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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import type { Plugin } from 'chart.js';
export const chartVLine = (vLineColor: string) => ({
id: 'vLine',
beforeDraw(chart, args, options) {
const tooltip = chart.tooltip as any;
if (tooltip?._active?.length) {
const ctx = chart.ctx;
const xs = tooltip._active.map((a: any) => a.element.x) as number[];
const x = xs.reduce((a, b) => a + b, 0) / xs.length;
const topY = chart.scales.y.top;
const bottomY = chart.scales.y.bottom;
ctx.save();
ctx.beginPath();
ctx.moveTo(x, bottomY);
ctx.lineTo(x, topY);
ctx.lineWidth = 1;
ctx.strokeStyle = vLineColor;
ctx.stroke();
ctx.restore();
}
},
}) as Plugin;
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