Add helper class to manage a set of stacked bars
It also automatically generates and manages the legend.
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2 changed files with 55 additions and 7 deletions
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@ -15,28 +15,30 @@ class ChartStackedBar {
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* @type {Object[]}
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*/
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this.categories = [
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// { colour: "hsl(46, 80%, 50%)", weight: 4 }
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// { name: "Some category name", colour: "hsl(46, 80%, 50%)", weight: 4 }
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// ....
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];
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this.auto_render = true;
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this.#svg = SVG().size("100%", "100%");
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this.svg = SVG().size("100%", "100%");
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this.sym_bar = Symbol();
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}
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/**
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* Adds a new category to the bar.
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* @param {string} colour The colour to assign to the category.
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* @param {number} weight The weighting value to assign to the category.
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* @param {string} name A display name for the category.
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* @param {string} colour The colour to assign to the category.
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* @param {number} weight The weighting value to assign to the category.
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* @returns {Symbol} A unique id for the new category.
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*/
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category_add(colour, weight) {
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category_add(name, colour, weight) {
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const id = Symbol();
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this.categories.push({
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id,
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name,
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colour,
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weight,
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[this.sym_bar]: null
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@ -61,7 +63,7 @@ class ChartStackedBar {
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for(const cat of this.categories) {
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const percent_this = this.#weight_percent(cat.weight);
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if(cat[this.sym_bar] === null) {
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cat[this.sym_bar] = this.#svg.rect("100%", "10%")
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cat[this.sym_bar] = this.svg.rect("100%", "10%")
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.fill(cat.colour)
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}
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cat[this.sym_bar].height = `${percent_this}%`;
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46
src/static/js/ui/charts/ChartStackedBarSet.mjs
Normal file
46
src/static/js/ui/charts/ChartStackedBarSet.mjs
Normal file
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@ -0,0 +1,46 @@
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"use strict";
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import Emel from 'emel';
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class ChartStackedBarSet {
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constructor() {
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this.emel = new Emel().emel;
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this.el = this.emel(`div[class="stacked-bar-set"]>div[class=legend]+div[class=bars]`);
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this.bars = [];
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}
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add_bar(i, bar) {
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this.bars.splice(i, 0, bar);
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this.#update_cats();
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}
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#update_cats() {
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const el_legend = this.el.querySelector(`.legend`);
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const els_legend_items = [...el_legend.querySelectorAll(`.legend-item`)];
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// map → flatten → uniq
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let cats = this.bars.map(bar => bar.categories).flat()
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.filter((cat, i) => cats.find(scat => cat.name === scat.name) === i);
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for(const cat of cats) {
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const el_legend_item = els_legend_items.find(el => el.dataset.name === cat.name);
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if(typeof el_legend_item === "undefined") {
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// Nope, didn't find it - create it
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el_legend.appendChild(this.#make_legend_item(cat.colour, cat.name));
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}
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else {
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// Yep, we found it - update the names
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el_legend_item.querySelector(".legend-item-spot").style.background = cat.colour;
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el_legend_item.querySelector(".legend-item-text").replaceChildren(document.createTextNode(cat.name));
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}
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}
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}
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#make_legend_item(colour, name) {
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return this.emel(`span[class="legend-item"]>span[style="background: ${colour};" class="legend-item-spot"]+span[class="legend-item-text"]{${name}}`);
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}
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}
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export default ChartStackedBarSet;
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