Line Chart Boundaries

const data = { labels: generateLabels(), datasets: [ { label: 'Dataset', data: generateData(), borderColor: Utils.CHART_COLORS.red, backgroundColor: Utils.transparentize(Utils.CHART_COLORS.red), fill: false } ] };

const config = { type: 'line', data: data, options: { plugins: { filler: { propagate: false, }, title: { display: true, text: (ctx) => 'Fill: ' + ctx.chart.data.datasets[0].fill } }, interaction: { intersect: false, } }, };

const inputs = { min: -100, max: 100, count: 8, decimals: 2, continuity: 1 }; const generateLabels = () => { return Utils.months({count: inputs.count}); }; const generateData = () => (Utils.numbers(inputs));

let smooth = false; const actions = [ { name: 'Fill: false (default)', handler: (chart) => { chart.data.datasets.forEach(dataset => { dataset.fill = false; }); chart.update(); } }, { name: 'Fill: origin', handler: (chart) => { chart.data.datasets.forEach(dataset => { dataset.fill = 'origin'; }); chart.update(); } }, { name: 'Fill: start', handler: (chart) => { chart.data.datasets.forEach(dataset => { dataset.fill = 'start'; }); chart.update(); } }, { name: 'Fill: end', handler: (chart) => { chart.data.datasets.forEach(dataset => { dataset.fill = 'end'; }); chart.update(); } }, { name: 'Randomize', handler(chart) { chart.data.datasets.forEach(dataset => { dataset.data = generateData(); }); chart.update(); } }, { name: 'Smooth', handler(chart) { smooth = !smooth; chart.options.elements.line.tension = smooth ? 0.4 : 0; chart.update(); } } ];

Docs

• Area
  • Filling modes
    • Boundary: 'start', 'end', 'origin'
• Line
• Data structures (labels)