) {
if (!arguments.length) return height;
height = _;
return chart;
};
chart.x = function(_) {
if (!arguments.length) return xValue;
xValue = _;
return chart;
};
chart.y = function(_) {
if (!arguments.length) return yValue;
yValue = _;
return chart;
};
chart.size = function(_) {
if (!arguments.length) return sizeValue;
sizeValue = _;
return chart;
};
return chart;
}
var chart = scatterPlot()
.x( function(d) { return +d.x; } )
.y( function(d) { return +d.y; } )
.size( function(d) { return +d.z; } )
.height(250);
// Bind the data to the chart to the #viz elements
chart1 = d3.select('#viz1').datum(randomData(50)).call(chart);
chart2 = d3.select('#viz2').datum(randomData(50)).call(chart);
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