import * as d3 from "d3";
import component from "../component.js";
import palette from "../palette.js";
import dataTransform from "../dataTransform.js";
import { generateLayout } from "../utils.js";
/**
* Donut Chart (aka: Doughnut Chart; Pie Chart)
*
* @module
* @see http://datavizproject.com/data-type/donut-chart/
* @see https://www.atlassian.com/data/charts/pie-chart-complete-guide
*/
export default function() {
/* Default Properties */
let classed = "donutChart";
let width = 700;
let height = 400;
let margin = { top: 40, right: 40, bottom: 40, left: 40 };
let colors = palette.categorical(3);
let transition = { ease: d3.easeLinear, duration: 100 };
let dispatch = d3.dispatch("customValueMouseOver", "customValueMouseOut", "customValueClick", "customSeriesMouseOver", "customSeriesMouseOut", "customSeriesClick");
/* Other Customisation Options */
let title = null;
let subTitle = null;
let legendTitle = "Key";
let opacity = 1;
let showLegend = false;
let showAxis = true;
let startAngle = 0;
let endAngle = 360;
/**
* Constructor
*
* @constructor
* @alias donutChart
* @param {d3.selection} selection - The chart holder D3 selection.
*/
function my(selection) {
// Create SVG element (if it does not exist already)
const svg = (function(selection) {
const el = selection._groups[0][0];
if (!!el.ownerSVGElement || el.tagName === "svg") {
return selection;
} else {
let svgSelection = selection.selectAll("svg").data((d) => [d]);
return svgSelection.enter().append("svg").merge(svgSelection);
}
})(selection);
selection.each(function(data) {
// Set up margins and dimensions for the chart
const legendW = showLegend ? 120 : 0;
const legendH = Math.max(height / 2.5, 100);
const legendPad = showLegend ? 15 : 0;
const titleH = title ? 40 : 0;
const chartW = Math.max((width - margin.left - legendPad - legendW - margin.right), 100);
const chartH = Math.max((height - margin.top - titleH - margin.bottom), 100);
const { coordinates, cellRadius: radius } = generateLayout(data.length, chartW, chartH);
const innerRadius = radius / 2;
const { columnKeys, valueExtent } = dataTransform(data).summary();
const xScale = d3.scaleBand()
.domain(columnKeys)
.range([innerRadius, radius]);
const yScale = d3.scaleLinear()
.domain(valueExtent)
.range([startAngle, endAngle]);
let colorScale = d3.scaleOrdinal()
.domain(columnKeys)
.range(colors);
// Add Title, Chart and Legend main layer groups
const mainLayers = ["title", "chart", "legend"];
svg.classed("d3ez", true)
.attr("width", width)
.attr("height", height)
.selectAll("g")
.data(mainLayers)
.enter()
.append("g")
.attr("class", (d) => d);
const titleSelect = svg.select(".title");
const chartSelect = svg.select(".chart");
const legendSelect = svg.select(".legend");
// Update the chart dimensions and layer groups
const chartLayers = ["seriesGroup", "axis"];
chartSelect.classed(classed, true)
.attr("width", chartW)
.attr("height", chartH)
.attr("transform", `translate(${margin.left},${margin.top + titleH})`)
.selectAll("g")
.data(chartLayers)
.enter()
.append("g")
.attr("class", (d) => d);
// Donut Slice Component
const componentDonut = component.donut()
.xScale(xScale)
.yScale(yScale)
.colorScale(colorScale)
.opacity(opacity)
.dispatch(dispatch)
.transition(transition);
// Donut Label Component
const componentDonutLabels = component.donutLabels()
.xScale(xScale)
.yScale(yScale)
.transition(transition);
// Series Group
const series = chartSelect.select(".seriesGroup")
.selectAll(".series")
.data(data);
series.enter()
