2016-08-19 21:03:27 -04:00
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import { category21 } from '../javascripts/modules/colors';
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import d3 from 'd3';
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2016-08-10 18:04:19 -04:00
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2016-08-19 21:03:27 -04:00
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require('./histogram.css');
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2016-08-10 18:04:19 -04:00
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function histogram(slice) {
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2016-08-19 21:03:27 -04:00
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const div = d3.select(slice.selector);
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2016-08-10 18:04:19 -04:00
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2016-08-19 21:03:27 -04:00
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const draw = function (data, numBins) {
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// Set Margins
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const margin = {
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top: 50,
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right: 10,
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bottom: 20,
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left: 50,
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2016-08-10 18:04:19 -04:00
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};
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2016-08-19 21:03:27 -04:00
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const navBarHeight = 36;
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const navBarBuffer = 10;
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const width = slice.width() - margin.left - margin.right;
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const height = slice.height() - margin.top - margin.bottom - navBarHeight - navBarBuffer;
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// Set Histogram objects
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const formatNumber = d3.format(',.0f');
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const formatTicks = d3.format(',.00f');
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const x = d3.scale.ordinal();
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const y = d3.scale.linear();
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const xAxis = d3.svg.axis()
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.scale(x)
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.orient('bottom')
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.ticks(numBins)
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.tickFormat(formatTicks);
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const yAxis = d3.svg.axis()
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.scale(y)
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.orient('left')
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.ticks(numBins);
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2016-08-19 21:03:27 -04:00
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// Calculate bins for the data
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const bins = d3.layout.histogram().bins(numBins)(data);
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// Set the x-values
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x.domain(bins.map((d) => d.x))
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.rangeRoundBands([0, width], 0.1);
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// Set the y-values
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y.domain([0, d3.max(bins, (d) => d.y)])
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.range([height, 0]);
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// Create the svg value with the bins
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const svg = div.selectAll('svg')
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.data([bins])
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.enter()
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.append('svg');
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// Make a rectangular background fill
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svg.append('rect')
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.attr('width', '100%')
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.attr('height', '100%')
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.attr('fill', '#f6f6f6');
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// Transform the svg to make space for the margins
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const gEnter = svg
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.append('g')
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.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
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// Add the bars and the x axis
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gEnter.append('g').attr('class', 'bars');
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gEnter.append('g').attr('class', 'x axis');
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// Add width and height to the svg
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svg.attr('width', slice.width())
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.attr('height', slice.height());
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// Create the bars in the svg
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const bar = svg.select('.bars').selectAll('.bar').data(bins);
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bar.enter().append('rect');
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bar.exit().remove();
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// Set the Height and Width for each bar
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bar.attr('width', x.rangeBand())
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.attr('x', (d) => x(d.x))
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.attr('y', (d) => y(d.y))
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.attr('height', (d) => y.range()[0] - y(d.y))
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.style('fill', (d) => category21(d.length))
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.order();
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// Find maximum length to position the ticks on top of the bar correctly
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const maxLength = d3.max(bins, (d) => d.length);
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function textAboveBar(d) {
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return d.length / maxLength < 0.1;
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}
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// Add a bar text to each bar in the histogram
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svg.selectAll('.bartext')
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.data(bins)
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.enter()
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.append('text')
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.attr('dy', '.75em')
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.attr('y', function (d) {
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let padding = 0.0;
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if (textAboveBar(d)) {
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padding = 12.0;
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} else {
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padding = -8.0;
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}
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return y(d.y) - padding;
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})
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.attr('x', (d) => x(d.x) + (x.rangeBand() / 2))
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.attr('text-anchor', 'middle')
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.attr('font-weight', 'bold')
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.attr('font-size', '15px')
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.text((d) => formatNumber(d.y))
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.attr('fill', (d) => textAboveBar(d) ? 'black' : 'white')
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.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
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// Update the x-axis
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svg.append('g')
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.attr('class', 'axis')
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.attr('transform', 'translate(' + margin.left + ',' + (height + margin.top) + ')')
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.text('values')
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.call(xAxis);
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// Update the Y Axis and add minor lines
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svg.append('g')
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.attr('class', 'axis')
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.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
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.text('count')
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.call(yAxis)
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.selectAll('g')
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.filter(function (d) { return d; })
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.classed('minor', true);
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};
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const render = function () {
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d3.json(slice.jsonEndpoint(), function (error, json) {
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if (error !== null) {
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slice.error(error.responseText, error);
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return;
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}
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const numBins = Number(json.form_data.link_length) || 10;
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div.selectAll('*').remove();
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draw(json.data, numBins);
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slice.done(json);
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});
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};
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2016-08-10 18:04:19 -04:00
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2016-08-19 21:03:27 -04:00
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return {
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render,
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resize: render,
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};
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2016-08-10 18:04:19 -04:00
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}
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module.exports = histogram;
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