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Add Project Aggregate Charts #132

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Feb 8, 2024
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227 changes: 227 additions & 0 deletions assets/js/components/pie-chart.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,227 @@
import {Chart, registerables} from 'https://cdn.jsdelivr.net/npm/[email protected]/+esm'
import Color from "https://colorjs.io/dist/color.js";

Chart.register(...registerables);

const getOrCreateLegendList = (chart, id) => {
const legendContainer = document.getElementById(id);
let listContainer = legendContainer.querySelector('ul');

if (!listContainer) {
listContainer = document.createElement('ul');
listContainer.style.display = 'flex';
listContainer.style.flexDirection = 'column';
listContainer.style.margin = 0;
listContainer.style.padding = 0;
listContainer.style.height = `${chart.canvas.height}px`;
listContainer.style.overflowY = 'auto';

legendContainer.appendChild(listContainer);
}

return listContainer;
};

/**
* Returns a hash code from a string
* @param {String} str The string to hash.
* @return {Number} A 32bit integer
* @see http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
*/
function hashCode(str) {
let hash = 0;
for (let i = 0, len = str.length; i < len; i++) {
let chr = str.charCodeAt(i);
hash = (hash << 5) - hash + chr;
hash |= 0; // Convert to 32bit integer
}
return hash;
}

const getColor = (context) => {

const colors = [
"#37a2eb",
"#ff6384",
"#ff9e40",
"#9966ff",
"#ffcd56",
"#4dbd74"
]

let hash = hashCode(context) ** 2 // Make sure its positive

let color = colors[hash % (colors.length - 1)]

let colorObj = new Color(color).to("lch");

// Manipulate the color based on the hash
colorObj = colorObj.lighten((hash % 19) / 100)
colorObj = colorObj.darken((hash % 23) / 100)

return colorObj.to("srgb").toString();
}

const htmlLegendPlugin = {
id: 'htmlLegend',
afterUpdate(chart, args, options) {
const ul = getOrCreateLegendList(chart, options.containerID);

// Remove old legend items
while (ul.firstChild) {
ul.firstChild.remove();
}

// Reuse the built-in legendItems generator
const items = chart.options.plugins.legend.labels.generateLabels(chart);

items.forEach(item => {
const li = document.createElement('li');
li.style.alignItems = 'center';
li.style.cursor = 'pointer';
li.style.display = 'flex';
li.style.flexDirection = 'row';
li.style.marginLeft = '10px';
li.style.paddingBottom = '2px'

li.onclick = () => {

if(options.onClick) {
options.onClick({label: item.text, value: null})
} else {
const {type} = chart.config;
if (type === 'pie' || type === 'doughnut') {
// Pie and doughnut charts only have a single dataset and visibility is per item
chart.toggleDataVisibility(item.index);
} else {
chart.setDatasetVisibility(item.datasetIndex, !chart.isDatasetVisible(item.datasetIndex));
}
chart.update();
}
};

// Color box
const boxSpan = document.createElement('span');
boxSpan.style.background = item.fillStyle;
boxSpan.style.borderColor = item.strokeStyle;
boxSpan.style.borderWidth = item.lineWidth + 'px';
boxSpan.style.display = 'inline-block';
boxSpan.style.flexShrink = 0;
boxSpan.style.height = '20px';
boxSpan.style.marginRight = '10px';
boxSpan.style.width = '20px';

// Text
const textContainer = document.createElement('p');
textContainer.style.color = "white";
textContainer.style.margin = 0;
textContainer.style.padding = 0;
textContainer.style.fontSize = ".8rem"
textContainer.style.textDecoration = item.hidden ? 'line-through' : '';

const text = document.createTextNode(item.text);
textContainer.appendChild(text);

li.appendChild(boxSpan);
li.appendChild(textContainer);
ul.appendChild(li);

ul.style.height = `${chart.canvas.style.height}`;
});
}
};

export class PieChart {
constructor(id, dataGetter, label, onClick = null) {
this.id = id
this.dataGetter = dataGetter
this.label = label
this.onClick = onClick
this.initialize()
}

async initialize() {
this.data = await this.dataGetter()
this.createHtmlElements()
this.createGraph()
}

update = async () => {
this.data = await this.dataGetter()
this.chart.data.labels = this.data['labels']
this.chart.data.datasets[0].data = this.data['data']
this.chart.update()
}

createHtmlElements() {

let parent = document.getElementById(this.id);
parent.className = 'row gx-0';

this.canvasContainer = document.createElement('div');
this.canvasContainer.className = "col-8"

this.canvas = document.createElement('canvas');
this.canvas.id = `canvas-${this.id}`;

this.legend = document.createElement('div');
this.legend.id = `legend-${this.id}`;
this.legend.className = "col-4"

// Empty the children out of the parent element
while (parent.firstChild) {
parent.removeChild(parent.firstChild);
}

this.canvasContainer.appendChild(this.canvas);
parent.appendChild(this.canvasContainer);
parent.appendChild(this.legend);
}

async createGraph() {
this.chart = new Chart(this.canvas, {
type: 'pie',
data: {
labels: this.data['labels'],
datasets: [{
label: this.label,
data: this.data['data'],
borderWidth: 1,
backgroundColor: this.data['labels'].map(getColor),
}]
},
options: {
responsive: true,
plugins: {
htmlLegend: {
// ID of the container to put the legend in
containerID: `legend-${this.id}`,
onClick: this.onClick
},
legend: {
display: false
}
}
},
plugins: [htmlLegendPlugin],
});

// Add a click event to the chart
if(this.onClick) {
this.canvas.onclick = this.onGraphClick.bind(this)
}
}

async onGraphClick(e) {
const points = this.chart.getElementsAtEventForMode(e, 'nearest', { intersect: true }, true);
if (points.length) {
const firstPoint = points[0];
const label = this.chart.data.labels[firstPoint.index];
const value = this.chart.data.datasets[firstPoint.datasetIndex].data[firstPoint.index];

console.log({label: label, value: value})

this.onClick({label: label, value: value})
}
}
}
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