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Drawing histogram using D3 in Angular2
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));
}
}
.bar rect {
fill: steelblue;
}
.bar text {
fill: #fff;
font: 10px sans-serif;
}
@hoshank

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hoshank commented Feb 21, 2018

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

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