cc-backend/web/frontend/src/plots/Pie.svelte

<script>
    // import { getContext } from 'svelte'
    import { Pie } from 'svelte-chartjs';
    import {
        Chart as ChartJS,
        Title,
        Tooltip,
        Legend,
        ArcElement,
        CategoryScale
    } from 'chart.js';

    ChartJS.register(
        Title,
        Tooltip,
        Legend,
        ArcElement,
        CategoryScale
    );

    export let size
    export let sliceLabel
    export let quantities
    export let entities
    export let displayLegend = false

    // http://tsitsul.in/blog/coloropt/ : 12 colors normal
    const colors = [
        'rgb(235,172,35)',
        'rgb(184,0,88)',
        'rgb(0,140,249)',
        'rgb(0,110,0)',
        'rgb(0,187,173)',
        'rgb(209,99,230)',
        'rgb(178,69,2)',
        'rgb(255,146,135)',
        'rgb(89,84,214)',
        'rgb(0,198,248)',
        'rgb(135,133,0)',
        'rgb(0,167,108)',
        'rgb(189,189,189)'
    ]

    const data = {
        labels: entities,
        datasets: [
            {
                label: sliceLabel,
                data: quantities,
                fill: 1,
                backgroundColor: colors.slice(0, quantities.length),            
            }
        ]
    }

    const options = { 
        maintainAspectRatio: false,
        plugins: {
            legend: {
                display: displayLegend
            }
        }
    }

</script>

<div class="chart-container" style="--container-width: {size}; --container-height: {size}">
    <Pie {data} {options}/>
</div>

<style>
    .chart-container {
        position: relative;
        margin: auto;
        height: var(--container-height);
        width: var(--container-width);
    }
</style>