D3统计图动画

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JavaScript

const dataset = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1];

// let colors = ['#8dd3c7', '#ffffb3', '#bebada', '#fb8072', '#80b1d3', '#fdb462', '#b3de69', '#fccde5', '#d9d9d9', '#bc80bd'];
// let colors = ['#67001f', '#b2182b', '#d6604d', '#f4a582', '#fddbc7', '#e0e0e0', '#bababa', '#878787', '#4d4d4d', '#1a1a1a'];
const colors = ['#9e0142', '#d53e4f', '#f46d43', '#fdae61', '#fee08b', '#e6f598', '#abdda4', '#66c2a5', '#3288bd', '#5e4fa2'];

const width = document.querySelector('.chart-wrapper').offsetWidth;
const height = document.querySelector('.chart-wrapper').offsetHeight;
const minOfWH = Math.min(width, height) / 2;
const initialAnimDelay = 300;
const arcAnimDelay = 150;
const arcAnimDur = 3000;
const secDur = 1000;
const secIndividualdelay = 150;

let radius;

// calculate minimum of width and height to set chart radius
if (minOfWH > 200) {
  radius = 200;
} else {
  radius = minOfWH;
}

// append svg
let svg = d3.select('.chart-wrapper').append('svg').
attr({
  'width': width,
  'height': height,
  'class': 'pieChart' }).

append('g');

svg.attr({
  'transform': `translate(${width / 2}, ${height / 2})` });

// for drawing slices
let arc = d3.svg.arc().
outerRadius(radius * 0.6).
innerRadius(radius * 0.45);

// for labels and polylines
let outerArc = d3.svg.arc().
innerRadius(radius * 0.85).
outerRadius(radius * 0.85);

// d3 color generator
// let c10 = d3.scale.category10();

let pie = d3.layout.pie().
value(d => d);

let draw = function () {

svg.append("g").attr("class", "lines");
  svg.append("g").attr("class", "slices");
  svg.append("g").attr("class", "labels");

// define slice
  let slice = svg.select('.slices').
  datum(dataset).
  selectAll('path').
  data(pie);
  slice.
  enter().append('path').
  attr({
    'fill': (d, i) => colors[i],
    'd': arc,
    'stroke-width': '25px',
    'transform': (d, i) => 'rotate(-180, 0, 0)' }).

style('opacity', 0).
  transition().
  delay((d, i) => i * arcAnimDelay + initialAnimDelay).
  duration(arcAnimDur).
  ease('elastic').
  style('opacity', 1).
  attr('transform', 'rotate(0,0,0)');

slice.transition().
  delay((d, i) => arcAnimDur + i * secIndividualdelay).
  duration(secDur).
  attr('stroke-width', '5px');

let midAngle = d => d.startAngle + (d.endAngle - d.startAngle) / 2;

let text = svg.select(".labels").selectAll("text").
  data(pie(dataset));

text.enter().
  append('text').
  attr('dy', '0.35em').
  style("opacity", 0).
  style('fill', (d, i) => colors[i]).
  text((d, i) => colors[i]).
  attr('transform', d => {
    // calculate outerArc centroid for 'this' slice
    let pos = outerArc.centroid(d);
    // define left and right alignment of text labels 							
    pos[0] = radius * (midAngle(d) < Math.PI ? 1 : -1);
    return `translate(${pos})`;
  }).
  style('text-anchor', d => midAngle(d) < Math.PI ? "start" : "end").
  transition().
  delay((d, i) => arcAnimDur + i * secIndividualdelay).
  duration(secDur).
  style('opacity', 1);

let polyline = svg.select(".lines").selectAll("polyline").
  data(pie(dataset));

polyline.enter().
  append("polyline").
  style("opacity", 0.5).
  attr('points', d => {
    let pos = outerArc.centroid(d);
    pos[0] = radius * 0.95 * (midAngle(d) < Math.PI ? 1 : -1);
    return [arc.centroid(d), arc.centroid(d), arc.centroid(d)];
  }).
  transition().
  duration(secDur).
  delay((d, i) => arcAnimDur + i * secIndividualdelay).
  attr('points', d => {
    let pos = outerArc.centroid(d);
    pos[0] = radius * 0.95 * (midAngle(d) < Math.PI ? 1 : -1);
    return [arc.centroid(d), outerArc.centroid(d), pos];
  });
};

draw();

let button = document.querySelector('button');

let replay = () => {

d3.selectAll('.slices').transition().ease('back').duration(500).delay(0).style('opacity', 0).attr('transform', 'translate(0, 250)').remove();
  d3.selectAll('.lines').transition().ease('back').duration(500).delay(100).style('opacity', 0).attr('transform', 'translate(0, 250)').remove();
  d3.selectAll('.labels').transition().ease('back').duration(500).delay(200).style('opacity', 0).attr('transform', 'translate(0, 250)').remove();

setTimeout(draw, 800);

};

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