25 lines
619 B
TypeScript
25 lines
619 B
TypeScript
import { Plugin } from "chart.js";
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export const chartVLine = (vLineColor: string) =>
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({
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id: "vLine",
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beforeDraw(chart, args, options) {
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if (chart.tooltip?._active?.length) {
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const ctx = chart.ctx;
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const xs = chart.tooltip._active.map((a) => a.element.x);
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const x = xs.reduce((a, b) => a + b, 0) / xs.length;
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const topY = chart.scales.y.top;
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const bottomY = chart.scales.y.bottom;
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ctx.save();
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ctx.beginPath();
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ctx.moveTo(x, bottomY);
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ctx.lineTo(x, topY);
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ctx.lineWidth = 1;
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ctx.strokeStyle = vLineColor;
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ctx.stroke();
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ctx.restore();
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}
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},
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}) as Plugin;
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