Feature/add vertical hover line to line chart component (#963)
* Add vertical hover line * Improve tooltips of charts * Update changelogpull/973/head
Thomas Kaul
3 years ago
committed by
GitHub
parent
34d4212f55
commit
15dda886a0
@ -0,0 +1,83 @@
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import { Chart, TooltipPosition } from 'chart.js';
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import { getBackgroundColor, getTextColor } from './helper';
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export function getTooltipOptions(currency = '', locale = '') {
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return {
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backgroundColor: getBackgroundColor(),
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bodyColor: `rgb(${getTextColor()})`,
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borderWidth: 1,
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borderColor: `rgba(${getTextColor()}, 0.1)`,
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callbacks: {
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label: (context) => {
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let label = context.dataset.label || '';
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if (label) {
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label += ': ';
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}
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if (context.parsed.y !== null) {
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if (currency) {
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label += `${context.parsed.y.toLocaleString(locale, {
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maximumFractionDigits: 2,
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minimumFractionDigits: 2
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})} ${currency}`;
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} else {
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label += context.parsed.y.toFixed(2);
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}
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}
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return label;
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}
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},
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caretSize: 0,
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cornerRadius: 2,
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footerColor: `rgb(${getTextColor()})`,
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itemSort: (a, b) => {
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// Reverse order
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return b.datasetIndex - a.datasetIndex;
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},
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titleColor: `rgb(${getTextColor()})`,
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usePointStyle: true
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};
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}
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export function getTooltipPositionerMapTop(
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chart: Chart,
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position: TooltipPosition
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) {
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if (!position) {
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return false;
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}
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return {
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x: position.x,
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y: chart.chartArea.top
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};
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}
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export function getVerticalHoverLinePlugin(chartCanvas) {
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return {
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afterDatasetsDraw: (chart, x, options) => {
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const active = chart.getActiveElements();
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if (!active || active.length === 0) {
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return;
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}
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const color = options.color || `rgb(${getTextColor()})`;
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const width = options.width || 1;
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const {
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chartArea: { bottom, top }
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} = chart;
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const xValue = active[0].element.x;
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const context = chartCanvas.nativeElement.getContext('2d');
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context.lineWidth = width;
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context.strokeStyle = color;
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context.beginPath();
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context.moveTo(xValue, top);
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context.lineTo(xValue, bottom);
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context.stroke();
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},
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id: 'verticalHoverLine'
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};
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}
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