.append("g")
.classed("series", true)
.merge(series)
.attr("data-name", (d) => d.key)
.attr("transform", (d, i) => `translate(${coordinates[i].x},${coordinates[i].y})`)
.call(componentDonut);
series.exit()
.remove();
// Axis Labels
if (showAxis) {
const seriesAxis = chartSelect.select(".axis")
.selectAll(".seriesAxis")
.data(data);
seriesAxis.enter()
.append("g")
.classed("seriesAxis", true)
.merge(seriesAxis)
.attr("transform", (d, i) => `translate(${coordinates[i].x},${coordinates[i].y})`)
.call(componentDonutLabels);
seriesAxis.exit()
.remove();
} else {
chartSelect.selectAll(".axis").selectAll('*').remove();
}
// Title
if (title) {
const componentTitle = component.title()
.mainText(title)
.subText(subTitle);
titleSelect.attr("transform", `translate(${width / 2},${margin.top})`)
.call(componentTitle);
} else {
titleSelect.selectAll("*").remove();
}
// Legend
if (showLegend) {
const componentLegend = component.legend()
.colorScale(colorScale)
.height(legendH)
.width(legendW)
.itemType("rect")
.opacity(opacity);
legendSelect.attr("transform", `translate(${margin.left + chartW + legendPad},${margin.top})`)
.call(componentLegend);
} else {
legendSelect.selectAll("*").remove();
}
});
}
/**
* Width Getter / Setter
*
* @param {number} _v - Width in px.
* @returns {*}
*/
my.width = function(_v) {
if (!arguments.length) return width;
width = _v;
return this;
};
/**
* Height Getter / Setter
*
* @param {number} _v - Height in px.
* @returns {*}
*/
my.height = function(_v) {
if (!arguments.length) return height;
height = _v;
return this;
};
/**
* Margin Getter / Setter
*
* @param {number} _v - Margin in px.
* @returns {*}
*/
my.margin = function(_v) {
if (!arguments.length) return margin;
margin = _v;
return this;
};
/**
* Colors Getter / Setter
*
* @param {Array} _v - Array of colours used by color scale.
* @returns {*}
*/
my.colors = function(_v) {
if (!arguments.length) return colors;
colors = _v;
return this;
};
/**
* Show Legend Getter / Setter
*
* @param {Boolean} _v - Show legend true / false.
* @returns {*}
*/
my.showLegend = function(_v) {
if (!arguments.length) return showLegend;
showLegend = _v;
return this;
};
/**
* Show Axis Getter / Setter
*
* @param {Boolean} _v - Show axis true / false.
* @returns {*}
*/
my.showAxis = function(_v) {
if (!arguments.length) return showAxis;
showAxis = _v;
return this;
};
/**
* Title Getter / Setter
*
* @param {string} _v - Title text.
* @returns {*}
*/
my.title = function(_v) {
if (!arguments.length) return title;
title = _v;
return this;
};
/**
* SubTitle Getter / Setter
*
* @param {string} _v - SubTitle text.
* @returns {*}
*/
my.subTitle = function(_v) {
if (!arguments.length) return subTitle;
subTitle = _v;
return this;
};
/**
* Opacity Getter / Setter
*
* @param {Number} _v - Opacity level.
* @returns {*}
*/
my.opacity = function(_v) {
if (!arguments.length) return opacity;
opacity = _v;
return this;
};
/**
* Transition Getter / Setter
*
* @param {d3.transition} _v - D3 transition style.
* @returns {*}
*/
my.transition = function(_v) {
if (!arguments.length) return transition;
transition = _v;
return this;
};
/**
* Dispatch Getter / Setter
*
* @param {d3.dispatch} _v - Dispatch event handler.
* @returns {*}
*/
my.dispatch = function(_v) {
if (!arguments.length) return dispatch();
dispatch = _v;
return this;
};
/**
* On Event Getter
*
* @returns {*}
*/
my.on = function() {
let value = dispatch.on.apply(dispatch, arguments);
return value === dispatch ? my : value;
};
return my;
}