Drawing histogram using D3 in Angular2
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import { Component, OnInit, ElementRef } from '@angular/core'; | |
import { select } from 'd3-selection'; | |
import { scaleLinear } from 'd3-scale'; | |
import { range, histogram, max } from 'd3-array'; | |
import { format } from 'd3-format'; | |
import { randomBates } from 'd3-random'; | |
import { axisBottom } from 'd3-axis'; | |
@Component({ | |
selector:'histogram', | |
template:'<h1>Hello histogram</h1>\ | |
<svg id="hist" width="960" height="500"></svg>' | |
}) | |
export class HistogramComponent implements OnInit { | |
el: HTMLElement; | |
constructor(private elementRef: ElementRef){ | |
this.el = elementRef.nativeElement; | |
} | |
ngOnInit(): void { | |
this.drawHistogram(); | |
} | |
drawHistogram(){ | |
let data = range(1000).map(randomBates(10)); | |
let formatCount = format(",.0f"); | |
let hist = select(this.el).select('#hist'); | |
let margin = {top: 10, right: 30, bottom: 30, left: 30}; | |
let width = +hist.attr("width") - margin.left - margin.right; | |
let height = +hist.attr("height") - margin.top - margin.bottom; | |
let g = hist | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
let x = scaleLinear<number>() | |
.rangeRound([0, width]); | |
let generator = histogram<number>() | |
.domain(d => x.domain()) | |
.thresholds(x.ticks(20)); | |
let bins = generator(data); | |
let y = scaleLinear<number>() | |
.domain([0, max(bins, d => { return d.length; })]) | |
.range([height, 0]); | |
let bar = g.selectAll(".bar") | |
.data(bins) | |
.enter().append("g") | |
.attr("class", "bar") | |
.attr("transform", d => { | |
return "translate(" + x(d.x0) + "," + y(d.length) + ")"; | |
}); | |
let barWidth = x(bins[0].x1) - x(bins[0].x0) - 1; | |
bar.append("rect") | |
.attr("x", 1) | |
.attr("width", barWidth) | |
.attr("height", d => { return height - y(d.length); }); | |
let textLoc = (x(bins[0].x1) - x(bins[0].x0)) / 2; | |
bar.append("text") | |
.attr("dy", ".75em") | |
.attr("y", 6) | |
.attr("x", textLoc) | |
.attr("text-anchor", "middle") | |
.text(d => { return formatCount(d.length); }); | |
g.append("g") | |
.attr("class", "axis axis--x") | |
.attr("transform", "translate(0," + height + ")") | |
.call(axisBottom(x)); | |
} | |
} |
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.bar rect { | |
fill: steelblue; | |
} | |
.bar text { | |
fill: #fff; | |
font: 10px sans-serif; | |
} |
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What version of d3 did you use for it ? I tried using v3 and v4 but both threw same error about histogram expecting 0-2 arguments but got only one